CN113054373A

CN113054373A - Communication device and filter thereof

Info

Publication number: CN113054373A
Application number: CN201911383505.XA
Authority: CN
Inventors: 屈兵; 温世议; 李华; 符其略
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 thereof. The filter includes: a housing having a first direction and a second direction perpendicular to the first direction; the first port is arranged on the shell, the first filtering branch circuit is coupled with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the first filtering branch circuit are divided into two rows which are arranged along the second direction; and the second filtering branch circuit is coupled with the first port, consists of seven filtering cavities which are sequentially coupled and forms two cross-coupling zeros of the second filtering branch circuit, and the seven filtering cavities of the second filtering branch circuit are divided into two rows which are arranged along the second direction. By means of the mode, the number of taps of the filter can be reduced, production cost is lowered, and the size of the filter can be 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 system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.

The inventor of the application discovers in long-term research and development work that when the existing filter comprises multiple filtering branches, each filtering branch needs to be provided with a tap of an input end and an output end independently, the number of taps is large, the space of the filter is occupied, and the filter is large in size and high in cost.

Disclosure of Invention

In order to solve the above problems of the prior art filter, the present application provides a communication device and a filter thereof.

To solve the above problem, an embodiment of the present application provides a filter, including: a housing having a first direction and a second direction perpendicular to the first direction; the first port is arranged on the shell, the first filtering branch circuit is coupled with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the first filtering branch circuit are divided into two rows which are arranged along the second direction; and the second filtering branch circuit is coupled with the first port, consists of seven filtering cavities which are sequentially coupled and forms two cross-coupling zeros of the second filtering branch circuit, and the seven filtering cavities of the second filtering branch circuit are divided into two rows which are arranged along the second direction.

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 of the above embodiment, and is configured to filter a radio frequency signal.

Be different from prior art's condition, the first filtering branch road and the coupling of second filtering branch road all with first port of this application consequently reduce the quantity of taking a percentage of wave filter, reduce the space of taking a percentage shared wave filter, reduce the volume of wave filter, reduce cost. And the filtering cavities of the first filtering branch and the second filtering branch are regularly arranged, so that the design and debugging are facilitated, and the size of the filter is favorably reduced. In addition, the first filtering branch circuit adopts pure window coupling, the consistency of the window coupling is good, other materials do not need to be arranged, and the production cost is reduced.

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; a

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

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

fig. 5 is a diagram illustrating simulation results of a second filtering branch provided in the present application;

fig. 6 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 apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a filter provided in the present application. The filter 10 of the present embodiment includes a housing 11, a first port (not shown), a first filtering branch 121 and a second filtering branch 123, where the housing 11 has a first direction L and a second direction D perpendicular to the first direction L, the first direction L may be a length direction of the housing 11, and the second direction D may be a width direction of the housing 11.

As shown in fig. 1, the first filtering branch 121 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the first filtering branch 121 are a first filtering cavity a1, a second filtering cavity a2, a third filtering cavity A3, a fourth filtering cavity a4 and a fifth filtering cavity a5 of the first filtering branch 121. The second filtering branch 123 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the second filtering branch 123 are a first filtering cavity C1, a second filtering cavity C2, a third filtering cavity C3, a fourth filtering cavity C4, a fifth filtering cavity C5, a sixth filtering cavity C6 and a seventh filtering cavity C7 of the second filtering branch 123.

The first port is disposed on the housing 11, the first filter cavity a1 of the first filter branch 121 is coupled to the first port, and the first filter cavity C1 of the second filter branch 123 is coupled to the first port. Wherein the first port may be a tap of the filter.

That is, in the present embodiment, the first filtering branch 121 and the second filtering branch 123 share the first port, so that the number of taps of the filter 10 can be reduced, the space occupied by the taps on the filter 10 can be reduced, the size of the filter 10 can be reduced, and the cost can be reduced.

Further, as shown in fig. 1, the first filtering branch 121 and the second filtering branch 123 are disposed at intervals along the first direction, and five filtering cavities of the first filtering branch 121 are divided into two rows arranged along the second direction D. Specifically, the first filter cavity a1, the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 121 are in a row and are sequentially arranged along the first direction L; the second filter cavity a2 and the fifth filter cavity a5 of the first filter branch 121 are in a row and are sequentially arranged along the first direction L. That is, the first filtering branches 121 are regularly distributed in two rows, which facilitates the design of the filter 10 and reduces the size of the filter 10.

