CN211719753U - Filter and communication equipment - Google Patents

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the emission filtering branch is arranged on the shell and consists of six emission filtering cavities which are sequentially coupled to form three coupling zeros of the emission filtering branch; the receiving filter branch consists of five receiving filter cavities which are coupled in sequence to form a coupling zero point of the receiving filter branch; six transmitting filter cavities of the transmitting filter branch are arranged in an inverted S shape along the main coupling sequence, five receiving filter cavities of the receiving filter branch are arranged in a line along the second direction, and the size of the transmitting filter cavity of the transmitting filter branch is larger than that of the receiving filter cavity of the receiving filter branch. By the mode, the size of the filter can be reduced, the whole filter is relatively square, and the design requirement of miniaturization is met.

Description

Filter and communication equipment

Technical Field

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

Background

In a base station system for mobile communication, communication signals carrying communication data in a specific frequency range are generally transmitted through a transmitting antenna, and the communication signals are received through a receiving antenna. The signal received by the receiving antenna contains not only the communication signal carrying the communication data within the specific frequency range, but also a number of clutter or interference signals outside the specific frequency range. To obtain the communication signal carrying communication data in a specific frequency range transmitted by the transmitting antenna from the signal received by the receiving antenna, the signal received by the receiving antenna is usually filtered by a filter to filter out clutter or interference signals outside the specific frequency of the communication signal carrying communication data.

The inventor of the application finds that the existing filter is convenient to process, the filter cavities are expected to be arranged in a straight line under an ideal state, but the power capacities of the filter cavities of the duplexer transmitting and receiving branches are different, so that the sizes of the filter cavities are different, and if the filter cavities are arranged in a straight line, the occupied space of the large-size filter cavity is large, so that the length of the filter in a certain direction is too long, and the miniaturization design of the filter is not facilitated.

SUMMERY OF THE UTILITY MODEL

The application provides a wave filter and communication equipment for the filtering chamber of the receiving and dispatching branch road of wave filter arranges rationally, avoids the length overlength of certain direction of wave filter, thereby reduces the volume of wave filter, makes the whole relative side of wave filter just, and satisfies miniaturized designing requirement.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the emission filtering branch is arranged on the shell and consists of six emission filtering cavities which are sequentially coupled to form three coupling zeros of the emission filtering branch; the receiving filter branch consists of five receiving filter cavities which are coupled in sequence to form a coupling zero point of the receiving filter branch; six transmitting filter cavities of the transmitting filter branch are arranged in an inverted S shape along the main coupling sequence, five receiving filter cavities of the receiving filter branch are arranged in a line along the second direction, and the size of the transmitting filter cavity of the transmitting filter branch is larger than that of the receiving filter cavity of the receiving filter branch.

In order to solve the technical problem, the application adopts a technical scheme that: a communication device is provided. The communication equipment comprises an antenna and a radio frequency unit connected with the antenna, wherein the radio frequency unit comprises the filter and is used for filtering radio frequency signals.

The beneficial effects of the embodiment of the application are that: different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; the emission filtering branch is arranged on the shell and consists of six emission filtering cavities which are sequentially coupled to form three coupling zeros of the emission filtering branch; the receiving filter branch consists of five receiving filter cavities which are coupled in sequence to form a coupling zero point of the receiving filter branch; six transmitting filter cavities of the transmitting filter branch are arranged in an inverted S shape along the main coupling sequence, five receiving filter cavities of the receiving filter branch are arranged in a line along the second direction, and the size of the transmitting filter cavity of the transmitting filter branch is larger than that of the receiving filter cavity of the receiving filter branch. Through the mode, the filter cavity of the receiving and transmitting branch of the filter is reasonably arranged, the length of the filter in a certain direction is prevented from being too long, the size of the filter is reduced, the whole filter is relatively square, and the design requirement of miniaturization is met.

