CN113131131A

CN113131131A - Filter and communication equipment

Info

Publication number: CN113131131A
Application number: CN201911399842.8A
Authority: CN
Inventors: 蔡永宏; 李华; 魏元亮; 钟志波
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 a filter and communication equipment. The 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 ten filtering cavities which are sequentially coupled along a first coupling path, and four coupling zeros of the first filtering branch are formed; the distance between the center of the nth filter of the first filtering branch and the center of the (n +1) th filter is the sum of the radius of the nth filter of the first filtering branch and the radius of the (n +1) th filter, and n is greater than zero and less than or equal to 9. Through the mode, the arrangement space of the first filtering branch can be reduced, the size of the filter can be reduced, and the cost is saved.

Description

Filter and communication equipment

Technical Field

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

Background

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

The inventor of the present application found in long-term research and development work that the volume of the existing filter is significantly increased as the number of filter cavities is increased, resulting in a larger volume of the filter.

Disclosure of Invention

The application provides a filter and communication equipment to effectively reduce the volume of the filter and save cost.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a first coupling path, and four coupling zeros of the first filtering branch are formed; the distance between the center of the nth filter and the center of the (n +1) th filter of the first filtering branch is the sum of the radius of the nth filter and the radius of the (n +1) th filter of the first filtering branch, and n is greater than zero and less than or equal to 9.

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

The beneficial effects of the embodiment of the application are that: different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a first coupling path, and four coupling zeros of the first filtering branch are formed; the distance between the center of the nth filter of the first filtering branch and the center of the (n +1) th filter is the sum of the radius of the nth filter of the first filtering branch and the radius of the (n +1) th filter, and n is greater than zero and less than or equal to 9. Through this way, the distance between two filter cavities of the first filter branch of the filter cascaded along the first coupling path in the embodiment of the present application is equal to the sum of the radii of the two filter cavities, that is, the two filter cavities cascaded along the first coupling path are adjacently arranged, so that the filter cavities of the first filter branch can be arranged more compactly, the arrangement space of the first filter branch can be reduced, the size of the filter can be reduced, and the cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

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

FIG. 2 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application;

FIG. 3 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application;

FIG. 4 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

FIG. 5 is a schematic diagram of another embodiment of the filter of the present application;

FIG. 6 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application;

FIG. 7 is a diagram illustrating simulation results of a first filtering branch in an embodiment of the filter of the present application;

FIG. 8 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application;

FIG. 9 is a diagram illustrating simulation results of a third filtering branch in an embodiment of the filter of the present application;

FIG. 10 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application;

FIG. 11 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application;

FIG. 12 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application;

FIG. 13 is a diagram illustrating simulation results of a sixth filtering branch in an embodiment of the filter of the present application;

fig. 14 is a schematic structural diagram of an embodiment of the communication device of the present application.

Detailed Description

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

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

The present application first proposes a filter, as shown in fig. 1 to 4, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 2 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 3 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application; fig. 4 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes: the filter comprises a shell 11, a first filtering branch 12 and a second filtering branch 13, wherein the shell 11 has a first direction x and a second direction y which are perpendicular; the first filtering branch 12 is arranged on the housing 11, the first filtering branch 12 is composed of ten filtering cavities a1-a10 coupled in sequence along a first coupling path, and the ten filtering cavities a1-a10 further form four coupling zeros of the first filtering branch 12; the distance between the center of the nth filter An of the first filtering branch and the center of the (n +1) th filter A (n +1) is the sum of the radius of the nth filter An of the first filtering branch and the radius of the (n +1) th filter A (n +1), n is greater than zero and less than or equal to 9, namely, the nth filter An is arranged adjacent to the (n +1) th filter A (n + 1).

As shown in fig. 1, the ten filter cavities a1-a10 of the first filter branch 12 include: a first filtering cavity A1, a second filtering cavity A2, a third filtering cavity A3, a fourth filtering cavity A4, a fifth filtering cavity A5, a sixth filtering cavity A6, a seventh filtering cavity A7, an eighth filtering cavity A8, a ninth filtering cavity A9 and a tenth filtering cavity A10; the ten filter cavities a1-a10 of the first filter branch 12 are cascaded in sequence along the first coupling path, and the two cascaded filter cavities are arranged adjacently.

Different from the prior art, the distance between the two filter cavities of the first filter branch 12 cascaded along the first coupling path in the embodiment is equal to the sum of the radii of the two filter cavities, that is, the two filter cavities cascaded along the first coupling path are adjacently arranged, so that the filter cavities of the first filter branch 12 are arranged more compactly, the arrangement space of the first filter branch 12 can be reduced, the size of the filter 10 can be reduced, and the cost is saved.

And the coupling zero of the first filtering branch 12 can improve the out-of-band rejection and other characteristics of the filtering signal of the first filtering branch 12.

Alternatively, as shown in fig. 1, the first filter cavity a1 of the first filter branch 12 to the tenth filter cavity a10 of the first filter branch 12 are divided into two columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3, the sixth filtering cavity a6, the seventh filtering cavity a7 and the tenth filtering cavity a10 of the first filtering branch 12 are in a row and are sequentially and adjacently arranged along the second direction y; the fourth filtering cavity a4, the fifth filtering cavity a5, the eighth filtering cavity A8 and the ninth filtering cavity a9 of the first filtering branch 12 are in a row and are sequentially and adjacently arranged along the second direction y; the fourth filtering cavity a4 of the first filtering branch 12 is further disposed adjacent to the third filtering cavity A3 of the first filtering branch 12 and the sixth filtering cavity a6 of the first filtering branch 12, respectively, and the eighth filtering cavity A8 of the first filtering branch 12 is further disposed adjacent to the seventh filtering cavity a7 of the first filtering branch 12 and the tenth filtering cavity a10 of the first filtering branch 12.

As can be seen from the above analysis, two rows of filter cavities of the first filter branch 12 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, and the two rows of filter cavities are alternately disposed, so that the arrangement space of the first filter branch 12 can be reduced.

Further, as shown in fig. 1, the ten filter cavities a1-a10 of the first filter branch 12 are all the same in size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are all the same, so that the cavity array of the first filter branch 12 can be more compact, and the arrangement space of the first filter branch 12 can be reduced.

Optionally, as shown in fig. 1, capacitive cross coupling is respectively performed between the fourth filter cavity a4 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, between the seventh filter cavity a7 of the first filter branch 12 and the tenth filter cavity a10 of the first filter branch 12, and between the eighth filter cavity A8 of the first filter branch 12 and the tenth filter cavity a10 of the first filter branch 12, so as to form three capacitive coupling zeros of the first filter branch 12, and inductive cross coupling is performed between the third filter cavity A3 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, so as to form one inductive coupling zero of the first filter branch 12.