The third filtering cavity A3 of the first filtering branch 121 is further disposed adjacent to the first filtering cavity a1, the second filtering cavity a2, the fourth filtering cavity a4 and the fifth filtering cavity a5 of the first filtering branch 121, respectively. The adjacent arrangement of the first filter branch 121 can make the filter cavities arranged more tightly, thereby facilitating the miniaturization of the filter 10.

As shown in fig. 1, the seven filter cavities of the second filter branch 123 are divided into two columns arranged along the second direction D. Specifically, the third filtering cavity C3, the second filtering cavity C2 and the first filtering cavity C1 of the second filtering branch 123 are in a row and are sequentially arranged along the first direction L; the fourth filter cavity C4, the fifth filter cavity C5, the sixth filter cavity C6 and the seventh filter cavity C7 of the second filter branch 123 are in a row and are sequentially arranged along the first direction L. I.e., the second filtering branches 123 are regularly distributed in two rows, which facilitates the design of the filter 10 and reduces the size of the filter 10.

The fifth filtering cavity C5 of the second filtering branch 123 is further disposed adjacent to the fourth filtering cavity C4, the third filtering cavity C3, the second filtering cavity C2 and the sixth filtering cavity C6 of the second filtering branch 123, respectively, and the first filtering cavity C1 of the second filtering branch 123 is further disposed adjacent to the second filtering cavity C2, the sixth filtering cavity C6 and the seventh filtering cavity C7 of the second filtering branch 123, respectively. The arrangement of the filter cavities of the second filter branch 123 can be more compact by such an adjacent arrangement, thereby facilitating the miniaturization of the filter 10.

Referring to fig. 1 and fig. 2, fig. 2 is a schematic diagram of a topology structure of the first filter branch 121 provided in the present application, and the first filter cavity a1 to the fifth filter cavity a5 of the first filter branch 121 may be pure window coupling, which has good consistency of window coupling and low cost, and no other material (e.g., capacitive cross-coupled material) is required.

Referring to fig. 1 and fig. 3, fig. 3 is a schematic diagram of a topology structure of the second filtering branch 123 provided in the present application, in which the second filtering cavity C2 and the fifth filtering cavity C5 of the second filtering branch 123 are inductively cross-coupled, and the third filtering cavity C3 and the fifth filtering cavity C5 of the second filtering branch 123 are capacitively cross-coupled to form two cross-coupling zeros of the second filtering branch 123. Typically the capacitive cross-coupling element may be a flying rod, i.e. a flying rod is arranged between the third filter chamber C3 and the fifth filter chamber C5 of the second filter branch 123, for example. Usually, the inductive cross-coupling element may be a metal coupling rib, i.e. a metal coupling rib is arranged between the second filter cavity C2 and the fifth filter cavity C5 of the second filter branch 123, for example. The second filtering branch 123 can realize zero point suppression through two cross-coupling zero points of the second filtering branch 123, which is convenient for debugging indexes.

The cross-coupling zeros are also referred to as transmission zeros. 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.

Wherein the housing 11 is further provided with a second port (not shown) and a third port (not shown), and the fifth filter cavity a5 of the first filter branch 121 is coupled with the second port. The seventh filter cavity C7 of the second filter branch 123 is coupled to the third port. Wherein the second port and the third port may both be taps of the filter 10.

In the first filtering branch 121, the coupling bandwidth between the first port and the first filtering cavity a1 of the first filtering branch 121 is in the range of 25MHz-32 MHz; the coupling bandwidth between the first filter cavity a1 of the first filter branch 121 and the second filter cavity a2 of the first filter branch 121 ranges from 20MHz to 26 MHz; the coupling bandwidth between the second filter cavity a2 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121 ranges from 14MHz to 20 MHz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 121 and the fourth filter cavity a4 of the first filter branch 121 ranges from 14MHz to 20 MHz; the coupling bandwidth between the fourth filter cavity a4 of the first filter branch 121 and the fifth filter cavity a5 of the first filter branch 121 ranges from 20MHz to 26 MHz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 121 and the second port is in the range of 25MHz-32 MHz.

The resonant frequencies of the first filter cavity a1 through the fifth filter cavity a5 of the first filter branch 121 are sequentially in the following ranges: 1721MHz-1723MHz, 1721MHz-1723MHz, 1721MHz-1723MHz, 1721MHz-1723MHz, 1721MHz-1723MHz, and 1721MHz-1723 MHz.

