CN113131129A

CN113131129A - Communication device and filter thereof

Info

Publication number: CN113131129A
Application number: CN201911399812.7A
Authority: CN
Inventors: 杨绍春; 韩军平; 宋文刚; 陈砚昌
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. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the first port is respectively coupled with a first filtering branch and a second filtering branch which are arranged on the shell; the first filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros; the second filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the second filtering branch further form three inductive cross coupling zeros; through the mode, the number of taps can be reduced through the arrangement of the public port, the size of the filter is reduced, zero point suppression is realized through the pure-induction cross coupling zero point, the debugging index is convenient, the material consistency is good, and the product complexity is reduced.

Description

Communication device 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 device, 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 in long-term research and development work, in order to reduce the size of the filter, the filter is generally provided with two or more groups of filter branches with different frequencies, but each filter branch in the prior art needs to be provided with a tap independently, and the number of the taps is too large, so that the required welding points are too many, the size of the filter is not reduced, and the stability of the filter is influenced; in order to improve the out-of-band rejection effect of the filter, the filter is usually provided with cross-coupling zeros of different types or specifications, so that the filter has multiple material types, high production cost and poor product stability.

Disclosure of Invention

The application provides a filter to solve the filter of prior art and take a percentage quantity too much, lead to required welding point also more, the many technical problem of material kind.

To solve the above problem, an embodiment of the present application provides a filter, where the filter includes: a housing having a first direction and a second direction perpendicular to each other;

the first port is provided with a first filtering branch and a second filtering branch which are respectively coupled with the first port, and the first filtering branch and the second filtering branch are arranged on the shell;

the first filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros;

the second filtering branch circuit is composed of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the second filtering branch circuit further form three inductive cross-coupling zeros.

In order to solve the above problem, an embodiment of the present application provides a communication device, where the communication device includes an antenna and a radio frequency unit connected to the antenna, and the radio frequency unit includes the filter as described above and is configured to filter a radio frequency signal.

Compared with the prior art, the filter of this application includes: a housing having a first direction and a second direction perpendicular to each other; the first port, the first filtering branch and the second filtering branch which are coupled with the first port are arranged on the shell; the first filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the first filtering branch further form three cross-coupling zeros; the second filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the second filtering branch further form three inductive cross coupling zeros; through the mode, the first port of the filter can reduce the number of taps, reduce required welding points, reduce the size of the filter, and facilitate debugging and production cost reduction; the setting at pure cross coupling zero point can realize high-end zero point and restrain, and the debugging index of being convenient for simultaneously reaches the design requirement, and the material kind reduces, can reduce the product complexity, and the material uniformity is good, and product stability is high.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 diagram of an embodiment of a filter provided herein;

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 another embodiment of a filter provided herein;

FIG. 5 is a schematic diagram of a filter according to another embodiment of the present application;

fig. 6 is a schematic diagram of a topology of a fifth filtering branch provided in the present application;

FIG. 7 is a diagram illustrating a first simulation result of the filter provided herein;

FIG. 8 is a diagram illustrating a second simulation result of the filter provided herein;

fig. 9 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the 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 system 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 system.

The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11, a first port 12, and a first filtering branch 13 and a second filtering branch 14 respectively coupled to the first port 12, and disposed on the housing 11. The first filtering branch 13 and the second filtering branch 14 may be a receiving filtering branch and a transmitting filtering branch, respectively, or may be both a receiving filtering branch and a transmitting filtering branch. The housing 11 has a first direction L and a second direction D, and the first direction L of the housing 11 is perpendicular to the second direction D of the housing 11.

In this embodiment, the first filtering branch 13 is a transmitting filtering branch, and the second filtering branch 14 is a receiving filtering branch.

The first filtering branch 13 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the first filtering branch 13 further form three cross-coupling zeros 131.

The second filtering branch 14 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the second filtering branch 14 further form three inductive cross-coupling zeros 141.

In the embodiment, the first port 12 of the filter 10 can reduce the number of taps, reduce the number of required welding points, reduce the size of the filter 10, and facilitate debugging and reducing the production cost; the setting at pure cross coupling zero point can realize the suppression at zero point, and the debugging index of being convenient for reaches the design requirement, and the material type reduces, can reduce the product complexity, and the material uniformity is good, and product stability is high.

