CN113054374A

CN113054374A - Communication device and filter

Info

Publication number: CN113054374A
Application number: CN201911383507.9A
Authority: CN
Inventors: 李华; 李佳琦; 王磊; 刘学鑫
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The application discloses a communication device and a filter, wherein the filter comprises a shell, a first common cavity, a first filtering branch and a second filtering branch, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other; the first common cavity is arranged on the shell, the first filtering branch is coupled with the first common cavity and consists of ten filtering cavities which are sequentially coupled, and four cross-coupling zeros of the first filtering branch are formed; the second filtering branch is coupled with the first common cavity and consists of seven filtering cavities which are sequentially coupled to form three cross-coupling zeros of the first filtering branch; the size of the filter cavity of the first filter branch is larger than that of the filter cavity of the second filter branch; seven filter cavities of the second filter branch are arranged in a trapezoid shape. In this way, this application is through being provided with first filtering branch road and second filtering branch road and first public chamber coupling to make first filtering branch road and second filtering branch road share and take a percentage, reduce the quantity of taking a percentage, reduce cost reduces the volume of wave filter.

Description

Communication device and filter

Technical Field

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

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 accurately control its upper and lower limit frequencies. And should also consider maintaining high isolation between the passbands of the channels if both transmit and receive channels are present.

The inventor of this application discovers in long-term research and development work that present wave filter is provided with first filtering branch road and second filtering branch road, and first filtering branch road and second filtering branch road all independently are provided with input and output to the quantity that makes the tap is big, occupy the space of wave filter, lead to the bulky of wave filter, it is with high costs.

Disclosure of Invention

The application provides a communication equipment and a filter to solve the problems of large size and high cost of the filter in the prior art.

In order to solve the technical problem, the application adopts a technical scheme that: providing a filter, the filter comprising: a housing having a first direction and a second direction perpendicular to each other; a first common chamber disposed on the housing; the first filtering branch is coupled with the first common cavity, consists of ten filtering cavities which are sequentially coupled and forms four cross-coupling zeros of the first filtering branch; the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled and forms three cross-coupling zeros of the first filtering branch; the size of the filter cavity of the first filter branch is larger than that of the filter cavity of the second filter branch; seven filter cavities of the second filter branch are arranged in a trapezoid shape.

Furthermore, the seven filter cavities of the second filter branch are divided into two rows arranged along the first direction, and the first filter cavity of the second filter branch is coupled with the first common cavity; the first filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the second filtering branch are in a row and are sequentially arranged along the second direction; and 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 sequentially arranged along the second direction. The filtering cavities are regularly arranged, so that the volume of the cavity can be saved.

Furthermore, a first filtering cavity of the first filtering branch is coupled with the first common cavity, and the first filtering cavity and a second filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction; the third filter cavity and the fourth filter cavity of the first filter branch approach to the middle branching line of the shell in the first direction relative to the second 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 second filter cavity of the first filter branch and the middle branching line is an acute angle, a second included angle between a connecting line of the center of the fourth filter cavity and the center of the third filter cavity of the first filter branch and the middle branching line is an acute angle, and the second included angle is larger than the first included angle; the third filtering cavity to the fifth filtering cavity of the first filtering branch are arranged in a triangular shape, and the fourth filtering cavity to the tenth filtering cavity of the first filtering branch are divided into three rows which are sequentially arranged along the first direction; the fifth filtering cavities and the sixth filtering cavities of the first filtering branch are in a row and are sequentially arranged along the second direction; the fourth filtering cavity, the eighth filtering cavity and the seventh filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction; and the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction. The cavity of arranging of first filtering branch road is arranged regularly, can rationally utilize the inner space of arranging the cavity.

Furthermore, an eighth filtering cavity of the first filtering branch is respectively adjacent to a fourth filtering cavity, a fifth filtering cavity, a sixth filtering cavity, a seventh filtering cavity, a ninth filtering cavity and a tenth filtering cavity of the first filtering branch, and the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon; the sixth filtering cavity of the second filtering branch is respectively adjacent to the fourth filtering cavity, the fifth filtering cavity and the seventh filtering cavity of the second filtering branch and the second filtering cavity of the first filtering branch; and the first filter cavity of the second filter branch circuit is respectively adjacent to the second filter cavity, the third filter cavity and the fifth filter cavity of the second filter branch circuit, the first filter cavity of the first filter branch circuit and the first public cavity. The filter cavities of the first filter branch are all adjacently arranged and closely arranged, so that the size of the row cavity can be reduced.

