KR20160061770A - Internal antenna module for vehicle - Google Patents

Abstract

The present invention provides an internal antenna module for a vehicle that can be contained easily in a vehicle without occupying a large space. The internal antenna module for a vehicle according to the present invention, which is installed inside a vehicle, comprises: a printed circuit board; a first antenna element placed at one end in the lengthwise direction of the printed circuit board and including a first feeding port connected to a first feeding part placed at one side or the other side in the widthwise direction of the printed circuit board; a second antenna element placed at the other end in the lengthwise direction of the printed circuit board and including a second feeding port connected to a second feeding part placed at one side or the other side in the widthwise direction of the printed circuit board; and first and second isolation slits extending in a shape diagonally symmetrical to each other from one side and the other side in a widthwise direction in the middle of the printed circuit board in a lengthwise direction, and having ends formed in an overlapping and facing shape.

Description

[0001] Internal antenna module for vehicle [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an antenna for a vehicle, and more particularly, to an antenna module for a vehicle in which broadband LTE communication or WIFI communication can be supported together in a vehicle.

Recently, wireless communication technology has attracted much attention because it is providing high quality multimedia service along with voice communication service through a portable terminal for mobile communication, so that it is converged with a next generation wireless communication service such as LTE (Long Term Evolution).

Generally, a communication system based on voice communication service is mainly used in a single input single output (SISO) system which uses only a single antenna element in narrow band channel characteristic within a limited frequency range. However, the SISO system using a single antenna requires more advanced technology because there are many difficulties to transmit a large amount of data at a high speed within a narrowband channel.

Accordingly, there is a need for a multiple input multiple output (MIMO) technique, which is a next generation wireless transmission technology capable of transmitting data transmission / reception rate faster with a lower error probability by independently driving each antenna using a plurality of antennas.

Such a MIMO system is widely used because it can efficiently use limited frequency resources by enabling high-speed data transmission without further increasing the frequency allocation used by the entire system by using multiple antennas at the transmitting and receiving end.

However, in the case of a MIMO antenna, it is necessary to overcome the deterioration of transmission / reception performance due to electromagnetic mutual coupling or insufficient isolation between antennas. To solve this problem, It is possible to consider a method of dropping λ / 2 or more (where λ is the wavelength of the radio wave radiated by the antenna). However, in the case of a small-sized antenna system, since the space for installing the antenna is limited, the above-mentioned problem can not be solved by a method of separating the distances between the antennas.

Meanwhile, with the development of automobile communication technology, there has been a growing interest in automotive antennas for supporting various radio communication services such as DMB, GPS, and mobile communication in vehicles as well as radio frequency signals such as existing AM / FM.

Such a vehicle antenna is configured such that a glass antenna incorporating an AM / FM antenna and a shark fin antenna capable of providing services such as GPS and T-DMB are mounted on the inside and the outside of the vehicle.

However, in the case of the conventional shark pin antenna, it is exposed to the outside, which not only makes the appearance of the vehicle coarse, but also easily damaged by the external environment and pressure, and it is difficult to install the antenna, There is a problem that a wind noise is generated during high-speed running.

Therefore, in the technical field of the present invention, there is an urgent need to develop a technology of an antenna that can be embedded in a vehicle, but also can support a MIMO system having broadband characteristics and ensure isolation and correlation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a multi- So that it can be easily built in.

It is another object of the present invention to provide a structure capable of maximizing isolation between antennas having different resonance frequencies disposed in a narrow space and improving ECC.

According to an aspect of the present invention, there is provided an internal antenna module installed inside a vehicle, including: a printed circuit board for power feeding and a common ground; First and second antenna elements disposed opposite to both ends of the printed circuit board; And a meandered type grating slit positioned at the center of the distance between the first and second antenna elements for electromagnetically isolating the first and second antennas from one another.

The grid slit is formed of a plurality of insulating slits formed on the printed circuit board.

The grating slit may include a first grating slit for blocking a current flowing from the first antenna element side to the second antenna element side to cut off the current flowing from the second antenna element side to the first antenna element side, And a second grating slit for shielding the second grating.

