CN113131134A

CN113131134A - Communication equipment and filter thereof

Info

Publication number: CN113131134A
Application number: CN201911404833.3A
Authority: CN
Inventors: 周峰; 李华; 王磊; 刘学鑫
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-16

Abstract

The application discloses a communication device and a filter thereof, wherein the filter comprises a shell, a first side and a second side, wherein the first side and the second side are perpendicular to each other; the first filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch are divided into three rows arranged along the first direction; the second filtering branch circuit is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the second filtering branch circuit are divided into three rows arranged along the first direction; the first filtering branch and the second filtering branch are symmetrically arranged along the central line of the first direction. This application is through six row filter chambers of arranging along first direction for the compact structure in filter chamber reduces the wave filter volume, reduction in production cost, and second filtering branch road and first filtering branch road symmetry set up, do benefit to and relate to and make.

Description

Communication equipment and filter thereof

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication device and a filter thereof.

Background

In a mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.

The inventor of the application finds that the arrangement of a plurality of filter cavities in the filter is complex and irregular in long-term research and development work, the size of the filter is increased, and the production cost is increased.

Disclosure of Invention

The application provides a communication device and a filter thereof, which are used for solving the problems of the filter in the prior art.

In order to solve the technical problem, the application adopts a technical scheme that: a filter, the filter comprising:

a housing having a first direction and a second direction perpendicular to each other;

the first filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch are divided into three rows arranged along the first direction;

the second filtering branch circuit is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the second filtering branch circuit are divided into three rows arranged along the first direction;

the first filtering branch and the second filtering branch are symmetrically arranged along the central line of the first direction.

Through the six rows of filtering cavities arranged along the first direction, the structure of the filtering cavities is compact, the size of the filter is reduced, the production cost is reduced, and the second filtering branch and the first filtering branch are symmetrically arranged, so that the design and the manufacture are facilitated.

The first filtering cavities of the first filtering branch are in a row;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the seventh filtering cavity of the first filtering branch are in a row and are arranged along a second direction;

the fifth filtering cavity and the sixth filtering cavity of the first filtering branch are in a row and are arranged along the second direction;

the first filtering cavities of the second filtering branch are in a row;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the seventh filtering cavity of the second filtering branch are in a row and are arranged along a second direction;

the fifth filtering cavities and the sixth filtering cavities of the second filtering branch are in a row and are arranged along the second direction.

Seven filter chambers of the first filter branch and seven filter chambers of the second filter branch are uniformly distributed in three rows and are regularly distributed, so that the distribution space of the filter chambers is reduced, and the size of the filter is reduced.

The filter comprises a first filter branch, a second filter branch, a third filter branch, a fourth filter branch, a fifth filter branch and a sixth filter branch, wherein the first filter cavity to the third filter cavity of the first filter branch are arranged in a right triangle, and the connecting line of the center of the first filter cavity and the center of the second filter cavity of the first filter branch is vertical to the connecting line of the center of the second filter cavity and the center of the third filter cavity of the first filter branch;

a first included angle between a connecting line of the center of the third filter cavity and the center of the fourth filter cavity of the first filter branch and a connecting line of the center of the fourth filter cavity and the center of the fifth filter cavity is an obtuse angle;

a second included angle between a connecting line of the center of the fifth filter cavity and the center of the sixth filter cavity of the first filter branch and a connecting line of the center of the sixth filter cavity and the center of the seventh filter cavity is an obtuse angle;

the connecting line of the center of the first filter cavity and the center of the second filter cavity of the second filter branch is vertical to the connecting line of the center of the second filter cavity and the center of the third filter cavity of the second filter branch;

a third included angle between a connecting line of the center of the third filter cavity and the center of the fourth filter cavity of the second filter branch and a connecting line of the center of the fourth filter cavity and the center of the fifth filter cavity is an obtuse angle;

and a fourth included angle between a connecting line of the fifth filter cavity center and the sixth filter cavity center of the second filter branch and a connecting line of the sixth filter cavity center and the seventh filter cavity center is an obtuse angle.

