WO2020080796A1

WO2020080796A1 - Cavity filter

Info

Publication number: WO2020080796A1
Application number: PCT/KR2019/013515
Authority: WO
Inventors: 김정회; 김상융
Original assignee: 주식회사 케이엠더블유
Priority date: 2018-10-15
Filing date: 2019-10-15
Publication date: 2020-04-23
Also published as: JP7146105B2; JP7430230B2; JP2022179527A; JP2022508748A

Abstract

The present invention relates to a cavity filter and, in particular, provides an advantage of preventing performance deterioration of an antenna device by efficiently absorbing an assembly tolerance which may occur due to assembly design and preventing an interruption of an electrical flow, by comprising: an RF signal connecting part provided to be spaced apart at a predetermined distance from an external member having an electrode pad formed on one surface thereof; a terminal part which electrically connects the electrode pad of the external member to the RF signal connecting part, while absorbing an assembly tolerance existing within the predetermined distance and simultaneously preventing an interruption of an electrical flow between the electrode pad and the RF signal connecting part; a dielectric body which is inserted into a terminal insertion hole so as to surround the outside of the terminal part; and an elastic member which has a portion of the edge supported by the dielectric body and which elastically supports the terminal part by means of an operation in which a hollow part is deformed in the vertical direction when an assembly force is transmitted to the terminal part supported to pass through the hollow part, wherein the terminal part comprises one terminal brought into contact with the electrode pad and the other terminal connected to the RF signal connecting part.

Description

Cavity filter

The present invention relates to a cavity filter (CAVITY FILTER), and more particularly, to a cavity filter for a Massive MIMO antenna with improved connector fastening structure between a filter and a printed circuit board in consideration of assembly and size.

The contents described in this section merely provide background information for this embodiment, and do not constitute a prior art.

MIMO (Multiple Input Multiple Output) technology is a technology that dramatically increases data transmission capacity by using multiple antennas. Transmitters transmit different data through each transmit antenna and receivers transmit data through appropriate signal processing. It is a spatial multiplexing technique. Accordingly, as the number of transmit / receive antennas is increased simultaneously, the channel capacity is increased to allow more data to be transmitted. For example, if the number of antennas is increased to 10, about 10 times the channel capacity is secured using the same frequency band compared to the current single antenna system.

Up to 8 antennas are used in 4G LTE-advanced, and products with 64 or 128 antennas are currently being developed in the pre-5G stage, and base station equipment with a much larger number of antennas is expected to be used in 5G. , This is called Massive MIMO technology. While current cell operation is 2-Dimension, 3D-Beamforming becomes possible when Massive MIMO technology is introduced, so Massive MIMO technology is also called FD-MIMO (Full Dimension).

In the Massive MIMO technology, as the number of antenna elements increases, the number of transceivers and filters accordingly increases. In addition, more than 200,000 base stations are installed nationwide as of 2014. That is, a cavity filter structure that minimizes mounting space and is easy to mount is required, and an RF signal line connection structure is required to provide the same filter characteristics even after individually tuned cavity filters are mounted on the antenna.

The RF filter having a cavity structure is provided with a resonator composed of a resonating rod, such as a conductor, inside a box structure formed of a metallic conductor, so that only an electromagnetic field having a natural frequency exists, so that only characteristic frequencies of ultra-high frequencies are passed by resonance. The bandpass filter having a cavity structure has a small insertion loss and is advantageous for high output, and thus is widely used as a filter for a mobile communication base station antenna.

An object of the present invention is to provide a cavity filter having a slimmer and more compact structure and an RF connector embedded in the thickness direction in the body.

In addition, an object of the present invention, a cavity filter having an assembly method capable of minimizing the accumulated amount of assembly tolerances generated when assembling a plurality of filters and an RF signal connection structure that is easy to mount and maintains the frequency characteristics of the filter uniformly In providing.

In addition, it is an object of the present invention, in the case of the separation type of the RF pin, to provide a cavity filter capable of preventing signal loss by adding side tension while allowing relative movement.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following descriptions.

An embodiment of the cavity filter according to the present invention for achieving the above object, an RF signal connection portion provided to be spaced a predetermined distance from the external member having an electrode pad on one surface, the electrode pad and the RF signal of the external member A terminal part electrically connected to a terminal part that absorbs assembly tolerances existing at the predetermined distance and prevents electric flow from being disconnected between the electrode pad and the RF signal connection part, and is inserted to surround the outside of the terminal part in the terminal insertion port. When the assembly portion is supported on the dielectric body and the dielectric body and a portion of the edge is supported to penetrate the hollow portion, elastically supporting the terminal portion in an operation in which the hollow portion is deformed in the vertical direction with respect to the portion of the edge. It includes an elastic member, the terminal portion, one that is in contact with the electrode pad It includes a side terminal and the other terminal connected to the RF signal connection.