Furthermore, capacitive cross coupling is respectively performed between a third filter cavity and a fifth filter cavity of the first filter branch, and between an eighth filter cavity and a tenth filter cavity of the first filter branch, and inductive cross coupling is respectively performed between the fifth filter cavity and the eighth filter cavity of the first filter branch, and between a sixth filter cavity and the eighth filter cavity of the first filter branch, so as to form four cross coupling zeros of the first filter branch; capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the second filtering branch circuit and between the fourth filtering cavity and the sixth filtering cavity of the second filtering branch circuit, and inductive cross coupling is performed between the fourth filtering cavity and the seventh filtering cavity of the second filtering branch circuit, so that three cross coupling zeros of the second filtering branch circuit are formed. The capacitive coupling zero point is realized by a capacitive cross coupling element which can be a flying bar; the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the filter is avoided.

Further, the filter includes: a second common chamber spaced from the first common chamber on the housing; the third filtering branch is coupled with the second common cavity and consists of ten filtering cavities which are sequentially coupled to form four cross-coupling zeros of the third filtering branch; and the fourth filtering branch is coupled with the second common cavity and consists of seven filtering cavities which are sequentially coupled to form three cross-coupling zeros of the fourth filtering branch.

Furthermore, a fourth filtering cavity to a tenth filtering cavity of the third filtering branch and the fourth filtering cavity to the tenth filtering cavity of the first filtering branch are symmetrically arranged; the first filtering cavities and the second common cavities of the third filtering branch are in a row and are sequentially arranged along the second direction; a second filter cavity and a third filter cavity of the third filter branch approach to the branch line relative to a first filter cavity of the third filter branch, a third included angle between a connecting line of a center of the second filter cavity of the third filter branch and a center of the first filter cavity and the branch line is an acute angle, a fourth included angle between a connecting line of a center of the third filter cavity of the third filter branch and a center of the second filter cavity and the branch line is an acute angle, and the fourth included angle is larger than the third included angle; the second filtering cavity to the fourth filtering cavity of the third filtering branch are arranged in a triangular mode, the fourth filtering cavity of the third filtering branch is opposite to the third filtering cavity of the third filtering branch towards the middle branch, and a connecting line between the center of the second filtering cavity of the third filtering branch and the center of the fourth filtering cavity and a fifth included angle between the middle branches are acute angles. Because the fourth filtering cavity to the tenth filtering cavity of the third filtering branch circuit and the fourth filtering cavity to the tenth filtering cavity of the first filtering branch circuit are symmetrically arranged, the third filtering cavity and the tenth filtering cavity are adjacently arranged and closely arranged, and the size of the row cavity can be reduced.

Furthermore, seven filter cavities of the fourth filter branch are divided into two rows which are sequentially arranged along the first direction; the first filter cavity of the fourth filter branch is coupled with the second common cavity; the first filtering cavity, the fourth filtering cavity and the seventh filtering cavity of the fourth filtering branch are in a row and are sequentially arranged along the second direction; and the second filtering cavity, the third filtering cavity, the fifth filtering cavity and the eighth filtering cavity of the fourth filtering branch are in a row and are sequentially arranged along the second direction. The fourth filtering branches are uniformly distributed, so that the volume of the discharge cavity can be reduced.

Furthermore, capacitive cross coupling is respectively performed between a second filter cavity and a fourth filter cavity of the third filter branch, and between an eighth filter cavity and a tenth filter cavity of the third filter branch, and inductive cross coupling is performed between a fifth filter cavity and an eighth filter cavity of the third filter branch, and between a sixth filter cavity and an eighth filter cavity of the third filter branch, so as to form four cross coupling zeros of the third filter branch; capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the fourth filtering branch and between the fifth filtering cavity and the seventh filtering cavity of the fourth filtering branch, and inductive cross coupling is performed between the fourth filtering cavity and the seventh filtering cavity of the fourth filtering branch, so that three cross coupling zeros of the fourth filtering branch are formed. The capacitive coupling zero point is realized by a capacitive cross coupling element which can be a flying bar; the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the filter is avoided.

In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a communication apparatus including the above filter and a communication base station that transceives a radio frequency signal through the filter.

The beneficial effect of this application is: different from the situation of the prior art, the first filtering branch and the second filtering branch are coupled with the first common cavity, so that the first filtering branch and the second filtering branch share taps, the number of taps is reduced, the cost is reduced, and the size of the filter is reduced; in addition, seven filter chambers of the second filter branch are in trapezoidal arrangement, and the filter chambers of the second filter branch are regularly distributed and closely arranged, so that the volume of the discharge chamber is further reduced.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a filter according to the present application;

FIG. 2 is a schematic of the topology of the first filtering branch of the filter shown in FIG. 1;

FIG. 3 is a schematic of the topology of the second filtering branch of the filter shown in FIG. 1;

FIG. 4 is a schematic of the topology of the third filtering branch of the filter shown in FIG. 1;

FIG. 5 is a schematic of the topology of the fourth filtering branch of the filter shown in FIG. 1;

FIG. 6 is a diagram illustrating simulation results of a first filtering branch and a third filtering branch of the filter of the embodiment of FIG. 1;

FIG. 7 is a diagram illustrating simulation results of the second filtering branch and the fourth filtering branch of the filter of the embodiment of FIG. 1;

fig. 8 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 invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of 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 invention.

