WO2018133335A1

WO2018133335A1 - Electric coupling port structure, and cavity filter

Info

Publication number: WO2018133335A1
Application number: PCT/CN2017/091069
Authority: WO
Inventors: 李世超; 陈瑞斌
Original assignee: 深圳市国人射频通信有限公司
Priority date: 2017-01-22
Filing date: 2017-06-30
Publication date: 2018-07-26

Abstract

Provided in the present invention is an electric coupling port structure of a filter. The structure comprises a connector (20), a connection rod (30), a tap member (40), a metal gasket (50), and a coupling cylinder resonator (60). The connection rod (30) is connected to the connector (20). The tap member comprises a first installation end (41) and a second installation end (47), the first installation end is connected to the connection rod, and the second installation end is connected to the coupling cylinder resonator. The coupling cylinder resonator has a lower tubular cylindrical member at one end, and is provided with an open recess at a main body thereof. The open recess extends from an opening end of the coupling cylinder resonator to the lower portion thereof, and the open recess accommodates the second installation end extending into an interior center of the coupling cylinder resonator. The metal gasket is detachably held between the lower portion and the second installation end. The present invention has advantages of simple manufacturing, space-efficiency within a cavity to increase a Q factor for a single cavity, easy and convenient assembly, and high reliability.

Description

Title of Invention: An Electrically Coupled Port Structure and Cavity Filter Technical Field

[0001] The present invention relates to the field of radio frequency communication technologies, and in particular, to an electrically coupled port structure and a cavity filter.

Background technique

[0002] In microwave systems, cavity filters have been widely used in the communication field due to their low insertion loss and large power capacity. The selection of the cavity filter port coupling mode, the single cavity quality factor Q value, port delay and other factors have a decisive influence on the debugging and performance of the filter. The traditional filter electric coupling port structure is welded by the inner conductor of the connector and the matching connecting rod, and then the tap piece is lap welded by the connecting rod, and the other end of the tap piece is fixed to the inside of the cavity by the silver plated screw. The above way. Design and simulation of port delay size by adjusting the height of the gantry, the width and shape of the taps. However, such a port structure is relatively complicated, and the 吋 extension itself also occupies a part of the space of the cavity, thereby causing a significant drop in the Q value of the single cavity, resulting in a large insertion loss of the filter; The workload increases the production cost; due to the large amount of work and high processing requirements, the risk of substandard quality is prone to occur, which is not conducive to the passive intermodulation of products. In the trial production process, it is difficult to adjust the delay of the product. .

[0003] Therefore, there is a need for an electrically coupled port structure and a cavity filter that are simpler in structure, lower in processing cost, more reliable in quality, and convenient for subsequent adjustment of the delay, thereby overcoming the above-mentioned defects. . technical problem

Problem solution

Technical solution

In order to overcome the above disadvantages of the prior art, an aspect of the present invention provides an electrical coupling port structure of a filter, which includes a connector, a connecting rod, a tap piece, a metal spacer, and a coupled resonant column. The connecting rod is connected to the connector;

[0005] The tapping piece includes a first mounting end and a second mounting end, the first mounting end is connected to the connecting rod, and the second mounting end is connected to the coupling resonant column;

[0006] The coupled resonant column has a bottom cylindrical column at one end, and the column of the coupled resonant column is provided with a slot The mouth groove extends from the mouth end of the coupled resonator column to the bottom portion, and the mouth groove can accommodate the second mounting end to extend into the inner center of the coupled resonator column;

[0007] The metal gasket is detachably clamped between the bottom portion and the second mounting end.

[0008] As a preferred solution, the connector is provided with an inner conductor, and one end of the connecting rod is provided with a central blind hole extending in the axial direction, and the inner conductor is opposite to the central blind hole of the connecting rod. The fitting and fixing of the connector and the connecting rod are performed by welding.

[0009] As a preferred solution, the inner conductor is coaxial with a center line of the connecting rod.

[0010] As a preferred solution, the first connecting portion, the second connecting portion, and the third connecting portion are sequentially connected between the first mounting end and the second mounting end; the first connecting portion, the first connecting portion The second connecting portion and the third connecting portion form a U shape; the third connecting portion forms an "L" shape with the second mounting end, and the second mounting end is provided with a through hole.