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 according to the present application;

FIG. 2 is a schematic diagram of the topology of the filter of the embodiment of FIG. 1;

FIG. 3 is a diagram illustrating simulation results of the filter of the embodiment of FIG. 1;

FIG. 4 is a diagram of another simulation result of an embodiment of the filter of the present application;

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

Detailed Description

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

The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The present application first proposes a filter, as shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application; fig. 2 is a schematic diagram of the topology of the filter of the embodiment of fig. 1. The filter 10 of the present embodiment includes: the device comprises a shell 11, a transmitting filtering branch 12 and a receiving filtering branch 13, wherein the shell 11 has a first direction x and a second direction y which are perpendicular to each other, and the shell 11 is provided with a first port 14; the emission filtering branch 12 is arranged on the shell 11 and consists of six emission filtering cavities A1-A6 which are coupled in sequence, and the six emission filtering cavities A1-A6 further form three coupling zeros of the emission filtering branch 12; the receiving filter branch circuit 13 is composed of five receiving filter cavities B1-B5 which are coupled in sequence, and the five receiving filter cavities B1-B5 further form a coupling zero point of the receiving filter branch circuit 13; the six transmitting filter cavities A1-A6 of the transmitting filter branch circuit 12 are arranged in an inverted S shape along the main coupling sequence, the five receiving filter cavities B1-B5 of the receiving filter branch circuit 13 are arranged in a line along the second direction y, and the size of the transmitting filter cavity of the transmitting filter branch circuit 12 is larger than that of the receiving filter cavity of the receiving filter branch circuit 13.

Wherein, six emission filter cavities a1-a6 of the emission filter branch 12 include: a first emission filter cavity A1, a second emission filter cavity A2, a third emission filter cavity A3, a fourth emission filter cavity A4, a fifth emission filter cavity A5 and a sixth emission filter cavity A6; the five receiving filter cavities B1-B5 of the receiving filter branch 13 include: a first receiving filter cavity B1, a second receiving filter cavity B2, a third receiving filter cavity B3, a fourth receiving filter cavity B4 and a fifth receiving filter cavity B5.

Different from the prior art, the filter cavities of the transmitting filter branch 12 and the receiving filter branch 13 of the filter 10 are reasonably arranged, and the length of the filter 10 in a certain direction is prevented from being too long, so that the size of the filter 10 is reduced, the filter 10 is relatively square as a whole, and the design requirement of miniaturization is met.

Optionally, the housing 11 is further provided with a first port 14, which is respectively connected to the first transmitting filter cavity a1 of the transmitting filter branch 12 and the first receiving filter cavity B1 of the receiving filter branch 13.

The transmitting filter branch 12 and the receiving filter branch 13 of the filter 10 of the present embodiment share the first port 14, so that the number of ports of the filter 10 can be reduced, and the number of taps used by the filter 10 for the ports can be reduced, thereby reducing the cost of the filter 10 and improving the flexibility of the configuration thereof.

Further, the filter 10 of the present embodiment can realize zero suppression, thereby facilitating the debugging of the index and improving the signal isolation of the filter 10.

Optionally, the six emission filter cavities a1-a6 of the emission filter branch 12 of the present embodiment are divided into two rows arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the transmitting and filtering branch 12, which is beneficial to the miniaturization of the filter 10.

Optionally, the sixth emission filter cavity a6, the third emission filter cavity A3, and the second emission filter cavity a2 of the emission filter branch 12 of the present embodiment are in a row and are sequentially and adjacently disposed along the second direction y; the fifth emission filter cavity a5, the fourth emission filter cavity a4 and the first emission filter cavity a1 of the emission filter branch 12 are in a row and are sequentially and adjacently arranged along the second direction y; the first emission filter cavity a1 of the emission filter branch 12 is further disposed adjacent to the second emission filter cavity a2, and a projection of the first emission filter cavity a1 of the emission filter branch 12 in the second direction y is located between a projection of the second emission filter cavity a2 of the emission filter branch 12 in the second direction y and a projection of the third emission filter cavity A3 of the emission filter branch 12 in the second direction y.

As can be seen from the above analysis, two rows of the six emission filter cavities a1-a6 of the emission filter branch 12 of the present embodiment are adjacently disposed, and a plurality of emission filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the emission filter branch 12 can be further reduced; and the two rows of emission filtering cavities are arranged in a staggered manner, so that the arrangement space of the emission filtering branches 12 can be further reduced.