As shown in fig. 4, fig. 4 is a schematic diagram of a simulation result of the first filtering branch 121 provided in the present application. The simulated bandwidth of the first filtering branch 121 in this embodiment is as shown in a frequency band curve 41 in fig. 4, and it can be obtained that the simulated bandwidth of the first filtering branch 121 is located in a range from 1708MHz to 1737MHz, which meets the design requirement of the filter 10, and can accurately control the bandwidth of the first filtering branch 121. When the frequency range of the first filtering branch 121 is 9KHz-1560.5MHz, the suppression is more than or equal to 50 dB; when the frequency range of the first filtering branch 121 is 1560.5MHz-1690.5MHz, the suppression is more than or equal to 16 dB; when the frequency range of the first filtering branch 121 is 1784.5MHz-1799.5MHz, the suppression is greater than or equal to 42 dB; when the frequency range of the first filtering branch 121 is 1799.5MHz-1880MHz, the suppression is greater than or equal to 62 dB; when the frequency range of the first filtering branch 121 is 1880MHz-3670MHz, the suppression is more than or equal to 50 dB; when the frequency range of the first filtering branch 121 is 3670MHz-4300MHz, the suppression is more than or equal to 70 dB; when the frequency range of the first filtering branch 121 is 4300MHz to 6000MHz, the suppression is greater than or equal to 21 dB. The out-of-band rejection etc. of the first filtering branch 121 can be improved.

In the second filtering branch 123, the coupling bandwidth between the first port and the first filtering cavity C1 of the second filtering branch 123 is in the range of 24MHz-31 MHz; the coupling bandwidth between the first filter cavity C1 of the second filter branch 123 and the second filter cavity C2 of the second filter branch 123 ranges from 19MHz to 25 MHz; the coupling bandwidth between the second filter cavity C2 of the second filter branch 123 and the third filter cavity C3 of the second filter branch 123 is in the range of 12MHz-18 MHz; the coupling bandwidth between the second filter cavity C2 of the second filter branch 123 and the fifth filter cavity C5 of the second filter branch 123 is in the range of 0MHz-4 MHz; the coupling bandwidth between the third filter cavity C3 of the second filter branch 123 and the fourth filter cavity C4 of the second filter branch 123 is in the range of 8MHz to 13 MHz; the coupling bandwidth between the third filter cavity C3 of the second filter branch 123 and the fifth filter cavity C5 of the second filter branch 123 is in the range of (-11) MHz- (-6) MHz; the coupling bandwidth between the fourth filter cavity C4 of the second filter branch 123 and the fifth filter cavity C5 of the second filter branch 123 is in the range of 9MHz to 14 MHz; the coupling bandwidth between the fifth filter cavity C5 of the second filter branch 123 and the sixth filter cavity C6 of the second filter branch 123 is in the range of 12MHz-18 MHz; the coupling bandwidth between the sixth filter cavity C6 of the second filter branch 123 and the seventh filter cavity C7 of the second filter branch 123 ranges from 19MHz to 25 MHz; the coupling bandwidth between the seventh filtering cavity C7 and the fifth port of the second filtering branch 123 is in the range of 24MHz-31 MHz.

The resonant frequencies of the first filter cavity C1 through the seventh filter cavity C7 of the second filter branch 123 are sequentially in the following ranges: 1817MHz to 1819MHz, 1816MHz to 1818MHz, 1808MHz to 1810MHz, 1817MHz to 1819 MHz.

As shown in fig. 5, fig. 5 is a schematic diagram of a simulation result of the second filtering branch 123 provided in the present application, and the simulation bandwidth of the second filtering branch 123 of this embodiment is as shown in a frequency band curve 71 in fig. 5, so that the simulation bandwidth of the second filtering branch 123 is within a range from 1803MHz to 1832MHz, which meets the design requirement of the filter 10, and can accurately control the bandwidth of the second filtering branch 123. When the frequency range of the second filtering branch 123 is 9KHz-1626.5MHz, the suppression is greater than or equal to 65 dB; when the frequency range of the second filtering branch 123 is 1626.5MHz-1660.5MHz, the suppression is greater than or equal to 75 dB; when the frequency range of the second filtering branch 123 is 1660.5MHz-1710MHz, the suppression is more than or equal to 39 dB; when the frequency range of the second filtering branch 123 is 1710MHz-1735.5MHz, the suppression is more than or equal to 101 dB; when the frequency range of the second filtering branch 123 is 1735.5MHz-1785.5MHz, the suppression is more than or equal to 76 dB; when the frequency range of the second filtering branch 123 is 1785.5MHz-1795.5MHz, the suppression is more than or equal to 19 dB; when the frequency range of the second filtering branch 123 is 1879.5MHz-1919.5MHz, the suppression is greater than or equal to 68 dB; when the frequency range of the second filtering branch 123 is 1919.5MHz-1949.5MHz, the suppression is greater than or equal to 74 dB; when the frequency range of the second filtering branch 123 is 1950MHz-2025MHz, the suppression is more than or equal to 85 dB; when the frequency range of the second filtering branch 123 is 2025MHz-2300MHz, the suppression is more than or equal to 30 dB; when the frequency range of the second filtering branch 123 is 2300MHz-2496MHz, the suppression is greater than or equal to 65 dB; when the frequency range of the second filtering branch 123 is 2496MHz-3800MHz, the suppression is more than or equal to 50 dB; when the frequency range of the second filtering branch 123 is 3800MHz-5150MHz, the suppression is more than or equal to 20 dB; when the frequency range of the second filtering branch 123 is 5150MHz-5850MHz, the suppression is more than or equal to 43 dB; when the frequency range of the second filtering branch 123 is 5850MHz-6000MHz, the suppression is greater than or equal to 20 dB. Therefore, the out-of-band rejection and other performances of the second filtering branch 123 can be improved.

