CN211125983U - Filter and communication equipment - Google Patents

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a first coupling path, and an inductive coupling zero point of the first filtering branch is formed; the second filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three inductive coupling zeros of the second filtering branch are formed; the first filtering branch and the second filtering branch are arranged along the second direction, five filtering cavities of the first filtering branch are divided into two rows arranged along the first direction, and ten filtering cavities of the second filtering branch are divided into two rows arranged along the first direction. By the mode, the size of the filter can be reduced, the whole filter is relatively square, and the design requirement of miniaturization is met.

Description

Filter and communication equipment

Technical Field

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

Background

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

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

SUMMERY OF THE UTILITY MODEL

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

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The first filtering branch consists of five filtering cavities which are sequentially coupled along a first coupling path, and an inductive coupling zero point of the first filtering branch is formed; the second filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three inductive coupling zeros of the second filtering branch are formed; the first filtering branch and the second filtering branch are arranged along the second direction, five filtering cavities of the first filtering branch are divided into two rows arranged along the first direction, and ten filtering cavities of the second filtering branch are divided into two rows arranged along the first direction.

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 five filtering cavities which are sequentially coupled along a first coupling path, and an inductive coupling zero point of the first filtering branch is formed; the second filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three inductive coupling zeros of the second filtering branch are formed; the first filtering branch and the second filtering branch are arranged along the second direction, five filtering cavities of the first filtering branch are divided into two rows arranged along the first direction, and ten filtering cavities of the second filtering branch are divided into two rows arranged along the first direction. In this way, the first filtering branch and the second filtering branch of the filter of the embodiment of the present application are arranged along the second direction of the casing, and the filtering cavities in each filtering branch are all arranged in a row along the first direction of the casing, so that the cavity arrangement is regular and reasonable, the length in a certain direction of the filter is avoided being too long, the size of the filter is reduced, the whole filter is square and regular, and the design requirement of miniaturization is met.

Drawings

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

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

FIG. 2 is a schematic diagram of an embodiment of a filter according to the present application;

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

FIG. 4 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application;

FIG. 5 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application;

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

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

fig. 8 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 provides a cavity filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes: the filter comprises a shell 11, a first filtering branch 12 and a second filtering branch 14, wherein the shell 11 has a first direction x and a second direction y which are perpendicular to each other; the first filtering branch 12 is arranged on the housing 11, the first filtering branch 12 is composed of five filtering cavities a1-a5 coupled in sequence along a first coupling path, and the five filtering cavities a1-a5 further form a coupling zero point of the first filtering branch 12; the second filtering branch 14 is composed of ten filtering cavities C1-C10 coupled in sequence along a second coupling path, and the ten filtering cavities C1-C10 further form three coupling zeros of the second filtering branch 14; the first filtering branch 12 and the second filtering branch 14 are arranged along the second direction y, and five filtering cavities a1-a5 of the first filtering branch 12 are divided into two rows arranged along the first direction x, and ten filtering cavities C1-C10 of the second filtering branch 14 are divided into two rows arranged along the first direction x.

As shown in fig. 1, the five filter cavities a1-a5 of the first filter branch 12 include: a first filter cavity A1, a second filter cavity A2, a third filter cavity A3, a fourth filter cavity A4 and a fifth filter cavity A5; the ten filter cavities C1-C10 of the second filter branch 14 comprise: a first filter cavity C1, a second filter cavity C2, a third filter cavity C3, a fourth filter cavity C4, a fifth filter cavity C5, a sixth filter cavity C6, a seventh filter cavity C7, an eighth filter cavity C8, a ninth filter cavity C9, and a tenth filter cavity C10.

The first filtering branch 12 and the second filtering branch 14 of the filter 10 are arranged along the second direction y of the shell, and the filtering cavities in each filtering branch are arranged in a row along the first direction x of the shell, so that the cavities are arranged regularly and reasonably, the overlong length of the filter in a certain direction is avoided, the size of the filter 10 is reduced, the whole filter 10 is square relatively, and the miniaturized design requirement is met.

In addition, the coupling zero point of the filtering branch of this embodiment can improve the out-of-band rejection and other characteristics of the filtering signal of the filtering branch.

Alternatively, as shown in fig. 1, the five filter cavities a1-a5 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 filter cavity a1, the second filter cavity a2, and the third filter cavity A3 of the first filter branch 12 are in a row and are adjacently arranged along the second direction y, and the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 12 are in a row and are adjacently arranged along the second direction y; the fourth filter cavity a4 of the first filter branch 12 is also arranged adjacent to the second filter cavity a2 and the third filter cavity A3, respectively, of the first filter 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, so that the arrangement space of the first filter branch 12 can be reduced; and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the first filter branch 12 can be further reduced.

Further, as shown in fig. 1, the five filter cavities a1-a5 of the first filter branch 12 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 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.