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.

The present application provides a filter 91, as shown in fig. 1 to 8, wherein fig. 1 is a schematic structural diagram of an embodiment of the filter 91 of the present application; fig. 2 is a schematic diagram of the topology of the first filtering branch 30 of the filter 91 shown in fig. 1; fig. 3 is a schematic of the topology of the second filtering branch 40 of the filter 91 shown in fig. 1; fig. 4 is a schematic of the topology of the third filtering branch 50 of the filter 91 shown in fig. 1; fig. 5 is a schematic of the topology of the fourth filtering branch 60 of the filter 91 shown in fig. 1; fig. 6 is a diagram illustrating simulation results of the first filtering branch 30 and the third filtering branch 50 of the filter 91 of the embodiment of fig. 1; fig. 7 is a diagram illustrating simulation results of the second filtering branch 40 and the fourth filtering branch 60 of the filter 91 of the embodiment of fig. 1; fig. 8 is a schematic structural diagram of an embodiment of a communication device 90 provided in the present application.

Wherein the filter 91 in one embodiment comprises a housing 10, a first common cavity 20, a first filter branch 30 and a second filter branch 40. Wherein the housing 10 has a first direction L and a second direction D perpendicular to each other; the first common chamber 20 is provided on the housing 10; the first filtering branch 30 is coupled with the first common cavity 20, and consists of ten filtering cavities which are sequentially coupled to form four cross-coupling zeros of the first filtering branch 30; the second filtering branch 40 is coupled with the first common cavity 20, and consists of seven filtering cavities which are sequentially coupled to form three cross-coupling zeros of the first filtering branch 30; the size of the filter cavity of the first filter branch 30 is larger than that of the filter cavity of the second filter branch 40; the seven filter cavities of the second filter branch 40 are arranged in a trapezoid. The first filtering branch 30 and the second filtering branch 40 are coupled with the first common cavity 20, so that the first filtering branch 30 and the second filtering branch 40 share taps, the number of taps is reduced, the cost is reduced, and the size of the filter is reduced; in addition, seven filter cavities of the second filter branch 40 are in a trapezoidal arrangement, and the filter cavities of the second filter branch 40 are regularly distributed and closely arranged, so that the volume of the row cavity is further reduced.

The seven filter cavities of the second filter branch 40 are divided into two rows arranged along the first direction L, the first filter cavity B1 of the second filter branch 40 being coupled to the first common cavity 20; the first filtering cavity B1, the fifth filtering cavity B5 and the sixth filtering cavity B6 of the second filtering branch 40 are in a row and are sequentially arranged along the second direction D; 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 40 are in a row and are sequentially arranged along the second direction D.

The first filter cavity a1 of the first filter branch 30 is coupled to the first common cavity 20, and the first filter cavity a1 and the second filter cavity a2 of the first filter branch 30 are in a row and are sequentially arranged along the second direction D; the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 30 are close to the midline of the housing 10 in the first direction L relative to the second filter cavity a2 of the first filter branch 30, a first included angle between a connecting line of the center of the third filter cavity A3 of the first filter branch 30 and the center of the second filter cavity a2 and the midline is an acute angle, a second included angle between a connecting line of the center of the fourth filter cavity a4 of the first filter branch 30 and the center of the third filter cavity A3 and the midline is an acute angle, and the second included angle is greater than the first included angle; the third filtering cavity A3 to the fifth filtering cavity a5 of the first filtering branch 30 are arranged in a triangle, and the fourth filtering cavity a4 to the tenth filtering cavity a10 of the first filtering branch 30 are divided into three rows arranged in sequence along the first direction L; the fifth filtering cavity a5 and the sixth filtering cavity a6 of the first filtering branch 30 are in a row and are sequentially arranged along the second direction D; the fourth filtering cavity a4, the eighth filtering cavity A8 and the seventh filtering cavity a7 of the first filtering branch 30 are in a row and are sequentially arranged along the second direction D; the ninth filter cavity a9 and the tenth filter cavity a10 of the first filter branch 30 are in a row and are sequentially arranged along the second direction D. The first filtering cavity A1 to the tenth filtering cavity A10 of the first filtering branch 30 are uniformly distributed, so that the volume of the discharge cavity can be reduced, and the production cost is reduced.