Further, the filter may also include a third filtering branch 122 and a fourth filtering branch 124. As shown in fig. 1, the third filtering branch 122 is composed of six filtering cavities coupled in sequence, and the six filtering cavities of the third filtering branch 122 are a first filtering cavity B1, a second filtering cavity B2, a third filtering cavity B3, a fourth filtering cavity B4 and a fifth filtering cavity B5 of the third filtering branch 122. The third filtering branch 122 and the first filtering branch 121 are symmetrically arranged along the second direction D. For a specific structure of the third filtering branch 122, please refer to the structure of the first filtering branch 121, which is not described herein again.

The topology of the third filtering branch 122 is the same as that of the first filtering branch 121, and is not described herein again.

The fourth filtering branch 124 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the fourth filtering branch 124 are a first filtering cavity D1, a second filtering cavity D2, a third filtering cavity D3, a fourth filtering cavity D4, a fifth filtering cavity D5, a sixth filtering cavity D6 and a seventh filtering cavity D7 of the fourth filtering branch 124. The fourth filtering branch 124 and the second filtering branch 123 are symmetrically disposed along the second direction D, and the structure of the fourth filtering branch 124 refers to the structure of the second filtering branch 123, which is not described herein again.

The topology of the fourth filtering branch 124 is the same as that of the second filtering branch 123, and is not described herein again.

The housing 11 is further provided with a fourth port (not shown), a fifth port (not shown) and a sixth port (not shown), the first filter cavity B1 of the third filter branch 122 is coupled to the fourth port, the first filter cavity D1 of the fourth filter branch 124 is coupled to the fourth port, and the fifth filter cavity B5 of the third filter branch 122 is coupled to the fifth port. The seventh filter cavity D7 of the fourth filter branch 122 is coupled to the sixth port. Wherein the fourth port, the fifth port and the sixth port may all be taps of the filter 10.

That is, in the present embodiment, the third filtering branch 122 and the fourth filtering branch 124 share the fourth port, so that the number of taps of the filter 10 can be reduced, the space occupied by the taps on the filter 10 can be reduced, the size of the filter 10 can be reduced, and the cost can be reduced.

The tuning index parameter of the third filtering branch 122 may be the same as the tuning index parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the third filtering branch 122 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the third filtering branch 122. The simulation result of the third filtering branch 122 in this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning index parameter of the fourth filtering branch 124 may be the same as the tuning index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the fourth filtering branch 124 is within the range of 1803MHz-1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the fourth filtering branch 124. The simulation result of the fourth filtering branch 124 of this embodiment is the same as the frequency band curve 71 in fig. 5, and is not repeated here.

Further, the filter 10 may further include a fifth filtering branch 125, a sixth filtering branch 126, a seventh filtering branch 127, and an eighth filtering branch 128.

The fifth filtering branch 125 and the third filtering branch 122 are symmetrically disposed along the second direction D, specifically, as shown in fig. 1, the fifth filtering branch 125 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the fifth filtering branch 125 are the first filtering cavity E1, the second filtering cavity E2, the third filtering cavity E3, the fourth filtering cavity E4 and the fifth filtering cavity E5 of the fifth filtering branch 125. The structure of the fifth filtering branch 125 is the same as that of the first filtering branch 121, and is not described herein again.

The sixth filtering branch 126 and the fifth filtering branch 125 are symmetrically arranged along the second direction D, the sixth filtering branch 126 is composed of five sequentially coupled filtering cavities, and the five filtering cavities of the sixth filtering branch 126 are a first filtering cavity F1, a second filtering cavity F2, a third filtering cavity F3, a fourth filtering cavity F4 and a fifth filtering cavity F5 of the sixth filtering branch 126. The structure of the sixth filtering branch 126 is the same as that of the third filtering branch 122, and is not described herein again.