Wherein, the first filter cavity a1 to the third filter cavity A3 of the first filter branch 13 are arranged in a triangle, the projection of the center of the third filter cavity A3 in the first direction L is located between the center of the first filter cavity a1 and the projection of the center of the second filter cavity a2 in the first direction L, and the projection of the center of the first filter cavity a1 in the second direction D is located between the center of the second filter cavity a2 and the projection of the center of the third filter cavity A3 in the second direction D; the third filtering cavity A3 and the sixth filtering cavity a5 of the first filtering branch 13 are in a row and are sequentially arranged along the first direction L; the fourth filter cavity a4 to the sixth filter cavity a6 of the first filter branch 13 are arranged in a triangle, the projection of the center of the sixth filter cavity a6 in the first direction L is located between the center of the fourth filter cavity a4 and the projection of the center of the fifth filter cavity a5 in the first direction L, and the projection of the center of the fifth filter cavity a5 in the second direction D is located between the center of the fourth filter cavity a4 and the projection of the center of the sixth filter cavity a6 in the second direction D; the seventh filtering cavity B7, the sixth filtering cavity B6 and the fifth filtering cavity B5 of the second filtering branch 14 are in a row and are sequentially arranged along the first direction L; the second filter cavity B2, the third filter cavity B3 and the fourth filter cavity B4 of the second filter branch 14 are in a row and are sequentially arranged along the first direction L.

Further, the third filter cavity B3 of the second filter branch 14 is respectively disposed adjacent to the first filter cavity B1, the second filter cavity B2, the fourth filter cavity B4 and the fourth filter cavity B4 of the second filter branch 14; the fourth filtering cavity a4 of the first filtering branch 13 is respectively adjacent to the third filtering cavity A3, the fifth filtering cavity a5, the sixth filtering cavity a6 and the fifth filtering cavity B5 of the second filtering branch 14; the third filtering cavity B3 of the second filtering branch 14 is respectively adjacent to the first filtering cavity B1, the second filtering cavity B2, the fourth filtering cavity B4, the sixth filtering cavity B6 and the seventh filtering cavity B7.

Further, as shown in fig. 2, capacitive cross coupling is performed between the first filter cavity a1 and the third filter cavity A3, and capacitive cross coupling is performed between the fourth filter cavity a4 and the sixth filter cavity a6 of the first filter branch 13, and inductive cross coupling is performed between the third filter cavity A3 and the sixth filter cavity a6, so as to form three cross-coupling zeros 131 of the first filter branch 13, such as capacitors C1, C2, and an inductor L1 shown in fig. 2, respectively. The zero point suppression can be realized by the arrangement of the cross-coupling zero point 131 in the first filtering branch 13, so that the debugging index is facilitated, and the design requirement is met.

Specifically, a window may be disposed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 13, and a capacitive fly rod may be disposed at the window, so as to implement capacitive cross coupling between the first filter cavity a1 and the third filter cavity A3, forming a capacitive cross coupling zero, which is equivalent to the capacitor C1 of fig. 2. A window may be disposed between the fourth filter cavity a4 and the sixth filter cavity a6, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the fourth filter cavity a4 and the sixth filter cavity a6, and a capacitive cross coupling zero is formed, which is equivalent to the capacitor C2 of fig. 2. The third filter cavity A3 and the sixth filter cavity a6 may be provided with windows, and metal coupling ribs are provided at the windows, so that the third filter cavity A3 and the sixth filter cavity a6 realize inductive cross coupling, and form an inductive cross coupling zero, which is equivalent to the inductor L1 in fig. 2. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

As shown in fig. 3, the first filter cavity B1 and the third filter cavity B3, the third filter cavity B3 and the sixth filter cavity B6, and the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 14 are inductively cross-coupled to form three inductive cross-coupling zeros 141 of the second filter branch 14, such as the inductances L1, L2, and L3 shown in fig. 3. The inductive cross-coupling zero point 141 of the second filtering branch 14 is set to realize zero point suppression, so that the debugging index is facilitated, the design requirement is met, and the pure inductive cross-coupling zero point 141 is set to reduce the material types, reduce the product complexity, achieve good material consistency and achieve high product stability.

Specifically, a window may be disposed between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the first filter cavity B1 and the third filter cavity B3, and an inductive cross coupling zero 141 is formed, which is equivalent to the inductor L1 in fig. 3. A window may be disposed between the third filter cavity B3 and the sixth filter cavity B6 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the third filter cavity B3 and the sixth filter cavity B6, and an inductive cross coupling zero 141 is formed, which is equivalent to the inductor L2 in fig. 3. A window may be disposed between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the fourth filter cavity B4 and the sixth filter cavity B6, and an inductive cross coupling zero 141 is formed, which is equivalent to the inductor L3 in fig. 3. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy cannot pass through the network at the frequency point corresponding to the transmission zero, so that the complete isolation effect is achieved, the inhibition effect on signals outside the band-pass is achieved, and the high isolation among a plurality of band-passes can be better achieved.