Further, the six emission filter cavities a1-a6 of the emission filter branch 12 of the present embodiment are all the same in size, and it can be known from the arrangement of the emission filter cavities that the distances between any two groups of adjacent emission filter cavities are equal, so that the row cavities of the emission filter branch 12 can be more compact, and the arrangement space of the emission filter cavities can be reduced.

In other embodiments, the projection of the second emission filter cavity of the emission filter branch 1 in the second direction y may be located between the projection of the first emission filter cavity in the second direction y and the projection of the third emission filter cavity in the second direction y.

Optionally, in this embodiment, the first transmit filter cavity a1 and the third transmit filter cavity A3 of the transmit filter branch 12, the fourth transmit filter cavity a4 and the sixth transmit filter cavity a6 of the transmit filter branch 12 are respectively capacitively cross-coupled to form two capacitive coupling zeros of the transmit filter branch 12, and the third transmit filter cavity A3 and the sixth transmit filter cavity a6 of the transmit filter branch 12 are inductively cross-coupled to form one inductive coupling zero of the transmit filter branch 12.

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 is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, a flying rod (equivalent to the capacitor C1 shown in fig. 2) is disposed between the first emission filter cavity a1 and the third emission filter cavity A3 of the emission filter branch 12, and a flying rod (equivalent to the capacitor C2 shown in fig. 2) is disposed between the fourth emission filter cavity a4 and the sixth emission filter cavity a6 of the emission filter branch 12. As can be seen from the above analysis, the distance between the first emission filter cavity a1 and the third emission filter cavity A3 of the emission filter branch 12 and the distance between the fourth emission filter cavity a4 and the sixth emission filter cavity a6 of the emission filter branch 12 are equal, so that the flying bar elements with the same specification can be used to achieve the effect of implementing two capacitive coupling zeros of the emission filter branch 12. When the transmitting and filtering branch circuit 12 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

Generally, the inductive coupling zero point is realized by a window, and a metal coupling rib is arranged on the window. Namely, a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 2) are disposed between the third emission filter cavity A3 and the sixth emission filter cavity a6 of the emission filter branch 12. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subjected to a small change of the external temperature, so as to reduce the temperature drift of the filter 10.

Optionally, in this embodiment, the first receiving filter cavity B1 to the fifth receiving filter cavity B5 of the receiving filter branch 13 are in a row and are sequentially and adjacently disposed along the second direction y; the arrangement space of the receiving filter branches 13 can be reduced by arranging the receiving filter branches in a row and adjacent to each other in sequence, which is beneficial to the miniaturization of the filter 10.

Optionally, the projection of the fifth receiving filter cavity a5 of the transmitting filter branch 12 in the first direction x is located between the projection of the sixth receiving filter cavity a6 of the transmitting filter branch 12 in the first direction x and the projection of the fifth receiving filter cavity B5 of the receiving filter branch 13 in the first direction x.

As can be seen from the above analysis, the first port 14 is respectively connected to the first transmitting filter cavity a1 of the transmitting filter branch 12 and the first receiving filter cavity B1 of the receiving filter branch 13, and the row of the transmitting filter cavity a1 is located in the middle of the row of the second transmitting filter cavity a2 and the row of the first receiving filter cavity B1, so that the cavity-arranging structure of the embodiment can reduce the length of the port components such as taps, reduce signal loss, and save cost.

Optionally, the transmitting filter branch 12 and the receiving filter branch 13 of the present embodiment are disposed at an interval, so that signal crosstalk between the two branches can be reduced. In other embodiments, the transmitting filtering branch and the receiving filtering branch may also be disposed adjacent to each other.

Optionally, the second receiving filter cavity B2 of the receiving filter branch 13 and the fourth receiving filter cavity B4 of the present embodiment are inductively cross-coupled to form an inductive coupling zero of the receiving filter branch 13.

Specifically, a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 2) may be disposed between the second receiving filter cavity B2 and the fourth receiving filter cavity B4 of the receiving filter branch 13. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subjected to a small change of the external temperature, so as to reduce the temperature drift of the filter 10.