The topology of the fifth filtering branch 125 and the sixth filtering branch 126 is the same as that of the first filtering branch 121, and is not described herein again.

The seventh filtering branch 127 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the seventh filtering branch 127 are a first filtering cavity G1, a second filtering cavity G2, a third filtering cavity G3, a fourth filtering cavity G4, a fifth filtering cavity G5, a sixth filtering cavity G6 and a seventh filtering cavity G7 of the seventh filtering branch 127. The seventh filtering branch 127 and the fourth filtering branch 124 are symmetrically disposed along the second direction D, and the structure of the seventh filtering branch 127 is the same as that of the second filtering branch 123, which is not described herein again.

The eighth filtering branch 128 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the eighth filtering branch 128 are a first filtering cavity H1, a second filtering cavity H2, a third filtering cavity H3, a fourth filtering cavity H4, a fifth filtering cavity H5, a sixth filtering cavity H6 and a seventh filtering cavity H7 of the eighth filtering branch 128. The eighth filtering branch 128 and the fourth filtering branch 124 have the same structure, and are not described herein again.

The topology structures of the seventh filtering branch 127 and the eighth filtering branch 128 are the same as the topology structure of the second filtering branch 123, and are not described herein again.

The housing 11 is further provided with a seventh port (not shown), an eighth port (not shown), a ninth port (not shown), a tenth port (not shown), an eleventh port (not shown), and a twelfth port (not shown), the first filter cavity E1 of the fifth filter branch circuit 125 is coupled to the seventh port, the first filter cavity G1 of the seventh filter branch circuit 127 is coupled to the seventh port, and the fifth filter cavity E5 of the fifth filter branch circuit 125 is coupled to the eighth port. The seventh filtering cavity G7 of the seventh filtering branch 127 is coupled with the ninth port. The first filter cavity F1 of the sixth filter branch 126 is coupled to the tenth port, the first filter cavity H1 of the eighth filter branch 128 is coupled to the tenth port, the fifth filter cavity F5 of the sixth filter branch 126 is coupled to the eleventh port, and the seventh filter cavity H7 of the eighth filter branch 128 is coupled to the twelfth port, wherein the seventh port, the eighth port, the ninth port, the tenth port, the eleventh port, and the twelfth port may be taps of the filter 10.

That is, in this embodiment, the fifth filtering branch 125 and the seventh filtering branch 127 share the seventh port, and the sixth filtering branch 126 and the eighth filtering branch 128 share the tenth port, so that the number of taps of the filter 10 can be reduced, the space of the filter 10 occupied by the taps can be reduced, the size of the filter 10 can be reduced, and the cost can be reduced.

The tuning index parameter of the fifth filtering branch 125 may be the same as the tuning index parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the fifth filtering branch 125 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the fifth filtering branch 125. The simulation result of the fifth filtering branch 125 in this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning indicator parameter of the sixth filtering branch 126 may be the same as the tuning indicator parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the sixth filtering branch 126 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the sixth filtering branch 126. The simulation result of the sixth filtering branch 126 in this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning index parameter of the seventh filtering branch 127 may be the same as the tuning index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the seventh filtering branch 127 is within the range of 1803MHz-1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the seventh filtering branch 127. The simulation result of the seventh filtering branch 127 of this embodiment is the same as the frequency band curve 71 in fig. 5, and is not described herein again.

The tuning indicator parameter of the eighth filtering branch 128 may be the same as the tuning indicator parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the eighth filtering branch 128 is within the range of 1803MHz to 1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the eighth filtering branch 128. The simulation result of the eighth filtering branch 128 of this embodiment is the same as the frequency band curve 71 in fig. 5, and is not repeated here.

Further, as shown in fig. 1, the filter 10 may further include a ninth filtering branch 129, a tenth filtering branch 130, an eleventh filtering branch 131, and a twelfth filtering branch 132. The eleventh filtering branch 131 and the twelfth filtering branch 132 are symmetrically disposed along the second direction D.

The ninth filtering branch 129 and the sixth filtering branch 126 are symmetrically arranged along the second direction. Specifically, as shown in fig. 1, the ninth filtering branch 129 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the ninth filtering branch 129 are a first filtering cavity I1, a second filtering cavity I2, a third filtering cavity I3, a fourth filtering cavity I4 and a fifth filtering cavity I5 of the ninth filtering branch 129. The structure of the ninth filtering branch 129 is the same as that of the first filtering branch 121, and is not described herein again.