The first lattice slit includes a first body slit extending in a first direction and a first intermediate slit bent at a right angle at an end of the first body slit and extending in a second direction, A second body slit extending in a direction opposite to the first direction and extending in a direction opposite to the first direction, the second body slit extending in a direction opposite to the first direction, A second intermediate slit bent at a right angle at an end of the second intermediate slit and extending in a direction opposite to the second direction and a second end slit bent at a right angle at an end of the second intermediate slit and extending in the first direction.

The first grating slit and the second grating slit are disposed between the first body slit and the second body slit such that the first end slit and the second end slit are interposed. In particular, it is preferable that the first body slit and the second end slit are adjacent to each other, the second end slit and the first end slit are adjacent to each other, and the first end slit and the second body slit are adjacent to each other, It is preferable to arrange the second grating slit.

In addition, the length and width of the slits and the interval between adjacent slits are adjusted in consideration of the coupling with the resonance frequency of the adjacent antenna element.

Wherein a length of the first and second body slits is greater than a length of the first and second intermediate slits and the first and second end slits, and a length of the first and second end slits is larger than a length of the first and second body slits, And is at least equal to or greater than the length of the intermediate slit.

The first grating slit and the second grating slit have the same shape, and the first grating slit and the second grating slit are arranged to be diagonal to each other.

Wherein the first and second antenna elements are inverted L-shaped antennas or inverted F-shaped antennas having grounding ports grounded to a common ground of the printed circuit board.

The first and second antenna elements may be formed by forming a dielectric block and an antenna pattern on the dielectric block.

The first antenna element or the second antenna element may further include a stub structure for impedance matching.

In addition, the on-vehicle antenna module according to another aspect of the present invention may further include a third antenna element having a resonance frequency band different from that of the first and second antenna elements between the first and second antenna elements .

And the third antenna element is located at a center of a distance between the first antenna element and the second antenna element.

The third antenna element may be a loop antenna having a feed port connected to the printed circuit board and a ground port, or an inverted F antenna.

At this time, the feeding port and the grounding port of the three-antenna element are located at opposite corners of the printed circuit board, and at least a part of the antenna pattern of the third antenna element is disposed on the upper part of the grid slit.

Wherein the first and second antenna elements support an LTE frequency band and the third antenna element supports a WiFi frequency band.

Further, the vehicle-mounted antenna module according to the present invention further includes a housing for receiving the printed circuit board, the first antenna element, the second antenna element (also, a third antenna element), and the grating slit.

Further, a vehicle antenna system according to another aspect of the present invention includes a vehicle antenna module having the above-described structure, a vehicle AV system, and a cable connecting the vehicle-mounted antenna module and the AV system, And external power is supplied from the system to the printed circuit board of the vehicle-mounted antenna module. At this time, the vehicle-mounted antenna module is mounted on a dashboard of a vehicle.

According to the present invention, by forming a grid slit in a common ground so as to change a current distribution in a common ground, a built-in antenna module for a vehicle that can realize a broadband MIMO system in a narrow common ground and secure correlation with an isolation diagram to provide. In addition, the antennas of the MIMO system in the common ground can be integrated together with additional antennas that can affect the current distribution, so that the antennas which are located at different places in the vehicle can be integrated and installed inside the vehicle It is possible to prevent waste of space and to prevent damage due to external environment and pressure. In addition, it can be installed inside a vehicle to provide next generation wireless communication services such as LTE (Long Term Evolution) as well as WiFi communication.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a perspective view illustrating an embodiment of a vehicle-mounted antenna module according to the present invention.
Fig. 2 is a view showing the current distribution in the first and second isolation slits shown in Fig. 1. Fig.
3 is a view showing the current density in the first and second isolation slits according to FIG.
4 is a perspective view showing another embodiment of the vehicle-mounted antenna module according to the present invention.
5 and 6 are views illustrating a method of applying the vehicle-mounted antenna module according to the present invention to a vehicle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a perspective view showing an embodiment of a vehicle-mounted antenna module according to the present invention, FIG. 2 is a view showing a current distribution in the first and second isolation slits shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing another embodiment of the vehicle-mounted antenna module according to the present invention, and FIGS. 5 and 6 are views showing the current density in the first and second isolation slits according to the present invention, And the antenna module is applied to a vehicle.

