KR0164092B1 - Miniature resonance dielectric filter - Google Patents

Abstract

The present invention relates to a miniaturized dielectric resonator filter for use in an RF transceiver of a mobile station and a base station of a wireless system, comprising: a dielectric block having an internal electrode of an internal conductor hole in an equiaxed line and a defect for adjusting a resonance period coupling amount; It is formed on the dielectric block and has an open surface electrode having an open surface formed to have a capacitor structure with the internal electrode. The filter is compact and the manufacturing process is simple. The present invention relates to a miniaturized dielectric resonator filter that can be widely used for satellite communication and satellite communication.

Description

Miniaturized Dielectric Resonator Filter

1 is a coupling structure diagram of a conventional resonator filter.

2 is a coupling structure diagram of another conventional dielectric resonator filter.

3A, 3B, and 3C are plan, perspective and front views of a miniaturized dielectric resonator filter according to a first embodiment of the present invention.

4A, 4B, and 4C are plan, perspective and front views of a miniaturized dielectric air filter according to a second embodiment of the present invention.

5 is a plan view, perspective view and front view of a miniaturized dielectric resonator filter according to a third embodiment of the present invention.

6 is a plan view, perspective view, and front view of a miniaturized dielectric resonator filter according to a fourth embodiment of the present invention.

7 is a plan view, perspective view and front view of a miniaturized dielectric resonator filter according to a fifth embodiment of the present invention.

8 is an equivalent circuit diagram of a miniaturized dielectric resonator filter according to the first, third, fourth, and fifth embodiments.

9 is an equivalent circuit diagram of a miniaturized dielectric resonator filter according to the second embodiment.

* Explanation of symbols for the main parts of the drawings

101: dielectric coaxial resonator

102: open surface of the dielectric coaxial resonator

103: inner conductor of dielectric coaxial resonator

104: capacitor electrode 105: dielectric substrate

106: resonant period coupling capacitor 107: filter

108: lead wire 201: plated dielectric block

202: through hole for resonator inner conductor 203: through hole for adjusting coupling amount

204: dielectric cylinder for the vertical force capacitor

205: conductor rod 206: open surface

301: plated dielectric block 302: hole for inner conductor of resonator

303: groove for adjusting the coupling amount 304: open surface

305: electrode on the open surface 306: internal electrode

401 plated dielectric block 402 hole for resonator inner conductor

403: groove for adjusting the binding amount 404: opening surface

405: electrode on the open surface 406: internal electrode

501: plated dielectric block 502: hole for resonator inner conductor

503: engaging amount adjusting groove 504: opening surface

505: electrode on the open surface 506: internal electrode

507: through hole for adjusting the amount of bonding 601: plated dielectric block

602: hole for resonator inner conductor 603: groove for adjusting coupling amount

604: the open surface 605: the electrode of the open surface

606: internal electrode 607: groove for adjusting the side bond amount

701: plated dielectric block 702: hole for resonator inner conductor

703: coupling groove for adjusting the amount 704: opening surface

705: electrode on the open surface 706: internal electrode

707: through-hole for adjusting the binding amount 708: groove for adjusting the side binding amount

801: thrust part capacitor 802: inductance

803: coaxial resonator 901: input and output capacitor

902: capacitance 903: coaxial resonator

The present invention achieves miniaturization of filters by constituting the filter only with miniaturized dielectric blocks and electrodes on its surface, which are used in RF transceivers of mobile stations and base stations in wireless systems, thereby enabling mobile communications, personal communications, CT (Codeless Telephone) and satellites. The present invention relates to a miniaturized dielectric resonator filter that can be widely used for communication.

In general, the dielectric filter in the UHF band is used in the RF transceiver of the CT and portable telephone, and a TEM mode quarter-wave coaxial line using a high dielectric constant microwave dielectric is used for the dielectric filter for miniaturization.

Hereinafter, with reference to the accompanying drawings will be described with respect to the prior art.

1 is a coupling structure diagram of a conventional dielectric resonator filter.

As shown in FIG. 1, the conventional dielectric resonator filter has a structure in which the individual unit dielectric resonator 101 is capacitor-coupled to have filter characteristics.

The capacitor configuration implements the coupling capacitor 106 and the input / output capacitor 107 between the resonators as the electrode 104 on the dielectric substrate 105.

At this time, the engine electrode 104 is electrically connected to the inner conductor 103 of the open surface 102 of the coaxial resonator by the conducting wire 108.

However, the above-described conventional dielectric resonator filter has a problem that the volume is large and the manufacturing process is complicated because the coupling capacitor is formed on a separate substrate.

2 is a coupling structure diagram of another conventional dielectric resonator filter.

As shown in FIG. 2, another conventional dielectric resonator filter penetrates through holes 202 to form a coaxial resonator in one dielectric block 201, and has an open surface 206 and a coupling adjustment through hole 203. Plate all parts except).