The tenth filtering branch 130 and the ninth filtering branch 129 are symmetrically arranged along the second direction D. The tenth filtering branch 130 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the tenth filtering branch 130 are a first filtering cavity J1, a second filtering cavity J2, a third filtering cavity J3, a fourth filtering cavity J4 and a fifth filtering cavity J5 of the tenth filtering branch 130. The structure of the tenth filtering branch 130 is the same as that of the third filtering branch 122, and is not described herein again.

The topology structure diagram of the ninth filtering branch 129 is the same as the topology structure diagram of the tenth filtering branch 130, and is not described herein again.

The eleventh filtering branch 131 and the eighth filtering branch 128 are symmetrically arranged along the second direction D, specifically, as shown in fig. 1, the eleventh filtering branch 131 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the eleventh filtering branch 131 are a first filtering cavity K1, a second filtering cavity K2, a third filtering cavity K3, a fourth filtering cavity K4, a fifth filtering cavity K5, a sixth filtering cavity K6, and a seventh filtering cavity K7 of the eleventh filtering branch 131. The structure of the eleventh filtering branch 131 is the same as that of the second filtering branch 123, and is not described herein again.

The twelfth filtering branch 132 and the eleventh filtering branch 131 are symmetrically arranged along the second direction D, specifically, the twelfth filtering branch 132 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the twelfth filtering branch 132 are a first filtering cavity L1, a second filtering cavity L2, a third filtering cavity L3, a fourth filtering cavity L4, a fifth filtering cavity L5, a sixth filtering cavity L6 and a seventh filtering cavity L7 of the twelfth filtering branch 132. The structure of the twelfth filtering branch 132 is the same as that of the fourth filtering branch 124, and is not described herein again.

The topology structures of the eleventh filtering branch 131 and the twelfth filtering branch 132 are the same as the topology structure of the second filtering branch 123, and are not described herein again.

The housing 11 is further provided with a thirteenth port (not shown), a fourteenth port (not shown), a fifteenth port (not shown), a sixteenth port (not shown), a seventeenth port (not shown), and an eighteenth port (not shown), wherein the first filter cavity I1 of the ninth filter branch 129 is coupled to the thirteenth port, the first filter cavity K1 of the eleventh filter branch 131 is coupled to the thirteenth port, and the fifth filter cavity I5 of the ninth filter branch 129 is coupled to the fourteenth port. The seventh filter cavity K7 of the eleventh filter branch 131 is coupled to the fifteenth port. The first filtering cavity J1 of the tenth filtering branch 130 is coupled to the sixteenth port, the first filtering cavity L1 of the twelfth filtering branch 132 is coupled to the sixteenth port, the fifth filtering cavity J5 of the tenth filtering branch 130 is coupled to the seventeenth port, and the seventh filtering cavity L7 of the twelfth filtering branch 132 is coupled to the eighteenth port, wherein the thirteenth port, the fourteenth port, the fifteenth port, the sixteenth port, the seventeenth port, and the eighteenth port may be taps of the filter 10.

That is, in this embodiment, the ninth filtering branch 129 and the eleventh filtering branch 131 share the thirteenth port, and the tenth filtering branch 130 and the twelfth filtering branch 132 share the sixteenth port, so that the number of taps of the filter 10 can be reduced, the space occupied by the taps in the filter 10 can be reduced, the size of the filter 10 can be reduced, and the cost can be reduced.

The tuning index parameter of the ninth filtering branch 129 may be the same as the tuning index parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the ninth filtering branch 129 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the ninth filtering branch 129. The simulation result of the ninth filtering branch 129 in this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning indicator parameter of the tenth filtering branch 130 may be the same as the tuning indicator parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the tenth filtering branch 130 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the tenth filtering branch 130. The simulation result of the tenth filtering branch 130 of this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning index parameter of the eleventh filtering branch 131 may be the same as the tuning index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the eleventh filtering branch 131 is within a range from 1803MHz to 1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the eleventh filtering branch 131. The simulation result of the eleventh filtering branch 131 in this embodiment is the same as the frequency band curve 71 in fig. 5, and is not described herein again.

The tuning index parameter of the twelfth filtering branch 132 may be the same as the tuning index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the twelfth filtering branch 132 is within the range of 1803MHz-1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the twelfth filtering branch 132. The simulation result of the twelfth filtering branch 132 of this embodiment is the same as the frequency band curve 71 in fig. 5, and is not repeated here.

Further, the filter 10 may further include a thirteenth filtering branch 133, a fourteenth filtering branch 134, a fifteenth filtering branch 135 and a sixteenth filtering branch 136.

