CN113131137A

CN113131137A - Communication equipment and filter

Info

Publication number: CN113131137A
Application number: CN201911404850.7A
Authority: CN
Inventors: 张海峰; 蔡永宏; 屈兵; 张宝真
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-16

Abstract

The application discloses communication equipment and wave filter, this wave filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of six filtering cavities which are sequentially coupled to form two inductive cross coupling zeros of the first filtering branch; and the second filtering branch is arranged on the shell, is adjacent to the first filtering branch and consists of five filtering cavities which are sequentially coupled to form two cross-coupling zero points of the second filtering branch. According to the application, the first filtering branch forms two inductive cross coupling zero points and the second filtering branch forms two cross coupling zero points, zero point suppression can be realized, the out-of-band suppression performance of the filter is improved, the isolation of the first filtering branch and the second filtering branch is improved, and the loss of the filter is reduced.

Description

Communication equipment and filter

Technical Field

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

Background

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

The inventor of the application finds that the filter is provided with multiple filtering branches in long-term research and development work, each filtering branch works in different bandwidth ranges, and the filtering branches with different bandwidths can affect each other.

Disclosure of Invention

The application provides a communication device and a filter, which are used for solving the problems of the filter in the prior art.

The present application provides a filter to solve the above technical problem, the filter comprising: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of six filtering cavities which are sequentially coupled to form two inductive cross-coupling zero points of the first filtering branch, and the bandwidth of the first filtering branch is positioned in the range of 697Mhz-799 Mhz; and the second filtering branch is arranged on the shell, is adjacent to the first filtering branch, consists of five filtering cavities which are sequentially coupled, forms two cross-coupling zero points of the second filtering branch, and has a bandwidth within the range of 823Mhz-895 Mhz.

The first filtering cavity to the fifth filtering cavity of the first filtering branch and the second filtering branch are divided into three rows which are sequentially arranged along the first direction; the first filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction; the second 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 second filtering branch circuit are in a row and are sequentially arranged along a second direction; the first filtering cavity, the second filtering cavity and the fifth filtering cavity of the second filtering branch are in a row and are sequentially arranged along the second direction. The first filtering cavity to the fifth filtering cavity of the first filtering branch and the second filtering branch are regularly distributed in three rows, so that the size of the filter can be reduced.

The first filter cavity of the first filter branch circuit is adjacent to the second filter cavity and the fourth filter cavity of the first filter branch circuit; a third filter cavity of the second filter branch is adjacent to a third filter cavity and a fifth filter cavity of the first filter branch, and a second filter cavity and a fourth filter cavity of the second filter branch; the sixth filter cavity of the first filter branch is far away from the median line of the shell in the first direction relative to the fifth filter cavity of the first filter branch, and an included angle between a connecting line of the center of the fifth filter cavity of the first filter branch and the center of the sixth filter cavity of the first filter branch and the median line is an acute angle. The plurality of filter cavities are arranged adjacently, so that the size of the filter can be reduced.

The first filter cavity of the first filter branch circuit is inductively cross-coupled with the third filter cavity of the first filter branch circuit, and the first filter cavity of the first filter branch circuit is inductively cross-coupled with the fourth filter cavity of the first filter branch circuit, so that two inductive cross-coupling zero points of the first filter branch circuit are formed; and the second filter cavity of the second filter branch circuit is inductively cross-coupled with the fifth filter cavity of the second filter branch circuit, and the second filter cavity of the second filter branch circuit is capacitively cross-coupled with the fourth filter cavity of the second filter branch circuit to form two cross-coupling zero points of the second filter branch circuit. The two inductive cross-coupling zeros of the first filtering branch and the two cross-coupling zeros of the second filtering branch can achieve the zero suppression effect, and the out-of-band suppression performance of the filter is improved.

Metal coupling ribs are respectively arranged between the first filtering cavity of the first filtering branch and the third filtering cavity of the first filtering branch and between the first filtering cavity of the first filtering branch and the fourth filtering cavity of the first filtering branch so as to form two inductive cross-coupling zeros of the first filtering branch; a metal coupling rib is arranged between the second filtering cavity of the second filtering branch and the fifth filtering cavity of the second filtering branch, and a flying rod is arranged between the second filtering cavity of the second filtering branch and the fourth filtering cavity of the second filtering branch so as to form two cross coupling zero points of the second filtering branch. The two inductive cross-coupling zeros of the first filtering branch and the two cross-coupling zeros of the second filtering branch can achieve the zero suppression effect, and the out-of-band suppression performance of the filter is improved.