Further, as shown in fig. 1, the second filtering cavity a2 and the third filtering cavity A3 of the first filtering branch 12 are arranged in an intersecting manner, and by the intersecting arrangement between the filtering cavities, a partition wall is required to be arranged before 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.

As shown in fig. 1, the second filter cavity a2 of the first filter branch 12 is inductively cross-coupled with the fourth filter cavity a4 of the first filter branch 12 to form an inductive coupling zero of the first filter branch 12. As is clear from the above analysis, the inductive coupling zero can reduce the temperature drift of the filter 10, and therefore, the stability of the filter 10 can be improved.

Alternatively, as shown in fig. 1, the ten filter cavities C1-C10 of the second filter branch 14 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.

The first filtering cavity C1, the third filtering cavity C3, the fifth filtering cavity C5, the sixth filtering cavity C6 and the ninth filtering cavity C9 of the second filtering branch 14 are in a row and are sequentially and adjacently arranged along the second direction y; the second filtering cavity C2, the fourth filtering cavity C4, the seventh filtering cavity C7, the eighth filtering cavity C8 and the tenth filtering cavity C10 of the second filtering branch 14 are in a row and are sequentially and adjacently arranged along the second direction y; the first filtering cavity C1 of the second filtering branch 14 is also adjacently disposed to the second filtering cavity C2 of the second filtering branch 14, the third filtering cavity C3 of the second filtering branch 14 is also adjacently disposed to the fourth filtering cavity C4 of the second filtering branch 14, the fourth filtering cavity C4 of the second filtering branch 14 is also adjacently disposed to the fifth filtering cavity C5 of the second filtering branch 14, the sixth filtering cavity C6 of the second filtering branch 14 is also adjacently disposed to the seventh filtering cavity C7 of the second filtering branch 14, and the eighth filtering cavity C8 of the second filtering branch 14 is also adjacently disposed to the ninth filtering cavity C9 of the second filtering branch 14.

As can be seen from the above analysis, two rows of filter cavities of the second filter branch 14 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the second filter branch 14 can be reduced; and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the second filter branch 14 can be further reduced.

Further, as shown in fig. 1, the ten filter cavities C1-C10 of the second filter branch 14 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 cavities in the row of the second filter branch 14 can be more compact, and the arrangement space of the second filter branch 14 can be reduced.

Further, as shown in fig. 1, the third filtering cavity C3 and the fifth filtering cavity C5 of the second filtering branch 14 are arranged in an intersecting manner, and by the intersecting arrangement between the filtering cavities, a partition wall is required to be arranged before 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.

The present application further proposes another embodiment of a filter, as shown in fig. 2 to 6, fig. 2 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 3 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 4 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application; FIG. 5 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application; FIG. 6 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application; FIG. 7 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The structure of the first filtering branch 12 in the filter 10 of this embodiment is the same as that of the first filtering branch 12, which is not described herein again; the structure of the second filtering branch 14 in the filter 10 of this embodiment is the same as the structure of the second filtering branch 14, and is not described herein again.

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 inductive coupling zero is implemented by a window, and a metal coupling rib is disposed on the window, that is, a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 3) are disposed between the second filter cavity a2 of the first filter branch 12 and the fourth filter cavity a4 of the first filter branch 12, a window and a metal coupling rib (equivalent to the capacitor L3 shown in fig. 4) are disposed between the fifth filter cavity C5 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14, and a window and a metal coupling rib (equivalent to the capacitor L4 shown in fig. 4) are disposed between the eighth filter cavity C8 of the second filter branch 14 and the tenth filter cavity C10 of the second filter branch 14, where in the present embodiment, the inductive cross coupling is implemented by the metal coupling rib, and the metal coupling rib is subject to a small change of an external temperature, so as to reduce a temperature drift of the filter 10.

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. 4, a flying bar (equivalent to the capacitor C1 shown in fig. 4) is disposed between the fourth filter cavity C4 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14.

Optionally, as shown in fig. 2, the filter 10 further includes: the third filtering branch 13 is arranged on the shell 11, the third filtering branch 13 is composed of five filtering cavities B1-B5 which are coupled in sequence, and the five filtering cavities B1-B5 form a coupling zero point of the third filtering branch 13; the fourth filtering branch 15 is arranged on the shell 11, the fourth filtering branch 15 is composed of ten filtering cavities D1-D10 which are coupled in sequence, and the ten filtering cavities D1-D10 form three coupling zeros of the fourth filtering branch 15; the third filtering branch 13 and the first filtering branch 12 are symmetrically arranged along a midline of the shell 11 in the first direction x; the fourth filter branch 15 and the second filter branch 14 are symmetrically disposed along a center line of the housing 11 in the first direction x.