In this filter structure, the coupling between the coaxial resonators is made through the ceramic dielectric, and the coupling amount is determined by the distance between the coaxial lines.

However, the input and output portions of the conventional dielectric resonator filter of the related art separately manufactured a dielectric cylinder 204 having a conductor rod 205 at the center. Since it must be inserted and packaged, this also has a problem that the volume becomes large and the manufacturing process becomes complicated.

Therefore, an object of the present invention is to solve a conventional problem, and in manufacturing a dielectric filter, a resonator may be formed using only one dielectric block and an electrode on the surface thereof without attaching a separate capacitor or an input / output terminal as in the prior art. To provide a miniaturized dielectric resonator filter that can achieve the miniaturization and low cost of the filter by forming a combination, an input / output capacitor and an input / output terminal.

The configuration of the present invention to achieve the above object is a dielectric block formed with an internal electrode of the hole for the inner conductor of the coaxial line and the groove for adjusting the resonance period coupling amount; It is formed on the dielectric block, and has an open surface electrode is formed to have an internal electrode and a capacitor structure.

When described with reference to the accompanying drawings the most preferred embodiment which can implement this invention by the above configuration as follows.

3A, 3B, and 3C are plan, perspective and front views of the miniaturized dielectric resonator filter according to the first embodiment of the present invention.

As shown in FIG. 3, the miniaturized dielectric resonator filter according to the first embodiment is a dielectric filter in which two poles are integrated, and the manufacturing method of the miniaturized dielectric resonator filter is as follows.

First, except for the open surface 304, all surfaces of the dielectric block 301 in which the inner conductor hole 302 and the resonance period coupling amount adjustment groove 303 of the coaxial line are formed are plated.

At this time, the inner life preserver 302 of the dielectric block 301 does not penetrate to the open surface 304, and the dielectric constant thickness remains between the open surface 304 and the end of the hole 302, so that the hole 302 The capacitor is formed between the open surface positive electrode 305 above and the internal electrode 306 at the end of the hole 302.

Coupling of the resonance period is made through the dielectric between the resonators, and the coupling amount is controlled by the width and depth of the coupling control groove 303 formed on the short-circuit side.

The coupling of the resonance period at this time is an inductive coupling consisting of a magnetic field formed through the dielectric between the resonators.

The input / output capacitor of the filter uses a capacitor between the electrode 305 and the internal electrode 306 of the open surface.

When the filter structure is manufactured as described above, the filter can be manufactured without installing a separate input / output hole to implement a capacitor, and the filter can be miniaturized and mounted.

In addition, the inductive coupling amount can be adjusted by the length and width of the coupling amount adjusting groove 303, and the fine error correction due to the tolerance of the dimension can be performed by laser or other suitable method of the inner wall metal part of the coupling amount adjusting groove 303. By removing it, it is possible to manufacture without a significant deterioration of the quality factor.

In addition, the frequency characteristic shows that the coupling of the resonance period is made by the magnetic field, so that the signal attenuation rate at a frequency higher than the pass band is greater than that at a frequency lower than the pass band.

Therefore, the use of such a filter when making a duplexer is advantageous because it can increase the attenuation at the receiving side frequency.

4A, 4B, and 4C are plan, perspective and front views of a miniaturized dielectric resonator filter according to a second embodiment of the present invention.

As shown in FIG. 4, the structure of the miniaturized dielectric resonator filter according to the second embodiment of the present invention is similar to that of the first embodiment. By forming the coupling amount adjusting groove 403 toward the short-circuit side, the coupling of the resonance period is a capacitive coupling consisting of a strong electric field formed through the dielectric on the open side.

The filter of such a structure does not need to install a separate board or input / output hole to implement a capacitor, and can be miniaturized and mounted.

In addition, the capacitive coupling amount can be adjusted by the length and width of the coupling amount adjustment groove 403, and fine error correction due to the tolerance of the dimension can be performed by laser or other suitable method of the inner wall metal part of the coupling amount adjustment groove 403. By removing it, it is possible to manufacture without a significant deterioration of the quality factor.

In addition, in terms of frequency characteristics, since the coupling of the resonance periods is performed by the electric field, the signal attenuation rate at a frequency lower than the pass band is greater than that at a frequency higher than the pass band.

Therefore, it is advantageous to use a filter of such a structure when making a duplexer to increase attenuation at the transmitting frequency.

5 is a plan view, perspective view, and front view of a miniaturized dielectric resonator filter according to a third embodiment of the present invention.

As shown in FIG. 5, the miniaturized dielectric resonator filter according to the third embodiment of the present invention forms a coupling amount adjusting groove 503 coupled to a magnetic field in a structure having a coupling amount adjusting through hole 507 to resonate. The coupling amount of the period is appropriately adjusted, and the electrode 505 on the open surface and the internal electrode 506 of the dielectric block 501 implement an input / output capacitor.