Through the mutual matching and the regular distribution of the seven filter cavities of the first filter branch and the seven filter cavities of the second filter branch, the structure of the filter cavities can be compact, and the size of the filter is reduced.

The fourth filtering cavity to the seventh filtering cavity of the first filtering branch are arranged in an isosceles trapezoid shape;

and the fourth filtering cavity to the seventh filtering cavity of the second filtering branch are arranged in an isosceles trapezoid shape.

The second filter cavity of the first filter branch is respectively intersected with the first filter cavity and the third filter cavity, the fourth filter cavity of the first filter branch is respectively intersected with the third filter cavity and the fifth filter cavity, and the sixth filter cavity of the first filter branch is respectively intersected with the fifth filter cavity and the seventh filter cavity;

the second filter cavity of the second filter branch is respectively intersected with the first filter cavity and the third filter cavity, the fourth filter cavity of the second filter branch is respectively intersected with the third filter cavity and the fifth filter cavity, and the sixth filter cavity of the second filter branch is respectively intersected with the fifth filter cavity and the seventh filter cavity. Through crossing setting between two filtering cavities, can reduce the center distance between two filtering cavities, strengthen the coupling.

The fourth filter cavity and the seventh filter cavity of the first filter branch are arranged adjacently;

and a fourth filtering cavity and a seventh filtering cavity of the second filtering branch are arranged adjacently.

Two filter cavities sequentially coupled in the seven filter cavities of the first filter branch are window coupled;

two filter cavities sequentially coupled in the seven filter cavities of the second filter branch are window-coupled. The two filter cavities are coupled through the window, the space of the cavities can be fully utilized by adjacent arrangement, the size of the filter is reduced, and debugging and production cost reduction are facilitated.

The bandwidth range of the first filtering branch is as follows: 222-236 MHz;

the bandwidth range of the second filtering branch is as follows: 222-236 MHz.

Wherein, the resonant frequency of the first to seventh filter cavities of the first filter branch is located in the following range in sequence: 227Mhz-230Mhz, 227Mhz-230 Mhz;

the resonant frequencies of the first filtering cavity to the seventh filtering cavity of the second filtering branch circuit are sequentially located in the following ranges: 227Mhz-230Mhz, and 227Mhz-230 Mhz.

The resonant frequencies of the resonant cavities are basically the same, so that the convenience of manufacturing and debugging is improved

Two filter cavities sequentially coupled in the seven filter cavities of the first filter branch are window-coupled, and the seven filter cavities are sequentially arranged, so that the space of the cavities can be fully utilized, the size of the filter is reduced, and the debugging and the production cost are facilitated.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a communication device comprising an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter as described above for filtering a radio frequency signal.

The beneficial effect of this application is: be different from prior art, six rows of filtering cavities that this application was arranged through snakelike setting along first direction for the compact structure in filtering cavity reduces the wave filter volume, reduction in production cost, and second filtering branch road and first filtering branch road symmetry set up, do benefit to and relate to and make.

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 description of the embodiments are briefly introduced 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 based on these drawings without creative efforts.

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

fig. 2 is a schematic diagram of a topology of a first filtering branch provided in the present application;

fig. 3 is a schematic diagram of a topology of a second filtering branch provided in the present application;

fig. 4 is a schematic diagram of simulation results of a first filtering branch provided in the present application;

fig. 5 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a filter according to the present application. The filter 10 comprises a housing 11, a first filter branch 12 and a second filter branch 22. The housing 11 has a first direction D and a second direction L, and the first direction D of the housing 10 and the second direction L of the housing 11 may be disposed perpendicular to each other. The first filtering branch 12 may be a first receiving filtering branch or a first transmitting filtering branch, and the second filtering branch 22 may be a second receiving filtering branch or a second transmitting filtering branch.