In the embodiment, the first port 12 of the filter 10 can reduce the number of taps, reduce the number of required welding points, reduce the size of the filter 10, and facilitate debugging and reducing the production cost; the arrangement of the pure-induction cross coupling zero point can realize zero point inhibition, is convenient for debugging indexes, meets design requirements, reduces material types, can reduce product complexity, and has good material consistency and high product stability; the filter cavities are regularly arranged, so that debugging and reduction of the size of the filter 10 are facilitated; the zero point suppression can be realized by the arrangement of the cross coupling zero point 131 of the first filtering branch 13 and the inductive cross coupling zero point 141 of the second filtering branch 14, so that the debugging indexes are convenient, the design requirements are met, the material types can be reduced by the arrangement of the pure inductive cross coupling zero point, the product complexity is reduced, the consistency of the material is good, and the product stability is high.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 of the present embodiment further includes, on the basis of the embodiment shown in fig. 1: a second port 22, a third filter branch 15 and a fourth filter branch 16, which are coupled to the second port 22, respectively, are provided on the housing 11.

The third filtering branch 15 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the third filtering branch 15 further form three cross-coupling zeros 151.

The fourth filtering branch 16 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the fourth filtering branch 16 further form three inductive cross-coupling zeros 161.

The first filter cavity C1 to the third filter cavity C3 of the third filter branch 15 are arranged in a triangle, the projection of the center of the second filter cavity C2 in the first direction L is located between the center of the first filter cavity C1 and the projection of the center of the third filter cavity C3 in the first direction L, and the projection of the center of the first filter cavity C1 in the second direction D is located between the center of the second filter cavity C2 and the projection of the center of the third filter cavity C3 in the second direction D; the third filtering cavity C3 and the sixth filtering cavity C6 of the third filtering branch 15 are in a row and are sequentially arranged along the first direction L; the fourth filter cavity C4 to the sixth filter cavity C6 of the third filter branch 15 are arranged in a triangle, the projection of the center of the sixth filter cavity C6 in the first direction L is located between the center of the fourth filter cavity C4 and the projection of the center of the fifth filter cavity C5 in the first direction L, and the projection of the center of the fourth filter cavity C4 in the second direction D is located between the center of the fifth filter cavity C5 and the projection of the center of the sixth filter cavity C6 in the second direction D; the first filter cavity D1 to the third filter cavity D3 of the fourth filter branch 16 are arranged in a triangle, the projection of the center of the first filter cavity D1 in the first direction L is located between the center of the second filter cavity D2 and the projection of the center of the third filter cavity D3 in the first direction L, and the projection of the center of the second filter cavity D2 in the second direction D is located between the center of the first filter cavity D1 and the projection of the center of the third filter cavity D3 in the second direction D; the third filtering cavity D3 and the fourth filtering cavity D4 of the fourth filtering branch 16 are in a row and are sequentially arranged along the first direction L; the seventh filtering cavity D7, the sixth filtering cavity D6 and the fifth filtering cavity D5 of the fourth filtering branch 16 are in a row and are sequentially arranged along the first direction L.

Further, the sixth filtering cavity C6 of the third filtering branch 15 is respectively disposed adjacent to the third filtering cavity C3, the fourth filtering cavity C4, the fifth filtering cavity C5 and the seventh filtering cavity C7; the first filter cavity C1 of the third filter branch 15 is respectively disposed adjacent to the second filter cavity C2, the first filter cavity D1 of the fourth filter branch 16 and the fourth filter cavity D4; the fourth filtering cavity C4 of the third filtering branch 15 is respectively adjacent to the third filtering cavity C3, the fifth filtering cavity C5, the sixth filtering cavity C6 and the fourth filtering cavity a4 of the first filtering branch 13; the third filtering cavity D3 of the fourth filtering branch 16 is respectively adjacent to the first filtering cavity D1, the second filtering cavity D2, the fourth filtering cavity D4, the sixth filtering cavity D6 and the seventh filtering cavity D7; the fifth filter cavity D5 of the fourth filter branch 16 is further disposed adjacent to the fifth filter cavity B5 of the second filter branch 14.

