CN215771478U

CN215771478U - Tap connecting sheet and cavity filter

Info

Publication number: CN215771478U
Application number: CN202121616474.0U
Authority: CN
Inventors: 刘东超; 张程
Original assignee: Anhui Tatfook Technology Co Ltd
Current assignee: Anhui Tatfook Technology Co Ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2022-02-08
Anticipated expiration: 2031-07-14

Abstract

The utility model is suitable for a wave filter technical field provides a take a percentage connection piece and cavity filter, should take a percentage the connection piece and include connection piece body and open circuit board group, and open circuit board group includes at least one open circuit board, and the connection piece body is equipped with first end and second end in its length direction, the side between the first end and the second end of connection piece body is connected to the one end of open circuit board. The open-circuit chip can generate transmission zero at a specific frequency point, and can inhibit out-of-band harmonics when applied to a filter, so that the out-of-band harmonic inhibition effect of the filter is improved, and the open-circuit chip is simple in structure, simple and convenient to manufacture and convenient for batch production; the cavity filter with the tap connecting sheet can generate transmission zero at a specific frequency point, has a good out-of-band harmonic suppression effect, and is simple in structure, simple and convenient to manufacture and convenient for batch production.

Description

Tap connecting sheet and cavity filter

Technical Field

The application relates to the technical field of filters, in particular to a tap connecting sheet and a cavity filter.

Background

In the field of radio frequency communication technology, cavity filters are widely used in microwave communication because they can implement frequency selection. However, with the continuous development of communication systems and requirements on device performance, higher passband far-end rejection requirements are put on filters to strictly avoid crosstalk between different base stations or base stations of different operators.

The existing cavity filter usually adopts a low-pass filter cavity to realize far-end inhibition, and the requirement of obvious far-end inhibition can be met only when the length of the low-pass filter meets certain conditions. However, the effective length of the low-pass filter cavity is not enough due to the higher and higher integration level of the existing cavity filter, and the requirement of far-end suppression cannot be met. Therefore, a solution is needed that can improve the distal rejection requirements of cavity filters.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a tap connecting piece, aiming at solving the technical problem that the requirement of far-end suppression cannot be met in the existing cavity filter.

The embodiment of the application realizes that, a connecting piece of taking a percentage, includes connecting piece body and open circuit chip group, open circuit chip group includes at least one open circuit piece, the connecting piece body is equipped with first end and second end in its length direction, open circuit chip's one end connect in first end with the side between the second end.

In one embodiment, the open circuit piece is in a straight strip shape, a curved strip shape or a broken line shape.

In one embodiment, the group of open circuit chips includes two or more open circuit chips, and the lengths of the two or more open circuit chips are not equal.

In one embodiment, the open-circuit pieces are L-shaped, and each open-circuit piece is disposed on the same side of the connecting piece body.

In one embodiment, at least one of the open tabs is disposed coplanar with at least a portion of the connecting tab body.

In one embodiment, a groove is formed in the connecting sheet body at a position corresponding to the open sheet.

In one embodiment, the groove and the open tab are separately arranged on opposite sides of the connecting tab body; or the groove and the open circuit piece are arranged on the same side of the connecting piece body, and one end of the open circuit piece connected with the connecting piece body is positioned in the groove.

In one embodiment, the number of the grooves is one; or the number of the grooves is multiple, the number of the open circuit pieces is multiple, and the grooves correspond to the open circuit pieces one to one.

In one embodiment, the tap connecting piece is an integrally formed piece; or the tap connecting sheet and the open sheet are separately molded and connected.

Another object of the present application is to provide a cavity filter, which includes a body having a resonant cavity, at least one resonator disposed in the resonant cavity, a tap connecting piece connected to the resonator and described in the above embodiments, a tap line connected to the tap connecting piece, and a port connected to the tap line.