The eighth filtering cavity A8 of the first filtering branch 30 is respectively adjacent to the fourth filtering cavity a4, the fifth filtering cavity a5, the sixth filtering cavity A6, the seventh filtering cavity a7, the ninth filtering cavity a9 and the tenth filtering cavity a10 of the first filtering branch 30, and the fourth filtering cavity a4, the fifth filtering cavity a5, the sixth filtering cavity A6, the seventh filtering cavity a7, the ninth filtering cavity a9 and the tenth filtering cavity a10 of the first filtering branch 30 are arranged in a regular hexagon; the sixth filtering cavity B6 of the second filtering branch 40 is respectively adjacent to the fourth filtering cavity B4, the fifth filtering cavity B5 and the seventh filtering cavity B7 of the second filtering branch 40, and the second filtering cavity a2 of the first filtering branch 30; the first filter cavity B1 of the second filter branch 40 is respectively adjacent to the second filter cavity B2, the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 40, the first filter cavity a1 of the first filter branch 30 and the first common cavity 20.

Capacitive cross coupling is respectively performed between the third filtering cavity A3 and the fifth filtering cavity a5 of the first filtering branch 30, between the eighth filtering cavity A8 and the tenth filtering cavity a10 of the first filtering branch 30, between the fifth filtering cavity a5 and the eighth filtering cavity A8 of the first filtering branch 30, and between the sixth filtering cavity a6 and the eighth filtering cavity A8 of the first filtering branch 30, so as to form four cross coupling zeros of the first filtering branch 30; capacitive cross coupling is respectively performed between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 40 and between the fourth filter cavity B4 and the sixth filter cavity B6, and inductive cross coupling is performed between the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 40, so that three cross-coupling zeros of the second filter branch 40 are formed. The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved. Generally, the capacitive coupling zero point is realized by a capacitive cross-coupling element, and a common capacitive cross-coupling element may be a flying bar; the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is slightly changed by the external temperature, so that the temperature drift of the filter 91 is avoided.

Optionally, the housing 10 is further provided with a first port (not shown), a second port (not shown) and a third port (not shown), the first common cavity 20 is connected with the first port, the tenth filtering cavity a10 of the first filtering branch 30 is connected with the second port, and the seventh filtering cavity B7 of the second filtering branch 40 is connected with the third port. Wherein the first port, the second port and the third port are all taps.

The first filtering branch 30 is a transmitting filtering branch, and the second filtering branch 40 is a receiving filtering branch.

The bandwidth of the first filtering branch 30 lies in: 791MHz-821 MHz. Specifically, the coupling bandwidth between the first common cavity 20 and the first filtering cavity a1 of the first filtering branch 30 is 25MHz-32 MHz; the coupling bandwidth between the first filter cavity a1 of the first filter branch 30 and the second filter cavity a2 of the first filter branch 30 is 21KHz-27 MHz; the coupling bandwidth between the second filter cavity a2 of the first filter branch 30 and the third filter cavity A3 of the first filter branch 30 is 14KHz-20 MHz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 30 and the fourth filter cavity a4 of the first filter branch 30 is 12KHz-17 MHz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 30 and the fifth filter cavity a5 of the first filter branch 30 is 3MHz-8 MHz; the coupling bandwidth between the fourth filter cavity a4 of the first filter branch 30 and the fifth filter cavity a5 of the first filter branch 30 is 12MHz-17 MHz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 30 and the sixth filter cavity a6 of the first filter branch 30 is 12MHz-17 MHz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 30 and the eighth filter cavity A8 of the first filter branch 30 is (-4) MHz- (-1) KHz; the coupling bandwidth between the sixth filter cavity a6 of the first filter branch 30 and the seventh filter cavity a7 of the first filter branch 30 is 13MHz-19 MHz; the coupling bandwidth between the sixth filtering cavity a6 of the first filtering branch 30 and the eighth filtering cavity A8 of the first filtering branch 30 is (-9) MHz- (-5) MHz; the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 30 and the eighth filter cavity A8 of the first filter branch 30 is 11MHz-16 MHz; the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 30 and the ninth filter cavity a9 of the first filter branch 30 is 13MHz-19 MHz; the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 30 and the tenth filter cavity a10 of the first filter branch 30 is 4MHz-9 MHz; the coupling bandwidth between the ninth filter cavity a9 of the first filter branch 30 and the tenth filter cavity a10 of the first filter branch 30 is 20MHz-26 MHz; the coupling bandwidth between the tenth filter cavity a10 of the first filter branch 30 and the second port is 20MHz-25 MHz. The value of the External Quality factor (External Quality Factors) between the first port and the first filter cavity a1 of the first filter branch 30 is 26.76, and the value of the External Quality factor (External Quality Factors) between the tenth filter cavity a10 of the first filter branch 30 and the second port is 26.76. Therefore, the bandwidth of the first filtering branch 30 of the filter 91 of the present embodiment is between 791MHz and 821MHz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity a1 through the tenth filter cavity a10 of the first filter branch 30 are sequentially in the following ranges: 805MHz-807MHz, 811MHz-813MHz, 805MHz-807MHz, 807MHz-809MHz, 798MHz-800MHz, 804MHz-806MHz, 810MHz-810MHz, and 805MHz-807 MHz.