[0011] As a preferred solution, the first mounting end and the second mounting end are connected by a plurality of bent portions.

[0012] As a preferred solution, a center boss is disposed at one end of the connecting rod and the tap piece, and the center boss is coaxial with a center line of the connecting rod.

[0013] As a preferred solution, one end of the connecting rod connected to the tap piece is provided with a central boss, the first mounting end is provided with a U-shaped groove, and the U-shaped groove is in the center boss After the snapping, the connecting rod and the tap piece are fixed by welding.

[0014] As a preferred solution, the metal gasket is a flat annular body having a thickness; the inner ring of the metal gasket is provided with a thread, and the outer diameter of the metal gasket is smaller than the coupled resonant column. Inner diameter.

[0015] The present invention further provides a cavity filter including a cavity, a cover plate mounted at the mouth end of the cavity, and as a preferred solution, the above-mentioned electrically coupled port structure, The connector is mounted to a sidewall of the cavity, and the coupled resonator column is mounted to the interior of the cavity.

[0016] As a preferred solution, the cavity filter further includes a tuning screw, the tuning screw passes through a threaded hole in the cover plate and protrudes into an inner center of the coupled resonator column; the tuning screw passes the locking The nut adjusts to the depth of the coupled resonator column and maintains a distance from the tap piece and the metal washer.

Advantageous effects of the invention

Beneficial effect [0017] The invention has the advantages of simple processing and manufacturing, saving space in the cavity to improve the single cavity Q value, simple assembly and higher reliability.

Brief description of the drawing

DRAWINGS

1 is a cross-sectional view of a cavity filter provided with an electrically coupled port structure according to the present invention; [0019] FIG. 2 is a partial exploded view of a cavity of the cavity filter of FIG.

3 is a schematic exploded view of a connector, a connecting rod and a tap piece in the cavity filter of FIG. 1; [0020] FIG.

4 is a schematic structural view of the tap sheet of FIG. 3.

[0022] The markings of FIGS. 1 to 4: cavity 10, port mounting hole 15, connector 20, inner conductor 22, connecting rod 30, center boss 32, tap piece 40, first mounting end 41, U-shaped groove 411, first connecting portion 42, second connecting portion 43 and third connecting portion 45, second mounting end 47, through hole 49, metal spacer 50, silver plated screw 53, coupling resonant column 60, cover plate 70, waveform The washer 71, the lock nut 73, and the tuning screw 75.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of the invention.

[0024] As shown in FIGS. 1 and 2, the present embodiment provides a cavity filter 6 provided with an electrically coupled port structure.

The cavity filter 6 includes a cavity 10, an electrically coupled port structure, and a cover plate 70 mounted to the port end of the cavity. The electrical coupling port structure is disposed at the receiving end and/or the transmitting end of the cavity 10, and includes a connector 20 mounted on an outer sidewall of the cavity 10 and a coupling component disposed inside the cavity 10. The coupling component includes: a connecting rod 30, the tap 40, the metal spacer 50, and the coupled resonator 60. The cavity 10 is provided with a port mounting hole 15 at the receiving end/transmitting end, and the connector 20 is correspondingly mounted to the port mounting hole 15 by screws. The inner conductor 22 on the connector 20 is directed toward the interior of the cavity 10 through the port mounting aperture 15 and is coupled to the coupling assembly within the cavity 10.

[0025] Referring to FIGS. 1 and 3, the connecting rod 30 is a cylindrical conductor having a central blind hole extending axially at one end and a central boss 32 at the other end. The central blind hole and the central boss 32 are both coaxial with the connecting rod 30. The inner conductor 22 of the connector 20 is adapted to the central blind hole of the connecting rod 30, and the inner conductor 22 is fitted into the central blind hole for snap fit. Preferably, the embedded end of the inner conductor 22 is coaxial with the connecting rod 30. Connecting rod 30 One end of the center blind hole is provided and the connector 20 is further fixed by welding. The connecting rod 30 is provided with one end of the center boss 32 to be connected to the tap piece 40.