The beneficial effect of the connection piece of taking a percentage and cavity filter that this application embodiment provided lies in:

the tap connecting piece comprises a connecting piece body and at least one open-circuit piece connected to the side face between the first end and the second end of the connecting piece body, wherein the open-circuit piece can generate a transmission zero point at a specific frequency point, and can inhibit out-of-band harmonics when being applied to a filter, so that the out-of-band harmonic inhibition effect of the filter is improved, and the tap connecting piece is simple in structure, simple and convenient to manufacture and convenient for batch production; the cavity filter with the tap connecting sheet can generate transmission zero at a specific frequency point, has a good out-of-band harmonic suppression effect, and is simple in structure, simple and convenient to manufacture and convenient for batch production.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic partial structural diagram of a cavity filter provided in an embodiment of the present application;

FIG. 2 is a partially exploded schematic view of the cavity filter of FIG. 1;

FIG. 3 is a schematic structural diagram of a tap connecting piece provided in an embodiment of the present application;

FIG. 4 is another structural schematic diagram of a tap connecting piece provided by an embodiment of the present application;

FIG. 5 is a simulated S-parameter curve of tap connection pads provided by embodiments of the present application; .

FIG. 6 is a waveform diagram illustrating simulation of tap connection pads provided in an embodiment of the present application;

fig. 7 is a simulated waveform diagram of a tap connection tab of a comparative example.

The designations in the figures mean:

100-a cavity filter;

9-body, 90-resonant cavity, 901-resonant cavity, 91-coupling window, 8-resonator, 71-first tap line, 72-second tap line, 73-third tap line, 61-input port, 62-output port, 51-low pass filter body, 4-metal rod, 41-large diameter part, 42-small diameter part, 3-coupling rod and 2-mounting part;

1-tapping connecting sheet;

11-connecting piece body, 111-first end, 112-second end, 12-open circuit piece group, 121-open circuit piece, 122-first open circuit piece, 123-second open circuit piece and 13-groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.

Referring to fig. 3 and 4, in an embodiment of the present application, a tap connecting tab 1 is provided, where the tap connecting tab 1 includes a connecting tab body 11 and a group of open tabs 12, the group of open tabs 12 includes at least one open tab 121, the connecting tab body 11 has a first end 111 and a second end 112 disposed along a length direction thereof, and one end of the open tab 121 is connected to a side surface between the first end 111 and the second end 112; the other end of the open tab 121 is an open end.

Referring to fig. 1 and 2 in combination, the tap tab 1 is used in a filter (e.g., a cavity filter 100) and is used to connect a tap line, e.g., between the tap line and a resonator 8. Specifically, one end of the connecting piece body 11 is connected to one tap line (e.g., the third tap line 73 in fig. 1 and 2), and the other end is connected to at least one tap line (e.g., the two parallel second tap lines 72 in fig. 1); alternatively, in alternative embodiments, one end of the connecting piece body 11 may be directly connected to the resonator 8. The connector piece body 11 is used to transfer electrical signals between the resonator 8 and the tap line.

In the field of rf transmission technology, the condition for the open-circuit plate 121 to generate resonance is that its length satisfies a quarter-wavelength relationship. That is, for a specific frequency point, the corresponding wavelength is λ, and when the length of the open-circuit patch 121 is a quarter wavelength (λ/4), the input impedance of the open-circuit patch 121 at the specific frequency point is 0, that is, the resonance can be generated at the specific frequency point. Thus, when the tap connecting piece 1 is applied in a filter, the introduction of the open piece 121 can form a transmission zero at the specific frequency point. Therefore, by reasonably setting the length of the open circuit piece 121, the transmission zero corresponding to the required frequency point can be obtained.

The tap connecting piece 1 provided by the embodiment of the application comprises a connecting piece body 11 and at least one open circuit piece 121 arranged on the side surface between the first end 111 and the second end 112 of the connecting piece body 11, wherein the open circuit piece 121 can correspond to a resonant frequency by virtue of the length of the open circuit piece, the open circuit piece 121 can generate a transmission zero point at a specific frequency point, and when the open circuit piece is applied to a filter, the out-of-band harmonic can be suppressed, the out-of-band harmonic suppression effect of the filter is improved, the structure is simple, the manufacture is simple and convenient, and the mass production is convenient.