The topology of the third filtering branch 15 is consistent with the topology of the first filtering branch 13, and the topology of the fourth filtering branch 16 is consistent with the topology of the second filtering branch 14, which is not described herein again.

Referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 of the present embodiment further includes, on the basis of the embodiment shown in fig. 4: a third port 32, a second filtering branch 14, a fourth filtering branch 16, a fifth filtering branch 17, and a sixth filtering branch 18 respectively coupled to the third port 32, and disposed on the housing 11.

The fifth filtering branch 17 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the fifth filtering branch 17 further form three inductive cross-coupling zeros 171.

The sixth filtering branch 18 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the sixth filtering branch 18 further form three inductive cross-coupling zeros 181.

The first filter cavity E1, the seventh filter cavity E7, and the sixth filter cavity E6 of the fifth filter branch 17, the seventh filter cavity B7, the sixth filter cavity B6, and the fifth filter cavity B5 of the second filter branch 14 are in a row and are sequentially arranged along the first direction L; the second filter cavity E2, the fifth filter cavity E5, the second filter cavity B2, the third filter cavity B3 and the fourth filter cavity B4 of the fifth filter branch 17 are in a row and are sequentially arranged along the first direction L; the third filter cavity E3, the fourth filter cavity E4 of the fifth filter branch 17 and the first filter cavity B1 of the second filter branch 14 are in a row and are sequentially arranged along the first direction L; the third filtering cavity F3 and the fourth filtering cavity F4 of the sixth filtering branch 18 are in a row and are sequentially arranged along the first direction L; the fifth filter cavity F5 of the sixth filter branch 18 and the second filter cavity D2 of the fourth filter branch 16 are in a row and are sequentially arranged along the first direction L; the seventh filtering cavity F7 and the sixth filtering cavity F6 of the sixth filtering branch 18 are in a row and are sequentially arranged along the first direction L; the second filtering cavity F2, the third filtering cavity F3 and the fifth filtering cavity F5 of the sixth filtering branch 18 are arranged in a triangular shape, the center of the third filtering cavity F3 is in the center of the second filtering cavity F2 and the center of the fifth filtering cavity F5 in the projection of the first direction L are between the projections of the first direction L, and the center of the second filtering cavity F2 is in the center of the third filtering cavity F3 and the center of the fifth filtering cavity F5 in the projection of the second direction D.

Further, the seventh filtering cavity E7 of the fifth filtering branch 17 is respectively disposed adjacent to the first filtering cavity E1, the second filtering cavity E2, the fifth filtering cavity E5 and the sixth filtering cavity E6; the fourth filter cavity E4 of the fifth filter branch 17 is respectively adjacent to the third filter cavity E3, the fifth filter cavity E5, and the first filter cavity B1 and the second filter cavity B2 of the second filter branch 14; the second filter cavity E2, the third filter cavity E3, the sixth filter cavity E6, the seventh filter cavity E7 of the fifth filter branch 17, the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 14 are arranged in a regular hexagon; the sixth filtering cavity F6 of the sixth filtering branch 18 is respectively adjacent to the second filtering cavity F2, the fifth filtering cavity F5, the seventh filtering cavity F7 and the seventh filtering cavity D7 of the fourth filtering branch 16; the fourth filter cavity F4 of the sixth filter branch 18 is disposed adjacent to the third filter cavity F3, the fifth filter cavity F5 and the second filter cavity D2 of the fourth filter branch 16, respectively.

As shown in fig. 6, the second filter cavity E1 and the fifth filter cavity E3, the third filter cavity E3 and the fifth filter cavity E6, and the fifth filter cavity E4 and the seventh filter cavity E6 of the fifth filter branch 17 are inductively cross-coupled to form three inductive cross-coupling zeros 171 of the fifth filter branch 17, such as the inductances L1, L2, and L3 shown in fig. 6. The inductive cross-coupling zero point 171 of the fifth filtering branch 17 can be set to realize zero point suppression, so that the indexes can be conveniently debugged to meet the design requirements, and the pure inductive cross-coupling zero point 171 can be set to reduce the material types and reduce the product complexity, so that the material consistency is good and the product stability is high.