Here, the terminal unit, the RF signal connection unit via the dielectric may be disposed in the terminal insertion port formed in the filter body provided therein.

In addition, the dielectric body is provided to cover a portion of the outer inner surface of the upper inner dielectric and the other terminal penetrating the terminal installation hole, which is provided to surround a part of the outer peripheral surface of the one terminal passing through the terminal installation hole provided as a hollow space. It may include a lower inner dielectric.

In addition, the dielectric body, the second elastic member installation end formed larger than the diameter of the peripheral hole so that the rim portion of the elastic member is supported and the first elastic member is formed stepped so as to be larger than the diameter of the second elastic member installation end Any one of the stages can be formed.

In addition, the elastic member, having the hollow portion in the form of a disc, the one end of the plurality of outer rim portions and the terminal portion supported by any one of the first elastic member installation end and the second elastic member installation end A plurality of lower support ends are provided so as to be supported by any one of the first elastic member installation end and the second elastic member installation end having the hollow portion in the form of a first elastic member and a disk having a plurality of inner rim portions that are engaged and supported. It may include a second elastic member having a boss portion formed extending below the elastic portion to surround the outer circumferential surface of the one terminal of the terminal portion passing through the elastic portion and the hollow portion.

In addition, the first elastic member, the outer edge portion and the inner edge portion by an outer incision extending a predetermined length toward the hollow from the outer circumferential surface and an inner incision extending a predetermined length from the hollow toward the outer circumferential surface. It may be provided to enable partitioning.

In addition, the first elastic member, the outer edge portion may be provided to be bent outward with respect to the inner edge portion,

In addition, the second elastic member, a plurality of inner elastic incisions formed incision up and down along the circumferential direction on the outside of the hollow portion, and a plurality of outer elastic incisions formed incision up and down along the circumferential direction outside the inner elastic incision. It may be provided to be elastically deformable by the portion.

In addition, the elastic member may be made of any one of beryllium copper (BeCu), suspension, and spring steel materials.

In addition, any one of the one terminal and the other terminal may be provided with a plurality of tension incisions formed long in the vertical direction.

In addition, the tension incision may be provided on the one terminal, and the upper end of the other terminal may be accommodated inside the lower end of the one terminal.

In addition, the tension incision may be provided at the other terminal, and the lower end of the one terminal may be accommodated inside the upper end of the other terminal.

In addition, the dielectric may support the outer peripheral surface of the one terminal or the other terminal on which the plurality of tension incisions are formed.

In addition, the contact portion of the one terminal of the terminal portion contacting the electrode pad may be formed in a conical shape rounded so that the upper end has a predetermined contact area.

In addition, the contact portion of the one terminal of the terminal portion that is in contact with the electrode pad may be formed in a round hemisphere shape so that the upper end has a predetermined contact area.

The cavitation filter according to an embodiment of the present invention can achieve various effects as follows.

First, the RF connector is embedded in the body in the thickness direction to have a more slim and compact structure design.

Second, an assembly method capable of minimizing the accumulated amount of assembly tolerances generated when assembling a plurality of filters and an easy mounting and RF signal connection structure design that uniformly maintains the frequency characteristics of the filter have an effect.

Third, while allowing relative movement, by adding side tension, it is possible to stably connect and has an effect of preventing degradation of antenna performance.

Fourth, an elastic member for resolving the assembly tolerance is provided with any of beryllium copper, suspension, and spring steel materials, and has an effect of preventing a decrease in reliability due to a compression reduction rate.

1 is a diagram showing a stacked structure of an exemplary Massive MIMO antenna,

2 is a cross-sectional view showing a state in which a cavity filter is stacked between an antenna board and a control board according to an embodiment of the present invention,

3 is a plan perspective view of the structure of a cavity filter according to an embodiment of the present invention as viewed from the bottom side;

Figure 4 is an exploded perspective view showing a state in which the filter module and the terminal part is a part of the cavity filter according to an embodiment of the present invention is separated,

5 is an exploded perspective view of FIG. 4,

6 is an exploded perspective view of a cavity filter according to an embodiment of the present invention,

7A and 7B are partial cross-sectional views of FIG. 3, and are cross-sectional views showing a state before and after bonding to a PCB board,

8A and 8B are modified examples of FIGS. 7A and 7B,

9 is a perspective view showing an embodiment of the elastic member in the configuration of FIG. 4,

10 is a perspective view showing a modification of one embodiment of the elastic member in the configuration of FIG. 9,

11 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 4,

12 is a partial cross-sectional view of FIG. 3 in which the elastic member of FIG. 11 is interposed.