The bandwidth of the second filtering branch 40 lies in the range 832MHz-862 MHz. Specifically, the coupling bandwidth between the first common cavity 20 and the first filter cavity B1 of the second filter branch 40 is 26MHz-33MHz, and the coupling bandwidth between the first filter cavity B1 of the second filter branch 40 and the second filter cavity B2 of the second filter branch 40 is 20MHz-25 MHz; the coupling bandwidth between the first filter cavity B1 of the second filter branch 40 and the third filter cavity B3 of the second filter branch 40 is (-10) MHz- (-7) MHz; the coupling bandwidth between the second filter cavity B2 of the second filter branch 40 and the third filter cavity B3 of the second filter branch 40 is 12MHz-18 MHz; the coupling bandwidth between the third filter cavity B3 of the second filter branch 40 and the fourth filter cavity B4 of the second filter branch 40 is 13MHz-19 MHz; the coupling bandwidth between the fourth filter cavity B4 of the second filter branch 40 and the fifth filter cavity B5 of the second filter branch 40 is 11MHz-16 MHz; the coupling bandwidth between the fourth filter cavity B4 of the second filter branch 40 and the sixth filter cavity B6 of the second filter branch 40 is (-11) MHz- (-8) MHz; the coupling bandwidth between the fourth filter cavity B4 of the second filter branch 40 and the seventh filter cavity B7 of the second filter branch 40 is 1MHz-5 MHz; the coupling bandwidth between the fifth filter cavity B5 of the second filter branch 40 and the sixth filter cavity B6 of the second filter branch 40 is 11MHz-16 MHz; the coupling bandwidth between the fifth filter cavity B5 of the second filter branch 40 and the seventh filter cavity B7 of the second filter branch 40 is 21MHz-27 MHz; the coupling bandwidth between the sixth filter cavity B6 of the second filter branch 40 and the seventh filter cavity B7 of the second filter branch 40 is 21MHz-27 MHz; the coupling bandwidth between the seventh filter cavity B7 of the second filter branch 40 and the third port is 26MHz-33 MHz. The value of the External Quality Factors (External Quality Factors) between the first common cavity 20 and the first filter cavity B1 of the second filter branch 40 is 27.34, and the value of the External Quality Factors (External Quality Factors) between the third ports of the seventh filter cavity B7 of the second filter branch 40 is 27.34. Therefore, the bandwidth of the second filtering branch 40 of the filter 91 of this embodiment is located in 832MHz-862MHz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity B1 through the seventh filter cavity B7 of the second filter branch 40 are sequentially in the following ranges: 846MHz-848MHz, 840MHz-842MHz, 847MHz-849MHz, 837MHz-839MHz, 845MHz-847MHz and 902MHz-904 MHz.

The filter 91 includes: a second common chamber 70 spaced apart from the first common chamber 20 on the housing 10; the third filtering branch 50 is coupled with the second common cavity 70 and consists of ten filtering cavities which are sequentially coupled to form four cross-coupling zeros of the third filtering branch 50; and the fourth filtering branch 60 is coupled with the second common cavity 70 and consists of seven filtering cavities which are sequentially coupled to form three cross-coupling zeros of the fourth filtering branch 60.

The fourth filtering cavity C4 to the tenth filtering cavity C10 of the third filtering branch 50 are symmetrically arranged with the fourth filtering cavity a4 to the tenth filtering cavity a10 of the first filtering branch 30; the first filtering cavities C1 of the third filtering branch 50 and the second common cavity 70 are in a row and are sequentially arranged along the second direction D; the second filtering cavity C2 and the third filtering cavity C3 of the third filtering branch 50 draw close to the midline relative to the first filtering cavity C1 of the third filtering branch 50, a third included angle between a connecting line of the center of the second filtering cavity C2 of the third filtering branch 50 and the center of the first filtering cavity C1 and the midline is an acute angle, a fourth included angle between a connecting line of the center of the third filtering cavity C3 of the third filtering branch 50 and the center of the second filtering cavity C2 and the midline is an acute angle, and the fourth included angle is greater than the third included angle; the second filtering cavity C2 to the fourth filtering cavity C4 of the third filtering branch 50 are arranged in a triangle, the fourth filtering cavity C4 of the third filtering branch 50 is away from the third filtering cavity C3 of the third filtering branch 50 toward the midline, and a fifth included angle between a connecting line of the center of the second filtering cavity C2 and the center of the fourth filtering cavity C4 of the third filtering branch 50 and the midline is an acute angle.