Specifically, a window may be disposed between the second filter cavity E1 and the fifth filter cavity E3 of the fifth filter branch 17, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is implemented between the second filter cavity E1 and the fifth filter cavity E3, and an inductive cross coupling zero 171 is formed, which is equivalent to the inductor L1 in fig. 6. A window may be disposed between the third filter cavity E3 and the fifth filter cavity E6 of the fifth filter branch 17, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the third filter cavity E3 and the fifth filter cavity E6, and an inductive cross coupling zero 171 is formed, which is equivalent to the inductor L2 in fig. 6. A window may be disposed between the fifth filter cavity E4 and the seventh filter cavity E6 of the fifth filter branch 17, and a metal coupling rib is disposed on the window, so that the fifth filter cavity E4 and the seventh filter cavity E6 realize inductive cross coupling, and an inductive cross coupling zero 171 is formed, which is equivalent to the inductor L3 of fig. 6. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

The topology of the sixth filtering branch 18 is consistent with the topology of the fifth filtering branch 17, and is not described herein again.

Optionally, a fourth port (not shown), a fifth port (not shown), a sixth port (not shown) and a seventh port (not shown) are further disposed on the housing 11.

The first filtering cavity a1 of the first filtering branch 13 is connected with the first port 12, and the seventh filtering cavity a7 of the first filtering branch 13 is connected with the fourth port; the first filter cavity B1 of the second filter branch 14 is connected with the first port 12, and the seventh filter cavity B7 of the second filter branch 14 is connected with the third port 32; the first filter cavity C1 of the third filter branch 15 is connected to the second port 22, and the seventh filter cavity C7 of the third filter branch 15 is connected to the fifth port; the first filter cavity D1 of the fourth filter branch 16 is connected to the third port 32, and the seventh filter cavity D7 of the fourth filter branch 16 is connected to the second port 22; the first filter cavity E1 of the fifth filter branch 24 is connected to the sixth port, and the seventh filter cavity E7 of the fifth filter branch 17 is connected to the third port 32; the first filter cavity F1 of the sixth filter branch 18 is connected to the seventh port, and the seventh filter cavity F7 of the sixth filter branch 25 is connected to the third port 32.

The first port 12 to the seventh port may be taps of the filter 10.

The bandwidth of the first filtering branch 13 of the present embodiment is in the range of 360Mhz-367 Mhz. In particular, the coupling bandwidth between the first port 12 and the first filter cavity a1 of the first filter branch 13 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 13 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 13 ranges from-2 Mhz to 2 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the first filter branch 13 ranges from-1 Mhz to 4 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 13 ranges from-1 Mhz to 4 Mhz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity a6 of the first filter branch 13 ranges from-2 Mhz to 2 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 13 ranges from-1 Mhz to 4 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the sixth filter cavity a6 of the first filter branch 13 ranges from-3 Mhz to 2 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 13 ranges from-1 Mhz to 4 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 of the first filter branch 13 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the fourth port of the first filter branch 13 is in the range of 1Mhz-6 Mhz.

The bandwidth parameter of the third filtering branch 15 is consistent with the bandwidth parameter of the first filtering branch 13, and is not described herein again.

The bandwidth of the second filtering branch 14 of this embodiment lies in the range 335Mhz-357 Mhz. In particular, the coupling bandwidth between the first port 12 and the first filter cavity B1 of the second filter branch 14 ranges from 15Mhz to 21 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 of the second filter branch 14 ranges from 10Mhz to 16 Mhz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 14 ranges from 5Mhz to 10 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 of the second filter branch 14 ranges from 6Mhz to 11 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 of the second filter branch 14 ranges from 7Mhz to 13 Mhz; the coupling bandwidth between the third filter cavity B3 and the sixth filter cavity B6 of the second filter branch 14 ranges from-2 Mhz-3 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 14 ranges from 5Mhz to 10 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 14 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 of the second filter branch 14 ranges from 6Mhz to 11 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 of the second filter branch 14 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the seventh filter cavity B7 of the second filter branch 14 and the third port 32 ranges from 15Mhz to 21 Mhz.

The bandwidth parameter of the fourth filtering branch 16 is consistent with the bandwidth parameter of the second filtering branch 14, and is not described herein again.