20: cavity filter 21: filter body

25: Terminal insert 27: Installation groove

30: filter module 31: RF signal connection

40: terminal portion 50: one side terminal

60: other terminal 70: dielectric body

72: upper internal dielectric 73: lower internal dielectric

74: first elastic member installation stage 77: terminal installation hole

78: second elastic

member installation end

80A, 80B: elastic member

81a, 81b: hollow 82a: outer incision \

83a: inner incision 84a: outer rim \

85a: inner rim

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings.

It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the embodiments of the present invention, when it is determined that detailed descriptions of related well-known configurations or functions interfere with the understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.

In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. Also, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

1 is a diagram illustrating a stack structure of an exemplary Massive MIMO antenna.

1 is only an exemplary appearance of an antenna device 1 in which an antenna assembly including a cavity filter according to an embodiment of the present invention is embedded, and does not limit the appearance when actually stacked.

The antenna device 1 includes a housing 2 on which a heat sink is formed and a radome 3 coupled to the housing 2. An antenna assembly may be embedded between the housing 2 and the radome 3.

A power supply unit (PSU) 4 is coupled to a lower portion of the housing 2 through, for example, a docking structure, and the power supply unit 4 operates communication components provided in the antenna assembly. It provides the operating power for.

In the conventional antenna assembly, a cavity filter 7 is disposed on the rear surface of the antenna board 5 in which a plurality of antenna elements 6 are arranged on the front side, as many as the number of antennas, and the related PCB board 8 is subsequently stacked. It has a structure. The cavity filter 7 may be tuned and verified in detail so as to have a frequency characteristic that meets specifications individually before mounting. The tuning and verification process is preferably performed quickly in an environment having the same characteristics as the mounting state.

2 is a cross-sectional view showing a state in which a cavity filter is stacked between an antenna board and a control board according to an embodiment of the present invention.

Cavity filter 20 according to an embodiment of the present invention, referring to Figure 2, since it is possible to exclude the conventional RF connector 90 shown in Figure 1, the connection is easy, and a lower height profile The branch can provide an antenna structure.

In addition, the RF connection is provided on both sides of the height direction, even if vibration and heat distortion occurs in the antenna board 5 or the PCB board 8 by connecting with the cavity filter 20 according to an embodiment of the present invention RF connection This is maintained the same, there is an advantage that there is no change in the frequency characteristics.

3 is a plan perspective view of a structure of a cavity filter according to an embodiment of the present invention as viewed from the bottom, and FIG. 4 is a state in which a filter module and a terminal part which are a part of the cavity filter according to an embodiment of the present invention are separated Exploded perspective view, FIG. 5 is an exploded perspective view of FIG. 4, FIG. 6 is an exploded perspective view of a cavity filter according to an embodiment of the present invention, and FIGS. 7A and 7B are some cross-sectional views of FIG. 3, which are coupled to a PCB board 8A and 8B are modified examples of FIGS. 7A and 7B.

Referring to FIG. 3, the cavity filter 20 according to an embodiment of the present invention includes an RF signal connection unit (refer to reference numeral 31 below in FIG. 4), and has a hollow first case (not indicated in the drawing), A second case covering the first case (not indicated in the drawing), a terminal portion provided in the height direction of the cavity filter 20 on both sides in the longitudinal direction of the first case (see reference numeral 40 in FIG. 4), and both sides of the terminal portion 40 It includes a filter module 30 including an assembly hole 23 provided in the. The terminal part 40 penetrates through the terminal insertion hole 25 provided in the first case and electrically connects an external member 8, for example, an electrode pad (not shown) of the antenna board or PCB board 8 and an RF signal connection part. do.

The terminal portion 40, the lower end is supported in the drawing by the RF signal connection (not shown), when the antenna board or the PCB board 8 in close contact, the outer member 8 (in particular, the It can be elastically supported so that the assembly tolerance existing in the terminal insertion port 25 of the filter body 21 to be described later can be solved while being in constant contact with the electrode pad provided on one surface).

That is, the cavity filter 20 according to the present invention, the terminal portion 40 is provided separately as one terminal 50 and the other terminal 60, as will be described later, the shape and assembly tolerances for adding side tension It may be implemented as a specific embodiment to be described later for absorption.

More specifically, the terminal portion 40 is provided with two members (see

reference numerals

50 and 60 in FIG. 6) that are separated between the upper portion and the lower portion, as shown in FIGS. 4 to 8B, 2 A part of any one of the dog members may be provided as a separate type that is inserted into a part of the other member. In an embodiment of the present invention, it is adopted that a part of the upper end of the other terminal 60 is inserted under the one terminal 50. However, of course, the opposite structure is also employable.

In general, when the terminal portion 40 is not shown in the drawing, but provided with an integral filter, in order to solve the assembly tolerance, when receiving a predetermined assembly force by the assembler, a part of the terminal portion 40 is elastically deformed It is provided with an elastic body. However, the one-piece filter in which the terminal portion 40 is integrally formed does not require a separate shape design for separately adding side tension, since a break in electrical flow between the one end and the other end is not predicted.