The thirteenth filtering branch 133 and the tenth filtering branch 130 are symmetrically disposed along the second direction D, as shown in fig. 1, the thirteenth filtering branch 133 is composed of five sequentially coupled filtering cavities, and the five filtering cavities of the thirteenth filtering branch 133 are the first filtering cavity M1, the second filtering cavity M2, the third filtering cavity M3, the fourth filtering cavity M4, and the fifth filtering cavity M5 of the thirteenth filtering branch 133. The structure of the thirteenth filtering branch 133 is the same as that of the first filtering branch 121, and is not described herein again.

The fourteenth filtering branch 134 and the thirteenth filtering branch 133 are symmetrically disposed along the second direction D, and specifically, as shown in fig. 1, the fourteenth filtering branch 134 is composed of five filtering cavities coupled in sequence. The five filter cavities of the fourteenth filter branch 134 are the first filter cavity N1, the second filter cavity N2, the third filter cavity N3, the fourth filter cavity N4 and the fifth filter cavity N5 of the fourteenth filter branch 134. The structure of the fourteenth filtering branch 134 is the same as that of the third filtering branch 122, and is not described herein again.

The topology structures of the thirteenth filtering branch 133 and the fourteenth filtering branch 134 are the same as the structure of the first filtering branch 121, and are not described herein again.

The fifteenth filtering branch 135 and the twelfth filtering branch 132 are symmetrically disposed along the second direction D. Specifically, as shown in fig. 1, the fifteenth filtering branch 135 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the fifteenth filtering branch 135 are a first filtering cavity P1, a second filtering cavity P2, a third filtering cavity P3, a fourth filtering cavity P4, a fifth filtering cavity P5, a sixth filtering cavity P6, and a seventh filtering cavity P7 of the fifteenth filtering branch 135. The structure of the fifteenth filtering branch 135 is the same as that of the second filtering branch 123, and is not described herein again.

The sixteenth filtering branch 136 and the fifteenth filtering branch 135 are symmetrically disposed along the second direction D, specifically, as shown in fig. 1, the sixteenth filtering branch 136 is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the sixteenth filtering branch 136 are a first filtering cavity Q1, a second filtering cavity Q2, a third filtering cavity Q3, a fourth filtering cavity Q4, a fifth filtering cavity Q5, a sixth filtering cavity Q6 and a seventh filtering cavity Q7 of the sixteenth filtering branch 136. The structure of the sixteenth filtering branch 136 is the same as that of the fourth filtering branch 134, and is not described herein again.

Wherein, the housing 11 is further provided with a nineteenth port (not shown), a twentieth port (not shown), a twenty-first port (not shown), a twenty-second port (not shown), a twenty-third port (not shown) and a twenty-fourth port (not shown), the first filter cavity M1 of the thirteenth filter branch 133 is coupled with the nineteenth port, the first filter cavity P1 of the fifteenth filter branch 135 is coupled with the nineteenth port, the fifth filter cavity M5 of the thirteenth filter branch 133 is coupled with the twentieth port, and the seventh filter cavity P7 of the fifteenth filter branch 135 is coupled with the twenty-first port. The first filter cavity N1 of the fourteenth filter branch 134 is coupled to the twentieth port, the first filter cavity Q1 of the sixteenth filter branch 136 is coupled to the twentieth port, the fifth filter cavity N5 of the fourteenth filter branch 135 is coupled to the twentieth port, and the seventh filter cavity Q7 of the sixteenth filter branch 136 is coupled to the twentieth port, wherein the nineteenth port, the twentieth port, the twenty-first port, the twenty-second port, the twenty-third port, and the twenty-fourth port may be taps of the filter 10.

That is, in this embodiment, the thirteenth filtering branch 133 and the fifteenth filtering branch 135 share the nineteenth port, and the fourteenth filtering branch 134 and the sixteenth filtering branch 136 share the twenty-second port, so that the number of taps of the filter 10 can be reduced, the space occupied by the taps in the filter 10 can be reduced, the size of the filter 10 can be reduced, and the cost can be reduced.

The tuning index parameter of the thirteenth filtering branch 133 may be the same as the tuning index parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the thirteenth filtering branch 133 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the thirteenth filtering branch 133. The simulation result of the thirteenth filtering branch 133 of this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The debugging index parameter of the fourteenth filtering branch 134 may be the same as the debugging index parameter of the first filtering branch 121, and is not described herein again. The simulated bandwidth of the fourteenth filtering branch 134 is within the range of 1708MHz-1737MHz, which meets the design requirement of the filter 10, and can accurately control the bandwidth of the fourteenth filtering branch 134. The simulation result of the fourteenth filtering branch 134 of this embodiment is the same as the frequency band curve 41 in fig. 4, and is not described herein again.