The seven filter cavities of the fourth filter branch 60 are divided into two rows arranged in sequence along the first direction L; the first filter cavity D1 of the fourth filter branch 60 is coupled to the second common cavity 70; the first filtering cavity D1, the fourth filtering cavity D4 and the seventh filtering cavity D7 of the fourth filtering branch 60 are in a row and are sequentially arranged along the second direction D; the second filter cavity D2, the third filter cavity D3, the fifth filter cavity D5 and the eighth filter cavity D8 of the fourth filter branch 60 are in a row and are sequentially arranged along the second direction D. The first filtering cavity D1 to the seventh filtering cavity D7 of the fourth filtering branch 60 are uniformly arranged and tightly connected, so that the volume of the row cavity can be reduced.

Capacitive cross coupling is respectively performed between the second filtering cavity C2 and the fourth filtering cavity C4, between the eighth filtering cavity C8 and the tenth filtering cavity C10 of the third filtering branch 50, inductive cross coupling is performed between the fifth filtering cavity C5 and the eighth filtering cavity C8, and between the sixth filtering cavity C6 and the eighth filtering cavity C8 of the third filtering branch 50, so that four cross coupling zeros of the third filtering branch 50 are formed; capacitive cross coupling is respectively performed between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 60 and between the fifth filter cavity D5 and the seventh filter cavity D7 of the fourth filter branch 60, and inductive cross coupling is performed between the fourth filter cavity D4 and the seventh filter cavity D7 of the fourth filter branch 60, so as to form three cross-coupling zeros of the fourth filter branch 60. Zero point suppression can be realized by the cross coupling zero point, and the production cost is reduced. Generally, the capacitive coupling zero point is realized by a capacitive cross-coupling element, and a common capacitive cross-coupling element may be a flying bar; the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is slightly changed by the external temperature, so that the temperature drift of the filter 91 is avoided.

Optionally, the housing 10 is further provided with a fourth port (not shown), a fifth port (not shown) and a sixth port (not shown), the second common cavity 70 is connected to the fourth port, the tenth filtering cavity C10 of the third filtering branch 50 is connected to the fifth port, and the seventh filtering cavity D7 of the fourth filtering branch 60 is connected to the sixth port.

The third filtering branch 50 is a transmitting filtering branch, and the fourth filtering branch 60 is a receiving filtering branch.

The bandwidth of the third filtering branch 50 lies in: 791MHz-821 MHz. Specifically, the coupling bandwidth between the second common cavity 70 and the first filtering cavity C1 of the third filtering branch 50 is 25MHz-32 MHz; the coupling bandwidth between the first filter cavity C1 of the third filter branch 50 and the second filter cavity C2 of the third filter branch 50 is 21KHz-27 MHz; the coupling bandwidth between the second filter cavity C2 of the third filter branch 50 and the third filter cavity C3 of the third filter branch 50 is 12KHz-18 MHz; the coupling bandwidth between the second filter cavity C2 of the third filter branch 50 and the fourth filter cavity C4 of the third filter branch 50 is 4KHz-9 MHz; the coupling bandwidth between the third filter cavity C3 of the third filter branch 50 and the fourth filter cavity C4 of the third filter branch 50 is 12KHz-17 MHz; the coupling bandwidth between the fourth filter cavity C4 of the third filter branch 50 and the fifth filter cavity C5 of the third filter branch 50 is 12MHz-18 MHz; the coupling bandwidth between the fifth filter cavity C5 of the third filter branch 50 and the sixth filter cavity C6 of the third filter branch 50 is 12MHz-17 MHz; the coupling bandwidth between the fifth filter cavity C5 of the third filter branch 50 and the eighth filter cavity C8 of the third filter branch 50 is (-4) MHz- (-1) KHz; the coupling bandwidth between the sixth filter cavity C6 of the third filter branch 50 and the seventh filter cavity C7 of the third filter branch 50 is 13MHz-19 MHz; the coupling bandwidth between the sixth filtering cavity C6 of the third filtering branch 50 and the eighth filtering cavity C8 of the third filtering branch 50 is (-8) MHz- (-5) MHz; the coupling bandwidth between the seventh filter cavity C7 of the third filter branch 50 and the eighth filter cavity C8 of the third filter branch 50 is 11MHz-16 MHz; the coupling bandwidth between the eighth filter cavity C8 of the third filter branch 50 and the ninth filter cavity C9 of the third filter branch 50 is 13MHz-19 MHz; the coupling bandwidth between the eighth filtering cavity C8 of the third filtering branch 50 and the tenth filtering cavity C10 of the third filtering branch 50 is 4MHz-9 MHz; the coupling bandwidth between the ninth filtering cavity C9 of the third filtering branch 50 and the tenth filtering cavity C10 of the third filtering branch 50 is 20MHz-26 MHz; the coupling bandwidth between the tenth filtering cavity C10 of the third filtering branch 50 and the fifth port is 25MHz-32 MHz. Wherein, the value of the External Quality Factors (External Quality Factors) between the second common cavity 70 and the first filter cavity C1 of the third filter branch 50 is 26.76, and the value of the External Quality Factors (External Quality Factors) between the tenth filter cavity C10 of the third filter branch 50 and the fifth port is 26.76. Therefore, the bandwidth of the third filtering branch 50 of the filter 91 of the present embodiment is between 791MHz and 821MHz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity C1 through the tenth filter cavity C10 of the third filter branch 50 are sequentially in the following ranges: 805MHz-807MHz, 811MHz-813MHz, 805MHz-807MHz, 807MHz-809MHz, 798MHz-800MHz, 804MHz-806MHz, 810MHz-810MHz, and 805MHz-807 MHz.