On the contrary, when the terminal portion 40 is provided with a separable filter separated by two members, the resolution of the assembly tolerance is that the separated one terminal 50 and the other terminal 60 are mutually connected to each other by the above-described predetermined assembly force. The entire length may be contracted while being moved to overlap, and separate

elastic members

80A and 80B may be provided so that the entire length is extended and restored when the assembly force is removed. However, since the terminal unit 40 is provided to be separated into the one terminal 50 and the other terminal 60, there is a possibility that the electrical flow is disconnected when moved to overlap each other, so that the one terminal 50 and the other terminal Any one of the 60 may be provided with an elastic body, or a separate shape change for adding a side tension may be required.

Here, the term 'side tension', as described above, to prevent disconnection of the electrical flow between the one terminal 50 and the other terminal 60, one of the terminal 50 and the other terminal 60 One can be defined as the force transmitted in a direction different from the longitudinal direction toward the other.

On the other hand, due to the characteristics of the antenna device, when designing the shape change of the above-described terminal unit 40, the impedance matching design in the above-described terminal insertion port 25 should be performed in parallel, but the cavity filter 20 according to the present invention is implemented. In the detailed description of the examples, it will be described on the premise that the impedance in the terminal insertion port 25 is a matched state. Therefore, among the configurations of the embodiments of the cavity filter according to the present invention described with reference to FIG. 4 or less, the external appearance of a configuration such as a dielectric body 70 or a reinforcement plate inserted with the terminal portion 40 in the terminal insertion port 25 Can take different shapes depending on the impedance matching design.

The cavity filter 20 according to an embodiment of the present invention is provided to be spaced a predetermined distance from the outer member 8 having an electrode pad (not indicated on the drawing) on one surface, as illustrated in FIGS. 4 to 8B. The RF signal connection part and the electrode pad of the external member 8 are electrically connected to the RF signal connection part, and it is possible to eliminate the assembly tolerance existing at the predetermined distance, and at the same time, the electrical flow between the electrode pad and the resonance element is cut off. It includes a terminal portion 40 having a structure that can be prevented.

Here, the outer member 8, as shown in FIG. 2, an antenna board or an amplifier (Power Amplifier, PA), a digital board (Digital board), and TX Calibration, on which the antenna elements are disposed on the other surface, is an integrated one board ( It may be a general term for any one of the PCB boards provided as one-board.

In the following, as shown in FIG. 3, the filter body provided with the terminal insertion port 25 without dividing the external configuration constituting the embodiments of the cavity filter 20 according to the present invention into a first case and a second case ( 21), and will be indicated by reference numeral 21. The filter body 21 may be provided with a dielectric material that is easy for internal impedance matching design (see reference numeral '70' in FIGS. 7A and 7B). Preferably, it may be provided with a Teflon (Teflon) material.

In the filter body 21, as illustrated in FIGS. 4 to 8B, the terminal insertion port 25 may be provided in a hollow shape. The shape of the terminal insertion port 25 may have a shape suitable for impedance matching design.

The washer installation portion 27 may be grooved and formed on one surface of the filter body 21, particularly, on one side of the terminal portion 40 to be described later, where one terminal 50 is provided. The washer installation part 27 may be grooved so as to have a larger inner diameter than the terminal installation hole 77 to prevent the outer rim portion of the star washer 90, which will be described later, from being caught and prevented from being displaced upward.

In addition, the cavity filter 20 according to the first embodiment of the present invention may further include a star washer 90 fixed to the washer installation part 27.

In the star washer 90, the fixed end 91 provided in a ring shape is fixed to the washer installation portion 27, and from the fixed end 91 toward the center of the electrode pad side of the antenna board or PCB board 8 It may include a plurality of support end 92 formed inclined upward.

Such a star washer 90, when assembling an embodiment of the cavity filter 20 according to the present invention to the antenna board or PCB board 8 by the assembler, not shown through the above-described assembly hole 23 With respect to the fastening force by the fastening member of the plurality of support ends 92 are supported on one surface of the antenna board or PCB board 8 may add elastic force. The addition of elastic force of the plurality of support stages 92 serves to solve the assembly tolerances existing between the antenna board or the PCB board 8 of the embodiment of the cavity filter 20 according to the present invention.

However, the assembly tolerance absorbed by the star washer 90 is a concept different from the assembly tolerance absorbed by the terminal portion 40 as it will be described later in the terminal insertion port 25. That is, the cavity filter according to an embodiment of the present invention is designed to absorb the overall assembly tolerance in at least two places by separate members in a single assembly process, thereby enabling more stable coupling.