The first filtering branch 12 is disposed on the housing 11 and is composed of seven filtering cavities 121 sequentially coupled to the first filtering branch 12, and the seven filtering cavities 121 of the first filtering branch 12 are divided into three rows arranged along the first direction D and are disposed in a serpentine shape. And the second filtering branch 22 is arranged on the housing 11 and consists of seven filtering cavities 221 coupled in sequence, and the seven filtering cavities 221 of the second filtering branch 22 are divided into three rows arranged along the first direction and are arranged in a serpentine shape. The first filtering branch 12 and the second filtering branch 22 are symmetrically arranged along a center line of the first direction. By arranging six rows of filter cavities along the first direction D, the seven

filter cavities

121 and 221 in the filter 10 are compact in structure, the size of the filter 10 is reduced, and the production cost is reduced.

Specifically, the first filter cavities a1 of the first filter branch 12 are in a row; the second filter cavity a2, the third filter cavity A3, the fourth filter cavity a4 and the seventh filter cavity a7 of the first filter branch 12 are in a row and are arranged along the second direction L; the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 12 are in a row and arranged along the second direction L.

The first filter cavities B1 of the second filter branch 22 are in a row; the second filter cavity B2, the third filter cavity B3, the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 22 are in a row and are arranged along the second direction L; the fifth filter cavity B5 and the sixth filter cavity B6 of the second filter branch 22 are in a row and arranged along the second direction L. The seven filter cavities 121 of the first filter branch 12 and the seven filter cavities 221 of the second filter branch 22 are uniformly distributed in three rows and are regularly distributed, so that the distribution space of the filter cavities is reduced, and the size of the filter 10 is reduced.

The first filtering cavity a1 to the third filtering cavity A3 of the first filtering branch 12 are arranged in a right triangle, and the connecting line of the center of the first filtering cavity a1 and the center of the second filtering cavity a2 of the first filtering branch 12 is perpendicular to the connecting line of the center of the second filtering cavity a2 and the center of the third filtering cavity A3 of the first filtering branch 12; the third filtering cavity A3 to the fifth filtering cavity a5 of the first filtering branch 12 are arranged in a triangle, and a first included angle between a connecting line of the center of the third filtering cavity A3 and the center of the fourth filtering cavity a4 of the first filtering branch 12 and a connecting line of the center of the fourth filtering cavity a4 and the center of the fifth filtering cavity a5 is an obtuse angle, optionally, the obtuse angle may be 95 degrees, 100 degrees, 120 degrees, 150 degrees, and the like; the fifth filtering cavity a5 to the seventh filtering cavity a7 of the first filtering branch 12 are arranged in a triangle, and a second included angle between a connecting line of the center of the fifth filtering cavity a5 and the center of the sixth filtering cavity a6 of the first filtering branch 12 and a connecting line of the center of the sixth filtering cavity a6 and the center of the seventh filtering cavity a7 is an obtuse angle, optionally, the obtuse angle may be 100 degrees, 110 degrees, 120 degrees, 130 degrees, and the like.

The first filtering cavity B1 to the third filtering cavity B3 of the second filtering branch 22 are arranged in a right triangle, and the connecting line of the center of the first filtering cavity B1 and the center of the second filtering cavity B2 of the second filtering branch 22 is vertical to the connecting line of the center of the second filtering cavity B2 and the center of the third filtering cavity B3 of the second filtering branch 22; the third filtering cavity B3 to the fifth filtering cavity B5 of the second filtering branch 22 are arranged in a triangle, and a third included angle between a connecting line of the center of the third filtering cavity B3 and the center of the fourth filtering cavity B4 of the second filtering branch 22 and a connecting line of the center of the fourth filtering cavity B4 and the center of the fifth filtering cavity B5 is an obtuse angle, optionally, the obtuse angle may be 95 degrees, 100 degrees, 120 degrees, 150 degrees, and the like. The fifth filtering cavity B5 to the seventh filtering cavity B7 of the second filtering branch 22 are arranged in a triangle, and a fourth included angle between a connecting line of the center of the fifth filtering cavity B5 and the center of the sixth filtering cavity B6 of the second filtering branch 22 and a connecting line of the center of the sixth filtering cavity B6 and the center of the seventh filtering cavity B7 is an obtuse angle, and optionally, the obtuse angle may be 100 degrees, 110 degrees, 120 degrees, 130 degrees, and the like.