The tuning index parameter of the fifteenth filtering branch 135 may be the same as the tuning index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the fifteenth filtering branch 135 is within the range of 1803MHz-1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the fifteenth filtering branch 135. The simulation result of the fifteenth filtering branch 135 of the present embodiment is the same as the frequency band curve 71 in fig. 5, and is not repeated herein.

The debugging index parameter of the sixteenth filtering branch 136 may be the same as the debugging index parameter of the second filtering branch 123, and is not described herein again. The simulated bandwidth of the sixteenth filtering branch 136 is within the range of 1803MHz-1832MHz, which meets the design requirement of the filter 10 and can accurately control the bandwidth of the sixteenth filtering branch 136. The simulation result of the sixteenth filtering branch 136 in this embodiment is the same as the frequency band curve 71 in fig. 5, and is not repeated herein.

The present application further provides a communication device, as shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the communication device provided in the present application. The communication device of the present embodiment includes an antenna 62 and a radio frequency unit 61. The antenna 62 and the radio frequency unit 61 can be installed on a base station, and can also be installed on objects such as a street lamp; the antenna 62 is connected to a Radio Unit (RRU) 61. The radio frequency unit 61 comprises the filter disclosed in the above embodiments for filtering the radio frequency signal.

In other embodiments, the rf Unit 61 may be integrated with the Antenna 62 to form an Active Antenna Unit (AAU).

It should be noted that some embodiments of the present application refer to the present application as a filter, and may also be referred to as a combiner, that is, a dual-band combiner, and may also be referred to as a duplexer in other embodiments.

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 the first direction;

a first port disposed on the housing,

the first filtering branch circuit is coupled with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the first filtering branch circuit are divided into two rows which are arranged along the second direction;

and the second filtering branch circuit is coupled with the first port, consists of seven filtering cavities which are sequentially coupled and forms two cross-coupling zero points of the second filtering branch circuit, and the seven filtering cavities of the second filtering branch circuit are divided into two rows which are arranged along the second direction.

2. The filter of claim 1, wherein the first filter cavity of the first filter branch is coupled to the first port, wherein the first filter cavity of the second filter branch is coupled to the first port,

the first filtering branch and the second filtering branch are arranged at intervals along the first direction,

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

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

3. The filter of claim 2,

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

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

4. The filter according to claim 3, wherein the second filter cavity and the fifth filter cavity of the second filter branch are inductively cross-coupled, and the third filter cavity and the fifth filter cavity of the second filter branch are capacitively cross-coupled to form two cross-coupled zeros of the second filter branch.

5. The filter of claim 1, wherein the bandwidth of the first filtering branch is in a range of 1708MHz-1737 MHz; the bandwidth of the second filtering branch circuit ranges from 1803MHz to 1832 MHz.

6. The filter of claim 3, further comprising a third filtering branch and a fourth filtering branch, wherein the third filtering branch and the first filtering branch are symmetrically disposed along the second direction, and wherein the fourth filtering branch and the second filtering branch are symmetrically disposed along the second direction.

7. The filter of claim 3, further comprising a fifth filtering branch, a sixth filtering branch, a seventh filtering branch, and an eighth filtering branch,

the fifth filtering branch and the third filtering branch are symmetrically arranged along the second direction;

the sixth filtering branch and the fifth filtering branch are symmetrically arranged along the second direction;

the seventh filtering branch and the fourth filtering branch are symmetrically arranged along the second direction;

the eighth filtering branch and the seventh filtering branch are symmetrically arranged along the second direction.

8. The filter of claim 7, further comprising a ninth filtering branch, a tenth filtering branch, an eleventh filtering branch, and a twelfth filtering branch,

the ninth filtering branch and the sixth filtering branch are symmetrically arranged along the second direction;

the tenth filtering branch and the ninth filtering branch are symmetrically arranged along the second direction;

the eleventh filtering branch and the eighth filtering branch are symmetrically arranged along the second direction;

the twelfth filtering branch and the eleventh filtering branch are symmetrically arranged along the second direction.

9. The filter of claim 8, further comprising a thirteenth filtering branch, a fourteenth filtering branch, a fifteenth filtering branch, and a sixteenth filtering branch,

the thirteenth filtering branch and the tenth filtering branch are symmetrically arranged along the second direction;

the fourteenth filtering branch and the thirteenth filtering branch are symmetrically arranged along the second direction;

the fifteenth filtering branch and the twelfth filtering branch are symmetrically arranged along the second direction;

the sixteenth filtering branch and the fifteenth filtering branch are symmetrically arranged along the second direction.

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 radio frequency signals.