The filter also comprises a third filtering branch which is arranged on the shell, is arranged at intervals with the second filtering branch and consists of seven filtering cavities which are sequentially coupled to form two inductive cross-coupling zeros of the third filtering branch, and the bandwidth of the third filtering branch is positioned in the range of 1694Mhz-2201 Mhz; and the fourth filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled, and the bandwidth of the fourth filtering branch is in the range of 2304Mhz-2361 Mhz. The two inductive cross-coupling zero points of the third filtering branch can improve the isolation between the third filtering branch and the fourth filtering branch and reduce the loss.

The third filtering branch circuit is divided into two rows arranged along the first direction; the first filtering cavity, the second filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the third filtering branch are in a row and are sequentially arranged along the second direction; and the third filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the third filtering branch are in a row and are arranged along the second direction. The third filtering branches are regularly distributed into two lines, so that the arrangement rule of the filters is compact, the size of the filters is reduced, and the production cost is reduced.

The first filter cavity of the third filter branch circuit is intersected with the second filter cavity of the third filter branch circuit; a third filter cavity of the third filter branch is respectively intersected with a second filter cavity and a fourth filter cavity of the third filter branch; a fifth filter cavity of the third filter branch is respectively intersected with a fourth filter cavity and a sixth filter cavity of the third filter branch; a seventh filter cavity of the third filter branch is adjacent to a sixth filter cavity of the third filter branch; inductive cross coupling is respectively carried out between the second filtering cavity of the third filtering branch and the fourth filtering cavity of the third filtering branch, and between the fifth filtering cavity of the third filtering branch and the seventh filtering cavity of the third filtering branch, so that two inductive cross coupling zeros of the third filtering branch are formed. The plurality of filter cavities are arranged adjacently or in an intersecting way, so that the size of the filter can be reduced; the two inductive cross-coupling zeros of the third filtering branch can achieve the zero suppression effect, and the out-of-band suppression performance of the filter is improved.

The second filter cavity of the fourth filter branch is close to the median line of the shell in the first direction relative to the first filter cavity of the fourth filter branch, and an included angle between a connecting line of the center of the second filter cavity of the fourth filter branch and the center of the first filter cavity of the fourth filter branch and the median line is an acute angle; a third filter cavity of the fourth filter branch is far away from a median line of the shell in the first direction relative to a second filter cavity of the fourth filter branch, and an included angle between a connecting line of the center of the second filter cavity of the fourth filter branch and the center of the third filter cavity of the fourth filter branch and the median line is an acute angle; the third filtering cavities and the fourth filtering cavities of the fourth filtering branch are in a row and are sequentially arranged along the second direction; the fourth filtering cavities and the fifth filtering cavities of the fourth filtering branch are in a row and are sequentially arranged along the first direction. And the third filtering cavity to the fifth filtering cavity of the fourth filtering branch circuit are regularly arranged, so that the size of the filter can be reduced.

The present application provides a communication device to solve the above technical problem, the communication device comprising an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter as described above for filtering a radio frequency signal.

The beneficial effect of this application is: different from the prior art, the two inductive cross coupling zeros are formed by the first filtering branch and the two cross coupling zeros are formed by the second filtering branch, so that the zero suppression effect can be realized, the out-of-band suppression performance of the filter is improved, the isolation of the first filtering branch and the isolation of the second filtering branch are improved, and the loss of the filter is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced 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 based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of a filter provided in the present application;

fig. 2 is a schematic diagram of a topology of a first filtering branch provided in the present application;

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

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

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

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

fig. 7 is a diagram of simulation results of a first filtering branch provided in the present application;

FIG. 8 is a diagram illustrating simulation results of a second filtering branch provided in the present application;

fig. 9 is a diagram of simulation results of a third filtering branch provided in the present application;

FIG. 10 is a graph of simulation results for a fourth filtering branch provided in the present application;

fig. 11 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "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 a filter according to a first embodiment of the present disclosure. The filter 1 comprises a housing 10, a first filter branch 20 and a second filter branch 30.

The housing 10 has a first direction i and a second direction ii, and the first direction i of the housing 10 and the second direction ii of the housing 10 are arranged perpendicularly.

The first filtering branch 20 is disposed on the housing 10 and is composed of six filtering cavities 21 coupled in sequence, and the six filtering cavities 21 further form two inductive cross-coupling zeros 22, as shown in fig. 1, which can implement zero suppression and facilitate debugging. Specifically, the six filter cavities 21 of the first filter branch 20 are specifically the first filter cavity a1 through the sixth filter cavity a6 of the first filter branch 20.