Optionally, the housing 11 of the present embodiment is further provided with a second port 15 and a third port 16, the sixth transmitting filter cavity a6 of the transmitting filter branch 12 is connected to the second port 15, and the fifth receiving filter cavity B5 of the receiving filter branch is connected to the third port 16.

In this embodiment, the first port 14 is an output end of the transmitting filter branch 12 and the receiving filter branch 13, the second port 15 is an input end of the transmitting filter branch 12, and the third port 16 is an input end of the receiving filter branch 13; the first port 14, the second port 15 and the third port 16 may all be taps of the filter 10.

The bandwidth of the transmit filter branch 12 of this embodiment is in the range 895MHz-962 MHz. Specifically, the coupling bandwidth between the first port 14 and the first transmitting filter cavity a1 ranges from 65MHz to 77 MHz; the coupling bandwidth between the first emission filter cavity A1 and the second emission filter cavity A2 ranges from 37MHz to 45 MHz; the coupling bandwidth between the first emission filter cavity A1 and the third emission filter cavity A3 is in the range of (-43) MHz- (-35) MHz; the coupling bandwidth between the second emission filter cavity A2 and the third emission filter cavity A3 ranges from 21MHz to 18 MHz; the coupling bandwidth between the third emission filter cavity A3 and the fourth emission filter cavity A4 ranges from 33MHz to 41 MHz; the coupling bandwidth between the third emission filter cavity A3 and the sixth emission filter cavity A6 ranges from 11MHz to 17 MHz; the coupling bandwidth between the fourth emission filter cavity A4 and the fifth emission filter cavity A5 ranges from 12MHz to 17 MHz; the coupling bandwidth between the fourth emission filter cavity A4 and the sixth emission filter cavity A6 is in the range of (-48) MHz- (-39) MHz; the coupling bandwidth between the fifth emission filter cavity A5 and the sixth emission filter cavity A6 ranges from 29MHz to 37 MHz; the coupling bandwidth between the sixth emission filter cavity a6 and the second port 15 ranges from 65MHz to 77MHz, which can meet the design requirement.

The resonant frequencies of the first emission filter cavity a1 to the sixth emission filter cavity a6 of the emission filter branch 12 are sequentially in the following ranges: 929MHz-931MHz, 902MHz-904MHz, 934MHz-936MHz, 924MHz-926MHz, 899MHz-901MHz, 929MHz-931 MHz.

The bandwidth of the receiving filter branch 13 of the present embodiment is in the range of 701MHz-805 MHz. Specifically, the coupling bandwidth between the first port 14 and the first receiving filter cavity B1 ranges from 119MHz to 136 MHz; the coupling bandwidth between the first receiving filter cavity B1 and the second receiving filter cavity B2 ranges from 92MHz to 105 MHz; the coupling bandwidth between the second receiving filter cavity B2 and the third receiving filter cavity B3 is in the range of 60MHz-71 MHz; the coupling bandwidth between the second receiving filter cavity B2 and the fourth receiving filter cavity B4 ranges from 18MHz to 25 MHz; the coupling bandwidth between the third receiving filter cavity B3 and the fourth receiving filter cavity B4 is in the range of 60MHz-71 MHz; the coupling bandwidth between the fourth receiving filter cavity B4 and the fifth receiving filter cavity B5 ranges from 92MHz to 105 MHz; the coupling bandwidth between the fifth receiving filter cavity B5 and the third port 16 is in the range of 119MHz-136MHz, which can meet the design requirement.

The resonant frequencies of the first receiving filter cavity B1 through the fifth receiving filter cavity B6 of the receiving filter branch 13 are sequentially in the following ranges: 746MHz-748MHz, 766MHz-768MHz, 746MHz-748 MHz.