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

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. As shown in fig. 2, a flying bar (equivalent to the capacitor C1 shown in fig. 2) is disposed between the fourth filter cavity a4 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, a flying bar (equivalent to the capacitor C2 shown in fig. 2) is disposed between the seventh filter cavity a7 of the first filter branch 12 and the tenth filter cavity a10 of the first filter branch 12, and a flying bar (equivalent to the capacitor C3 shown in fig. 2) is disposed between the eighth filter cavity A8 of the first filter branch 12 and the tenth filter cavity a10 of the first filter branch 12. As can be seen from the above analysis, the distance between the fourth filter cavity a4 and the sixth filter cavity a6, the distance between the seventh filter cavity a7 and the tenth filter cavity a10, and the distance between the eighth filter cavity A8 and the tenth filter cavity a10 are equal, so that the flying rod elements with the same specification can be used to achieve the effect of implementing the three capacitive coupling zeros of the first filter branch 12. When the first filtering branch 12 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

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

Optionally, as shown in fig. 1, the second filtering branch 13 is composed of ten filtering cavities B1-B10 coupled in sequence along the second coupling path, the ten filtering cavities B1-B10 further form four coupling zeros of the second filtering branch 13, and the coupling zeros of the first filtering branch 12 can improve the out-of-band rejection and other characteristics of the filtered signal of the first filtering branch 12; the second filtering branch 13 and the first filtering branch 12 are arranged at an interval, so that crosstalk between the filtering signal of the second filtering branch 13 and the filtering signal of the first filtering branch 12 can be reduced.

As shown in fig. 1, the ten filter cavities B1-B10 of the second filter branch 13 include: a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4, a fifth filter cavity B5, a sixth filter cavity B6, a seventh filter cavity B7, an eighth filter cavity B8, a ninth filter cavity B9 and a tenth filter cavity B10.

As shown in fig. 1, the fourth filter cavity B4 of the second filter branch 13 to the tenth filter cavity B10 of the second filter branch 13 are divided into two columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the fourth filtering cavity B4, the fifth filtering cavity B5, the sixth filtering cavity B6, the ninth filtering cavity B9 and the tenth filtering cavity B10 of the second filtering branch 13 are in a row and are sequentially and adjacently arranged along the second direction y, and the seventh filtering cavity B7 and the eighth filtering cavity B8 of the second filtering branch 13 are in a row and are sequentially and adjacently arranged along the second direction y; the seventh filter cavity B7 of the second filter branch 13 is further disposed adjacent to the sixth filter cavity B6 of the second filter branch 13 and the ninth filter cavity B9 of the second filter branch 13; the fourth filter cavity B4 of the second filter branch 13 is further disposed adjacent to the first filter cavity B1 of the second filter branch 13 and the third filter cavity B3 of the second filter branch 13, respectively, the second filter cavity B2 of the second filter branch 13 is further disposed adjacent to the first filter cavity B1 of the second filter branch 13 and the third filter cavity B3 of the second filter branch 13, respectively, and the projection of the center of the fourth filter cavity B4 of the second filter branch 13 in the first direction x is located between the projection of the center of the first filter cavity B1 of the second filter branch 13 in the first direction x and the projection of the center of the second filter cavity B2 of the second filter branch 13 in the first direction x, and the projection of the center of the first filter cavity B1 of the second filter branch 13 in the second direction y is located between the projection of the center of the fourth filter cavity B4 of the second filter branch 13 in the second direction y and the projection of the center of the second filter cavity B2 of the second filter branch 13 in the second direction y.

As can be seen from the above analysis, two rows of filter cavities of the second filter branch 13 are adjacently disposed, a plurality of filter cavities in each row are sequentially adjacently disposed, and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the second filter branch 13 can be reduced; and the first four filtering cavities are prismatic and arranged two by two adjacently, so that the arrangement space of the second filtering branch 13 in the second direction y can be reduced.

Further, as shown in fig. 1, the ten filter cavities B1-B10 of the second filter branch 13 have the same size, and as can be seen from the arrangement of the filter cavities, except for the second filter cavity B2, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity rows of the second filter branch 13 can be made more compact, and the arrangement space of the second filter branch 13 can be reduced.

As shown in fig. 1, the second filtering cavity B2 of the second filtering branch 13 is respectively intersected with the first filtering cavity B1 and the third filtering cavity B3, and by the intersection of the filtering cavities, a partition wall is required to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing process can be simplified.

Optionally, as shown in fig. 1, capacitive cross coupling is performed between the first filter cavity B1 of the second filter branch 13 and the third filter cavity B3 of the second filter branch 13 to form one capacitive coupling zero of the second filter branch 13, and inductive cross coupling is performed between the first filter cavity B1 of the second filter branch 13 and the fourth filter cavity B4 of the second filter branch 13, between the sixth filter cavity B6 of the second filter branch 13 and the ninth filter cavity B9 of the second filter branch 13, and between the seventh filter cavity B7 of the second filter branch 13 and the ninth filter cavity B9 of the second filter branch 13 to form three inductive coupling zeros of the second filter branch 13.

As shown in fig. 3, a flying bar (equivalent to the capacitor C4 shown in fig. 3) is provided between the first filter cavity B1 of the second filter branch 13 and the third filter cavity B3 of the second filter branch 13.

As shown in fig. 3, a window and a metal coupling rib (equivalent to the capacitor L2 shown in fig. 3) are disposed between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 13, a window and a metal coupling rib (equivalent to the capacitor L3 shown in fig. 3) are disposed between the sixth filter cavity B6 and the ninth filter cavity B9 of the second filter branch 13, and a window and a metal coupling rib (equivalent to the capacitor L4 shown in fig. 3) are disposed between the seventh filter cavity B7 and the ninth filter cavity B9 of the second filter branch 13. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subjected to a small change of the external temperature, so as to reduce the temperature drift of the filter 10.

Optionally, the housing 11 is further provided with a first port (not shown), a second port (not shown), a fifth port (not shown) and a sixth port (not shown), wherein the first port is connected to the first filtering cavity a1 of the first filtering branch 12, the second port is connected to the tenth filtering cavity a10 of the first filtering branch 12, the fifth port is connected to the first filtering cavity B1 of the second filtering branch 13, and the sixth port is connected to the tenth filtering cavity B10 of the second filtering branch 13; the ports are used for filtering signal transmission.