The second filtering branch 30 is disposed on the housing 10, is disposed adjacent to the first filtering branch 20, and is composed of five filtering cavities 31 coupled in sequence, and the five filtering cavities 31 further form two cross-coupling zeros 32, as shown in fig. 1, which can implement zero suppression and facilitate debugging. The five filter cavities 31 of the second filter branch 30 are specifically the first filter cavity B1 through the fifth filter cavity B5 of the second filter branch 30.

As shown in fig. 1, the first through fifth filter chambers a1 through a5 of the first filter branch 20 and the second filter branch 30 are divided into three rows sequentially arranged in the first direction i of the housing 10.

Specifically, the first filter cavity a1, the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 20 are in a row and are sequentially arranged along the second direction ii of the housing 10; the second filtering cavity a2 and the third filtering cavity A3 of the first filtering branch 20, and the third filtering cavity B3 and the fourth filtering cavity B4 of the second filtering branch 30 are in a row and are sequentially arranged along the second direction ii of the housing 10; the first filter cavity B1, the second filter cavity B2 and the fifth filter cavity B5 of the second filter branch 30 are in a row and are sequentially arranged along the second direction ii of the housing 10.

Moreover, the first filter cavity a1 of the first filter branch 20 is arranged adjacent to the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch 20; the third filter cavity B3 of the second filter branch 30 is disposed adjacent to the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 20, and the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 30.

The first filter cavity a1 through the fifth filter cavity a5 of the first filter branch 20 and the second filter branch 30 are regularly distributed in three rows, which can reduce the size of the filter 1.

As shown in fig. 1, the sixth filter cavity a6 of the first filter branch 20 is separated from the fifth filter cavity a5 of the first filter branch 20 toward the midline of the housing 10 in the first direction i, and an included angle between a connecting line of the center of the fifth filter cavity a5 of the first filter branch 20 and the center of the sixth filter cavity a6 of the first filter branch 20 and the midline is an acute angle.

Moreover, the fifth filtering cavity a5 of the first filtering branch 20 intersects with the cavity circle of the sixth filtering cavity a6 of the first filtering branch 20 to form a cavity circle intersecting region, the cavity circle intersecting region has two endpoints, which are an intersection point M and an intersection point N in fig. 1, respectively, a window is disposed in the cavity circle intersecting region, so that the fifth filtering cavity a5 of the first filtering branch 20 and the sixth filtering cavity a6 of the first filtering branch 20 form window coupling, and the width of the window is equal to the length of a connecting line MN between the intersection point M and the intersection point N. Through the intersection of the cavity circles of the fifth filter cavity A5 and the sixth filter cavity A6 and the arrangement of the window in the intersection area of the cavity circles, the distance between the centers of the fifth filter cavity A5 and the sixth filter cavity A6 can be reduced, and the coupling is enhanced.

Referring to fig. 1 and fig. 2, fig. 2 is a schematic diagram of a topology of a first filtering branch circuit according to the present application. Inductive cross-coupling is respectively performed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 20 and between the first filter cavity a1 and the fourth filter cavity a4 of the first filter branch 20 to form two inductive cross-coupling zeros 22 of the first filter branch 20.

Specifically, a window may be disposed between the first filter cavity a1 and the third filter cavity A3, and a metal coupling rib is disposed on the window, so that the first filter cavity a1 and the third filter cavity A3 realize inductive cross coupling, and form the inductive cross coupling zero 22 of the first filter branch 20, which is equivalent to the inductor L1 described in fig. 2. A window may be disposed between the first filter cavity a1 and the fourth filter cavity a4, and a metal coupling rib is disposed on the window, so that the first filter cavity a1 and the fourth filter cavity a4 realize inductive cross coupling, and an inductive cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L2 described in fig. 2. Because the metal coupling rib is slightly influenced by the change of the external temperature, the temperature drift of the filter 1 is avoided.

In this embodiment, the sizes of the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3, the fourth filtering cavity a4, the fifth filtering cavity a5 and the sixth filtering cavity a6 of the first filtering branch 20 may be the same, that is, the six filtering cavities 21 of the first filtering branch 20 may be equidistantly distributed, so that the layout and debugging are facilitated, and the consistency of the filter 1 is improved. Optionally, the six filter cavities 21 of the first filter branch 20 may be distributed at equal intervals, and metal coupling ribs with the same specification may be adopted to form two inductive cross-coupling zeros 22, so as to reduce the types of materials, facilitate manufacturing, reduce the complexity of the filter 1, and save cost.

