CN113131160A

CN113131160A - Communication device and filter thereof

Info

Publication number: CN113131160A
Application number: CN201911423928.XA
Authority: CN
Inventors: 蔡永宏; 王伟曳; 刘建伟; 唐梦军
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16

Abstract

The application discloses a communication device and a filter thereof. The filter includes: the first common cavity is respectively coupled with a first filtering branch, a second filtering branch and a third filtering branch; the first filtering branch consists of five filtering cavities which are coupled in sequence; the second filtering branch consists of five filtering cavities which are coupled in sequence, and the five filtering cavities further form an inductive cross-coupling zero point; the third filtering branch consists of six filtering cavities which are coupled in sequence, and the six filtering cavities further form a capacitive cross-coupling zero point; the six filter cavities of the first common cavity, the five filter cavities of the first filter branch, the five filter cavities of the second filter branch and the six filter cavities of the third filter branch are divided into four rows arranged along the second direction; through the mode, the number of taps can be reduced through the arrangement of the common cavity, the size of the filter is reduced, the filter cavities are regularly arranged, the size of the filter is favorably reduced, zero point suppression is realized through the zero point of cross coupling, and the index debugging is facilitated.

Description

Communication device and filter thereof

Technical Field

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

Background

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

The inventor of the application finds that in long-term research and development work, in order to reduce the size of the filter, the filter is generally provided with two or more groups of filter branches with different frequencies, but each filter branch in the prior art needs to be provided with a tap independently, and the number of the taps is too large, so that the required welding points are too many, the size of the filter is not reduced, and the stability of the filter is influenced; the filter cavity arrangement in the existing filter is irregular, so that the filter is large in size, inconvenient to debug and high in production cost.

Disclosure of Invention

The application provides a filter to solve the filter of prior art and take a percentage in quantity too much, lead to required welding point also more, the filter chamber is arranged irregularly, leads to the filter bulky, the debugging of being not convenient for, technical problem that manufacturing cost is high.

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

the first common cavity, a first filtering branch, a second filtering branch and a third filtering branch which are respectively coupled with the first common cavity are arranged on the shell;

the first filtering branch consists of five filtering cavities which are coupled in sequence;

the second filtering branch consists of five filtering cavities which are coupled in sequence, and the five filtering cavities of the second filtering branch further form an inductive cross-coupling zero point;

the third filtering branch consists of six filtering cavities which are coupled in sequence, and the six filtering cavities of the third filtering branch further form a capacitive cross-coupling zero point;

and six filter cavities of the first common cavity, the five filter cavities of the first filter branch, the five filter cavities of the second filter branch and the six filter cavities of the third filter cavity are divided into four rows 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 as described above and is configured to filter a radio frequency signal.

Compared with the prior art, the filter of this application includes: a housing having a first direction and a second direction perpendicular to each other; the first common cavity, a first filtering branch, a second filtering branch and a third filtering branch which are respectively coupled with the first common cavity are arranged on the shell; the first filtering branch consists of five filtering cavities which are coupled in sequence; the second filtering branch consists of five filtering cavities which are coupled in sequence, and the five filtering cavities of the second filtering branch further form an inductive cross coupling zero point; the third filtering branch consists of six filtering cavities which are coupled in sequence, and the six filtering cavities of the third filtering branch further form a capacitive cross-coupling zero point; the six filter cavities of the first common cavity, the five filter cavities of the first filter branch, the five filter cavities of the second filter branch and the six filter cavities of the third filter branch are divided into four rows arranged along the second direction; through the mode, the filter is provided with the first common cavity, so that the number of taps can be reduced, required welding points are reduced, the size of the filter is reduced, debugging is facilitated, and the production cost is reduced; the zero point suppression can be realized by the cross coupling zero point, so that the indexes are convenient to debug and the design requirements are met; the filter cavities are regularly arranged, so that debugging and reduction of the size of the filter are facilitated.