1, a vehicle-mounted antenna module 100 according to the present invention includes a printed circuit board 1, first and second antenna elements 110 and 120, first and second isolation slits 210 , And a module case (300). The vehicle built-in antenna module 100 according to the present invention is configured as an independent module in the form of a box, as shown in Figs. 5 and 6, installed in the dashboard 20 of the vehicle 10, (30) via a cable.

The printed circuit board 1 includes first and second feeders 1a and 1b formed on a top surface thereof as a conductor layer to supply power to the first and second antenna elements 110 and 120, And serves as a common ground that is commonly grounded to the first and second antenna elements 110 and 120. The upper surface conductor layer of the printed circuit board 1 is formed by patterning a metal material having conductivity to serve as a common ground. The printed circuit board 1 is supplied with power from the outside through a cable 40 connected to the AV system 30.

The first antenna element 110 is disposed at one end in the longitudinal direction of the printed circuit board 1 and connected to the first feeding part 1a located at one side edge in the width direction of the printed circuit board 1, And has an inverted L-type antenna structure having a first feed port 111. The first antenna element 110 includes a first antenna pattern 112 extending from the first feed port 111 and transmitting and receiving electromagnetic waves to and from the first antenna element 110. The first antenna pattern 112 may be further bent at least once and may further include a stub structure 113 extending from the first antenna pattern 112 to improve the impedance matching property of the first antenna element.

The second antenna element 120 is disposed at the other end in the longitudinal direction of the printed circuit board 1 and connected to the second power feeder 1b located at one side edge in the width direction of the printed circuit board 1. [ And a second feed port 121 are provided. The second antenna element 120 is provided with a second antenna pattern 122 extending from the second feed port 121 and transmitting / receiving electromagnetic waves to / from the outside. The second antenna pattern 122 may be further bent at least once and may further include a stub structure 123 extending from the second antenna pattern 122 and improving the impedance matching property of the second antenna element .

In the present invention, the first and second antenna elements 110 and 120 may be formed in a space in the form of a metal strip or may be patterned on a dielectric block having a predetermined dielectric constant. In the case where the first and second antenna elements 110 and 120 are formed by patterning on the dielectric block, all known patterning techniques can be used. In particular, after the surface treatment of the antenna area with a laser, It is preferable to apply a method of forming a metal film.

The first and second antenna elements 110 and 120 are symmetrical to each other to support a MIMO system and can be designed to cover a communication band of LTE (Long Term Evolution). The antenna patterns 112 and 122 of the first and second antenna elements 110 and 120 may be arranged in parallel with each other.

Although the first and second antenna elements 110 and 120 are symmetrically symmetrical with respect to each other in the above embodiment, the present invention is not limited thereto. Although not shown in the drawings, Lt; / RTI >

In addition, although the first and second antenna elements 110 and 120 are described as being inverted L-shaped antennas that are not directly connected to the printed circuit board 1 and are grounded, And may have an inverted F-type antenna structure, which is not shown in the figure but further includes a grounding port that is grounded to a common ground of the printed circuit board 1.

The first and second isolation slits 210 and 220 are positioned approximately in the longitudinal direction of the printed circuit board 1 and are symmetrically diagonal to each other from one side and the other side in the width direction of the printed circuit board 1 And are formed in such a manner that their respective ends are opposed to each other. That is, the first and second isolation slits 210 and 220 are formed between the first and second antenna elements 110 and 120, respectively. The first and second isolation slits 210 and 220 are formed from the first and second antenna elements 110 and 120, And are spaced at equal intervals. The first and second isolation slits 210 and 220 may be narrow or elongated holes that are removed by penetrating the printed circuit board 1 in the cross-sectional direction, or may be formed in a narrow and long insulating path, Lt; / RTI > In addition, the first and second isolation slits 210 and 220 are bent at least once, and the ends of the first and second isolation slits 210 and 220 are opposed to each other at the center. The first and second isolation slits 210 and 220 may be formed using a laser engraving technique, various dry etching methods, wet etching techniques, or the like.