Referring to fig. 1 and fig. 3, fig. 3 is a schematic diagram of a topology of a second filtering branch according to the present application. The second filter cavity B2 of the second filter branch 30 is capacitively cross-coupled to the fourth filter cavity B4, and the second filter cavity B2 of the second filter branch 30 is inductively cross-coupled to the fifth filter cavity B5, so as to form two cross-coupling zeros 32 of the second filter branch 30.

In particular, a window may be disposed between the second filter cavity B2 and the fourth filter cavity B4, and a flying bar may be disposed at the window to capacitively cross-couple the second filter cavity B2 and the fourth filter cavity B4 to form a cross-coupling zero 32 of the second filter branch 30, which is equivalent to the capacitor C described in fig. 3. A window may be disposed between the second filter cavity B2 and the fifth filter cavity B5, and a metal coupling rib is disposed on the window, so that the second filter cavity B2 and the fifth filter cavity B5 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L3 described in fig. 3. Because the metal coupling rib is slightly influenced by the change of the external temperature, the temperature drift of the filter 1 is avoided.

In this embodiment, the first filtering cavity B1, the second filtering cavity B2, the third filtering cavity B3, the fourth filtering cavity B4 and the fifth filtering cavity B5 of the second filtering branch 30 may have the same size, that is, the five filtering cavities 31 of the second filtering branch 30 may be equidistantly distributed, so that the layout and debugging are facilitated, and the consistency of the filter 1 is improved.

Optionally, the housing 10 is further provided with a first port (not shown), a second port (not shown), a third port (not shown), and a fourth port (not shown), the first filter cavity a1 of the first filter branch 20 is connected to the first port, the sixth filter cavity a6 of the first filter branch 20 is connected to the second port, the first filter cavity B1 of the second filter branch 30 is connected to the third port, and the fifth filter cavity B5 of the second filter branch 30 is connected to the fourth port. The first port, the second port, the third port and the fourth port may be taps of the filter 1 and are connected to an external connector.

Referring further to fig. 4, fig. 4 is a schematic structural diagram of a second embodiment of the filter provided in the present application. On the basis of the above embodiment, the filter 1 further comprises a third filtering branch 40 and a fourth filtering branch 50.

The third filtering branch 40 is disposed on the housing 10, spaced apart from the second filtering branch 30, and composed of seven filtering cavities 41 coupled in sequence, and the seven filtering cavities 41 further form two inductive cross-coupling zeros 42, as shown in fig. 4, which can implement zero suppression and facilitate debugging. The seven filter cavities 41 of the third filter branch 40 are specifically the first filter cavity C1 through the seventh filter cavity C7 of the third filter branch 40.

The fourth filtering branch 50 is disposed on the housing 10 and is composed of five filtering cavities 51 coupled in sequence. The five filter cavities 51 of the fourth filter branch 50 are specifically the first filter cavity D1 through the fifth filter cavity D5 of the fourth filter branch 50.

As shown in fig. 4, the seven filter cavities 41 of the third filter branch 40 are divided into two rows arranged in the first direction i of the housing 10.

Specifically, the first filter cavity C1, the second filter cavity C2, the fourth filter cavity C4 and the fifth filter cavity C5 of the third filter branch 40 are in a row and are sequentially arranged along the second direction ii of the housing 10; the third filter chamber C3, the sixth filter chamber C6 and the seventh filter chamber C7 of the third filter branch 40 are aligned in a row and are arranged along the second direction ii of the housing 10.

Moreover, the first filter cavity C1 of the third filter branch 40 intersects the second filter cavity C2 of the third filter branch 40; the third filter cavity C3 of the third filter branch 40 intersects with the second filter cavity C2 and the fourth filter cavity C4 of the third filter branch 40, respectively; the fifth filter cavity C5 of the third filter branch 40 intersects with the fourth filter cavity C4 and the sixth filter cavity C6 of the third filter branch 40, respectively; the seventh filter cavity C7 of the third filter branch 40 is disposed adjacent to the sixth filter cavity C6 of the third filter branch 40; the second filter cavity C2 of the third filter branch 40 is disposed adjacent to the fourth filter cavity C4 of the third filter branch 40.

Seven filter cavities 41 of the third filter branch 40 are regularly distributed in two rows, so that the size of the filter 1 can be reduced.