The bandwidth of the fourth filtering branch 60 lies in the range 832MHz-862 MHz. Specifically, the coupling bandwidth between the second common cavity 70 and the first filter cavity D1 of the fourth filter branch 60 is 26MHz-33MHz, and the coupling bandwidth between the first filter cavity D1 of the fourth filter branch 60 and the second filter cavity D2 of the fourth filter branch 60 is 20MHz-25 MHz; the coupling bandwidth between the first filter cavity D1 of the fourth filter branch 60 and the third filter cavity D3 of the fourth filter branch 60 is (-10) MHz- (-7) MHz; the coupling bandwidth between the second filter cavity D2 of the fourth filter branch 60 and the third filter cavity D3 of the fourth filter branch 60 is 12MHz-18 MHz; the coupling bandwidth between the third filter cavity D3 of the fourth filter branch 60 and the fourth filter cavity D4 of the fourth filter branch 60 is 13MHz-19 MHz; the coupling bandwidth between the fourth filter cavity D4 of the fourth filter branch 60 and the fifth filter cavity D5 of the fourth filter branch 60 is 13MHz-19 MHz; the coupling bandwidth between the fourth filter cavity D4 of the fourth filter branch 60 and the seventh filter cavity D7 of the fourth filter branch 60 is 1MHz-5 MHz; the coupling bandwidth between the fifth filter cavity D5 of the fourth filter branch 60 and the sixth filter cavity D6 of the fourth filter branch 60 is 9MHz-14 MHz; the coupling bandwidth between the fifth filter cavity D5 of the fourth filter branch 60 and the seventh filter cavity D7 of the fourth filter branch 60 is (-16) MHz- (-13) MHz; the coupling bandwidth between the sixth filter cavity D6 of the fourth filter branch 60 and the seventh filter cavity D7 of the fourth filter branch 60 is 16MHz-22 MHz; the coupling bandwidth between the seventh filter cavity D7 of the fourth filter branch 60 and the third port is 26MHz-33 MHz. The value of the External Quality Factors (External Quality Factors) between the second common cavity 70 and the first filter cavity D1 of the fourth filter branch 60 is 27.34, and the value of the External Quality Factors (External Quality Factors) between the seventh filter cavity D7 of the fourth filter branch 60 and the sixth port is 27.34. Therefore, the bandwidth of the fourth filtering branch 60 of the filter 91 of this embodiment is located in the range from 832MHz to 862MHz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity D1 through the seventh filter cavity D7 of the fourth filter branch 60 are sequentially in the following ranges: 846MHz-848MHz, 840MHz-842MHz, 847MHz-849MHz, 837MHz-839MHz, 845MHz-847MHz and 902MHz-904 MHz.

Fig. 6 is a diagram illustrating simulation results of the first filtering branch 30 and the third filtering branch 50 of the filter 91 of the embodiment of fig. 1; fig. 7 is a diagram illustrating simulation results of the second filtering branch 40 and the fourth filtering branch 60 of the filter 91 of the embodiment of fig. 1. Referring to the frequency band curve 100 and the frequency band curve 110, the test shows that the bandwidth suppression is greater than 35dB when the frequency is within the range of 716MHz to 782 MHz; when the frequency is within the range of 782 MHz-788 MHz, the bandwidth suppression is more than 25 dB; when the frequency is within the range of 788 MHz-789 MHz, the bandwidth inhibition is greater than 17 dB; when the frequency is within the range of 789 MHz-789.5 MHz, the bandwidth inhibition is greater than 10 dB; when the frequency is in the range of 789.5 MHz-790 MHz, the bandwidth inhibition is more than 3.5 dB; when the frequency is within the range of 832MHz to 862MHz, the bandwidth rejection is greater than 109 dB; when the frequency is in the range of 790 MHz-821MHz, the bandwidth inhibition is more than 75 dB; when the frequency is in the range of 882 MHz-921 MHz, the bandwidth rejection is greater than 20 dB. Therefore, the performance of the filter 91, such as out-of-band rejection, can be improved.