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 second filtering branch provided in the present application;

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

FIG. 4 is a schematic diagram of another embodiment of a filter provided herein;

fig. 5 is a schematic diagram of a topology of a fifth filtering branch provided in the present application;

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

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

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

FIG. 9 is a diagram illustrating a third simulation result of the filter provided herein;

fig. 10 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

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

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

The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11, a first common cavity 12, and a first filtering branch 13, a second filtering branch 14, and a third filtering branch 15 respectively coupled to the first common cavity 12, and disposed on the housing 11. The first filtering branch 13, the second filtering branch 14 and the third filtering branch 15 may be a receiving filtering branch and a transmitting filtering branch, respectively, or may also be the receiving filtering branch or the transmitting filtering branch. The housing 11 has a first direction L and a second direction D, and the first direction L of the housing 11 is perpendicular to the second direction D of the housing 11.

And the first filtering branch 13 consists of five filtering cavities which are coupled in sequence. The second filtering branch 14 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the second filtering branch 14 further form an inductive cross-coupling zero 141. The third filtering branch 15 is composed of six filtering cavities coupled in sequence, and the six filtering cavities of the third filtering branch 15 further form a capacitive cross-coupling zero 151.

Wherein, the first common cavity 12, the five filter cavities of the first filter branch 13, the five filter cavities of the second filter branch 14 and the six filter cavities of the third filter cavity 15 are divided into four rows arranged along the second direction D.

In the embodiment, the first common cavity 12 of the filter 10 can reduce the number of taps, reduce the number of required welding points, reduce the size of the filter 10, facilitate debugging and reduce the production cost; the zero point suppression can be realized by the cross coupling zero point, so that the indexes are convenient to debug and the design requirements are met; the filter cavities are regularly arranged, so that debugging and size reduction of the filter 10 are facilitated.

The fourth filtering cavity a4 of the first filtering branch 13, the fifth filtering cavity C5 of the third filtering branch 15 and the sixth filtering cavity C6 are in a row and are sequentially arranged along the first direction L; the fifth filtering cavity a5, the third filtering cavity A3, the third filtering cavity C3 and the fourth filtering cavity C4 of the first filtering branch 13, the third filtering cavity C3526 and the fourth filtering cavity C4 are in a row and are sequentially arranged along the first direction L; the second filtering cavity a2 of the first filtering branch 13, the first filtering cavity C1 of the third filtering branch 15, the second filtering cavity C2 and the third filtering cavity B3 of the second filtering branch 14 are in a row and are sequentially arranged along the first direction L; the first filtering cavity a1, the first common cavity 12, the first filtering cavity B1, the second filtering cavity B2, the fourth filtering cavity B4 and the fifth filtering cavity B5 of the first filtering branch 13 are in a row and are sequentially arranged along the first direction L.

Further, the fifth filter cavity a5 of the first filter branch 13 is respectively disposed adjacent to the second filter cavity a2, the third filter cavity A3 and the fourth filter cavity a 4; the first filtering cavity C1 of the third filtering branch 15 is respectively adjacent to the second filtering cavity C2, the second filtering cavity a2 of the first filtering branch 13, the third filtering cavity A3, the first filtering cavity B1 of the second filtering branch 14 and the first common cavity 12; the second filtering cavity B2 of the second filtering branch 14 is respectively adjacent to the first filtering cavity B1, the third filtering cavity B3, the fourth filtering cavity B4 and the second filtering cavity C2 of the third filtering branch 15; the fourth filter cavity C4 of the third filter branch 15 is respectively adjacent to the third filter cavity C3, the fifth filter cavity C5, the sixth filter cavity C6 and the third filter cavity B3 of the second filter branch 14.

Wherein, the regular arrangement of five filter chambers of first filter branch 13, five filter chambers of second filter branch 14 and six filter chambers of third filter branch 15 can save the space in casing 11, is favorable to reducing the volume of wave filter 10, improves the stability of wave filter 10. Further, the sizes of the five filter cavities of the first filter branch 13, the five filter cavities of the second filter branch 14 and the six filter cavities of the third filter branch 15 are all the same, so that the first filter cavity a1 to the fifth filter cavity a5 of the first filter branch 13, the first filter cavity B1 to the fifth filter cavity B5 of the second filter branch 14 and the first filter cavity C1 to the sixth filter cavity C6 of the third filter branch 15 in the housing 11 can be distributed and arranged equidistantly, the distances between the centers of any two adjacent filter cavities are all the same, the arrangement is compact, the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

Further, as shown in fig. 2, the second filter cavity B2 of the second filter branch 14 is inductively cross-coupled with the fourth filter cavity B4 to form an inductive cross-coupling zero 141 of the second filter branch 14, such as the inductor L1 shown in fig. 2. The setting of the inductive cross-coupling zero 141 of the second filtering branch 14 can realize zero suppression, thereby facilitating the debugging of indexes and meeting the design requirements.