Through the mutual matching and regular distribution of the seven filter cavities 121 of the first filter branch 12 and the seven filter cavities 221 of the second filter branch 22, the structure of the filter cavities can be compact, and the size of the filter 10 can be reduced.

The fourth filtering cavity a4 to the seventh filtering cavity a7 of the first filtering branch 12 are arranged in an isosceles trapezoid shape; the fourth filter cavity B4 to the seventh filter cavity B7 of the second filter branch 22 are arranged in an isosceles trapezoid. The mutual matching and regular distribution of the filter cavities of the first filter branch 12 and the second filter branch 22 can make the structure of the filter cavities compact, reduce the size of the filter 10, simplify the cavity arrangement structure of the filter cavities, reduce the complexity of products, improve the filtering performance of the filter 10, facilitate the debugging and layout of the filter 10, and reduce the cost.

Two filter cavities sequentially coupled in the seven filter cavities 121 of the first filter branch 12 are window-coupled; two filter cavities sequentially coupled in the seven filter cavities 221 of the second filter branch 22 are window-coupled. The two filter cavities are coupled through the window, the space of the cavities can be fully utilized by adjacent arrangement, the size of the filter is reduced, and debugging and production cost reduction are facilitated.

Specifically, the second filter cavity a2 of the first filter branch 12 intersects with the first filter cavity a1 and the third filter cavity A3, respectively, to form a cavity circle intersection region. Specifically, the second filtering cavity a2 of the first filtering branch 12 intersects with the first filtering cavity a1, two endpoints forming a cavity circle intersection region are an intersection point E and an intersection point F in fig. 1, respectively, a window is arranged in the cavity circle intersection region, so that the second filtering cavity a2 and the first filtering cavity a1 form window coupling, and the width of the window is equal to the length of a connecting line EF between the intersection point E and the intersection point F; the second filter cavity a2 and the third filter cavity A3 of the first filter branch 12 are intersected to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region, so that the second filter cavity a2 and the third filter cavity A3 form window coupling.

The fourth filter cavity a4 of the first filter branch 12 intersects with the third filter cavity A3 and the fifth filter cavity a5 respectively to form a cavity circle intersection region. Specifically, the fourth filter cavity a4 of the first filter branch 12 intersects with the third filter cavity A3 to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region, so that the fourth filter cavity a4 and the third filter cavity A3 form window coupling. The fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 12 are intersected to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region, so that the fourth filter cavity a4 and the fifth filter cavity a5 form window coupling.

The sixth filter cavity a6 of the first filter branch 12 intersects with the fifth filter cavity a5 and the seventh filter cavity a7 respectively to form a cavity circle intersection region. Specifically, the sixth filter cavity a6 of the first filter branch 12 intersects with the fifth filter cavity a5 to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region, so that the sixth filter cavity a6 forms a window coupling with the fifth filter cavity a 5. The sixth filtering cavity a6 of the first filtering branch 12 intersects with the seventh filtering cavity a7 to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region to couple the sixth filtering cavity a6 with the seventh filtering cavity a7 through the window.

Specifically, the second filter cavity B2 of the second filter branch 22 intersects with the first filter cavity B1 and the third filter cavity B3, respectively, to form a cavity circle intersection region. Specifically, the second filter cavity B2 of the second filter branch 22 intersects with the first filter cavity B1, two end points forming a cavity circle intersection region are an intersection point G and an intersection point H in fig. 4, respectively, a window is arranged in the cavity circle intersection region, so that the second filter cavity B2 and the first filter cavity B1 form window coupling, and the width of the window is equal to the length of a connecting line GH between the intersection point G and the intersection point H; the second filter cavity B2 of the second filter branch 22 intersects with the third filter cavity B3 to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region to couple the second filter cavity B2 with the third filter cavity B3 through the window.

The fourth filter cavity B4 of the second filter branch 22 intersects with the third filter cavity B3 and the fifth filter cavity B5 respectively to form a cavity circle intersection region. Specifically, the fourth filter cavity B4 of the second filter branch 22 intersects with the third filter cavity B3 to form two end points of a cavity circle intersection region, and a window is disposed in the cavity circle intersection region, so that the fourth filter cavity B4 forms a window coupling with the third filter cavity B3. The fourth filter cavity B4 of the second filter branch 22 intersects the fifth filter cavity B5 to form two end points of a cavity circle intersection region, and a window is arranged in the cavity circle intersection region to couple the fourth filter cavity B4 and the fifth filter cavity B5 through the window.