As shown in fig. 1, in the first filter branch 12, the coupling bandwidth between the first port of the present embodiment and the first filter cavity a1 is in the range of 157MHz to 179 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 ranges from 125MHz to 143 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 86MHz to 100 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 is in the range of 74MHz-87 MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity A6 is in the range of 25MHz-32 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 24MHz to 31 MHz; the coupling bandwidth between the fourth filter cavity a4 and the sixth filter cavity a6 is in the range of (-63) MHz- (-73) MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 36MHz to 44 MHz; the coupling bandwidth between the sixth filtering cavity A6 and the seventh filtering cavity A7 ranges from 78MHz to 91 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 79MHz to 93 MHz; the coupling bandwidth between the seventh filter cavity a7 and the tenth filter cavity a10 is in the range of 25MHz-32 MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 34MHz to 42 MHz; the coupling bandwidth between the eighth filter cavity A8 and the tenth filter cavity a10 ranges from 94MHz to 108 MHz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 76MHz to 89 MHz; the coupling bandwidth between the tenth filter cavity a10 and the second port is in the range of 157MHz to 179MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity a1 to the tenth filtering cavity a10 of the first filter branch 12 are sequentially in the following ranges: 2593MHz-2595MHz, 2568MHz-2570MHz, 2520MHz-2522MHz, 2592MHz-2594MHz, 2589MHz-2591MHz, 2603MHz-2605MHz, 2665MHz-2667MHz and 2593MHz-2595 MHz.

Therefore, the resonant frequencies of the filter 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. 1, in the second filter branch 13, the coupling bandwidth between the fifth port and the first filter cavity B1 of the present embodiment is in the range of 157MHz to 179 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 54MHz to 65 MHz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 is in the range of (-116) MHz- (-101) MHz; the coupling bandwidth between the first filter cavity B1 and the fourth filter cavity B4 ranges from 45MHz to 54 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 16MHz to 22 MHz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 75MHz to 87 MHz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 78MHz to 91 MHz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 77MHz to 90 MHz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 76MHz to 90 MHz; the coupling bandwidth between the sixth filter cavity B6 and the ninth filter cavity B9 ranges from 15MHz to 21 MHz; the coupling bandwidth between the seventh filter cavity B7 and the eighth filter cavity B8 ranges from 39MHz to 47 MHz; the coupling bandwidth between the seventh filter cavity B7 and the ninth filter cavity B9 ranges from 63MHz to 74 MHz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 ranges from 55MHz to 65 MHz; the coupling bandwidth between the ninth filter cavity B9 and the tenth filter cavity B10 ranges from 125MHz to 143 MHz; the coupling bandwidth between the tenth filtering cavity B10 and the sixth port ranges from 157MHz to 179MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity B1 to the tenth filtering cavity B10 of the second filter branch 13 are sequentially in the following ranges: 2593MHz-2595MHz, 2515MHz-2517MHz, 2565MHz-2567MHz, 2599MHz-2561MHz, 2594MHz-2596MHz, 2592MHz-2594MHz, 2604MHz-2606MHz, 2660MHz-2662MHz, 2593MHz-2595MHz and 2593MHz-2595 MHz.

As shown in fig. 4, the bandwidth of the first filtering branch 12 is located in a range from 2512.5MHz to 2678MHz, and as shown by a frequency band curve S1 in fig. 4, the coupling zeros of the first filtering branch 12 include a, b, c, and d, and the coupling zeros enable the bandwidth rejection at the frequency point of 2500MHz to be greater than 53dB, the bandwidth rejection at the frequency point of 2400MHz to be greater than 75dB, and the bandwidth rejection at the frequency point of 2700MHz to be greater than 55dB, so that the performance of the first filtering branch 12, such as out-of-band rejection, can be improved.

It should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameter are shown as the same coupling zero; and the above simulation structure and parameters of the second filtering branch 13 are similar to those of the first filtering branch 12, which are not described herein again.

In another implementation, as shown in fig. 5 to 13, fig. 5 is a schematic structural diagram of another embodiment of the filter of the present application; FIG. 6 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 7 is a diagram illustrating simulation results of a first filtering branch in an embodiment of the filter of the present application; FIG. 8 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application; FIG. 9 is a diagram illustrating simulation results of a third filtering branch in an embodiment of the filter of the present application; FIG. 10 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application; FIG. 11 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application; FIG. 12 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application; fig. 13 is a diagram illustrating simulation results of a sixth filtering branch in an embodiment of the filter of the present application. As shown in fig. 5, the cavity array structure of the first filtering branch 12 of this embodiment is the same as the cavity array structure of the first filtering branch 12 of the above embodiment, but the topology and the rf parameters are slightly different.

Specifically, as shown in fig. 6, an inductive cross coupling is formed between the third filter cavity A3 and the sixth filter cavity a6 of the first filter branch 12, and a capacitive cross coupling is formed between the eighth filter cavity A8 and the tenth filter cavity a10 of the first filter branch 12.

As shown in fig. 5, in the first filtering branch 12 of the present embodiment, the coupling bandwidth between the first port and the first filtering cavity a1 is in the range of 27MHz-34 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 ranges from 22MHz to 28 MHz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 ranges from 15MHz to 21 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 ranges from 13MHz to 18 MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity a6 is in the range of (-8) MHz- (-3) MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 18MHz to 24 MHz; the coupling bandwidth between the fourth filter cavity a4 and the sixth filter cavity a6 ranges from (-2) MHz to 2 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 18MHz to 18 MHz; the coupling bandwidth between the sixth filtering cavity A6 and the seventh filtering cavity A7 ranges from 13MHz to 19 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 12MHz to 18 MHz; the coupling bandwidth between the seventh filter cavity a7 and the tenth filter cavity a10 is in the range of (-9) MHz- (-4) MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 34MHz to 42 MHz; the coupling bandwidth between the eighth filter cavity A8 and the tenth filter cavity a10 ranges from (-2) MHz to 2 MHz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 21MHz to 27 MHz; the coupling bandwidth between the tenth filter cavity a10 and the second port is in the range of 27MHz-34MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity a1 to the tenth filtering cavity a10 of the first filter branch 12 are sequentially in the following ranges: 1899MHz-1901MHz, 2592MHz-2594MHz, and 2592MHz-2594 MHz.