Specifically, a window may be disposed between the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the second filter cavity B2 and the fourth filter cavity B4, and an inductive cross coupling zero 141 is formed, which is equivalent to the inductor L1 in fig. 2. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

As shown in fig. 3, the third filter cavity C3 of the third filter branch 15 is capacitively cross-coupled with the fifth filter cavity C5 to form a capacitive cross-coupling zero 151 of the third filter branch 15, such as the capacitor C1 shown in fig. 3. The capacitive cross-coupling zero 151 of the third filtering branch 15 can realize zero suppression, so that the debugging indexes are facilitated, and the design requirements are met.

Specifically, a window may be disposed between the third filtering cavity C3 and the fifth filtering cavity C5 of the third filtering branch 15, and a capacitive fly rod may be disposed at the window, so as to implement capacitive cross coupling between the third filtering cavity C3 and the fifth filtering cavity C5, forming a capacitive cross coupling zero 151, which is equivalent to the capacitor C1 of fig. 3.

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

In the embodiment, the first common cavity 12 of the filter 10 can reduce the number of taps, reduce the number of required welding points, reduce the size of the filter 10, facilitate debugging and reduce the production cost; the zero point suppression can be realized by the cross coupling zero point, so that the indexes are convenient to debug and the design requirements are met; the filter cavities are regularly arranged, so that debugging and reduction of the size of the filter 10 are facilitated; five filter cavities of the first filter branch 13, five filter cavities of the second filter branch 14 and six filter cavities of the third filter branch 15 are regularly arranged, so that the space in the shell 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Furthermore, the sizes of the five filter cavities of the first filter branch 13, the five filter cavities of the second filter branch 14 and the six filter cavities of the third filter branch 15 are all the same, so that the first filter cavity a1 to the fifth filter cavity a5 of the first filter branch 13, the first filter cavity B1 to the fifth filter cavity B5 of the second filter branch 14 and the first filter cavity C1 to the sixth filter cavity C6 of the third filter branch 15 in the housing 11 can be distributed and arranged equidistantly, the distances between the centers of any two adjacent filter cavities are all the same, the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved; the arrangement of the inductive cross-coupling zero point 141 of the second filtering branch 14 and the capacitive cross-coupling zero point 151 of the third filtering branch 15 can realize zero point suppression, thereby facilitating the debugging of indexes and achieving the design requirements; in this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 of the present embodiment further includes, on the basis of the embodiment shown in fig. 1: the second common cavity 22, and a fourth filtering branch 23, a fifth filtering branch 24 and a sixth filtering branch 25 respectively coupled to the second common cavity 22 are disposed on the housing 11.

The fourth filtering branch 23 is composed of five filtering cavities which are coupled in sequence; the fifth filtering branch 24 is composed of five filtering cavities which are coupled in sequence, and the five filtering cavities of the fifth filtering branch 24 further form an inductive cross-coupling zero point 241; the sixth filtering branch 25 is composed of six filtering cavities coupled in sequence, and the six filtering cavities of the sixth filtering branch 25 further form a capacitive cross-coupling zero point 251.

The third filtering cavity D3, the second filtering cavity D2, the first filtering cavity D1 and the second common cavity 22 of the fourth filtering branch 23 are in a row and are sequentially arranged along the first direction L; the fourth filter cavity D4, the fifth filter cavity D5 of the fourth filter branch 23 and the first filter cavity E1 of the fifth filter branch 24 are in a row and are sequentially arranged along the first direction L; the third filter cavity E3 and the fourth filter cavity E4 of the fifth filter branch 24 are in a row and are sequentially arranged along the first direction L; the second filter cavity E2, the fifth filter cavity E5 of the fifth filter branch 24, the sixth filter cavity F6 and the fifth filter cavity F5 of the sixth filter branch 25 are in a row and are sequentially arranged along the first direction L; the first filter cavity F1, the second filter cavity F2, the third filter cavity F3 and the fourth filter cavity F4 of the sixth filter branch 25 are in a row and are sequentially arranged along the first direction L.