The first isolation slit 210 extends from the edge of the first surface 2 of the printed circuit board 1 substantially parallel to the first antenna pattern 112 of the first antenna element 110 to the second surface 3 A first body slit 210a extending in the width direction (longitudinal direction) toward the first body slit 210a and a second body slit 210b extending in the longitudinal direction (horizontal direction) of the printed circuit board 1 by being bent in a direction substantially perpendicular to the end of the first body slit 210a. A first intermediate slit 210b extending in a direction substantially perpendicular to an end of the first intermediate slit 210b and extending in parallel with the first body slit 210a on the first surface of the printed circuit board 1 2) extending in the width direction (longitudinal direction). The length of the first body slit 210a is greater than the length of the first end slit 210c or the first intermediate slit 210b and the length of the first end slit 210c is greater than the length of the first intermediate slit 210b. Is equal to or greater than the length of the slit 210b.

The second isolation slit 220 extends from the edge of the second surface 3 of the printed circuit board 1 substantially parallel to the second antenna pattern 122 of the second antenna element 120, A second body slit 220a extending in the width direction (longitudinal direction) toward the first body slit 220 and a second body slit 220b extending from the end of the second body slit 220a in a direction substantially perpendicular to the longitudinal direction of the printed circuit board 1 A second intermediate slit 220b extending in a direction substantially perpendicular to the end of the second intermediate slit 220b and extending parallel to the second body slit 220a in a second direction And a second end slit 220c extending in the width direction (longitudinal direction) toward the surface 3. Preferably, the length of the second body slit 220a is greater than the length of the second end slit 220c or the second intermediate slit 220b, and the length of the second end slit 220c is greater than the length of the second intermediate slit 220b. Is equal to or greater than the length of the slit 220b.

The first isolation slit 210 and the second isolation slit 220 are opposed to the first end slit 210c and the second end slit 220c with a predetermined distance therebetween, The first body slit 210a and the second body slit 220a face each other such that the first end slit 210c and the second end slit 220c are opposed to each other, As shown in Fig.

The first intermediate slit 210b and the second intermediate slit 220b are spaced apart from the first surface 2 and the second surface 3 of the printed circuit board 1 by a predetermined distance, The end 210d of the one end slit 210c and the end 210d of the second end slit 220c are spaced apart from the first intermediate slit 210b by a predetermined distance from the second intermediate slit 220b (Longitudinal direction).

As a result, the first isolation slit 210 and the second isolation slit 220 form a meandered shape through coupling between each other. The first end slit 210c and the first end slit 210c and the second end slit 220c and the first end slit 210c and the first end slit 210c, which are arranged side by side in the width direction, The length of the first and second body slits 210a and 220a and the lengths of the first and second terminal slits 210c and 220c are appropriately adjusted by appropriately adjusting the interval between the first body slit 220a and the second body slit 220a, The isolation characteristic between the antenna element 110 and the second antenna element 120 can be adjusted. In other words, by suitably adjusting the lengths of the slits in the transverse and longitudinal directions of the first isolation slit 210 and the second isolation slit 220 and the distance between the slits, the first antenna element 110 and the second The degree of isolation between the first antenna element 110 and the second antenna element 120 can be maximized by increasing the resonance rate with respect to the resonance frequency of the antenna element 120. [

The electric current supplied to the first feeder 1a and the second feeder 1b is induced in the first isolation slit 210 and the second isolation slit 220, The current is returned to the element 110 and the second antenna element 120 and most of the current is induced to the first isolation slit 210 and the second isolation slit 220 to minimize the current flowing to the opposite antenna element. That is, a strong current is induced in one side and the other side in the width direction of the printed circuit board 1 by the meander-shaped current path F by the first and second isolation slits 210 and 220, The current induced in the antenna on the opposite side to the first and second antenna elements 110 and 120 can not be invaded so that the degree of isolation between the first and second antenna elements 110 and 120 can be improved .