The terminal portion 40 in the cavity filter 20 according to an embodiment of the present invention, as shown in FIGS. 4 to 8B, one side terminal 50 contacting the electrode pad of the external member 8, RF As the signal connection portion, it may include the other terminal 60 fixed to the solder hole 32 formed in the extended portion in the form of a plate. However, the other terminal 60 does not necessarily have to be soldered directly to the RF signal connection part, and it is also possible to be coupled with another electrically conductive member that is electrically connected.

Here, one of the one terminal 50 and the other terminal 60 is inserted into the other of the other, and when assembled, a part of each end may be disposed to overlap each other by a predetermined length.

In the cavity filter 20 according to an embodiment of the present invention, the upper side of the other terminal 60 may be inserted into the lower side of the one terminal 50 on the drawing (in particular, see FIGS. 7A and 7B). . To this end, the lower end of one terminal 50 may be provided in the form of a hollow tube with an empty interior so that the upper end of the other terminal 60 is inserted.

When the terminal portion 40 provided as one terminal 50 and the other terminal 60 is installed in the terminal insertion port 25, the outside of the terminal 40 is wrapped for impedance matching within the terminal insertion port 25. Dielectric body 70 made of a dielectric material may be inserted.

The dielectric body 70 may be made of Teflon. However, the material of the dielectric body 70 is not limited to Teflon, and any material having a dielectric constant capable of impedance matching in the terminal insertion port 25 can be replaced.

In addition, the dielectric body 70 may be provided with a hollow space in which the center portion communicates up and down, and a terminal installation hole 77 in which a terminal portion 40 to be described later is substantially installed is formed.

The dielectric body 70 includes a lower internal dielectric 73 integrally injection molded with the other terminal 60 of the terminal portion 40 and an upper internal dielectric integrally injection molded with one terminal 50 of the terminal portion 40. (72) may be further included.

The lower inner dielectric 73 is formed when injection molding integrally with the other terminal 50, and a terminal through hole 73a through which the other terminal 60 penetrates may be formed. Similarly, the upper internal dielectric 72 is formed when injection molding integrally with one terminal 50, and a terminal through hole 72a through which one terminal 50 penetrates may be formed.

The upper inner dielectric 72 may be formed to surround and support a portion of the outer circumferential surface of one terminal 50, and the lower inner dielectric 73 may be formed to surround and support a portion of the outer peripheral surface of the other terminal 60.

However, the

dielectrics

72 and 73 are not necessarily manufactured by an injection molding method integrally with one terminal 50 and the other terminal 60 of the terminal portions 40.

That is, the upper inner dielectric 72 and the lower inner dielectric 73 may be separately assembled to have terminal through-

holes

72a and 73a, respectively, and assembled into a terminal installation hole 77.

Here, the upper internal dielectric 72 is disposed so that impedance matching is performed in the terminal insertion port 25, and the dielectric body (so as to move in the vertical direction with respect to the lower terminal 60 fixed to correspond to one terminal 50) 70) is preferably provided to be spaced apart, the lower internal dielectric 73 is disposed so that the impedance matching is made in the terminal installation hole 77, the dielectric body (70) to easily fix the other terminal (60) ) May be provided.

The above-described combination of the dielectric body 70, the lower inner dielectric 73 and the upper inner dielectric 72 can be individually designed to suit the overall impedance matching inside the filter body 21.

Meanwhile, a first elastic member installation end 74 may be formed in an upper portion of the terminal installation hole 77 of the dielectric body 70. The first elastic member installation end 74 is formed to be stepped so as to be larger than the diameter of the peripheral terminal installation hole 77, so that the edge end of the second elastic member 80A of the elastic member 80 described later is installed and supported. It can be formed as possible. Hereinafter, for convenience, a space in which the lower end of the one terminal 50 is located is defined as a terminal installation groove 76 and described. If the second elastic member installation end 74 refers to a portion formed to be stepped smaller than the terminal installation groove 76, on the contrary, the terminal installation groove 76 is a portion formed to be stepped smaller than the second elastic member installation end 74. It can be defined as called.

The boss portion 84b of the elastic member 80B according to another embodiment of the

elastic members

80A and 80B, which will be described later, may be installed on the bottom surface of the second elastic member installation end 74. This will be described in more detail later.

In addition, the first elastic member is formed to be stepped so that the diameter is larger than the diameter of the second elastic member installation end 74 in the portion of the terminal installation hole 77 corresponding to a position higher than the bottom surface of the terminal installation groove 76 Stages 78 may be formed. Here, the first elastic member installation end 78 may be provided with an elastic member 80A according to one embodiment of the

elastic members

80A and 80B described later. This will be described in more detail later.

9 is a perspective view showing an embodiment of the elastic member in the configuration of FIG. 4, FIG. 10 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 4, and FIG. 10 is a perspective view of the elastic member in the configuration of FIG. A perspective view showing a modification of one embodiment, FIG. 11 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 4, and FIG. 12 is a partial cross-sectional view of FIG. 3 in which the elastic member of FIG. 11 is interposed.