As shown in fig. 4, the second filter cavity D2 of the fourth filter branch 50 is close to the middle dividing line of the housing 10 in the first direction i relative to the first filter cavity D1 of the fourth filter branch 50, and an included angle between a connecting line of the center of the second filter cavity D2 of the fourth filter branch 50 and the center of the first filter cavity D1 of the fourth filter branch 50 and the middle dividing line is an acute angle; the third filter cavity D3 of the fourth filter branch 50 is separated from the second filter cavity D2 of the fourth filter branch 50 toward the middle dividing line of the housing 10 in the first direction i, and an included angle between a connecting line between the center of the second filter cavity D2 of the fourth filter branch 50 and the center of the third filter cavity D3 of the fourth filter branch 50 and the middle dividing line is an acute angle.

The third filtering cavity D3 and the fourth filtering cavity D4 of the fourth filtering branch 50 are in a row and are sequentially arranged along the second direction ii of the housing 10; the fourth filtering cavity D4 and the fifth filtering cavity D5 of the fourth filtering branch 50 are in a row and are sequentially arranged along the first direction i of the housing 10; the fourth filter cavity D4 and the fifth filter cavity D5 of the fourth filter branch 50 are intersected; the second filter cavity D2 of the fourth filter branch 50 and the fourth filter cavity C4 of the third filter branch 40 are adjacently disposed.

Referring to fig. 4 and 5, fig. 5 is a schematic diagram of a topology structure of a third filtering branch provided in the present application. The inductive cross-coupling between the second filter cavity C2 and the fourth filter cavity C4 of the third filter branch 40 and the inductive cross-coupling between the fifth filter cavity C5 and the seventh filter cavity C7 of the third filter branch 40 are respectively formed to form two inductive cross-coupling zeros 42 of the third filter branch 40.

Specifically, a window may be disposed between the second filter cavity C2 and the fourth filter cavity C4, and a metal coupling rib is disposed on the window, so that the second filter cavity C2 and the fourth filter cavity C4 realize inductive cross coupling, and an inductive cross coupling zero 42 of the third filter branch 40 is formed, which is equivalent to the inductor L4 described in fig. 5. A window may be disposed between the fifth filter cavity C5 and the seventh filter cavity C7, and a metal coupling rib is disposed on the window, so that the fifth filter cavity C5 and the seventh filter cavity C7 realize inductive cross coupling, and an inductive cross coupling zero 42 of the third filter branch 40 is formed, which is equivalent to the inductor L5 described in fig. 5. Because the metal coupling rib is slightly influenced by the change of the external temperature, the temperature drift of the filter 1 is avoided.

In this embodiment, the first filtering cavity C1, the second filtering cavity C2, the third filtering cavity C3, the fourth filtering cavity C4, the fifth filtering cavity C5, the sixth filtering cavity C6, and the seventh filtering cavity C7 of the third filtering branch 40 may have the same size, that is, the seven filtering cavities 41 of the third filtering branch 40 may be equidistantly distributed, so that the layout and debugging are facilitated, and the consistency of the filter 1 is improved. Optionally, the seven filter cavities 41 of the third filter branch 40 may be distributed at equal intervals, and metal coupling ribs with the same specification may be adopted to form two inductive cross-coupling zeros 42, so as to reduce the types of materials, facilitate manufacturing, reduce the complexity of the filter 1, and save cost.

Referring to fig. 4 and fig. 6, fig. 6 is a schematic diagram of a topology of a fourth filtering branch provided in the present application. The window coupling between the first filtering cavity D1 and the second filtering cavity D2, the window coupling between the second filtering cavity D2 and the third filtering cavity D3, the window coupling between the third filtering cavity D3 and the fourth filtering cavity D4, and the window coupling between the fourth filtering cavity D4 and the fifth filtering cavity D5 of the fourth filtering branch 50. The adjacent filter cavities of the fourth filter branch 50 are all coupled by windows, so that the fourth filter branch 50 has good consistency, other cross-coupling elements are not needed, and the cost is reduced.

Specifically, taking the window coupling between the first filtering cavity D1 and the second filtering cavity D2 of the fourth filtering branch 50 as an example, the first filtering cavity D1 and the second filtering cavity D2 are disposed at an interval, a first window (not shown) may be disposed on a side wall (not shown) of the first filtering cavity D1 close to the second filtering cavity D2, and a second window (not shown) corresponding to the first window is disposed on a side wall (not shown) of the second filtering cavity D2 close to the first filtering cavity D1, so as to implement the window coupling between the first filtering cavity D1 and the second filtering cavity D2.