Further, the fifth filtering cavity D5 of the fourth filtering branch 23 is respectively disposed adjacent to the fourth filtering cavity D4, the second filtering cavity D2, the first filtering cavity D1 and the first filtering cavity E1 of the fifth filtering branch 24; the second filter cavity E2 of the fifth filter branch 24 is respectively adjacent to the first filter cavity E1, the third filter cavity E3, the fourth filter cavity E4, the fifth filter cavity E5 and the first filter cavity F1 of the sixth filter branch 25; the sixth filtering cavity F6 of the sixth filtering branch 25 is respectively adjacent to the fifth filtering cavity F5, the third filtering cavity F3, the second filtering cavity F2 and the fifth filtering cavity E5 of the fifth filtering branch 24; the third filter cavity E3 of the fifth filter branch 24 is further arranged adjacent to the fourth filter cavity a4 of the first filter branch 13.

Wherein, five filter chambers of the fourth filter branch 23, five filter chambers of the fifth filter branch 24 and six filter chambers of the sixth filter branch 25 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the five filter cavities of the fourth filter branch 23, the five filter cavities of the fifth filter branch 24 and the six filter cavities of the sixth filter branch 25 are all the same in size, so that the first filter cavity D1 to the fifth filter cavity D5 of the fourth filter branch 23, the first filter cavity E1 to the fifth filter cavity E5 of the fifth filter branch 24 and the first filter cavity F1 to the sixth filter cavity F6 of the sixth filter branch 25 in the housing 11 can be distributed and arranged at equal intervals, the distances between the centers of any two adjacent filter cavities are all equal, the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

As shown in fig. 5, the second filter cavity E2 of the fifth filter branch 24 is inductively cross-coupled with the fourth filter cavity E4 to form an inductive cross-coupling zero 241 of the fifth filter branch 24, such as the inductor L1 shown in fig. 5. The setting of the inductive cross-coupling zero point 241 of the fifth filtering branch 24 can realize zero point suppression, thereby facilitating the debugging of indexes and achieving the design requirements.

Specifically, a window may be disposed between the second filter cavity E2 and the fourth filter cavity E4 of the fifth filter branch 24, and a metal coupling rib is disposed on the window, so that the inductive cross-coupling is achieved between the second filter cavity E2 and the fourth filter cavity E4, and an inductive cross-coupling zero 141 is formed, which is equivalent to the inductor L1 in fig. 5. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

As shown in fig. 6, the third filter cavity F3 of the sixth filter branch 25 is capacitively cross-coupled to the fifth filter cavity F5 to form a capacitive cross-coupling zero 251 of the sixth filter branch 25, such as the capacitor C1 shown in fig. 6. The capacitive cross-coupling zero point 251 of the sixth filtering branch 25 is configured to achieve zero point suppression, so as to facilitate debugging indexes and meet design requirements.

Specifically, a window may be disposed between the third filter cavity F3 and the fifth filter cavity F5 of the sixth filter branch 25, and a capacitive fly rod may be disposed at the window, so as to implement capacitive cross coupling between the third filter cavity F3 and the fifth filter cavity F5, forming a capacitive cross coupling zero 251, which is equivalent to the capacitor C1 of fig. 6.

Optionally, the housing 11 is further provided with a first port (not shown), a second port (not shown), a third port (not shown), a fourth port (not shown), a fifth port (not shown), a sixth port (not shown), a seventh port (not shown), and an eighth port (not shown).

The first common cavity 12 is connected to the first port, the fifth filtering cavity a5 of the first filtering branch 13 is connected to the third port, the fifth filtering cavity B5 of the second filtering branch 14 is connected to the fourth port, and the sixth filtering cavity C6 of the third filtering branch 15 is connected to the fifth port; the second common cavity 22 is connected to the second port, the fifth filter cavity D5 of the fourth filter branch 23 is connected to the sixth port, the fifth filter cavity E5 of the fifth filter branch 24 is connected to the seventh port, and the sixth filter cavity F6 of the sixth filter branch 25 is connected to the eighth port.