Referring to FIGS. 1 and 2, the tap piece 40 is coupled between the connecting rod 30 and the coupling resonator 60. Preferably, the connecting rod _{30 is} perpendicular to the coupled resonant column ₆₀ .

Referring to FIGS. 1 and 4, the tap piece 40 is a bent-formed flat strip-like structure including a first connecting portion 42, a second connecting portion 43, and a third connecting portion 45 which are sequentially connected. The first connecting portion 42, the second connecting portion 43, and the third connecting portion 45 are formed in a U shape. The first connecting portion 42 has a first mounting end 41 at its end. In this embodiment, the first connecting portion 42 is coplanar with the first mounting end 41. The first mounting end 41 is provided with a U-shaped groove 41 1 at the end to receive the central boss 32 of the connecting rod 30, and the connecting rod 30 and the tapping piece 40 are fixed by manually welding the center boss 32 and the U-shaped groove 411. together. The U-shaped groove 411 has a sufficient depth to adjust the welding position of the first mounting end 41 and the connecting rod 30, thereby adjusting the positional relationship between the tap piece 40 and the connecting rod 30.

[0028] The third connecting portion 45 is approximately parallel to the first connecting portion 42, and in the present embodiment, the third connecting portion 45 is longer than the first connecting portion 42. In addition, the end of the third connecting portion 45 is provided with a second mounting end 47, and the end of the second mounting end 47 extends away from the first mounting end 41 so as to be "L" shaped integrally with the third connecting portion 45. The end of the second mounting end 47 defines a contact surface that is approximately parallel to the second connecting portion 43, and the second mounting end 47 is provided with a through hole 49.

Referring to FIGS. 1 and 2, the coupled resonator column 60 of the first cavity is disposed at the receiving end/transmitting end of the cavity 10, and the bottom portion is fixed to the cavity 10, and the whole is presented as a cylindrical column structure. On the side close to the connector 20, the column of the coupling resonator 60 is provided with a groove of a specific size. More specifically, the slot is vertically disposed from the top of the coupled resonator 60 to a position below or below the center of the coupled resonator 60. The above-described mouth groove has a sufficient width to accommodate the second mounting end 47 extending into the inner center of the coupled resonator column. The inner center of the coupling resonant column 60 is also mounted with a metal spacer 50 which is an oblate annular body having a thickness, the outer diameter of the metal spacer 50 being less than or equal to the inner diameter of the coupled resonant column 60. The contact surface formed by the second mounting end 47 is fixed to the inner center of the coupling resonator 60 with the metal spacer 50. The coupled resonant column 60 is provided with a threaded hole at the bottom, and the contact surface on the second mounting end 47 is in full contact with the metal spacer 50. The silver plated screw 53 passes through the through hole 49 and the inner ring on the metal spacer 50 in sequence. , locking and fastening with the threaded hole of the coupled resonator column 60.

[0030] Generally, in the prior art, the cavity filter controls the electrical coupling port by providing a delaying platform inside the cavity. The length of the delay. For the limited internal space of the cavity, the design of the Yantai platform is undoubtedly the difficulty of processing and manufacturing, resulting in excessive production costs. At the same time, the cavity filter produced is not accurate and the reliability is degraded, which is not conducive to mass production.

[0031] The present invention provides a more convenient method of delay adjustment: in the production process, metal pads 50 of different thicknesses can be pre-made, after installing a combined cavity filter, according to each The actual delay of the individual cavity is adjusted by adjusting the thickness of the metal spacer 50 to adjust the length of the cavity port. Preferably, the tapping piece 40 is formed by bending the elastic sheet material and has a certain elasticity as a whole to facilitate the fixed connection with the metal gasket 50 of different thicknesses.

Referring to FIG. 1, the cover plate 70 is provided with a threaded hole that is aligned with the coupled resonator 60 in the cavity 10. The threaded hole in the cover 70 is fastened to the wave washer 71 and the lock nut 73 by means of a gland, and the wave washer 71 is defined between the lock nut 73 and the cover 70. The coupled resonator column 60 has a cylindrical shape with one end opening, and the port end faces the cover plate 70. The tuning screw 75 on the cover plate 10 extends from the port end of the coupling resonator 60 to the inner center of the coupling resonator 60 through a threaded hole in the cover plate 70. The tuning screw 75 is provided with a thread matching the lock nut 73. The tuning screw 75 can be freely adjusted to the depth of the inner center of the coupling resonator 60 by the lock nut 73, thereby adjusting the frequency of the entire cavity filter. Preferably, the tuning screw 75 is coaxial with the silver plated screw 53.