2 and 3, the current path F of the meander shape formed by the first and second isolation slits 210 and 220 of the vehicle-mounted antenna module according to the present invention is strong It can be seen that a current flow is formed and the current density at the corresponding portion increases sharply. This results in a strong current distribution between the first and second antenna elements 110 and 120 so as to completely insulate both sides of the first and second antenna elements 110 and 120, Can be improved.

Meanwhile, in the above-described embodiment, the antenna module of the MIMO system in which the vehicle-mounted antenna module takes charge of the LTE frequency band composed of the first and second antenna elements 110 and 120 has been described. However, the present invention is not limited to this, and may be configured as an integrated antenna module in which an antenna capable of changing the current distribution is added to the antenna of the MIMO system in the common ground of the printed circuit board 1 in the form of another embodiment . Hereinafter, another embodiment of the present invention will be described with reference to FIG.

4, a vehicle-mounted antenna module 100 according to another embodiment of the present invention includes a printed circuit board 1, first and second antenna elements 110 and 120, first and second And further includes a third antenna element 130 added to the isolation slits 210 and 220.

The vehicle-mounted antenna module 100 according to another embodiment of the present invention may further include a third antenna element 130, for example, in charge of the WIFI frequency band in the vehicle-mounted antenna module according to the embodiment of the present invention, But is substantially the same except that the antenna of the system is implemented in an integrated form with additional antennas. Therefore, a detailed description of the remaining components except for the third antenna element 130 will be omitted.

The third antenna element 130 is located between the first and second antenna elements 110 and 120 on the printed circuit board 1 and is located on the second side 3 of the printed circuit board 1 A third feed port 131 connected to the third power feeder 1c positioned near the first feed port 1c and a ground port 133 connected to the common ground of the printed circuit board 1, .

The third antenna element 130 may be disposed at a position spaced apart from the first and second antenna elements 110 and 120 by the same distance so that the distance between the first and second antenna elements 110 and 120 So that the current distribution is strongly formed. 4, the third antenna element 130 includes a third antenna pattern 132 extending from the third feed port 131 to transmit and receive electromagnetic waves to and from the third antenna port 130, 3 antenna pattern having a grounding port 133 at the end of the antenna pattern 132 and being grounded to a common ground at the other edge in the width direction of the printed circuit board 1. [ This is because the third antenna element 130 is fed from one side of the edge of the printed circuit board 1 and grounded to the other side of the printed circuit board 1 so that the middle of the first and second antenna elements 110 and 120 The isolation between the first and second antenna elements 110 and 120 can be further improved by forming a strong current distribution in the width direction on the printed circuit board 1 at the point.

Although the third antenna element 130 is described as a loop antenna in the above-described embodiment, the present invention is not limited thereto. Although not shown in the drawing, the third antenna element 130 The feed port 131 may not be provided at the end of the third antenna pattern 132 but may be branched on the third antenna pattern 132 and the end of the third antenna pattern 132 may be formed on the printed circuit Type antenna structure having a shape located on the other side edge in the width direction of the substrate 1. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Vehicle internal antenna module
110: first antenna element 120: second antenna element
130: third antenna element
210, 220: first and second isolation slits
300: Antenna module case

Claims (27)