Cavity filter 20 according to an embodiment of the present invention, as shown in Figures 5 to 12, a portion of the rim is supported on the dielectric body 70, and is supported to penetrate through the

hollow portions

81a and 81b When the assembly force is transmitted to the terminal portion 40, the

hollow portions

81a and 81b with respect to a part of the rim may further include

elastic members

80A and 80B elastically supporting the terminal portion 40 in an operation of deforming in the vertical direction. have.

Here, the elastic members (80A, 80B) may be provided with any one of beryllium copper (BeCu), suspension, and spring steel materials. Among the materials of the

elastic members

80A and 80B generally employed, a silicone material may be employed, but in the case of a silicone material, elasticity deterioration occurs due to a predetermined compression shrinkage rate after a long period of use, and accordingly a cavity filter The problem of deteriorating long-term reliability can be pointed out.

In the cavity filter 20 according to an embodiment of the present invention, the material of the

elastic members

80A and 80B is not a general silicone material, but its elasticity is low, but the deterioration in compression shrinkage is less likely to occur and can be used for a long period of time. To ensure long-term reliability, as described above, it is provided with any of beryllium copper, suspension, and spring steel materials.

The

elastic members

80A and 80B have a hollow portion 81a in the form of a disc, as illustrated in FIGS. 9 and 10, but a plurality of outer rim portions supported by the first elastic member installation end 78 ( 84a) and one side of the terminal portion 40 may include a first elastic member 80A having a plurality of inner rim portions 85a to which the terminal 50 is engaged.

As shown in FIG. 9, the first elastic member 80A has an outer cutout 82a in which an outer rim 84a and an inner rim 85a extend a predetermined length from the outer circumference toward the hollow 81a. ) And the hollow portion 81a may be provided to be partitioned by an inner cut portion 83a that is cut in a predetermined length toward the outer circumferential surface.

Accordingly, the plurality of outer rim portions 84a are mutually separated by the plurality of outer cutouts 82a, and the plurality of inner rim portions 85a are mutually separated by the plurality of inner cutouts 83a. The first elastic member 80A may be formed in a zigzag ring shape in which adjacent outer edge portions 84a and inner edge portions 85a are interconnected.

When the assembly force is transmitted through the one side terminal 50 among the terminal portions 40 supported on the first elastic member 80A formed as described above, the outer edge portion 84a supported on the second elastic member installation end 78 is opened. As a reference, the inner edge portion 85a is elastically deformed downward to elastically support the terminal portion 40.

That is, as referred to in Figure 7a, the outer rim portion 84a and the inner rim portion 85a of the first elastic member 80A, when external forces such as assembly force are not transmitted, connecting portions connecting them respectively While supporting the terminal portion 40 in a state parallel to, as shown in Figure 7b, when an external force such as a predetermined assembly force is transmitted to the first elastic member (80A), the inner edge portion (85a) is a terminal portion Elasticity of the terminal portion 40 while moving downward in the direction in which the assembly force is provided together with the 40 and the shape of the connecting portion connecting the outer edge portion 84a and the inner edge portion 85a to be inclined downwardly inward. It is to be supported.

However, in the cavity filter 20 according to an embodiment of the present invention, the first elastic member 80A should not be limited to the shapes of FIGS. 7A and 7B and 9.

That is, as shown in FIGS. 8A, 8B, and 10, the first elastic member 80A, a portion corresponding to the outer edge portion 84a is bent outwardly with respect to the inner edge portion 85a at a predetermined angle. Can be formed. In order to add more reliable elastic force than having the mutually parallel surfaces as referred to in FIGS. 7A and 7B, and 9 by shifting the supporting surfaces of the outer rim 84a and the inner rim 85a from each other. to be.

However, a modification of the first elastic member 80A is that the outer edge portion 84a is formed to be bent relative to the inner edge portion 85a, resulting in cracks in the bending portion in repetitive use of elasticity. And no overall dimensional change.

In addition, as shown in FIGS. 8A and 8B, the filter body 21, which is implemented as a modification of the first elastic member 80A, is brought into close contact with the electrode pad of the outer member 8 to obtain a predetermined assembly force. If provided, it is possible to secure a solid support force to the first elastic member installation end 74 by the bent outer frame portion 84a.

On the other hand, the elastic member, as shown in FIG. 11, has a hollow portion 81b in the form of a disk, an elastic portion provided with a plurality of lower support ends 85b to be supported by the second elastic member installation end 74 The second elastic member 80B provided with a boss portion 84b formed to extend below the elastic portion so as to surround the outer circumferential surface of one terminal 50 of the terminal portion 40 penetrating through the hollow portion 81b (not shown in the drawing) ) May be further included.