The symmetrical distribution of the filtering branches can simplify the structure of the filter 10, reduce the complexity of the filter 10, and further reduce the cost of the filter 10.

As shown in fig. 2, the five filter cavities B1-B5 of the third filter branch 13 include: a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4 and a fifth filter cavity B5; the ten filter cavities D1-D10 of the fourth filter branch 15 comprise: 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.

The third filtering branch 13 and the fourth filtering branch 15 of the filter 10 of the present embodiment are symmetrically distributed along the midline of the housing 11, so that the structure of the filter 10 can be simplified, the complexity of the filter 10 can be reduced, and the cost of the filter 10 can be further reduced.

In addition, the coupling zero point of the filtering branch of this embodiment can improve the out-of-band rejection and other characteristics of the filtering signal of the filtering branch.

Alternatively, as shown in fig. 2, the five filter cavities B1-B5 of the third 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. 2, the first filter cavity B1, the second filter cavity B2 and the third filter cavity B3 of the third filter branch 13 are in a row and are sequentially and adjacently arranged along the second direction y; the fourth filter cavity B4 of the third filter branch 13 is also respectively in a column with the second filter cavity B2 and the third filter cavity B3 and is sequentially arranged adjacently along the second direction y.

As can be seen from the above analysis, the two rows of filter cavities of the third filter branch 13 are adjacently disposed, and the plurality of filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the third filter branch 13 can be reduced; and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the third filter branch 13 can be further reduced.

Further, as shown in fig. 2, the five filter cavities B1-B5 of the third filter branch 13 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 cavity array of the third filter branch 13 can be more compact, and the arrangement space of the third filter branch 13 can be reduced.

Further, as shown in fig. 2, the second filtering cavity B2 and the third filtering cavity B3 of the third filtering branch 13 are arranged in an intersecting manner, and by the intersecting arrangement between the filtering cavities, a partition wall is required to be arranged before 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.

In other embodiments, the fifth filter cavity in the filter branch may be disposed adjacent to the second filter cavity in the branch, so that the filter branch array cavity is more compact.

As shown in fig. 2, the second filter cavity B2 of the third filter branch 13 is inductively cross-coupled with the fourth filter cavity B4 of the third filter branch 13 to form an inductive coupling zero of the third filter branch 13. As is clear from the above analysis, the inductive coupling zero can reduce the temperature drift of the filter 10, and therefore, the stability of the filter 10 can be improved.

Optionally, the first filtering branch 12 and the third filtering branch 13 are arranged at an interval, so that signal crosstalk between the filtering signal of the first filtering branch 12 and the filtering signal of the third filtering branch 13 can be reduced; and the projection of the center of the fourth filter cavity a4 of the first filter branch 12 in the first direction x is located between the projection of the center of the second filter cavity a2 of the first filter branch 12 in the first direction x and the projection of the center of the fourth filter cavity B4 of the third filter branch 13 in the first direction x, so that a common reserved area (columns with fewer cavities arranged are arranged close to each other) can be formed between the first filter branch 12 and the third filter branch 13, and ports for arranging the reserved area are more concentrated.

As shown in fig. 2, the ten filter cavities D1-D10 of the fourth filter branch 15 are divided into two rows 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. 2, the first filter cavity D1, the third filter cavity D3, the fifth filter cavity D5, the sixth filter cavity D6 and the ninth filter cavity D9 of the fourth filter branch 15 are in a row and are sequentially and adjacently arranged along the second direction y; the second filtering cavity D2, the fourth filtering cavity D4, the seventh filtering cavity D7, the eighth filtering cavity D8 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 first filtering cavity D1 of the fourth filtering branch 15 is also disposed adjacent to the second filtering cavity D2 of the fourth filtering branch 15, the third filtering cavity D3 of the fourth filtering branch 15 is also disposed adjacent to the fourth filtering cavity D4 of the fourth filtering branch 15, the fourth filtering cavity D4 of the fourth filtering branch 15 is also disposed adjacent to the fifth filtering cavity D5 of the fourth filtering branch 15, the sixth filtering cavity D6 of the fourth filtering branch 15 is also disposed adjacent to the seventh filtering cavity D7 of the fourth filtering branch 15, and the eighth filtering cavity D8 of the fourth filtering branch 15 is also disposed adjacent to the ninth filtering cavity D9 of the fourth filtering branch 15.

As can be seen from the above analysis, two rows of filter cavities of the fourth filter branch 15 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the fourth filter branch 15 can be reduced; and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the fourth filter branch 15 can be further reduced.

Further, as shown in fig. 2, the ten filter cavities D1-D10 of the fourth filter branch 15 have the same size, and it can be known from the arrangement of the filter cavities that the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the fourth filter branch 15 can be more compact, and the arrangement space of the fourth filter branch 15 can be reduced.