As shown in fig. 7, the bandwidth of the first filtering branch 12 is in the range of 1883MHz to 1917MHz, and as shown by a frequency band curve S1 in fig. 7, the coupling zeros of the first filtering branch 12 include a, b, c, d, which cause the bandwidth suppression for the frequency band from 1MHz to 470MHz to be greater than or equal to 62dB, the bandwidth suppression for the frequency band from 698MHz to 1710MHz to 72dB, the bandwidth suppression for the frequency band from 1710MHz to 1778.9MHz to be greater than or equal to 92dB, the bandwidth suppression for the frequency band from 1778.9MHz to 1785.9MHz to be greater than or equal to 98dB, the bandwidth suppression for the frequency band from 1785.9MHz to 1850.9MHz to 58dB, the bandwidth suppression for the frequency band from 1785.9MHz to 1880.9MHz to 36.5dB, the bandwidth suppression for the frequency band from 1919.1MHz to 1929.2MHz to be greater than or equal to 46.5dB, the bandwidth suppression for the frequency band from 1291.9MHz to 1391.5MHz to be greater than or equal to 48dB, the bandwidth suppression of a band of 1391.5MHz to 1950.8MHz is greater than or equal to 56dB, the bandwidth suppression of a band of 1950.8MHz to 1980.8MHz is greater than or equal to 52dB, the bandwidth suppression of a band of 1980.8MHz to 1990.8MHz is greater than or equal to 27dB, the bandwidth suppression of a band of 1990.8MHz to 2000.8MHz is greater than or equal to 15.5dB, the bandwidth suppression of a band of 2034.2MHz to 2044.2MHz is greater than or equal to 12dB, the bandwidth suppression of a band of 2044.2MHz to 2119.2MHz is greater than or equal to 27dB, the bandwidth suppression of a band of 2119.2MHz to 2169.2MHz is greater than or equal to 67dB, the bandwidth suppression of a band of 2170MHz to 2300MHz is greater than or equal to 58dB, the bandwidth suppression of a band of 2300MHz to 2400MHz to 72dB, the bandwidth suppression of 2400MHz to 2496MHz is greater than or equal to 77dB, the bandwidth suppression of 2496MHz to 2696MHz is greater than or equal to 100dB, the out-of-band rejection etc. of the first filtering branch 12 can be improved.

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

As shown in fig. 5, the cavity arrangement structure, the zero point distribution, and the radio frequency parameters of the second filtering branch 13 in this embodiment are the same as those of the second filtering branch 13 in the above embodiment, and are not repeated here.

Optionally, as shown in fig. 5, the filter 10 further includes: the third filtering branch 14 is arranged on the housing 11, the third filtering branch 14 is composed of five filtering cavities C1-C5 coupled in sequence along a third coupling path, and the five filtering cavities C1-C5 of the third filtering branch 14 are adjacently arranged in a line in sequence along the second direction y; the filter cavities are arranged in a row and are adjacently arranged, so that the arrangement space of the filter cavities can be reduced, and the size of the filter 10 can be reduced.

As shown in fig. 5, the five filter cavities C1-C5 of the third filter branch 14 include: a first filter chamber C1, a second filter chamber C2, a third filter chamber C3, a fourth filter chamber C4 and a fifth filter chamber C5.

Alternatively, as shown in fig. 5, a first port (not shown) is connected to the first filter cavity a1 of the first filter branch 12 and the first filter cavity C1 of the third filter branch 14, respectively, and a second port is connected to the tenth filter cavity a10 of the first filter branch 12 and the fifth filter cavity C5 of the third filter branch 14, respectively. The ports are used for filtering signal transmission, and the first filtering branch 12 and the third filtering branch 14 share the ports, so that the number of taps can be reduced, the complexity of the filter 10 is reduced, and the cost is saved.

As shown in fig. 5, two adjacent filter cavities in the third filter branch 14 are arranged in an intersecting manner, and by the intersecting arrangement of the filter cavities, a partition wall needs to be arranged between the two coupled filter cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing process can be simplified.

The topology of the third filtering branch 14 is shown in fig. 8.

As shown in fig. 8, in the third filtering branch 14 of the present embodiment, the coupling bandwidth between the first port and the first filtering cavity C1 is in the range of 15MHz-21 MHz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 12MHz to 18 MHz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 ranges from 8MHz to 14 MHz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 ranges from 8MHz to 14 MHz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 12MHz to 18 MHz; the coupling bandwidth between the fifth filter cavity C10 and the second port ranges from 15MHz to 21MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity C1 to the fifth filtering cavity C5 of the third filtering branch 14 are sequentially in the following ranges: 2017MHz-2019MHz, 2017MHz-2019MHz and 2017MHz-2019 MHz.

Therefore, the resonant frequency of each filter cavity is 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. 9, the bandwidth of the third filtering branch 14 is in the range of 2008MHz-2028MHz, as shown by the frequency band curve S1 in fig. 9, the bandwidth rejection of the third filtering branch 14 for the frequency band 1MHz-470MHz is greater than or equal to 62dB, the bandwidth rejection of the frequency band 698MHz-1710MHz is greater than or equal to 72dB, the bandwidth rejection of the frequency band 1710MHz-1778.9MHz is greater than or equal to 92dB, the bandwidth rejection of the frequency band 1778.9MHz-1785.9MHz is greater than or equal to 98dB, the bandwidth rejection of the frequency band 1785.9MHz-1850.9MHz is greater than or equal to 58dB, the bandwidth rejection of the frequency band 1785.9MHz-1880.9MHz is greater than or equal to 36.5dB, the bandwidth rejection of the frequency band 1919.1MHz-1929.2MHz is greater than or equal to 46.5dB, the bandwidth rejection of the frequency band 1291.9MHz-1391.5MHz is greater than or equal to 48dB, the bandwidth suppression of a band of 1391.5MHz to 1950.8MHz is greater than or equal to 56dB, the bandwidth suppression of a band of 1950.8MHz to 1980.8MHz is greater than or equal to 52dB, the bandwidth suppression of a band of 1980.8MHz to 1990.8MHz is greater than or equal to 27dB, the bandwidth suppression of a band of 1990.8MHz to 2000.8MHz is greater than or equal to 15.5dB, the bandwidth suppression of a band of 2034.2MHz to 2044.2MHz is greater than or equal to 12dB, the bandwidth suppression of a band of 2044.2MHz to 2119.2MHz is greater than or equal to 27dB, the bandwidth suppression of a band of 2119.2MHz to 2169.2MHz is greater than or equal to 67dB, the bandwidth suppression of a band of 2170MHz to 2300MHz is greater than or equal to 58dB, the bandwidth suppression of a band of 2300MHz to 2400MHz to 72dB, the bandwidth suppression of 2400MHz to 2496MHz is greater than or equal to 77dB, the bandwidth suppression of 2496MHz to 2696MHz is greater than or equal to 100dB, the out-of-band rejection etc. of the third filtering branch 14 can be improved.

Optionally, as shown in fig. 5, the filter 10 further includes: and a fourth filtering branch 15 disposed on the housing 11, wherein the fourth filtering branch 15 is composed of ten filtering cavities D1-D10 coupled in sequence along a fourth coupling path, and forms four coupling zeros of the fourth filtering branch 15.

The coupling zero of the fourth filtering branch 15 can improve the out-of-band rejection and other characteristics of the filtering signal of the fourth filtering branch 15.

As shown in fig. 5, the ten filter cavities D1-D10 of the fourth filter branch 15 include: the filter comprises a first filter cavity D1, a second filter cavity D2, a third filter cavity D3, a fourth filter cavity D4, a fifth filter cavity D5, a sixth filter cavity D6, a seventh filter cavity D7, an eighth filter cavity D8, a ninth filter cavity D9 and a tenth filter cavity D10.