The first to eighth ports may be taps of the filter 10.

The bandwidth of the first filtering branch 13 of the present embodiment is in the range of 3396Mhz-3604 Mhz. In particular, the coupling bandwidth between the first common cavity 12 and the first filter cavity a1 of the first filter branch 13 ranges from 187Mhz to 213 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 13 ranges from 158Mhz to 180 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the first filter branch 13 ranges from 115Mhz to 132 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 13 ranges from 115Mhz to 132 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 13 ranges from 158Mhz to 180 Mhz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 13 and the third port ranges from 187Mhz to 213 Mhz.

The bandwidth parameter of the fourth filtering branch 23 is consistent with the bandwidth parameter of the first filtering branch 13, and is not described herein again.

The bandwidth of the second filtering branch 14 of this embodiment lies in the range 1704Mhz-1886 Mhz. In particular, the coupling bandwidth between the first common cavity 12 and the first filter cavity B1 of the second filter branch 14 ranges from 162Mhz to 185 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 of the second filter branch 14 ranges from 136Mhz-156 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 of the second filter branch 14 ranges from 83Mhz to 97 Mhz; the coupling bandwidth between the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 14 ranges from 53Mhz to 64 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 of the second filter branch 14 ranges from 83Mhz to 97 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 14 ranges from 136Mhz-156 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the fourth port of the second filter branch 14 is in the range 162Mhz-185 Mhz.

The bandwidth parameter of the fifth filtering branch 24 is consistent with the bandwidth parameter of the second filtering branch 14, and is not described herein again.

The bandwidth of the third filtering branch 15 of this embodiment lies in the range of 1853Mhz-1878 Mhz. In particular, the coupling bandwidth between the first common cavity 12 and the first filter cavity C1 of the third filter branch 15 ranges from 202Mhz to 229 Mhz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 of the third filter branch 15 ranges from 181Mhz to 206 Mhz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 of the third filter branch 15 ranges from 135Mhz to 155 Mhz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 of the third filter branch 15 ranges from 102Mhz to 118 Mhz; the coupling bandwidth between the third filter cavity C3 and the fifth filter cavity C5 of the third filter branch 15 ranges from-93 Mhz to-79 Mhz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 of the third filter branch 15 ranges from 107Mhz to 124 Mhz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 of the third filter branch 15 ranges from 181Mhz to 206 Mhz; the coupling bandwidth between the sixth filter cavity C6 and the fifth port of the third filter branch 15 ranges from 202Mhz to 229 Mhz.

Therefore, the resonant frequencies of the first filter cavity a1 through the fifth filter cavity a5 of the first filter branch 13 are sequentially located in the following ranges: 3497Mhz-3499Mhz, 3497Mhz-3499 Mhz.

The frequency parameter of the fourth filtering branch 23 is consistent with the frequency parameter of the first filtering branch 13, and is not described herein again.

The resonant frequencies of the first filter cavity B1 through the fifth filter cavity B5 of the second filter branch 14 are in the following ranges in sequence: 1788Mhz-1790Mhz, 1787Mhz-1789Mhz, 1844Mhz-1846Mhz, 1787Mhz-1789Mhz, 1788Mhz-1790 Mhz.

The frequency parameter of the fifth filtering branch 24 is consistent with the frequency parameter of the second filtering branch 14, and is not described herein again.

The resonant frequencies of the first filter cavity C1 through the sixth filter cavity C6 of the third filter branch 15 are sequentially in the following ranges: 2042Mhz-2044Mhz, 2044Mhz-2046Mhz, 1959Mhz-1961Mhz, 2042Mhz-2044 Mhz.

The frequency parameter of the sixth filtering branch 25 is consistent with the frequency parameter of the third filtering branch 15, and is not described herein again.