A built-in antenna module installed inside a vehicle,
Printed circuit board for feed and common ground;
First and second antenna elements disposed opposite to both ends of the printed circuit board;
And a meandered type grating slit located at a center of a distance between the first and second antenna elements for electromagnetically isolating the first and second antennas from each other. module. The method according to claim 1,
Wherein the grid slit is constituted by a plurality of insulation slits formed on the printed circuit board. 3. The liquid crystal display device according to claim 2,
A first lattice slit for blocking a current flowing from the first antenna element side to the second antenna element side to cut off,
And a second grating slit for blocking a current flowing from the second antenna element side to the first antenna element side to cut off. 3. The method of claim 2,
The first lattice slit includes a first body slit extending in a first direction and a first intermediate slit bent at a right angle at an end of the first body slit and extending in a second direction, And a first end slit bent at a right angle at an end and extending in a direction opposite to the first direction,
The second grill slit includes a second body slit extending in a direction opposite to the first direction and a second intermediate slit bent at a right angle at an end of the second body slit and extending in a direction opposite to the second direction, And a second end slit bent at a right angle at an end of the second intermediate slit and extending in the first direction. 5. The method of claim 4,
And wherein the first grid slit and the second grid slit are disposed between the first body slit and the second body slit such that the first end slit and the second end slit are interposed between the first body slit and the second body slit. 6. The method of claim 5,
Wherein the first end slit and the second end slit are adjacent to each other, the second end slit and the first end slit are adjacent to each other, and the first end slit and the second end slit are adjacent to each other, And a grid slit is disposed on the antenna element. 7. The method according to any one of claims 4 to 6,
Wherein a length and a width of the slits and an interval between adjacent slits are adjusted in consideration of coupling with a resonance frequency of an adjacent antenna element. 7. The method according to any one of claims 4 to 6,
Wherein a length of the first and second body slits is greater than a length of the first and second intermediate slits and the first and second end slits. 9. The method of claim 8,
Wherein a length of the first and second terminal slits is at least equal to or greater than a length of the first and second intermediate slits. 7. The method according to any one of claims 3 to 6,
Wherein the first grating slit and the second grating slit have the same shape. 11. The method of claim 10,
Wherein the first grating slit and the second grating slit are arranged to be diagonal symmetrical with respect to each other. The method according to claim 1,
Wherein the first and second antenna elements are inverted L-shaped antennas. The method according to claim 1,
Wherein the first and second antenna elements are inverted F-shaped antennas having a grounding port grounded to a common ground of the printed circuit board. 15. The method according to claim 12 or 14,
Wherein the first and second antenna elements have a dielectric block and an antenna pattern formed on the dielectric block. 15. The method of claim 14,
Wherein the first antenna element or the second antenna element further comprises a stub structure for impedance matching. The method according to claim 1,
Further comprising a third antenna element between the first and second antenna elements, the third antenna element having a resonant frequency band different from that of the first and second antenna elements. 17. The method of claim 16,
Wherein the third antenna element is located at a center of a distance between the first antenna element and the second antenna element. 18. The method of claim 17,
Wherein the third antenna element is a loop antenna having a feed port and a grounding port connected to the printed circuit board. 18. The method of claim 17,
Wherein the third antenna element is an inverted F-type antenna having a feed port and a grounding port connected to the printed circuit board. 20. The method according to claim 18 or 19,
Wherein the feed port and the ground port of the three antenna elements are located at opposite corners of the printed circuit board and at least a portion of the antenna pattern of the third antenna element is disposed on the top of the grid slit. module. 17. The method of claim 16,
Wherein the first and second antenna elements support an LTE frequency band and the third antenna element supports a WiFi frequency band. 7. The method according to any one of claims 1 to 6,
Further comprising a housing for receiving the printed circuit board, the first antenna element, the second antenna element, and the grid slit. 20. The method according to any one of claims 16 to 19,
Further comprising a housing for receiving the printed circuit board, the first antenna element, the second antenna element, the third antenna element, and the grid slit. The vehicle-mounted antenna module of claim 22;
Vehicle AV system;
And a cable connecting the vehicle-mounted antenna module and the AV system,
Wherein external power is supplied from the AV system to the printed circuit board of the vehicle built-in antenna module via the cable. 25. The method of claim 24,
Wherein the vehicle-mounted antenna module is mounted on a dashboard of a vehicle. The vehicle-mounted antenna module of claim 23;
Vehicle AV system;
And a cable connecting the vehicle-mounted antenna module and the AV system,
Wherein external power is supplied from the AV system to the printed circuit board of the vehicle built-in antenna module via the cable. 27. The method of claim 26,
Wherein the vehicle-mounted antenna module is mounted on a dashboard of a vehicle.

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