The bandwidth of the fifth filtering branch 17 of this embodiment lies in the range 335Mhz-357 Mhz. In particular, the coupling bandwidth between the sixth port and the first filter cavity E1 of the fifth filter branch 17 ranges from 15Mhz to 21 Mhz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 of the fifth filter branch 17 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 of the fifth filter branch 17 ranges from 7Mhz to 13 Mhz; the coupling bandwidth between the second filter cavity E2 and the fifth filter cavity E5 of the fifth filter branch 17 ranges from-1 Mhz to 4 Mhz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 of the fifth filter branch 17 ranges from 3Mhz to 8 Mhz; the coupling bandwidth between the third filter cavity E3 and the fifth filter cavity E5 of the fifth filter branch 17 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 of the fifth filter branch 17 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 17 ranges from 7Mhz to 13 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the seventh filter cavity E7 of the fifth filter branch 17 ranges from 2Mhz to 7 Mhz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 of the fifth filter branch 17 ranges from 11Mhz to 17 Mhz; the coupling bandwidth between the seventh filter cavity E7 of the fifth filter branch 17 and the third port 32 ranges from 15Mhz to 21 Mhz.

The bandwidth parameter of the sixth filtering branch 18 is consistent with the bandwidth parameter of the fifth filtering branch 17, and is not described herein again.

Therefore, the resonant frequencies of the first filter cavity a1 through the seventh filter cavity a7 of the first filter branch 13 are sequentially located in the following ranges: 362Mhz-364Mhz, 361Mhz-363Mhz, 362Mhz-364 Mhz.

The frequency parameter of the third filtering branch 15 is consistent with the frequency parameter of the first filtering branch 13, and is not described herein again.

The resonant frequencies of the first filter cavity B1 through the seventh filter cavity B7 of the second filter branch 14 are in the following ranges in sequence: 344Mhz-346Mhz, 350Mhz-352Mhz, 343Mhz-345Mhz, 344Mhz-346Mhz, 351Mhz-353Mhz, 344Mhz-346Mhz, and 344Mhz-346 Mhz.

The frequency parameter of the fourth filtering branch 16 is consistent with the frequency parameter of the second filtering branch 14, and is not described herein again.

The resonant frequencies of the first filter cavity E1 through the seventh filter cavity E7 of the fifth filter branch 17 are sequentially in the following ranges: 344Mhz-346Mhz, 345Mhz-347Mhz, 352Mhz-354Mhz, 344Mhz-346Mhz, 348Mhz-350Mhz, and 344Mhz-346 Mhz.

The frequency parameter of the sixth filtering branch 18 is consistent with the frequency parameter of the fifth filtering branch 17, and is not described herein again.

It can be seen that the resonant frequencies of the first filtering branch 13 to the sixth filtering branch 18 are substantially identical, wherein the resonant frequencies of the filtering cavities of the first filtering branch 13 and the third filtering branch 15 are completely identical; the resonant frequencies of the filter cavities of the second filter branch 14 and the fourth filter branch 16 are completely consistent; the resonance frequencies of the filter cavities of the fifth filter branch 17 and the sixth filter branch 18 are completely consistent; the convenience of manufacturing and debugging the filter 10 is improved, namely the filter can be manufactured by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 7, fig. 7 is a schematic diagram of a first simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the second filtering branch 14, the fourth filtering branch 16, the fifth filtering branch 17 and the sixth filtering branch 18 of the present application are in the range of 335Mhz-357Mhz, as shown by the frequency band curve 31 in fig. 7. The bandwidth rejection of band curve 31 is greater than or equal to 20dB over the frequency range 300Mhz-328Mhz, the bandwidth rejection of band curve 31 is greater than or equal to 10dB over the frequency range 328Mhz-330Mhz, and the bandwidth rejection of band curve 31 is greater than or equal to 70dB over the frequency range 361Mhz-470 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 31 in fig. 7, one inductive cross-coupling zero 141 of the second filtering branch 14 is zero a, and the frequency of the zero a is 360Mhz, where the bandwidth rejection is greater than 91 dB.

As shown in fig. 8, fig. 8 is a schematic diagram of a second simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the first filtering branch 13 and the third filtering branch 15 of the present application are in the range of 360Mhz-367Mhz, as shown by the frequency band curve 32 in fig. 8. The bandwidth rejection of the band curve 32 is greater than or equal to 105dB over the frequency range of 351Mhz-356Mhz, the bandwidth rejection of the band curve 32 is greater than or equal to 15dB over the frequency range of 356Mhz-358Mhz, the bandwidth rejection of the band curve 32 is greater than or equal to 15dB over the frequency range of 369Mhz-372Mhz, the bandwidth rejection of the band curve 32 is greater than or equal to 49dB over the frequency range of 372Mhz-379Mhz, the bandwidth rejection of the band curve 32 is greater than or equal to 25dB over the frequency range of 379Mhz-460 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 32 in fig. 8, one cross-coupling zero point 131 of the first filtering branch 13 is zero point B, and the frequency of the zero point B is 358Mhz, where the bandwidth rejection is greater than 123 dB.