Optionally, the housing 10 is further provided with a fifth port (not shown), a sixth port (not shown), a seventh port (not shown), and an eighth port (not shown), the first filter cavity C1 of the third filter branch 40 is connected to the fifth port, the seventh filter cavity C7 of the third filter branch 40 is connected to the sixth port, the first filter cavity D2 of the fourth filter branch 50 is connected to the seventh port, and the fifth filter cavity D5 of the fourth filter branch 50 is connected to the eighth port. And the fifth port, the sixth port, the seventh port and the eighth port can be taps of the filter 1 and are connected with an external connector.

The bandwidth of the first filtering branch 20 of this embodiment is in the range of 697Mhz-799 Mhz. Specifically, the coupling bandwidth between the first port and the first filter cavity A1 ranges from 115Mhz to 132 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 55Mhz to 66 Mhz; the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 ranges from 67Mhz to 79 Mhz; the coupling bandwidth between the first filter cavity a1 and the fourth filter cavity a4 ranges from 18Mhz to 25 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 25Mhz to 32 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 59Mhz to 70 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 63Mhz to 75 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 90Mhz to 105 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the second port ranges from 115Mhz to 132 Mhz; and the design requirements can be met.

Therefore, the resonant frequencies of the first filter cavity a1 through the sixth filter cavity a6 of the first filter branch 20 are sequentially located in the following ranges: 740Mhz-742Mhz, 794Mhz-796Mhz, 748Mhz-750Mhz, 737Mhz-739Mhz, 739Mhz-741Mhz, 740Mhz-742 Mhz. It can be seen that, while the bandwidth of the first filtering branch 20 is ensured to be within the range of 697Mhz-799Mhz, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 7, fig. 7 is a schematic diagram of simulation results of the first filtering branch circuit provided in the present application, and experimental tests show that the bandwidth of the first filtering branch circuit 20 of the present application is in the range of 697Mhz-799Mhz, as shown by the frequency band curve 70 in fig. 7. The first filtering branch 20 of the present application has a bandwidth suppression greater than or equal to 52dB between 824Mhz and 894Mhz, a bandwidth suppression greater than or equal to 52dB between 1695Mhz and 2200Mhz, and a bandwidth suppression greater than or equal to 52dB between 2305Mhz and 2360Mhz, so that the out-of-band suppression performance of the filter 1 can be improved. Wherein, a cross coupling zero point E of the first filtering branch 20 is located in the range of 840Mhz-860Mhz, the suppression is greater than 80dB, and the parameter design requirement of the filter 1 is met.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.

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.

The bandwidth of the second filtering branch 30 of the present embodiment is in the range of 823Mhz-895 Mhz. Specifically, the coupling bandwidth between the third port and the first filter cavity B1 ranges from 62Mhz to 74 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 28Mhz to 36 Mhz; the coupling bandwidth between the second filter cavity B2 and the fourth filter cavity B4 ranges from (-30) Mhz- (-23) Mhz; the coupling bandwidth between the second filter cavity B2 and the fifth filter cavity B5 ranges from 5Mhz to 10 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 25Mhz to 32 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the fourth port is in the range of 62Mhz-74Mhz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity B1 through the fifth filter cavity B5 of the second filter branch 30 are sequentially located in the following ranges: 858Mhz-860Mhz, 859Mhz-861Mhz, 833Mhz-835Mhz, 855Mhz-857Mhz, 858Mhz-860 Mhz. It can be seen that, while the bandwidth of the second filtering branch 30 is ensured to be within the range of 823Mhz-895Mhz, the resonant frequencies of the resonant cavities are substantially the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 8, fig. 8 is a schematic diagram of simulation results of the second filtering branch circuit provided in the present application, and through experimental tests, the bandwidth of the second filtering branch circuit 30 of the present application is in the range of 823Mhz-895Mhz, as shown by the frequency band curve 80 in fig. 8. The bandwidth suppression of the second filtering branch 30 located at 698Mhz-798Mhz is greater than or equal to 52dB, the bandwidth suppression located at 1695Mhz-2200Mhz is greater than or equal to 52dB, and the bandwidth suppression located at 2305Mhz-2360Mhz is greater than or equal to 52dB, so that the out-of-band suppression performance of the filter 1 can be improved. Wherein, a cross coupling zero point F of the second filtering branch 30 is located in the range of 780Mhz-790Mhz, the suppression is greater than 90dB, and the parameter design requirement of the filter 1 is met.