The sixth filter cavity B6 of the second filter branch 22 intersects with the fifth filter cavity B5 and the seventh filter cavity B7, respectively, to form a cavity circle intersection region. Specifically, the sixth filter cavity B6 of the second filter branch 22 intersects the fifth filter cavity B5 to form two end points of a cavity circle intersection region, and a window is disposed in the cavity circle intersection region, so that the sixth filter cavity B6 forms a window coupling with the fifth filter cavity B5. The sixth filter cavity B6 of the second filter branch 22 intersects the seventh filter cavity B7 to form two end points of a cavity circle intersection region, and a window is provided in the cavity circle intersection region to couple the sixth filter cavity B6 and the seventh filter cavity B7 through the window.

Through crossing setting between two filtering cavities, it is crossing to form the chamber circle, sets up the window in the crossing region of chamber circle, can reduce the center distance between two filtering cavities, strengthens the coupling.

Furthermore, the fourth filter cavity a4 of the first filter branch 12 is arranged adjacent to the seventh filter cavity a 7; further, the fourth filter cavity B4 of the second filter branch 22 is disposed adjacent to the seventh filter cavity B7.

Referring to fig. 2, fig. 2 is a schematic diagram of a topology structure of a first filtering branch circuit provided in the present application. The size of the first filter cavity a1, the size of the second filter cavity a2, the size of the third filter cavity A3, the size of the fourth filter cavity a4, the size of the fifth filter cavity a5, the size of the sixth filter cavity a6, and the size of the seventh filter cavity a7 of the first filter branch 12 may be the same. That is, the seven filter cavities 121 of the first filter branch 12 are sequentially coupled and may be disposed in a serpentine shape with equal intervals, so as to facilitate layout and debugging, and improve the uniformity of the filter 10.

Optionally, housing 11 is further provided with a first port (not shown) to which first filter chamber a1 is connected and a second port (not shown) to which seventh filter chamber a7 is connected. Wherein the first port and the second port may both be taps of the filter 10.

The bandwidth range of the first filtering branch 12 in this embodiment is: 222-236 MHz.

Specifically, the coupling bandwidth between the first port and the first filter cavity a1 ranges from 9Mhz to 14 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 7Mhz to 12 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 7Mhz to 12 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the second port is in the range of 9Mhz to 14Mhz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity a1 through the seventh filter cavity a7 of the first filter branch 12 are sequentially located in the following ranges: 227Mhz-230Mhz, and 227Mhz-230 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

Referring to fig. 3, fig. 3 is a schematic diagram of a topology structure of a second filtering branch circuit provided in the present application. The size of the first filter cavity B1, the size of the second filter cavity B2, the size of the third filter cavity B3, the size of the fourth filter cavity B4, the size of the fifth filter cavity B5, the size of the sixth filter cavity B6 and the size of the seventh filter cavity B7 of the second filter branch 22 may be the same. That is, the seven filter cavities 221 of the second filter branch 22 are sequentially coupled and may be disposed in a serpentine shape with equal intervals, so as to facilitate layout and debugging, and improve the uniformity of the filter 10.

Optionally, a third port (not shown) and a fourth port (not shown) are further disposed on the housing 11, the first filter cavity B1 is connected to the third port, and the seventh filter cavity B7 is connected to the fourth port. Wherein, the third port and the fourth port can be taps of the filter 10.

The bandwidth range of the second filtering branch 22 in this embodiment is: 222-236 MHz.

Specifically, the coupling bandwidth between the third port and the first filter cavity B1 ranges from 9Mhz to 14 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 7Mhz to 12 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 7Mhz to 12 Mhz; the coupling bandwidth between the seventh filter cavity B7 and the fourth port is in the range of 9Mhz-14Mhz, and the design requirements can be met.