As shown in fig. 5, the first filter cavity D1 of the fourth filter branch 15 to the tenth filter cavity D10 of the fourth filter branch 15 are divided into two columns arranged along the first direction x, the first filter cavity D1, the second filter cavity D2, the fourth filter cavity D4 and the fifth filter cavity D5 of the fourth filter branch 15, the eighth filtering cavity D8 and the ninth filtering cavity D9 are in a row and are sequentially and adjacently arranged along the second direction y, the third filtering cavity D3, the sixth filtering cavity D6, the seventh filtering cavity D7 and the tenth filtering cavity D10 of the fourth filtering branch 15 are in a row and are sequentially and adjacently arranged along the second direction y, the third filtering cavity D3 of the fourth filtering branch 15 is further respectively and adjacently disposed to the second filtering cavity D2 of the fourth filtering branch 15 and the fourth filtering cavity D4 of the fourth filtering branch 15, and the seventh filtering cavity D7 of the fourth filtering branch 15 is further and adjacently disposed to the fifth filtering cavity D5 of the fourth filtering branch 15 and the eighth filtering cavity D8 of the fourth filtering branch 15.

As can be seen from the above analysis, the ten filter cavities D1-D10 of the fourth filter branch 15 are regularly arranged in two rows, and the two rows of filter cavities are adjacent to each other, and a plurality of filter cavities in each row are adjacent to each other in sequence, and the two rows of filter cavities are staggered to reduce the arrangement space of the fourth filter branch 15.

Further, as shown in fig. 5, the nine filter cavities D1-D9 of the fourth filter branch 15 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the row cavities of the nine filter cavities D1-D9 can be more compact, and the arrangement space of the nine filter cavities D1-D9 can be reduced.

And the ninth filtering cavity D9 of the fourth filtering branch 15 is respectively intersected with the eighth filtering cavity D8 and the tenth filtering cavity D10, and through the intersection between the filtering cavities, a partition wall needs to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing technology can be simplified.

As shown in fig. 5, the capacitive cross-coupling is respectively performed between the third filter cavity D3 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, between the fourth filter cavity D4 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, between the seventh filter cavity D7 of the fourth filter branch 15 and the tenth filter cavity D10 of the fourth filter branch 15, and between the eighth filter cavity D8 of the fourth filter branch 15 and the tenth filter cavity D10 of the fourth filter branch 15, so as to form four capacitive coupling zeros of the fourth filter branch 15.

The coupling zero points of the fourth filtering branch 15 are all capacitive coupling zero points, so that the consistency of materials can be improved, and the stability of the filter 10 is improved.

A flying bar (equivalent to the capacitor C8 shown in fig. 10) may be disposed between the third filter cavity D3 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, a flying bar (equivalent to the capacitor C9 shown in fig. 10) may be disposed between the fourth filter cavity D4 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, a flying bar (equivalent to the capacitor C10 shown in fig. 10) may be disposed between the seventh filter cavity D7 of the fourth filter branch 15 and the tenth filter cavity D10 of the fourth filter branch 15, and a flying bar (equivalent to the capacitor C10 shown in fig. 10) may be disposed between the eighth filter cavity D8 of the fourth filter branch 15 and the tenth filter cavity D10 of the fourth filter branch 15 (equivalent to the capacitor C11 shown in fig. 10). From the above analysis, it can be known that the distance between the third filter cavity D3 and the sixth filter cavity D6, the distance between the fourth filter cavity D4 and the sixth filter cavity D6, the distance between the seventh filter cavity D7 and the tenth filter cavity D10, and the distance between the eighth filter cavity D8 and the tenth filter cavity D10 are equal, so that the flying bar elements with the same specification can be adopted, and the effect of realizing the four capacitive coupling zeros of the fourth filter branch 15 can be achieved. When the fourth filtering branch 15 is formed, the types of materials can be reduced, the consistency of the materials is improved, the manufacturing is facilitated, the complexity of the product is reduced, the cost is saved, and the stability of the filter 10 is improved.

The simulation result of the fourth filtering branch 15 and the radio frequency parameters in this embodiment are the same as the first filtering branch 12 in this embodiment, and are not described herein again.

Optionally, as shown in fig. 5, the filter 10 further includes: the fifth filtering branch 16 is arranged on the housing 11, the fifth filtering branch 16 is composed of five filtering cavities E1-E5 coupled in sequence along a fifth coupling path, second filtering cavities E2 to E5 of the fifth filtering branch 16 are arranged adjacently in sequence along a second direction y to form a row, the first filtering cavity E1 of the fifth filtering branch 16 is arranged adjacently to the second filtering cavity E2 of the fifth filtering branch 16, and the second filtering cavity E2 of the fifth filtering branch 16 is close to the fourth filtering branch 15; the filter cavities are arranged in a row and are adjacently arranged, so that the arrangement space of the filter cavities can be reduced, and the size of the filter 10 can be reduced.

As shown in fig. 5, the five filter cavities E1-E5 of the fifth filter branch 16 include: a first filter cavity E1, a second filter cavity E2, a third filter cavity E3, a fourth filter cavity E4 and a fifth filter cavity E5.

As shown in fig. 5, two adjacent filter cavities in the four filter cavities E2-E5 are arranged in an intersecting manner, and the intersecting arrangement of the filter cavities can avoid the need of arranging a partition wall between the two coupled filter cavities in the conventional filter, and then a coupling window is arranged on the partition wall, so that the material can be reduced, and the processing technology can be simplified.

Optionally, as shown in fig. 5, a third port (not shown) and a fourth port (not shown) are further provided on the housing 11, the third port is respectively connected to the first filter cavity D1 of the fourth filter branch 15 and the first filter cavity E1 of the fifth filter branch 16, and the fourth port is respectively connected to the tenth filter cavity D10 of the fourth filter branch 15 and the fifth filter cavity E5 of the fifth filter branch 16. The ports are used for filtering signal transmission, and the fourth filtering branch 15 and the fifth filtering branch 16 share the ports, so that the number of taps can be reduced, the complexity of the filter 10 is reduced, and the cost is saved.

Wherein, the topology of the fifth filtering branch 16 is as shown in fig. 11; the simulation result and the above radio frequency parameters of the fifth filtering branch 16 in this embodiment are the same as those of the third filtering branch 14 in this embodiment, and are not described herein again.

Optionally, as shown in fig. 5, the filter 10 further includes: the sixth filtering branch 17 is arranged on the shell 11, the sixth filtering branch 17 is composed of ten filtering cavities F1-F10 which are coupled in sequence, and four coupling zeros of the sixth filtering branch 17 are formed; the coupling zero of the sixth filtering branch 17 can improve the out-of-band rejection and other characteristics of the filtered signal of the sixth filtering branch 17.