The bandwidth of the third filtering branch 40 of this embodiment is in the range 1694Mhz-2201 Mhz. In particular, the coupling bandwidth between the fifth port and the first filter cavity C1 ranges from 503Mhz to 564 Mhz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 399Mhz to 448 Mhz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 ranges from 234Mhz to 265 Mhz; the coupling bandwidth between the second filter cavity C2 and the fourth filter cavity C4 ranges from 149Mhz to 170 Mhz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 ranges from 212Mhz to 240 Mhz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 259Mhz to 292 Mhz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 ranges from 245Mhz to 277 Mhz; the coupling bandwidth between the fifth filter cavity C5 and the seventh filter cavity C7 ranges from 155Mhz to 177 Mhz; the coupling bandwidth between the sixth filter cavity C6 and the seventh filter cavity C7 ranges from 367Mhz to 413 Mhz; the coupling bandwidth between the seventh filtering cavity C7 and the sixth port ranges from 503Mhz to 564 Mhz; and the design requirements can be met.

Therefore, the resonant frequencies of the first filter cavity C1 through the seventh filter cavity C7 of the third filter branch 40 are sequentially located in the following ranges: 1924Mhz-1926Mhz, 1923Mhz-1925Mhz, 2081Mhz-2083Mhz, 1912Mhz-1914Mhz, 1905Mhz-1907Mhz, 2047Mhz-2049Mhz, 1924Mhz-1926 Mhz. Therefore, the bandwidth of the third filtering branch circuit 40 is ensured to be within the range of 1694Mhz-2201Mhz, and the resonant frequencies of all resonant cavities are basically the same, so that the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 9, fig. 9 is a schematic diagram of simulation results of the third filtering branch provided in the present application, and experimental tests show that the bandwidth of the third filtering branch 40 of the present application is in the range of 1694Mhz-2201Mhz, as shown by the frequency band curve 90 in fig. 9. The third filtering branch 40 of the present application has a bandwidth suppression greater than or equal to 52dB at 698Mhz-798Mhz, a bandwidth suppression greater than or equal to 52dB at 824Mhz-894Mhz, and a bandwidth suppression greater than or equal to 52dB at 2305Mhz-2360Mhz, so that the out-of-band suppression and other performances of the filter 1 can be improved. Wherein, a cross coupling zero point G of the third filtering branch 40 is located in the range of 2300Mhz to 2400Mhz, the suppression is greater than 80dB, and the parameter design requirement of the filter 1 is met.

The bandwidth of the fourth filtering branch 50 of this embodiment is in the range 2304Mhz-2361 Mhz. In particular, the coupling bandwidth between the seventh port and the first filter cavity D1 ranges from 79Mhz to 93 Mhz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 ranges from 63Mhz to 75 Mhz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 ranges from 44Mhz to 54 Mhz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 ranges from 44Mhz to 54 Mhz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 ranges from 63Mhz to 75 Mhz; the coupling bandwidth between the fifth filter cavity D5 and the eighth port is in the range of 79Mhz-93Mhz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity D1 through the fifth filter cavity D5 of the fourth filter branch 50 are sequentially located in the following ranges: 2328Mhz-2330Mhz, 2328Mhz-2330 Mhz. Therefore, the bandwidth of the fourth filtering branch 50 is ensured to be within the range of 2304Mhz-2361Mhz, and the resonant frequencies of all resonant cavities are basically the same, so that the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 10, fig. 10 is a schematic diagram of simulation results of the fourth filtering branch circuit provided in the present application, and experimental tests show that the bandwidth of the fourth filtering branch circuit 50 of the present application is in the range of 823Mhz-895Mhz, as shown by the frequency band curve 100 in fig. 10. The bandwidth suppression of the fourth filtering branch 50 located at 698Mhz-798Mhz is greater than or equal to 52dB, the bandwidth suppression located at 824Mhz-894Mhz is greater than or equal to 52dB, and the bandwidth suppression located at 1695Mhz-2200Mhz is greater than or equal to 52dB, so that the out-of-band suppression performance of the filter 1 can be improved.