It should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameters are shown as the same coupling zeros.

Therefore, the filter 10 of the present application can reduce the size of the filter 10 and improve the performance of the filter 10 such as out-of-band rejection.

The present application further provides a communication device, as shown in fig. 9, fig. 9 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device 40 of the present embodiment includes an antenna 41 and a radio frequency unit 42 connected to the antenna 41, the radio frequency unit 42 includes the filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering the radio frequency signal. In other embodiments, the rf Unit 42 may be integrally designed with the Antenna 41 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters, and it is understood that in other embodiments, the present application may also be a combiner, i.e., a dual-frequency combiner.

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

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

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

2. The filter of claim 1,

the first filtering cavity to the third filtering cavity of the first filtering branch circuit are arranged in a triangular shape, the projection of the center of the third filtering cavity in the first direction is positioned between the center of the first filtering cavity and the projection of the center of the second filtering cavity in the first direction, and the projection of the center of the first filtering cavity in the second direction is positioned between the center of the second filtering cavity and the projection of the center of the third filtering cavity in the second direction;

the third filtering cavities and the sixth filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;

the fourth filtering cavity to the sixth filtering cavity of the first filtering branch are arranged in a triangular shape, the projection of the center of the sixth filtering cavity in the first direction is positioned between the center of the fourth filtering cavity and the projection of the center of the fifth filtering cavity in the first direction, and the projection of the center of the fifth filtering cavity in the second direction is positioned between the center of the fourth filtering cavity and the projection of the center of the sixth filtering cavity in the second direction;

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

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

the third filter cavity of the second filter branch is respectively adjacent to the first filter cavity, the second filter cavity, the fourth filter cavity and the fourth filter cavity of the second filter branch;

the fourth filter cavity of the first filter branch is respectively adjacent to the third filter cavity, the fifth filter cavity, the sixth filter cavity and the fifth filter cavity of the second filter branch;

and a third filtering cavity of the second filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the seventh filtering cavity.

3. The filter of claim 2,

capacitive cross coupling is respectively performed between a first filtering cavity and a third filtering cavity of the first filtering branch, between a fourth filtering cavity and a sixth filtering cavity of the first filtering branch, and inductive cross coupling is performed between the third filtering cavity and the sixth filtering cavity of the first filtering branch, so that three cross coupling zeros of the first filtering branch are formed;

and the first filtering cavity and the third filtering cavity, the third filtering cavity and the sixth filtering cavity, and the fourth filtering cavity and the sixth filtering cavity of the second filtering branch are inductively and cross-coupled respectively to form three inductive cross-coupling zeros of the second filtering branch.

4. The filter of claim 3, further comprising:

the second port is respectively coupled with a third filtering branch and a fourth filtering branch which are arranged on the shell;

the third filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the third filtering branch further form three cross-coupling zeros;

the fourth filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the fourth filtering branch further form three inductive cross-coupling zeros.

5. The filter of claim 4,

the first filtering cavity to the third filtering cavity of the third filtering branch circuit are arranged in a triangular shape, the projection of the center of the second filtering cavity in the first direction is positioned between the center of the first filtering cavity and the projection of the center of the third filtering cavity in the first direction, and the projection of the center of the first filtering cavity in the second direction is positioned between the center of the second filtering cavity and the projection of the center of the third filtering cavity in the second direction;

the third filtering cavities and the sixth filtering cavities of the third filtering branch are in a row and are sequentially arranged along the first direction;

a fourth filtering cavity to a sixth filtering cavity of the third filtering branch are arranged in a triangular shape, the projection of the center of the sixth filtering cavity in the first direction is positioned between the center of the fourth filtering cavity and the projection of the center of the fifth filtering cavity in the first direction, and the projection of the center of the fourth filtering cavity in the second direction is positioned between the center of the fifth filtering cavity and the projection of the center of the sixth filtering cavity in the second direction;

the first filtering cavity to the third filtering cavity of the fourth filtering branch circuit are arranged in a triangular shape, the projection of the center of the first filtering cavity in the first direction is positioned between the projection of the center of the second filtering cavity and the projection of the center of the third filtering cavity in the first direction, and the projection of the center of the second filtering cavity in the second direction is positioned between the projection of the center of the first filtering cavity and the projection of the center of the third filtering cavity in the second direction;