It is noted that the parameters 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.

As shown in fig. 8, the present application further provides a communication device 90, where the communication device 90 includes an antenna 93 and a radio frequency unit connected to the antenna 93, and the radio frequency unit includes the above-mentioned filter 91 for filtering a radio frequency signal. The embodiment of the present application is the filter 91, and may be a combiner, that is, a dual band combiner, or may be a duplexer in some other embodiments.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

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

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

a first common chamber disposed on the housing;

the first filtering branch is coupled with the first common cavity, consists of ten filtering cavities which are sequentially coupled and forms four cross-coupling zeros of the first filtering branch;

the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled and forms three cross-coupling zeros of the first filtering branch;

the size of the filter cavity of the first filter branch is larger than that of the filter cavity of the second filter branch; seven filter cavities of the second filter branch are arranged in a trapezoid shape.

2. The filter of claim 1,

seven filter cavities of the second filter branch are divided into two rows arranged along the first direction, and a first filter cavity of the second filter branch is coupled with the first common cavity;

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

and 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 sequentially arranged along the second direction.

3. The filter of claim 2,

the first filtering cavities of the first filtering branch circuit are coupled with the first common cavity, and the first filtering cavities and the second filtering cavities of the first filtering branch circuit are in a row and are sequentially arranged along the second direction;

the third filter cavity and the fourth filter cavity of the first filter branch approach to the middle branching line of the shell in the first direction relative to the second 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 second filter cavity of the first filter branch and the middle branching line is an acute angle, a second included angle between a connecting line of the center of the fourth filter cavity and the center of the third filter cavity of the first filter branch and the middle branching line is an acute angle, and the second included angle is larger than the first included angle;

the third filtering cavity to the fifth filtering cavity of the first filtering branch are arranged in a triangular shape, and the fourth filtering cavity to the tenth filtering cavity of the first filtering branch are divided into three rows which are sequentially arranged along the first direction;

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

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

and the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction.

4. The filter of claim 3,

the eighth filtering cavity of the first filtering branch is respectively adjacent to the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch, and the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon;

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

and the first filter cavity of the second filter branch circuit is respectively adjacent to the second filter cavity, the third filter cavity and the fifth filter cavity of the second filter branch circuit, the first filter cavity of the first filter branch circuit and the first public cavity.

5. The filter according to claim 3 or 4,

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity of the first filtering branch, between an eighth filtering cavity and a tenth filtering cavity of the first filtering branch, and inductive cross coupling is respectively performed between the fifth filtering cavity and the eighth filtering cavity of the first filtering branch and between a sixth filtering cavity and the eighth filtering cavity of the first filtering branch, so as to form four cross coupling zeros of the first filtering branch;

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

6. The filter according to claim 3 or 4, characterized in that the filter comprises:

a second common chamber spaced from the first common chamber on the housing;

the third filtering branch is coupled with the second common cavity and consists of ten filtering cavities which are sequentially coupled to form four cross-coupling zeros of the third filtering branch;

and the fourth filtering branch is coupled with the second common cavity and consists of seven filtering cavities which are sequentially coupled to form three cross-coupling zeros of the fourth filtering branch.

7. The filter of claim 6,

the fourth filtering cavity to the tenth filtering cavity of the third filtering branch circuit and the fourth filtering cavity to the tenth filtering cavity of the first filtering branch circuit are symmetrically arranged;

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

a second filter cavity and a third filter cavity of the third filter branch approach to the branch line relative to a first filter cavity of the third filter branch, a third included angle between a connecting line of a center of the second filter cavity of the third filter branch and a center of the first filter cavity and the branch line is an acute angle, a fourth included angle between a connecting line of a center of the third filter cavity of the third filter branch and a center of the second filter cavity and the branch line is an acute angle, and the fourth included angle is larger than the third included angle;

the second filtering cavity to the fourth filtering cavity of the third filtering branch are arranged in a triangular mode, the fourth filtering cavity of the third filtering branch is opposite to the third filtering cavity of the third filtering branch towards the middle branch, and a connecting line between the center of the second filtering cavity of the third filtering branch and the center of the fourth filtering cavity and a fifth included angle between the middle branches are acute angles.

8. The filter of claim 7,

seven filter cavities of the fourth filter branch circuit are divided into two rows which are sequentially arranged along the first direction;

the first filter cavity of the fourth filter branch is coupled with the second common cavity;

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

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

9. The filter according to claim 8, wherein the second filter cavity and the fourth filter cavity of the third filter branch, and the eighth filter cavity and the tenth filter cavity of the third filter branch are capacitively cross-coupled, respectively, and the fifth filter cavity and the eighth filter cavity, and the sixth filter cavity and the eighth filter cavity of the third filter branch are inductively cross-coupled to form four cross-coupling zeros of the third filter branch;

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

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