Therefore, the resonant frequency of each filter cavity in each filter branch is basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 3, fig. 3 is a diagram showing simulation results of the filter of fig. 1. Through experimental tests, the bandwidth of the emission filtering branch 12 of the present application is within a range from 895MHz to 962MHz, as shown by a frequency band curve S1 in fig. 3, the bandwidth inhibition of the zero point a and the zero point b of the cross coupling zero point within a frequency band from 880MHz to 890MHz of the emission filtering branch 12 is greater than 50dB, and the bandwidth inhibition of the frequency band from 703MHz to 803MHz is greater than 50dB, so that the out-of-band inhibition performance and other performances of the emission filtering branch 12 can be improved; the bandwidth of the transmitting and filtering branch 12 is located in a range from 701MHz to 805MHz, as shown by a frequency band curve S2 in fig. 3, the bandwidth rejection of the zero point c of the receiving and filtering branch 13 located in a frequency band from 898.4MHz to 960MHz is greater than 50dB of cross-coupling zero point, and the bandwidth rejection of the frequency band from 880MHz to 890MHz is greater than 50dB, so that the performances of the receiving and filtering branch 13, such as out-of-band rejection, can be improved; therefore, the isolation of the filter 10 for transmitting and receiving signals can be improved.

In another embodiment, the bandwidth of the transmit filter branch 12 may also be in the range 873MHz-962 MHz. Specifically, the coupling bandwidth between the first port 14 and the first transmitting filter cavity a1 ranges from 91MHz to 105 MHz; the coupling bandwidth between the first emission filter cavity A1 and the second emission filter cavity A2 is in the range of 67MHz-75 MHz; the coupling bandwidth between the first emission filter cavity A1 and the third emission filter cavity A3 is in the range of (-33) MHz- (-29) MHz; the coupling bandwidth between the second emission filter cavity A2 and the third emission filter cavity A3 ranges from 41MHz to 50 MHz; the coupling bandwidth between the third emission filter cavity A3 and the fourth emission filter cavity A4 ranges from 47MHz to 56 MHz; the coupling bandwidth between the third emission filter cavity A3 and the sixth emission filter cavity a6 ranges from 4Mhz to 9 Mhz; the coupling bandwidth between the fourth emission filter cavity A4 and the fifth emission filter cavity A5 ranges from 21MHz to 41 MHz; the coupling bandwidth between the fourth emission filter cavity A4 and the sixth emission filter cavity A6 is in the range of (-46) MHz- (-38) MHz; the coupling bandwidth between the fifth emission filter cavity A5 and the sixth emission filter cavity A6 ranges from 59MHz to 69 MHz; the coupling bandwidth between the sixth emission filtering cavity a6 and the second port 15 ranges from 91MHz to 105MHz, which can meet the design requirement.

The resonant frequencies of the first to sixth filter cavities a1 to a6 of the transmitting filter branch 12 are in the following ranges in sequence: 917MHz-919MHz, 894MHz-896MHz, 922MHz-924MHz, 919MHz-921MHz, 888MHz-890MHz, 917MHz-919 MHz.

The bandwidth of the receiving filter branch circuit 13 of the present embodiment is located in a range of 696MHz-805 MHz; other parameters of the receiving filter branch circuit 13 of this embodiment are the same as those of the receiving filter branch circuit 13 of the above embodiment, and are not described in detail here.

Therefore, the resonant frequency of each filter cavity in each filter branch is basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 4, fig. 4 is a diagram illustrating another simulation result of the filter embodiment of the present application. Through experimental tests, the bandwidth of the emission filtering branch 12 of the present application is within a range from 873MHz to 962MHz, as shown by a frequency band curve S1 in fig. 4, the bandwidth rejection of the frequency point of the emission filtering branch 12, which is 850MHz, is greater than 50dB, and therefore the bandwidth rejection of the zero point a and the zero point b is greater than 50dB, so that the performances of the emission filtering branch 12, such as out-of-band rejection, can be improved; the bandwidth of the transmitting and filtering branch 12 is in the range of 696MHz-805MHz, as shown by a frequency band curve S2 in fig. 4, the bandwidth suppression of the zero c of the frequency point 885MHz of the receiving and filtering branch 13 is greater than 50dB, so that the out-of-band suppression and other performances of the receiving and filtering branch 13 can be improved; therefore, the isolation of the filter 10 for transmitting and receiving signals can be improved.