The second elastic member 80B, as shown in FIG. 11, has a plurality of inner elastic incisions 83b and inner elastic incisions 83b formed incision up and down along the circumferential direction on the outside of the hollow portion 81b. It may be provided to be elastically deformable by a plurality of outer elastic incision (82b) formed incision up and down along the circumferential direction on the outside of the.

When the assembly force is transmitted through one terminal 50 of the terminal parts 40 supported on the second elastic member 80B formed as described above, based on the edge portion of the elastic part supported by the first elastic member installation end 74 The inner edge portion where the hollow portion 81b is located is elastically deformed downward to elastically support the terminal portion 40.

Through the elastic support action of the elastic members (80A, 80B), when the contact portion 53, which is the front end of one terminal 50 of the terminal portion 40, is assembled in close contact with the electrode pad side of the external member 8 , After being elastically deformed to solve the assembly tolerance existing in the terminal insertion port 25 as described above, one terminal of the terminal portion 40 so that the contact portion 53 of the one terminal 50 is continuously contacted with the electrode pad It serves to provide elasticity against 50).

On the other hand, the smaller the contact area of the contact portion 53 that is in contact with the antenna board or the PCB board 8, the smaller the one terminal 50 is. Therefore, as shown in FIGS. 4 to 12, the contact portion 53, which is the front end of the one terminal 50, may be formed in a conical shape that gradually decreases in width toward the upper side.

One side of the terminal 50 is an operation of contacting the electrode pad of the external member 8 through the contact portion 53 which is the front end thereof, and when the assembly force is provided by the assembler, the elastic member within the terminal insertion port 25 ( 80A, 80B) may be provided to be movable in the vertical direction in the drawing.

In addition, the lower end portion 52 of the one side terminal 50 into which the upper end portion of the other terminal 60 is inserted may be provided with a plurality of tension incisions 55 formed long in the vertical direction. The tension incision 55 may be formed to be cut so that the lower end 52 of the one side terminal 50 provided in the form of a hollow tube is divided into a plurality.

The tension incision 55 adds the above-described side tension in an operation to close the lower end 52 of one terminal 50 to the outer circumferential side of the upper end 61 of the other terminal 60 provided to be accommodated therein. Plays a role. Here, the dielectric body 70 is provided to support the outer circumferential surface of the one side terminal 50 on which the tension incision 55 is formed inward, the lower end portion of the one side terminal 50 cut by the tension incision 55 ( The inner surface of 52) is always in close contact with the outer peripheral surface of the upper end 61 of the other terminal 60 accommodated therein.

The addition of the side tension by the tension incision 55 can prevent the electric flow of the terminal portion 40 separated into two from occurring in advance.

On the other hand, the tip of the other terminal 60 of the terminal portion 40 is provided in a pointed shape so that it is easily inserted into the hollow tube shape of the one terminal 50, and the lower end of the other terminal 60 is RF described above It can be fixed to the signal connection.

Thus, the other terminal 60, the lower end is provided in the form of a hollow tube of the one side terminal 50, when the one side terminal 50 is moved downward by the assembly force, while the lower end is fixed to the RF signal connection unit ( 52) It is possible to absorb the assembly tolerance existing in the terminal insertion port 25 by inserting the depth deeper and stretching the vertical length of the terminal unit 40 as a whole.

On the other hand, one side of the terminal 50, as shown in Figures 7a, 8ab and 12, when no assembly force is provided, the contact portion 53 is the support end 92 of the configuration of the star washer 90 It may be formed to a height that protrudes higher than that.

The process of absorbing the assembly tolerance according to the assembly of the cavity filter 20 according to an embodiment of the present invention having such a configuration will be described with reference to the accompanying drawings (in particular, FIGS. 6 and 9).

First, as shown in FIGS. 7A to 8B and 10, the cavity filter 20 according to an embodiment of the present invention is attached to one surface of an external member 8 such as an antenna board or a PCB board provided with an electrode pad. After close contact, a fastening member (not shown) is fastened to the assembly hole to transmit a predetermined assembly force to the cavity filter 20. However, it is not necessary to closely attach the cavity filter 20 to one surface of the antenna board or PCB board 8, and on the contrary, an external member such as an antenna board or PCB board to the cavity filter 20 arranged at predetermined intervals. It is also possible to transmit the assembly force by making one surface of (8) close.

Then, the distance between the antenna board or PCB board 8 and the cavity filter 20 according to an embodiment of the present invention is reduced, and at the same time, the support end 92 of the star washer 90 is deformed by the aforementioned fastening force. As a result, the assembly tolerance existing between the cavity filter 20 and the antenna board or PCB board 8 according to an embodiment of the present invention is primarily absorbed.