As shown in fig. 5, the ten filter cavities F1-F10 of the sixth filter branch 17 include: a first filter cavity F1, a second filter cavity F2, a third filter cavity F3, a fourth filter cavity F4, a fifth filter cavity F5, a sixth filter cavity F6, a seventh filter cavity F7, an eighth filter cavity F8, a ninth filter cavity F9 and a tenth filter cavity F10.

As shown in fig. 5, the first filter cavity F1 of the sixth filter branch 17 to the fourth filter cavity F4 of the sixth filter branch 17 are divided into two columns arranged along the first direction x, the first filter cavity F1 and the fourth filter cavity F4 of the sixth filter branch 17 are one column and are sequentially and adjacently arranged along the second direction y, the second filter cavity F2 and the third filter cavity F3 of the sixth filter branch 17 are one column and are sequentially and adjacently arranged along the second direction y, and the first filter cavity F1 of the sixth filter branch 17 is further respectively and adjacently disposed to the second filter cavity F2 of the sixth filter branch 17 and the third filter cavity F3 of the sixth filter branch 17; the fifth filtering cavity F5 of the sixth filtering branch 17 to the tenth filtering cavity F10 of the sixth filtering branch 17 are divided into two rows arranged along the first direction x, the fifth filtering cavity F5, the eighth filtering cavity F8, the ninth filtering cavity F9 and the tenth filtering cavity F10 of the sixth filtering branch 17 are one row and sequentially arranged adjacently along the second direction y, the sixth filtering cavity F6 and the seventh filtering cavity F7 of the sixth filtering branch 17 are one row and sequentially arranged adjacently along the second direction y, and the seventh filtering cavity F7 of the sixth filtering branch 17 is further respectively arranged adjacently to the fifth filtering cavity F5 of the sixth filtering branch 17 and the eighth filtering cavity F8 of the sixth filtering branch 17; the third filter cavity F3 of the sixth filter branch 17 is further disposed adjacent to the sixth filter cavity F6 of the sixth filter branch 17, the fourth filter cavity F4 of the sixth filter branch 17 is further disposed adjacent to the fifth filter cavity F5 of the sixth filter branch 17, and a projection of a center of the third filter cavity F3 of the sixth filter branch 17 in the first direction x is located between a projection of a center of the fifth filter cavity F5 of the sixth filter branch 17 in the first direction x and a projection of a center of the sixth filter cavity F6 of the sixth filter branch 17 in the first direction x, and a projection of a center of the sixth filter cavity F6 of the sixth filter branch 17 in the second direction y is located between a projection of a center of the third filter cavity F3 of the sixth filter branch 17 in the second filter direction y and a projection of a center of the fifth filter cavity F5 of the sixth filter branch 17 in the second direction y.

As shown in fig. 5, the fifth filtering cavity F5 to the tenth filtering cavity F10 of the sixth filtering branch 17 are regularly arranged in a row and are adjacently staggered, so that the arrangement space of the sixth filtering branch 17 can be reduced; the first filtering cavity F1 to the fourth filtering cavity F4 are arranged in a prismatic shape, so that the arrangement space of the sixth filtering branch 17 in the second direction y can be reduced.

As shown in fig. 5, the second filtering cavity F2 of the sixth filtering branch 17 is also respectively intersected with the first filtering cavity F1 and the third filtering cavity F3, and through the intersection between the filtering cavities, a partition wall needs to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that the material consumption can be reduced, and the processing process can be simplified.

As shown in fig. 5, the first filter cavity F1 of the sixth filter branch 17 and the third filter cavity F3 of the sixth filter branch 17 are capacitively cross-coupled to form a capacitively coupled zero of the sixth filter branch 17, the first filter cavity F1 of the sixth filter branch 17 and the fourth filter cavity F4 of the sixth filter branch 17, the fifth filter cavity F5 of the sixth filter branch 17 and the seventh filter cavity F7 of the sixth filter branch 17, and the fifth filter cavity F5 of the sixth filter branch 17 and the eighth filter cavity F8 of the sixth filter branch 17 are capacitively cross-coupled to form three capacitively coupled zeros of the sixth filter branch 17.

As shown in fig. 12, a flying bar (equivalent to the capacitor C12 shown in fig. 12) is provided between the first filter cavity F1 of the sixth filter branch 17 and the third filter cavity F3 of the sixth filter branch 17.

As shown in fig. 12, a window and a metal coupling rib (equivalent to the capacitor L6 shown in fig. 12) are disposed between the first filter cavity F1 of the sixth filter branch 17 and the fourth filter cavity F4 of the sixth filter branch 17, a window and a metal coupling rib (equivalent to the capacitor L7 shown in fig. 12) are disposed between the fifth filter cavity F5 of the sixth filter branch 17 and the seventh filter cavity F7 of the sixth filter branch 17, and a window and a metal coupling rib (equivalent to the capacitor L8 shown in fig. 12) are disposed between the fifth filter cavity F5 of the sixth filter branch 17 and the eighth filter cavity F8 of the sixth filter branch 17. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subjected to a small change of the external temperature, so as to reduce the temperature drift of the filter 10.

As shown in fig. 5, the housing 11 is further provided with a seventh port (not shown) and an eighth port (not shown), the seventh port is respectively connected to the first filter cavity F1 of the sixth filter branch 17, and the eighth port is respectively connected to the tenth filter cavity F10 of the sixth filter branch 17.

As shown in fig. 5, in the sixth filtering branch 17, the coupling bandwidth between the seventh port and the first filtering cavity F1 in this embodiment is in the range of 127MHz-145 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 ranges from 55MHz to 66 MHz; the coupling bandwidth between the first filter cavity F1 and the third filter cavity F3 is in the range of (-103) MHz- (-89) MHz; the coupling bandwidth between the first filter cavity F1 and the fourth filter cavity F4 ranges from 33MHz to 41 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 ranges from 22MHz to 29 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 ranges from 73MHz to 86 MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 75MHz to 88 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 39MHz to 48 MHz; the coupling bandwidth between the fifth filter cavity F5 and the seventh filter cavity F7 ranges from 58MHz to 69 MHz; the coupling bandwidth between the fifth filter cavity F5 and the eighth filter cavity F8 ranges from 19MHz to 26 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 29MHz to 36 MHz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 ranges from 73MHz to 85 MHz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 ranges from 81MHz to 94 MHz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 ranges from 111MHz to 127 MHz; the coupling bandwidth between the tenth filter cavity F10 and the eighth port ranges from 127MHz to 145MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity F1 to the tenth filtering cavity F10 of the sixth filtering branch 17 are sequentially in the following ranges: 2593MHz-2595MHz, 2520MHz-2522MHz, 2572MHz-2575MHz, 2597MHz-2599MHz, 2594MHz-2596MHz, 2662MHz-2664MHz, 2612MHz-2615MHz, 2593MHz-2595MHz and 2593MHz-2595 MHz.