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 parameter are shown as the same coupling zero; and the above-mentioned rf parameters of other filtering branches are similar to those of the transmitting filtering branch 12, which is not described herein again.

Some embodiments of the present application are referred to as filters, and may also be referred to as duplexers.

The present application further provides a communication device, as shown in fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device of the present embodiment includes an antenna 32 and a radio frequency unit 31 connected to the antenna 32, the radio frequency unit 31 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering a radio frequency signal.

In other embodiments, the rf Unit 31 may be integrated with the Antenna 32 to form an Active Antenna Unit (AAU).

Different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; the emission filtering branch is arranged on the shell and consists of six emission filtering cavities which are sequentially coupled to form three coupling zeros of the emission filtering branch; the receiving filter branch consists of five receiving filter cavities which are coupled in sequence to form a coupling zero point of the receiving filter branch; six transmitting filter cavities of the transmitting filter branch are arranged in an inverted S shape along the main coupling sequence, five receiving filter cavities of the receiving filter branch are arranged in a line along the second direction, and the size of the transmitting filter cavity of the transmitting filter branch is larger than that of the receiving filter cavity of the receiving filter branch. Through the mode, the filter cavity of the receiving and transmitting branch of the filter is reasonably arranged, the length of the filter in a certain direction is prevented from being too long, the size of the filter is reduced, the whole filter is relatively square, and the design requirement of miniaturization is met.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

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

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

the emission filtering branch is arranged on the shell and consists of six emission filtering cavities which are sequentially coupled to form three coupling zeros of the emission filtering branch;

the receiving filter branch consists of five receiving filter cavities which are coupled in sequence to form a coupling zero point of the receiving filter branch;

wherein, the six transmission filter cavities of transmission filter branch road are along main coupling order and are the reverse "S" shape and arrange, receive filter branch road five receipt filter cavities are followed the second direction is arranged in a word, the transmission filter cavity size of transmission filter branch road is greater than the receipt filter cavity size of receipt filter branch road.

2. The filter of claim 1,

the sixth emission filtering cavity, the third emission filtering cavity and the second emission filtering cavity of the emission filtering branch are in a row and are sequentially and adjacently arranged along the second direction;

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

the first emission filter cavity of the emission filter branch is adjacent to the second emission filter cavity of the emission filter branch, and the projection of the first emission filter cavity of the emission filter branch in the second direction is located between the projection of the second emission filter cavity of the emission filter branch in the second direction and the projection of the third emission filter cavity of the emission filter branch in the second direction.

3. The filter according to claim 2, wherein the first transmit filter cavity and the third transmit filter cavity of the transmit filter branch and the fourth transmit filter cavity and the sixth transmit filter cavity of the transmit filter branch are capacitively cross-coupled to form two capacitive coupling zeros of the transmit filter branch, and the third transmit filter cavity and the sixth transmit filter cavity of the transmit filter branch are inductively cross-coupled to form one inductive coupling zero of the transmit filter branch.

4. The filter of claim 2, wherein the transmit filter branch is spaced apart from the receive filter branch.

5. The filter of claim 4,

the projection of the fifth transmitting filter cavity of the transmitting filter branch in the first direction is positioned between the projection of the sixth transmitting filter cavity of the transmitting filter branch in the first direction and the projection of the fifth receiving filter cavity of the receiving filter branch in the first direction.

6. The filter according to claim 5, wherein the second receiving filter cavity and the fourth receiving filter cavity of the receiving filter branch are inductively cross-coupled to form an inductively coupled zero of the transmitting filter branch.

7. The filter according to claim 5, wherein the housing further has a first port, and the first port is connected to the first transmitting filter cavity of the transmitting filter branch and the first receiving filter cavity of the receiving filter branch respectively.

8. The filter of claim 7, wherein the housing is further provided with a second port and a third port, the sixth transmitting filter cavity of the transmitting filter branch is connected to the second port, and the fifth receiving filter cavity of the receiving filter branch is connected to the third port.

9. The filter of claim 1, wherein the bandwidth of the transmitting filtering branch is in the range of 895MHz-962MHz, and the bandwidth of the receiving filtering branch is in the range of 701MHz-805 MHz.

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

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