At the same time, one terminal 50 of the terminal portion 40 is elastic while being pressed by one surface of an external member 8 such as an antenna board or PCB board so as to be moved a predetermined distance from the terminal insertion port 25 to the other terminal 60 side. Due to the elastically supported operation of the

members

80A and 80B, the assembly tolerance existing in the terminal insertion port 25 of the cavity filter 20 according to the first embodiment of the present invention is absorbed secondaryly.

At this time, the one terminal 50 and the other terminal 60, the lower end of the one terminal 50 is a side tension with respect to the upper end of the other terminal 60 inserted into the hollow tube shape by the tension incision 55 As this is added, the electrical flow can be prevented from being cut off, so that the signal performance degradation of the cavity filter 20 according to an embodiment of the present invention can be prevented.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

An embodiment of the present invention, a cavity filter having an assembly method capable of minimizing the accumulation amount of assembly tolerances generated when assembling a plurality of filters and an RF signal connection structure for easy mounting and maintaining the frequency characteristics of the filter uniformly Provides

Claims

An RF signal connection part provided to be spaced a predetermined distance from an external member having an electrode pad on one surface;

A terminal portion electrically connecting the electrode pad of the external member to the RF signal connection portion, absorbing assembly tolerances existing at the predetermined distance, and preventing disconnection of electrical flow between the electrode pad and the RF signal connection portion;

A dielectric body inserted to surround the outside of the terminal portion in the terminal insertion hole; And

An elastic member elastically supporting the terminal portion in an operation in which the hollow portion is deformed in the vertical direction with respect to the portion of the edge when an assembly force is transmitted to the terminal portion supported by the portion of the dielectric body and supported to penetrate the hollow portion; Including,

The terminal portion,

A terminal connected to the electrode pad; And

The other terminal connected to the RF signal connection unit; Cavity filter comprising a.
The method according to claim 1,

The terminal portion, the cavity filter, the RF signal connection portion is disposed in the terminal insertion hole formed in the filter body provided therein via the dielectric body.
The method according to claim 2,

The dielectric body,

Including a lower inner dielectric provided to surround a portion of the outer circumferential surface of the other terminal through the terminal installation hole and a top inner dielectric provided to surround a portion of the outer circumferential surface of the one terminal through the terminal installation hole provided in the hollow space , Cavity filter.
The method according to claim 3,

In the dielectric body, a second elastic member installation end formed larger than the diameter of the peripheral hole and a first elastic member installation end formed stepwise so as to be larger than the diameter of the second elastic member installation end to support the edge portion of the elastic member A cavity filter in which one is formed.
The method according to claim 4,

The elastic member,

Having a hollow portion in the form of a disc, a plurality of outer rim portions supported by any one of the first elastic member installation end and the second elastic member installation end, and a plurality of inner rims of which one side of the terminal portion is supported A first elastic member provided additionally; And

One side of the terminal portion penetrating through the hollow portion and the elastic portion provided with a plurality of lower support ends so as to be supported by any one of the first elastic member installation end and the second elastic member installation end having the hollow portion in the form of a disc A second elastic member provided with a boss portion formed extending below the elastic portion to surround the outer circumferential surface of the terminal; Cavity filter comprising a.
The method according to claim 5,

The first elastic member, the outer rim portion and the inner rim portion can be partitioned by an outer incision extending a predetermined length from the outer circumference toward the hollow and an inner incision extending a predetermined length from the hollow toward the outer circumferential surface. Cavity filter provided to be.
The method according to claim 6,

The first elastic member, the outer edge portion is provided with a cavity filter to be bent at a predetermined angle outward with respect to the inner edge portion.
The method according to claim 5,

The second elastic member, a plurality of inner elastic incisions formed incision up and down along the circumferential direction on the outside of the hollow portion, and a plurality of outer elastic incisions formed incision up and down along the circumferential direction outside the inner elastic incision. Cavity filter, provided to be elastically deformable by.
The method according to claim 1,

The elastic member, a cavity filter made of any one of beryllium copper (BeCu), suspension and spring steel materials.
The method according to claim 1,

Cavity filter is provided on one of the one terminal and the other terminal, a plurality of tension incisions formed long in the vertical direction.
The method according to claim 10,

The tension incision is provided on the one terminal, and the upper end of the other terminal is accommodated into the lower end of the one terminal, the cavity filter.
The method according to claim 10,

The tension incision is provided in the other terminal, the lower end of the one terminal is accommodated into the upper end of the other terminal, the cavity filter.
The method according to claim 10,

The dielectric body supports the outer peripheral surface of the one terminal or the other terminal on which the plurality of tension incisions are formed.
The method according to claim 1,

The cavity filter of the terminal portion, the contact portion of the one side of the terminal contacting the electrode pad is formed in a conical shape rounded to have a predetermined contact area.
The method according to claim 1,

A cavity filter formed in a hemispherical shape in which the upper end has a predetermined contact area, the contact portion of the one terminal of the terminal portion contacting the electrode pad.