It can be seen that the resonant frequencies of the filter cavities of the first filter branch 13 and the fourth filter branch 23 are completely consistent; the resonant frequencies of the filter cavities of the second filter branch 14 and the fifth filter branch 24 are completely consistent; the resonant frequencies of the filter cavities of the third filter branch 15 and the sixth filter branch 25 are completely consistent; the convenience of manufacturing and debugging the filter 10 is improved, namely the filter can be manufactured by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 7, fig. 7 is a schematic diagram of a first simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the first filtering branch 13 and the fourth filtering branch 23 of the present application are in the range of 3396Mhz-3604Mhz, as shown by the frequency band curve 31 in fig. 7. The bandwidth rejection of the band curve 31 is greater than 30dB in the frequency range below 3300Mhz, and the bandwidth rejection of the band curve 31 is greater than 28dB in the frequency range above 3700 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

As shown in fig. 8, fig. 8 is a schematic diagram of a second simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the second filtering branch 14 and the fifth filtering branch 24 of the present application are within a range of 1704Mhz1884Mhz, as shown by the frequency band curve 32 in fig. 8. The bandwidth rejection of band curve 32 is greater than or equal to 42dB over the frequency range of 0.009Mhz-965Mhz, the bandwidth rejection of band curve 32 is greater than or equal to 27dB over the frequency range of 1917Mhz-2173Mhz, the bandwidth rejection of band curve 32 is greater than or equal to 27dB over the frequency range of 2297Mhz-2693Mhz, and the bandwidth rejection of band curve 32 is greater than or equal to 27dB over the frequency range of 3397Mhz-3803 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 32 in fig. 8, one inductive cross-coupling zero 141 of the second filtering branch 14 is zero a, and the frequency of the zero a is 1922Mhz, where the bandwidth rejection is greater than 60 dB.

As shown in fig. 9, fig. 9 is a schematic diagram of a third simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the third filtering branch 15 and the sixth filtering branch 25 of the present application are in the range of 1914Mhz-2176Mhz, as shown by the frequency band curve 33 in fig. 9. The bandwidth rejection of the band curve 33 is greater than 45dB in the frequency range below 1800Mhz, and the bandwidth rejection of the band curve 33 is greater than 34dB in the frequency range above 2300 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 33 in fig. 9, one capacitive cross-coupling zero 151 of the third filtering branch 15 is zero B, and the frequency of the zero B is 1888Mhz, where the bandwidth rejection is greater than 56 dB.

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

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

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

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

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

Claims

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

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

2. The filter of claim 1,

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

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

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

the first filtering cavity of the first filtering branch, the first common cavity, the first filtering cavity, the second filtering cavity, the fourth filtering cavity and the fifth 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,

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

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

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

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

4. The filter of claim 3,

the second filter cavity and the fourth filter cavity of the second filter branch are inductively cross-coupled to form an inductive cross-coupling zero point of the second filter branch;

and the third filter cavity and the fifth filter cavity of the third filter branch are capacitively and cross-coupled to form a capacitive cross-coupling zero point of the third filter branch.

5. The filter of claim 4, further comprising:

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

the fourth filtering branch consists of five filtering cavities which are coupled in sequence;

the fifth filtering branch consists of five filtering cavities which are coupled in sequence, and the five filtering cavities of the fifth filtering branch further form an inductive cross-coupling zero point;

the sixth filtering branch is composed of six filtering cavities which are coupled in sequence, and the six filtering cavities of the sixth filtering branch further form a capacitive cross-coupling zero point.

6. The filter of claim 5,

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

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

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

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

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

7. The filter of claim 6,

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

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

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

the third filter cavity of the fifth filter branch is further arranged adjacent to the fourth filter cavity of the first filter branch.

8. The filter of claim 7,

the second filter cavity and the fourth filter cavity of the fifth filter branch are inductively cross-coupled to form an inductive cross-coupling zero point of the fifth filter branch;

and the third filter cavity and the fifth filter cavity of the sixth filter branch are capacitively cross-coupled to form a capacitive cross-coupling zero point of the sixth filter branch.

9. The filter of claim 8,

the bandwidths of the first filtering branch and the fourth filtering branch are in the range of 3396Mhz-3604Mhz, the bandwidths of the second filtering branch and the fifth filtering branch are in the range of 1704Mhz-1886Mhz, and the bandwidths of the third filtering branch and the sixth filtering branch are in the range of 1914Mhz-2176 Mhz.

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