As shown in fig. 13, the bandwidth of the sixth filtering branch 17 is in the range of 2513.2MHz-2674.7MHz, and as shown by the band curve S1 in fig. 13, the coupling zeros of the sixth filtering branch 17 include a, b, c, d, which make the bandwidth rejection of the band 0.9MHz-1915MHz greater than or equal to 102dB, the bandwidth rejection of the band 1915MHz-230MHz greater than or equal to 82dB, the bandwidth rejection of the band 2300MHz-2400.6MHz greater than or equal to 76dB, the bandwidth rejection of the band 2400.6MHz-2455.6MHz greater than or equal to 57dB, the bandwidth rejection of the band 2455.6MHz-2500.6MHz greater than or equal to 55dB, the bandwidth rejection of the band 2699.4MHz-2900MHz greater than or equal to 57dB, the bandwidth rejection of the band 2900MHz-3400MHz greater than or equal to 67dB, the bandwidth rejection of the band 3400 MHz-3400MHz greater than or equal to 77dB, the bandwidth rejection of the frequency band from 3800MHz to 4900MHz is greater than or equal to 67dB, the bandwidth rejection of the frequency band from 5120MHz to 5350MHz is greater than or equal to 62dB, the bandwidth rejection of the frequency band from 5350MHz to 5725MHz is greater than or equal to 42dB, the bandwidth rejection of the frequency band from 5725MHz to 5850MHz is greater than or equal to 62dB, and the bandwidth rejection of the frequency band from 5850MHz to 12.75GHz is greater than or equal to 22dB, so that the out-of-band rejection performance and other performances of the sixth filtering branch 17 can be improved.

Optionally, the first filtering branch 12, the third filtering branch 14 and the fourth filtering branch 15 are arranged at intervals along the first direction x; the third filtering branch 14 and the fifth filtering branch 16 are arranged along the first direction x, and the third filtering branch 14 and the fifth filtering branch 16 are located between the first filtering branch 12 and the fourth filtering branch 15; the third filtering branch 14 is located between the second filtering branch 13 and the first filtering branch 12, and the third filtering branch 14 is adjacent to the second filtering branch 13; the second filtering branch 13 is located between the third filtering branch 14 and the sixth filtering branch 17, and the sixth filtering branch 17 is adjacent to the second filtering branch 13; the tenth filter cavity B10 of the second filter branch 13, the tenth filter cavity C10 of the third filter branch 14, and the tenth filter cavity F10 of the sixth filter branch 17 are arranged in the same column along the first direction x, and the second filter cavity B2 of the second filter branch 13 and the second filter cavity F2 of the sixth filter branch 17 are arranged in the same column along the first direction x.

The first filtering branch 12, the second filtering branch 13, the fourth filtering branch 15 and the sixth filtering branch 17 are transmitting filtering branches, and the third filtering branch 14 and the fifth filtering branch 16 are receiving filtering branches.

The first port and the third port are input ports, the second port and the fourth port are output ports, and the ports can be taps.

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

The present application further provides a communication device, as shown in fig. 14, fig. 14 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device of the present embodiment includes an antenna 32 and a radio frequency unit 31 connected to the antenna 32, the radio frequency unit 31 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering a radio frequency signal.

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

Different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a first coupling path, and four coupling zeros of the first filtering branch are formed; the distance between the center of the nth filter of the first filtering branch and the center of the (n +1) th filter is the sum of the radius of the nth filter of the first filtering branch and the radius of the (n +1) th filter, and n is greater than zero and less than or equal to 9. Through this way, the distance between two filter cavities of the first filter branch of the filter cascaded along the first coupling path in the embodiment of the present application is equal to the sum of the radii of the two filter cavities, that is, the two filter cavities cascaded along the first coupling path are adjacently arranged, so that the filter cavities of the first filter branch can be arranged more compactly, the arrangement space of the first filter branch can be reduced, the size of the filter can be reduced, and the cost is saved.

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

Claims

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 ten filtering cavities which are sequentially coupled along a first coupling path, and four coupling zeros of the first filtering branch are formed;

the distance between the center of the nth filter and the center of the (n +1) th filter of the first filtering branch is the sum of the radius of the nth filter and the radius of the (n +1) th filter of the first filtering branch, and n is greater than zero and less than or equal to 9.

2. The filter according to claim 1, wherein the first filter cavity of the first filter branch to the tenth filter cavity of the first filter branch are divided into two columns arranged along the first direction;

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

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

the fourth filter cavity of the first filter branch is also respectively adjacent to the third filter cavity of the first filter branch and the sixth filter cavity of the first filter branch, and the eighth filter cavity of the first filter branch is also adjacent to the seventh filter cavity of the first filter branch and the tenth filter cavity of the first filter branch;

capacitive cross coupling is respectively performed between the fourth filter cavity of the first filter branch and the sixth filter cavity of the first filter branch, between the seventh filter cavity of the first filter branch and the tenth filter cavity of the first filter branch, and between the eighth filter cavity of the first filter branch and the tenth filter cavity of the first filter branch, so as to form three capacitive coupling zeros of the first filter branch, and inductive cross coupling is performed between the third filter cavity of the first filter branch and the sixth filter cavity of the first filter branch, so as to form one inductive coupling zero of the first filter branch.

3. The filter of claim 2, further comprising: the second filtering branch is arranged on the shell and is arranged at intervals with the first filtering branch, and the second filtering branch consists of ten filtering cavities which are sequentially coupled along a second coupling path and forms four coupling zeros of the second filtering branch;

a fourth filtering cavity of the second filtering branch to a tenth filtering cavity of the second filtering branch are divided into two rows arranged along the first direction;

the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the second filtering branch are in a row and are sequentially and adjacently arranged along the second direction, and the seventh filtering cavity and the eighth filtering cavity of the second filtering branch are in a row and are sequentially and adjacently arranged along the second direction;

the seventh filter cavity of the second filter branch is also arranged adjacent to the sixth filter cavity of the second filter branch and the ninth filter cavity of the second filter branch;

the fourth filter cavity of the second filter branch circuit is also respectively arranged adjacent to the first filter cavity of the second filter branch circuit and the third filter cavity of the second filter branch circuit, the second filter cavity of the second filter branch circuit is also respectively arranged adjacent to the first filter cavity of the second filter branch circuit and the third filter cavity of the second filter branch circuit, and the projection of the center of the fourth filter cavity of the second filter branch in the first direction is located between the projection of the center of the first filter cavity of the second filter branch in the first direction and the projection of the center of the second filter cavity of the second filter branch in the first direction, the projection of the center of the first filter cavity of the second filter branch in the second direction is located between the projection of the center of the fourth filter cavity of the second filter branch in the second direction and the projection of the center of the second filter cavity of the second filter branch in the second direction;

the first filter cavity of the second filter branch is capacitively cross-coupled with the third filter cavity of the second filter branch to form a capacitive coupling zero point of the second filter branch, and the first filter cavity of the second filter branch is inductively cross-coupled with the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch is inductively cross-coupled with the ninth filter cavity of the second filter branch, and the seventh filter cavity of the second filter branch is inductively cross-coupled with the ninth filter cavity of the second filter branch to form three inductive coupling zero points of the second filter branch.