In an alternative embodiment, the group of open-chip capacitors 12 includes one open-chip 121. Thus, a transmission zero corresponding to one frequency point can be obtained.

In an alternative embodiment, as shown in fig. 3 and 4, the open chip set 12 includes two open chips 121, and the lengths of the two open chips 121 are not equal. Thus, transmission zeros corresponding to the two frequency points can be obtained.

In an alternative embodiment, the group of open-circuit plates 12 includes three or more open-circuit plates 121, and the lengths of the open-circuit plates 121 are not equal. Thus, transmission zeros of a corresponding number of frequency points can be obtained.

That is, different numbers of transmission zeros may be generated by setting different numbers of open tabs 121 according to specific needs. It is understood, of course, that an increase in the number of open tabs 121 increases the manufacturing cost of the tap connecting piece 1, and may not be compatible with the structure of the filter, and therefore, the specific number of open tabs 121 is set in consideration of the manufacturing cost, the structure of the filter, and the like.

The opening piece 121 may be in a straight strip shape, a curved strip shape, or a bent shape. In other embodiments, any other available form of the open-circuit tab 121 may be used in the present application. In contrast, the forming method of the open tab 121 in the shape of a straight strip can be simpler, and the manufacturing cost can be lower. Moreover, it can be understood that the length of the open tab 121 in the shape of a curved strip or a bent strip is the total length extending along the shape thereof, and the nonlinear length, for example, the length of the open tab 121 in the shape of a curved strip is the length of the corresponding curve, and the length of the open tab 121 in the shape of a broken line is the sum of the lengths of the parts bent relatively, so that the open tab 121 in the shape of a curved strip or a bent strip can have a larger length in the same space, that is, the open tab 121 in a certain length can have a smaller space occupation, which is very advantageous for the miniaturization of the tap connecting piece 1 and the filter to which it is applied.

In the case that the number of the open-circuit plates 121 in the open-circuit plate group 12 is multiple, the shapes of the open-circuit plates 121 may be the same, please refer to fig. 3 and fig. 4 in combination. Of course, in alternative embodiments, the shapes of the open tabs 121 may be different or not identical. In practical applications, the shape of each open tab 121 needs to be specifically set according to the position and spatial characteristics of the tap connection tab 1 in the filter.

In one embodiment, for the case that the number of the open tabs 121 in the open tab group 12 is multiple, multiple open tabs 121 may be connected on the same side of the connecting tab body 11, as shown in fig. 3 and 4. This is provided for the purpose of reducing the space occupied by the open tab 121. Of course, in other embodiments, there may be at least two open tabs 121 attached to different sides of the tab body 11, as space permits or based on other needs.

In one embodiment, as shown in fig. 3 and 4, the connecting piece body 11 is provided with a groove 13 at a position where the open piece 121 is disposed. The purpose of this arrangement is that, because the increase of the open tab 121 may cause the problem of impedance mismatch between the tap connection pad 1 and the structure connected to the two ends of the tap connection pad, and further cause the influence on the electrical signal strength on the tap connection pad 1, the influence of the open tab 121 on the impedance of the tap connection pad 1 can be substantially or even completely cancelled through the arrangement of the groove 13, and further the electrical signal strength on the tap connection pad 1 is ensured.

The number of the grooves 13 may be one, and the one groove 13 may correspond to one or more open circuit pieces 121, as shown in fig. 3 and 4. In other alternative embodiments, the number of the grooves 13 may also be two or more, for example, the number of the grooves 13 is two and corresponds to two open-circuit pieces 121 respectively.

In one embodiment, the recess 13 and the open tab 121 are disposed on opposite sides of the tab body 11. As shown in fig. 4 in particular, the groove 13 is disposed on the connecting tab body 11 on a side facing away from the open tab 121. The purpose of setting up like this is that recess 13 can stagger the setting with open circuit piece 121 and can be completely relative in the position on connection piece body 11, and recess 13 can not influence each other with open circuit piece 121 in the position to can reduce this manufacturing difficulty and the cost of taking a percentage connection piece 1.