The coupling amount adjustment groove 503 coupled to the magnetic field may be replaced with the coupling amount adjustment groove 403 of the second embodiment coupled to the entire length. Therefore, the filter having such a structure can obtain the same effect as in the above-described first or second embodiment.

6 is a plan view, perspective view, and front view of a miniaturized dielectric resonator filter according to a fourth embodiment of the present invention.

As shown in FIG. 6, the miniaturized dielectric resonator filter according to the fourth embodiment of the present invention forms a coupling amount adjustment groove 603 coupled to a magnetic field in a structure having a side coupling amount adjustment groove 607 to resonate. By appropriately adjusting the coupling amount of the period, the electrode 605 on the open surface and the internal electrode 606 of the dielectric block 601 implement the input / output capacitor.

The coupling amount adjustment groove 603 coupled to the magnetic field may be replaced with the coupling amount adjustment groove 403 coupled to the electric field of the second embodiment.

The filter of this structure can achieve the same effects as in the first or second embodiment.

7 is a plan view, perspective view, and front view of a miniaturized dielectric resonator filter according to a fifth embodiment of the present invention.

As shown in FIG. 7, the miniaturized dielectric resonator filter according to the fifth embodiment of the present invention has a coupling amount coupled magnetically to a structure having a coupling amount adjusting through hole 707 and a side coupling amount adjusting groove 708. The adjustment groove 703 is formed to appropriately adjust the coupling amount of the resonance period, and the electrode 705 on the open surface and the internal electrode 706 of the dielectric block 701 implement an input / output capacitor.

It is possible to replace the coupling amount adjustment groove 703 coupled to the magnetic field with the coupling amount adjustment groove 403 coupled to the full length of the second embodiment.

The filter of this structure can achieve the same effect as in the first or second embodiment described above.

8 is an equivalent circuit diagram of a miniaturized dielectric resonator filter according to the first, third, fourth, and fifth embodiments.

As shown in FIG. 8, the input / output capacitor of the filter denotes the capacitance between the electrode 305 and the internal electrode 306 of the open surface as the capacitor 801, and the hole 302 for the inner conductor of the resonator is equivalent to the resonator. Reference numeral 803 denotes a resonance period coupling amount adjusting groove 303 as a coupling inductor 802. 9 is an equivalent circuit diagram of a miniaturized dielectric resonator filter according to the second embodiment.

As shown in FIG. 9, the input / output capacitor of the filter denotes the capacitance between the electrode 405 and the internal electrode 406 of the open surface by the capacitor 801, and the hole 402 for the conductor inside the resonator is equivalent to the resonator. Indicated by (903), the coupling period adjusting groove 403 for the resonance period is indicated by the coupling inductor (902). As described above, the miniaturized dielectric resonator filter according to the embodiment of the present invention can implement the filter using only one dielectric block and the electrodes on the surface thereof, thereby simplifying the manufacturing process and miniaturizing the filter. There is a convenient advantage.

In addition, this filter forms an input / output electrode of a dielectric filter to form an internal conductor and an input / output capacitor of the resonator so that the filter can be manufactured without attaching a separate terminal or capacitor to the outside. There are advantages in miniaturization, streamlining the manufacturing process, ease of mounting, high density and frequency characteristics.

Claims (6)

In a resonator filter using a dielectric, an internal conductor hole 302 and a resonance period coupling amount adjustment groove 303 of a slaughter line are formed, and a surface is plated to form a dielectric block 301, and the dielectric block 301 An open surface and an electrode surface which are not plated are formed on the upper surface of the electrode at intervals, and the inner conductor hole 302 is constant between the upper electrode surface and the end of the inner conductor hole without penetrating to the electrode surface. A miniaturized dielectric resonator filter, characterized in that a capacitor is formed between an upper electrode and an internal electrode at a hole end such that a dielectric having a thickness remains. 2. The front surface of the block of claim 1, wherein the opening surface of the dielectric block is insulated from the insulating surface so that the opening surface electrode formed on the top surface of the dielectric block and the electrode portion plated on the surface of the dielectric block are insulated from each other. A miniaturized dielectric resonator filter comprising a portion of an upper end portion and an upper end portion of an upper portion of the rear portion which are not plated so as to form a surface-mounted electrode which is convenient for automatic component insertion. The miniaturized dielectric resonator filter according to claim 1, wherein the coupling amount adjusting groove formed in the dielectric block is inductive or capacitive. 2. The miniaturized dielectric resonator filter according to claim 1, wherein the dielectric block further comprises grooves for adjusting side coupling amount between the resonator inner conductor holes. 2. The miniaturized dielectric resonator filter according to claim 1, wherein the dielectric block further comprises a through hole for adjusting the coupling amount between the resonator inner conductor holes. 2. The miniaturized dielectric resonator filter according to claim 1, wherein the dielectric block further comprises a coupling amount adjusting through-hole and a side coupling amount adjusting groove between the resonator inner conductor holes.