Therefore, the resonant frequencies of the first filter cavity B1 through the seventh filter cavity B7 of the second filter branch 22 are sequentially located in the following ranges: 227Mhz-230Mhz, and 227Mhz-230 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

Therefore, the filter 10 of the present application is capable of reducing the size of the filter 10 and meeting the design requirements of the out-of-band rejection of the filter 10.

As shown in fig. 4, fig. 4 is a schematic diagram of a simulation result of the first filtering branch circuit provided by the present application, and through experimental tests, the bandwidth of the first filtering branch circuit 12 of the present application is located in the range of 222-236MHz, as shown by the frequency band curve 20 in fig. 4. The first filtering branch 12 of the present application has a bandwidth suppression of greater than 15dB between 218MHz and 220MHz, and a bandwidth suppression of greater than 15dB between 238MHz and 248MHz, so that the out-of-band suppression performance of the filter 10 can be improved.

The simulation result diagram of the second filtering branch 22 is consistent with the simulation result diagram of the first filtering branch 12, as shown in fig. 4, and is not repeated herein.

Please refer to fig. 5, wherein fig. 5 is a schematic structural diagram of an embodiment of a communication system according to the present application. The communication system 30 comprises an antenna 32 and a radio frequency unit 31 (RRU), the antenna 32 is connected to the radio frequency unit 31, the radio frequency unit 31 comprises a filter 10 as shown in the above embodiments, and the filter 10 is used for filtering radio frequency signals. In other embodiments, the rf unit 31 may be integrally designed with the antenna 32 to form an Active Antenna Unit (AAU). Some embodiments of the present application are referred to as filters and may also be referred to as combiners, i.e., dual-frequency combiners.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. A filter, characterized in that the filter comprises:

the second filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the second filtering branch are divided into three rows arranged along the first direction;

the first filtering branch and the second filtering branch are symmetrically arranged along a central line of the first direction.

2. The filter of claim 1,

the first filtering cavities of the first filtering branch are in a row;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the seventh filtering cavity of the first filtering branch are in a row and are arranged along the second direction;

the first filtering cavities of the second filtering branch are in a row;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the seventh filtering cavity of the second filtering branch are in a row and are arranged along the second direction;

and the fifth filtering cavity and the sixth filtering cavity of the second filtering branch are in a row and are arranged along the second direction.

3. The filter of claim 2,

the first filtering cavity to the third filtering cavity of the first filtering branch circuit are arranged in a right triangle, and a connecting line of the center of the first filtering cavity and the center of the second filtering cavity of the first filtering branch circuit is vertical to a connecting line of the center of the second filtering cavity and the center of the third filtering cavity of the first filtering branch circuit;

the first filtering cavity to the third filtering cavity of the second filtering branch circuit are arranged in a right triangle, and a connecting line of the center of the first filtering cavity and the center of the second filtering cavity of the second filtering branch circuit is vertical to a connecting line of the center of the second filtering cavity and the center of the third filtering cavity of the second filtering branch circuit;

4. The filter of claim 3,

5. The filter of claim 3,

the second filter cavity of the second filter branch is respectively intersected with the first filter cavity and the third filter cavity, the fourth filter cavity of the second filter branch is respectively intersected with the third filter cavity and the fifth filter cavity, and the sixth filter cavity of the second filter branch is respectively intersected with the fifth filter cavity and the seventh filter cavity.

6. The filter of claim 5,

the fourth filtering cavity and the seventh filtering cavity of the first filtering branch are arranged adjacently;

7. The filter according to any one of claims 1 to 6,

two filter cavities sequentially coupled in the seven filter cavities of the first filter branch are window-coupled;

two filter cavities sequentially coupled in the seven filter cavities of the second filter branch are window-coupled.

8. The filter of claim 1,

the bandwidth range of the first filtering branch is as follows: 222-236 MHz;

the bandwidth range of the second filtering branch is as follows: 222-236 MHz.

9. The filter of claim 8,

the resonant frequencies of the first filtering cavity to the seventh filtering cavity of the first filtering branch circuit are sequentially located in the following ranges: 227Mhz-230Mhz, 227Mhz-230 Mhz;

10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering a radio frequency signal.