Referring to fig. 3, in an embodiment, the groove 13 is disposed on one side of the connecting tab body 11 where the open tab 121 is disposed, that is, the groove 13 and the open tab 121 are located on the same side of the connecting tab body 11, and one end of the open tab 121 for connecting with the connecting tab body 11 is substantially located in the groove 13. The purpose of this arrangement is that the groove 13 may make room for the arrangement of the open tab 121, so that the space occupation of the open tab 121 may be further reduced, which is further beneficial to reducing the volume of the tap connecting tab 1.

In one embodiment, the tap connecting piece 1 is an integrally formed piece, i.e. the connecting piece body 11 and the open piece 121 are integrally manufactured. For example, the molded article may be integrally molded by punching or the like. This has the advantage that the tap lug 1 does not need to be assembled. Alternatively, the connecting plate body 11 and the open plate 121 may be formed separately and connected together by welding or the like, which is suitable for the case where the connecting plate body 11 and the open plate 121 have small lengths and thus have great difficulty in stamping.

Hereinafter, the open plate group 12 including two open plates 121 will be described as an example. As shown in fig. 3 and 4, in the present embodiment, the two open tabs 121 are a first open tab 122 and a second open tab 123, respectively.

The first open-circuit piece 122 is L-shaped, and the second open-circuit piece 123 is L-shaped. Further, the first open piece 122 and the second open piece 123 are connected to the same side of the connecting piece body 11. Further, the first open piece 122 and the second open piece 123 extend in the same direction. The open ends of the first open piece 122 and the second open piece 123 may be bent toward the first end 111 or bent toward the second end 112.

In other embodiments, there may be at least one open tab 121 coplanar with at least a portion of the connector body 11. Thus, the occupied space can be reduced, for example, if the connecting sheet body 11 is in a straight strip shape or a plane bending shape, the plurality of open circuit pieces 121 can be coplanar with the connecting sheet body 11, and at this time, the tapping connecting sheet 1 is suitable for being installed in a flat space; if the connecting sheet body 11 is bent in a three-dimensional manner, at least one open tab 121 may be coplanar with a bent portion of the connecting sheet body 11, so that the space of the tap connecting sheet 1 is not additionally increased.

Referring to fig. 5, in the tap connecting piece 1 provided in the embodiment of the present application, the length of the first open tab 122 and the length of the second open tab 123 are set to correspond to 6.2GHz and 7.4GHz, respectively. Thus, through simulation, transmission zero points corresponding to the two frequency points are generated on the simulation S parameter curve.

Referring to fig. 6, in the tap connecting piece 1 provided in the embodiment of the present application, the suppression of the far-end harmonic reaches 57.5 dB. Please refer to fig. 7, which is a simulated waveform diagram of the conventional tap connecting piece, wherein the suppression of the far-end harmonic is only 36.4 dB. Therefore, the tap connecting piece 1 provided by the embodiment of the application improves the suppression of the out-of-band harmonic wave by more than 20dB in practical application, and obviously improves the far-end harmonic wave suppression effect.

Referring to fig. 1 and 2, a cavity filter 100 is further provided in the present embodiment, which includes a body 9 having a resonant cavity 90, at least one resonator 8 disposed in the resonant cavity 90, a tap connection pad 1 connected to the resonator 8 and described in the above embodiments, a tap line connected to the tap connection pad 1, and a port connected to the tap line.

The port may be the output port 62. The electrical signal is transmitted to the output port 62 via the resonator 8, tap connection pad 1 and third tap line 73 in that order.

In alternative embodiments, the tap connection pad 1 may be used to connect the tap line of the input terminal.