the third filtering cavities and the fourth filtering cavities of the fourth filtering branch are in a row and are sequentially arranged along the first direction;

the seventh filtering cavity, the sixth filtering cavity and the fifth filtering cavity of the fourth filtering branch are in a row and are sequentially arranged along the first direction;

a sixth filtering cavity of the third filtering branch is respectively adjacent to the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the seventh filtering cavity;

the first filter cavity of the third filter branch is respectively adjacent to the second filter cavity, and the first filter cavity and the fourth filter cavity of the fourth filter branch;

a fourth filter cavity of the third filter branch is respectively adjacent to a third filter cavity, a fifth filter cavity, a sixth filter cavity and a fourth filter cavity of the first filter branch;

a third filter cavity of the fourth filter branch is respectively adjacent to the first filter cavity, the second filter cavity, the fourth filter cavity, the sixth filter cavity and the seventh filter cavity;

and the fifth filter cavity of the fourth filter branch is further arranged adjacent to the fifth filter cavity of the second filter branch.

6. The filter of claim 5,

capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the third filtering branch and between the fourth filtering cavity and the sixth filtering cavity of the third filtering branch, and inductive cross coupling is performed between the third filtering cavity and the sixth filtering cavity to form three cross coupling zeros of the third filtering branch;

and the first filtering cavity and the third filtering cavity, the third filtering cavity and the sixth filtering cavity, and the fourth filtering cavity and the sixth filtering cavity of the fourth filtering branch are inductively and cross-coupled respectively to form three inductive cross-coupling zeros of the fourth filtering branch.

7. The filter of claim 6, further comprising:

the third port is respectively coupled with a second filtering branch, a fourth filtering branch, a fifth filtering branch and a sixth filtering branch which are arranged on the shell;

the fifth filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the fifth filtering branch further form three inductive cross-coupling zeros;

the sixth filtering branch consists of seven filtering cavities which are coupled in sequence, and the seven filtering cavities of the sixth filtering branch further form three inductive cross-coupling zeros.

8. The filter of claim 7,

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

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

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

the third filtering cavities and the fourth filtering cavities of the sixth filtering branch are in a row and are sequentially arranged along the first direction;

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

the seventh filtering cavities and the sixth filtering cavities of the sixth filtering branch are in a row and are sequentially arranged along the first direction;

the second filtering cavity, the third filtering cavity and the fifth filtering cavity of the sixth filtering branch are arranged in a triangular shape, the projection of the center of the third filtering cavity in the first direction is positioned between the center of the second filtering cavity and the projection of the center of the fifth filtering cavity in the first direction, and the projection of the center of the second filtering cavity in the second direction is positioned between the center of the third filtering cavity and the projection of the center of the fifth filtering cavity in the second direction;

a seventh filtering cavity of the fifth filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the fifth filtering cavity and the sixth filtering cavity;

a fourth filter cavity of the fifth filter branch is respectively adjacent to a third filter cavity, the fifth filter cavity, and the first filter cavity and the second filter cavity of the second filter branch;

the second filtering cavity, the third filtering cavity, the sixth filtering cavity, the seventh filtering cavity of the fifth filtering branch, and the second filtering cavity and the fourth filtering cavity of the second filtering branch are arranged in a regular hexagon;

a sixth filtering cavity of the sixth filtering branch is respectively adjacent to the second filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the seventh filtering cavity of the fourth filtering branch;

and a fourth filter cavity of the sixth filter branch is respectively adjacent to the third filter cavity, the fifth filter cavity and the second filter cavity of the fourth filter branch.

9. The filter of claim 8,

inductive cross coupling is respectively performed between a second filtering cavity and a fifth filtering cavity, between a third filtering cavity and a fifth filtering cavity and between the fifth filtering cavity and a seventh filtering cavity of the fifth filtering branch so as to form three inductive cross coupling zeros of the fifth filtering branch;

and the second filtering cavity, the third filtering cavity and the fifth filtering cavity, and the fifth filtering cavity and the seventh filtering cavity of the sixth filtering branch are inductively and cross-coupled respectively to form three inductive cross-coupling zeros of the sixth filtering branch.

10. A communication device, comprising a terminal and a base station, wherein the base station comprises a base station antenna and a radio frequency unit connected to the base station antenna, and wherein the radio frequency unit comprises a filter according to any one of claims 1 to 9, and wherein the filter is configured to filter a radio frequency signal.