The present application further provides a communication device, as shown in fig. 11, fig. 11 is a schematic structural diagram of an embodiment of the communication device provided in the present application. The communication device 110 includes an antenna 112 and a Radio Unit 111 (RRU), and the Radio Unit 111 is connected to the antenna 112. The radio frequency unit 111 comprises a filter 1 as shown in the above embodiments, the filter 1 being used for filtering the radio frequency signal. In other embodiments, the rf Unit 111 may be integrally designed with the Antenna 112 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters and may also be referred to as combiners, i.e., dual-frequency combiners.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of 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;

the first filtering branch is arranged on the shell and consists of six filtering cavities which are sequentially coupled to form two inductive cross-coupling zero points of the first filtering branch, and the bandwidth of the first filtering branch is positioned in the range of 697Mhz-799 Mhz;

and the second filtering branch is arranged on the shell, is adjacent to the first filtering branch and consists of five sequentially coupled filtering cavities to form two cross-coupling zero points of the second filtering branch, and the bandwidth of the second filtering branch is within the range of 823Mhz-895 Mhz.

2. The filter of claim 1,

the first filtering cavity to the fifth filtering cavity of the first filtering branch and the second filtering branch are divided into three rows which are sequentially arranged along the first direction;

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

the second 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 second filtering branch circuit are in a row and are sequentially arranged along the second direction;

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

3. The filter of claim 2,

the first filter cavity of the first filter branch circuit is adjacent to the second filter cavity and the fourth filter cavity of the first filter branch circuit;

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

the sixth filter cavity of the first filter branch is far away from the median line of the shell in the first direction relative to the fifth filter cavity of the first filter branch, and an included angle between a connecting line of the center of the fifth filter cavity of the first filter branch and the center of the sixth filter cavity of the first filter branch and the median line is an acute angle.

4. The filter of claim 3,

inductive cross coupling is respectively performed between a first filtering cavity of the first filtering branch and a third filtering cavity of the first filtering branch and between the first filtering cavity of the first filtering branch and a fourth filtering cavity of the first filtering branch so as to form two inductive cross coupling zeros of the first filtering branch;

and the second filter cavity of the second filter branch circuit is inductively cross-coupled with the fifth filter cavity of the second filter branch circuit, and the second filter cavity of the second filter branch circuit is capacitively cross-coupled with the fourth filter cavity of the second filter branch circuit to form two cross-coupling zeros of the second filter branch circuit.

5. The filter of claim 4,

metal coupling ribs are respectively arranged between a first filtering cavity of the first filtering branch and a third filtering cavity of the first filtering branch and between the first filtering cavity of the first filtering branch and a fourth filtering cavity of the first filtering branch so as to form two inductive cross-coupling zeros of the first filtering branch;

and a metal coupling rib is arranged between the second filtering cavity of the second filtering branch and the fifth filtering cavity of the second filtering branch, and a flying rod is arranged between the second filtering cavity of the second filtering branch and the fourth filtering cavity of the second filtering branch so as to form two cross coupling zero points of the second filtering branch.

6. The filter of any one of claims 1 to 5, further comprising a third filtering branch disposed on the housing, spaced apart from the second filtering branch, and composed of seven filtering cavities coupled in sequence, forming two inductive cross-coupling zeros of the third filtering branch, wherein a bandwidth of the third filtering branch is in a range of 1694Mhz-2201 Mhz;

and the fourth filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled, and the bandwidth of the fourth filtering branch is within the range of 2304Mhz-2361 Mhz.

7. The filter of claim 6,

the third filtering branch is divided into two columns arranged along the first direction;

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

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

8. The filter of claim 7,

the first filter cavity of the third filter branch circuit is intersected with the second filter cavity of the third filter branch circuit;

a third filter cavity of the third filter branch is respectively intersected with a second filter cavity and a fourth filter cavity of the third filter branch;

a fifth filter cavity of the third filter branch is respectively intersected with a fourth filter cavity and a sixth filter cavity of the third filter branch;

a seventh filter cavity of the third filter branch is adjacent to a sixth filter cavity of the third filter branch;

and the second filter cavity of the third filter branch and the fourth filter cavity of the third filter branch, and the fifth filter cavity of the third filter branch and the seventh filter cavity of the third filter branch are inductively cross-coupled to form two inductive cross-coupling zeros of the third filter branch.

9. The filter of claim 8,

a second filter cavity of the fourth filter branch approaches to a midline of the shell in the first direction relative to a first filter cavity of the fourth filter branch, and an included angle between a connecting line of the center of the second filter cavity of the fourth filter branch and the center of the first filter cavity of the fourth filter branch and the midline is an acute angle;

the third filter cavity of the fourth filter branch is far away from the median line of the shell in the first direction relative to the second filter cavity of the fourth filter branch, and an included angle between a connecting line of the center of the second filter cavity of the fourth filter branch and the center of the third filter cavity of the fourth filter branch and the median line is an acute angle;

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

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