As shown in fig. 1 and fig. 2, the resonant cavity 90 includes a plurality of resonant cavities 901, and the number of the resonators 8 is plural, and the resonators 8 are disposed in the resonant cavities 901 in a one-to-one correspondence. A coupling window 91 is arranged between the adjacent resonator cavities 901, the resonator cavities 901 are connected through the coupling window 91, and the resonator 8 is coupled through the coupling window 91 arranged between the two resonator cavities 901. Of course, as shown in fig. 2, a coupling rod 3 supported by the mounting member 2 is further disposed in at least one of the coupling windows 91, and two ends of the coupling rod 3 are respectively close to and spaced apart from the two resonators 8, so that a capacitor is formed between the coupling rod 3 and the two resonators 8, and the two resonators 8 are coupled by the coupling rod 3.

In one embodiment, the cavity filter 100 further includes a low-pass filter body 51 and a metal rod 4 disposed in a low-pass filter cavity (not shown) of the low-pass filter body 51, wherein a plurality of spaced large diameter portions 41 are formed on the metal rod 4, a small diameter portion 42 is formed between the large diameter portions 41, a low impedance section is formed between the large diameter portions 41 and an inner wall of the low-pass filter body 51 to allow low-frequency signals to pass, and a high impedance section is formed between the small diameter portion 42 and the inner wall of the low-pass filter body 51 to block high-frequency signals. In this manner, the cavity filter 100 enables low frequency selection of electrical signals.

In the cavity filter 100 provided in the embodiment of the present application, the lengths of the first open-circuit plate 122 and the second open-circuit plate 123 correspond to frequency points in a high frequency band (for example, above 5 GHz). Thus, even if the low-pass filter body 51 and the metal rod 4 have a poor filtering effect on the high-frequency signal due to their own lengths, the tap connecting piece 1 can further suppress the high-frequency signal. Thus, the cavity filter 100 has a good far-end harmonic suppression effect; and the structure and manufacture of the tap connecting sheet 1 are simple, and the cavity filter 100 is convenient for mass production.

As shown in fig. 1 and 2, in one embodiment, a second tap line 72 is also connected between the resonator 8 and the tap connection pad 1. A first tap line 71 is also connected between the metal rod 4 and the resonator 8. The signal transmission path of the cavity filter 100 in this embodiment is: input port 61-low pass filter cavity-first tap line 71-resonator 8-second tap line 72-tap connection pad 1-third tap line 73-output port 62.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The tap connecting piece is characterized by comprising a connecting piece body and an open circuit piece group, wherein the open circuit piece group comprises at least one open circuit piece, a first end and a second end are arranged on the connecting piece body in the length direction of the connecting piece body, and one end of the open circuit piece is connected to the side face between the first end and the second end.

2. The tap lug of claim 1, wherein the open tab is in the form of a straight strip, a curved strip, or a folded line.

3. The tap strap of claim 2 wherein the set of open tabs comprises two or more open tabs, the two or more open tabs being of unequal lengths.

4. The tap connector lug of claim 3, wherein the open tabs are L-shaped and each open tab is disposed on the same side of the connector lug body.

5. The tap lug of claim 1, wherein at least one of the open tabs is disposed coplanar with at least a portion of the lug body.

6. The tap strap of claim 1 wherein a recess is provided in the strap body at a location corresponding to the open strap.

7. The tap strap of claim 6 wherein the groove and the open strap are disposed on opposite sides of the strap body; or the groove and the open circuit piece are arranged on the same side of the connecting piece body, and one end of the open circuit piece connected with the connecting piece body is positioned in the groove.

8. The tap lug of claim 6, wherein the number of said grooves is one; or the number of the grooves is multiple, the number of the open circuit pieces is multiple, and the grooves correspond to the open circuit pieces one to one.

9. The tap connection lug of claim 1, wherein the tap connection lug is an integrally formed piece; or the tap connecting sheet and the open sheet are separately molded and connected.

10. A cavity filter comprising a body having a resonant cavity, at least one resonator disposed within the resonant cavity, a tap connection pad connected to the resonator and according to any one of claims 1 to 9, a tap line connected to the tap connection pad, and a port connected to the tap line.