4. The filter of claim 3, further comprising: and the third filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a third coupling path, and the five filtering cavities of the third filtering branch are sequentially and adjacently arranged in a line along the second direction.

5. The filter according to claim 4, wherein a first port and a second port are further disposed on the housing, the first port is respectively connected to the first filter cavity of the first filter branch and the first filter cavity of the third filter branch, and the second port is respectively connected to the tenth filter cavity of the first filter branch and the fifth filter cavity of the third filter branch.

6. The filter of claim 4, further comprising:

the fourth filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a fourth coupling path, and four coupling zeros of the fourth filtering branch are formed;

the first filtering cavity of the fourth filtering branch to the tenth filtering cavity of the fourth filtering branch are divided into two rows arranged along the first direction, the first filtering cavity, the second filtering cavity, the fourth filtering cavity, the fifth filtering cavity, the eighth filtering cavity and the ninth filtering cavity of the fourth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the third filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the tenth filtering cavity of the fourth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the third filter cavity of the fourth filter branch is also respectively arranged adjacent to the second filter cavity of the fourth filter branch and the fourth filter cavity of the fourth filter branch, the seventh filter cavity of the fourth filter branch is also arranged adjacent to the fifth filter cavity of the fourth filter branch and the eighth filter cavity of the fourth filter branch;

capacitive cross coupling is respectively performed between a third filter cavity of the fourth filter branch and a sixth filter cavity of the fourth filter branch, between a fourth filter cavity of the fourth filter branch and the sixth filter cavity of the fourth filter branch, between a seventh filter cavity of the fourth filter branch and a tenth filter cavity of the fourth filter branch, and between an eighth filter cavity of the fourth filter branch and the tenth filter cavity of the fourth filter branch, so that four capacitive coupling zeros of the fourth filter branch are formed;

the fifth filtering branch is arranged on the shell, the fifth filtering branch is composed of five filtering cavities which are sequentially coupled along a fifth coupling path, a second filtering cavity to a fifth filtering cavity of the fifth filtering branch are sequentially and adjacently arranged in a line along the second direction, and the first filtering cavity of the fifth filtering branch is close to the second filtering cavity of the fifth filtering branch and is opposite to the second filtering cavity of the fifth filtering branch.

7. The filter according to claim 6, wherein a third port and a fourth port are further disposed on the housing, the third port is respectively connected to the first filter cavity of the fourth filter branch and the first filter cavity of the fifth filter branch, and the fourth port is respectively connected to the tenth filter cavity of the fourth filter branch and the fifth filter cavity of the fifth filter branch.

8. The filter of claim 6, further comprising: the sixth filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled, and four coupling zeros of the sixth filtering branch are formed;

the first filter cavity of the sixth filter branch to the fourth filter cavity of the sixth filter branch are divided into two rows arranged along the first direction, the first filter cavity and the fourth filter cavity of the sixth filter branch are in one row and are sequentially and adjacently arranged along the second direction, the second filter cavity and the third filter cavity of the sixth filter branch are in one row and are sequentially and adjacently arranged along the second direction, and the first filter cavity of the sixth filter branch is respectively and adjacently arranged with the second filter cavity of the sixth filter branch and the third filter cavity of the sixth filter branch;

the fifth filtering cavity of the sixth filtering branch to the tenth filtering cavity of the sixth filtering branch are divided into two rows arranged along the first direction, the fifth filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the sixth filtering branch are arranged in a row and are sequentially and adjacently arranged along the second direction, the sixth filtering cavity and the seventh filtering cavity of the sixth filtering branch are arranged in a row and are sequentially and adjacently arranged along the second direction, and the seventh filtering cavity of the sixth filtering branch is also respectively and adjacently arranged with the fifth filtering cavity of the sixth filtering branch and the eighth filtering cavity of the sixth filtering branch;

the third filter cavity of the sixth filter branch is further arranged adjacent to the sixth filter cavity of the sixth filter branch, the fourth filter cavity of the sixth filter branch is further arranged adjacent to the fifth filter cavity of the sixth filter branch, and the projection of the center of the third filter cavity of the sixth filter branch in the first direction is located between the projection of the center of the fifth filter cavity of the sixth filter branch in the first direction and the projection of the center of the sixth filter cavity of the sixth filter branch in the first direction, and the projection of the center of the sixth filter cavity of the sixth filter branch in the second direction is located between the projection of the center of the third filter cavity of the sixth filter branch in the second direction and the projection of the center of the fifth filter cavity of the sixth filter branch in the second direction;

the first filter cavity of the sixth filter branch is capacitively cross-coupled with the third filter cavity of the sixth filter branch to form a capacitive coupling zero of the sixth filter branch, and the first filter cavity of the sixth filter branch is capacitively cross-coupled with the fourth filter cavity of the sixth filter branch, the fifth filter cavity of the sixth filter branch is capacitively cross-coupled with the seventh filter cavity of the sixth filter branch, and the fifth filter cavity of the sixth filter branch is capacitively cross-coupled with the eighth filter cavity of the sixth filter branch to form three capacitive coupling zeros of the sixth filter branch.

9. The filter according to claim 8, wherein the first filtering branch, the third filtering branch and the fourth filtering branch are disposed at intervals along the first direction;

the third filtering branch and the fifth filtering branch are arranged along the first direction, and the third filtering branch and the fifth filtering branch are located between the first filtering branch and the fourth filtering branch;

the third filtering branch is positioned between the second filtering branch and the first filtering branch, and the third filtering branch is arranged adjacent to the second filtering branch;

the second filtering branch is located between the third filtering branch and the sixth filtering branch, and the sixth filtering branch is adjacent to the second filtering branch;

the tenth filter cavity of the second filter branch, the tenth filter cavity of the third filter branch and the tenth filter cavity of the sixth filter branch are arranged in the same row along the first direction, and the second filter cavity of the second filter branch and the second filter cavity of the sixth filter branch are arranged in the same row 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 a radio frequency signal.