In the present embodiment, the tap piece 40 is connected to the first mounting end 41 and the second mounting end 47 by a U-shaped structure (the first connecting portion 42, the second connecting portion 43, and the third connecting portion 45). Alternatively, the first mounting end 41 and the second mounting end 47 may be joined by other shapes, such as a structure having more bends.

[0034] It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is to be determined by the appended claims.

Claims

Claim

[Claim 1] An electrical coupling port structure of a filter, comprising: a connector (20), a connecting rod (30), a tap piece (40), a metal spacer (50), and a coupled resonator column (60) ), the connecting rod (30) is connected to the connector (20);

The tap piece (40) includes a first mounting end (41) and a second mounting end (47), the first mounting end (41) is coupled to the connecting rod (30), and the second mounting end ( 47) being connected to the coupled resonant column (60);

The coupled resonant column (60) has a bottom cylindrical column at one end, and the column of the coupled resonant column (60) is provided with a port groove, and the port groove is from the coupling of the resonant column (60) The mouth end extends to the bottom, the mouth groove can accommodate the second mounting end (47) to extend into the inner center of the coupling resonator column (60);

The metal shim (50) is detachably clamped between the bottom and the second mounting end (47).

[Claim 2] The electrically coupled port structure according to claim 1, wherein the connector (2)

0) an inner conductor (22) is provided, one end of the connecting rod is provided with a central blind hole extending in the axial direction, and the inner conductor (22) is fitted with the central blind hole of the connecting rod (30) , the connector (20) and the connecting rod (30) are fixed together by welding.

[Clave 3] The electrically coupled port structure according to claim 1, wherein the inner conductor (2)

2) Coaxial with the center line of the connecting rod (30).

[Claim 4] The electrically coupled port structure according to claim 1, wherein the first connecting portion (41) and the second mounting end (47) are sequentially connected to the first connecting portion (42) a second connecting portion (43), a third connecting portion (45); the first connecting portion (42), the second connecting portion (43) and the third connecting portion (45) forming a U shape; The three connecting portions (45) form an "L" shape with the second mounting end (47), and the second mounting end (47) is provided with a through hole (49).

[Claim 5] The electrically coupled port structure according to claim 1, wherein the first mounting end (41) and the second mounting end (47) are connected by a plurality of bent portion structures.

[Clave 6] The electrically coupled port structure according to claim 1, wherein at the connecting rod (30) one end connected to the tap plate (40) is provided with a central boss (32), and said central boss ₍₃₂₎ with the connecting rod (30) coaxial centerline.

[Clave 7] The electrically coupled port structure according to claim 1, wherein the connecting rod (3)

0) One end connected to the tap piece (40) is provided with a central boss (32), and the first mounting end (41) is provided with a U-shaped groove (411), and the U-shaped groove (411) is at the same place After the center boss (32) is snapped, the connecting rod (30) and the tap piece (40) are fixed by welding.

[Claim 8] The electrically coupled port structure according to claim 1, wherein the metal spacer

(50) is a flat annular body having a thickness; the inner ring of the metal gasket is provided with a thread, and an outer diameter of the metal gasket is smaller than an inner diameter of the coupled resonator column (60).

[Claim 9] A cavity filter comprising a cavity (10), a cover plate mounted at a mouth end of the cavity (70)

The electric coupling port structure according to any one of claims 1 to 8, wherein a connector (20) is mounted to a side wall of the cavity (10), and the coupled resonant column (60) is mounted to The interior of the cavity (10).

[Claim 10] The cavity filter according to claim 9, further comprising a tuning screw (7)

5), the tuning screw (75) passes through a threaded hole in the cover plate (70) and extends into the inner center of the coupling resonator column (60); the tuning screw (75) passes through a lock nut (73) Adjusting the depth into the coupled resonator column (60) and maintaining a distance from the tap piece (40) and the metal washer (50).