Further, as shown in fig. 2, the third filtering cavity D3 and the fifth filtering cavity D5 of the fourth filtering branch 15 are arranged in an intersecting manner, and by the intersecting arrangement between the filtering cavities, a partition wall is required to be arranged before 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.

In other embodiments, the cavity array of the fourth filtering branch may be slightly adjusted, for example, the eighth filtering cavity of the fourth filtering branch intersects with the tenth filtering cavity, the eighth filtering cavity is adjacent to the sixth filtering cavity, and the seventh filtering cavity is adjacent to the fifth filtering cavity.

Wherein, as shown in fig. 2, the projection of the center of the first filter cavity C1 of the second filter branch 14 in the first direction x is located between the projection of the center of the second filter cavity C2 of the second filter branch 14 in the first direction x and the projection of the center of the first filter cavity D1 of the fourth filter branch 15 in the first direction x. The distance between the first filter cavity C1 of the second filter branch 14 and the first filter cavity D1 of the fourth filter branch 15 can be made smaller, which is convenient for the centralized arrangement of the input ports of the second filter branch 14 and the fourth filter branch 15.

As shown in fig. 2, the fourth filtering cavity D4 of the fourth filtering branch 15 and the seventh filtering cavity D7 of the fourth filtering branch 15 are capacitively cross-coupled to form a capacitive coupling zero point of the fourth filtering branch 15, and the 15 fifth filtering cavity D5 of the fourth filtering branch and the seventh filtering cavity D7 of the fourth filtering branch 15, and the eighth filtering cavity D8 of the fourth filtering branch 15 and the tenth filtering cavity D10 of the fourth filtering branch 15 are inductively cross-coupled to form two inductive coupling zero points of the fourth filtering branch 15, respectively.

A flying bar (equivalent to the capacitor C2 shown in fig. 6) may be provided between the fourth filter cavity D4 and the seventh filter cavity D7 of the fourth filter branch 15. As can be seen from the above analysis, the distance between the fourth filter cavity C4 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14 and the distance between the fourth filter cavity D4 of the fourth filter branch 15 and the seventh filter cavity D7 of the fourth filter branch 15 are equal, so that the flying bar elements with the same specification can be adopted, so as to achieve the effect of implementing one capacitive coupling zero point of the second filter branch 14 and one capacitive coupling zero point of the fourth filter branch 15. When the second filtering branch 14 and the fourth filtering branch 15 are formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

A window and a metal coupling rib (equivalent to the capacitor L2 shown in fig. 5) may be disposed before the second filter cavity B2 and the fourth filter cavity B4 of the third filter branch 13, a window and a metal coupling rib (equivalent to the capacitor L5 shown in fig. 6) may be disposed between the fifth filter cavity D5 of the fourth filter branch 15 and the seventh filter cavity D7 of the fourth filter branch 15, and a window and a metal coupling rib (equivalent to the capacitor L6 shown in fig. 6) 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, where in this embodiment, the inductive cross coupling is implemented by the metal coupling rib, and the metal coupling rib is subjected to a small change in external temperature, so as to reduce the temperature drift of the filter 10.

Optionally, as shown in fig. 2, the first filtering branch 12 and the second filtering branch 14 are disposed along the second direction y, the third filtering branch 13 and the fourth filtering branch 15 are disposed along the second direction y, the first filtering branch 12 and the third filtering branch 13 are disposed at an interval along the first direction x, and the second filtering branch 14 and the fourth filtering branch 15 are disposed at an interval.

Each filtering branch is arranged at intervals, so that the crosstalk of signals among the filtering branches can be reduced; in addition, the first filtering branch 12 and the third filtering branch 13 of this embodiment are both transmitting filtering branches, and the second filtering branch 14 and the fifth filtering branch 15 are both receiving filtering branches.

In particular, the projection of the centre of the fourth filter cavity a4 of the first filter branch 12 in the first direction x is located between the projection of the centre of the second filter cavity a2 of the first filter branch 12 in the first direction x and the projection of the centre of the fourth filter cavity B4 of the third filter branch 13 in the first direction x; the projection of the center of the first filter cavity a1 of the first filter branch 12 in the second direction y is located between the projection of the center of the fifth filter cavity a5 of the first filter branch 12 in the second direction y and the projection of the center of the first filter cavity C1 of the second filter branch 14 in the second direction y.

Optionally, as shown in fig. 2, the housing 11 is further provided with: a first input port (not shown), a first output port (not shown), a second input port (not shown), a second output port (not shown), a third input port (not shown), a third output port (not shown), a fourth input port (not shown), and a fourth output port (not shown); the first filter cavity a1 of the first filter branch 12 is connected to the first input port, and the fifth filter cavity a5 of the first filter branch 12 is connected to the first output port; the first filter cavity C1 of the second filter branch 14 is connected to the second input port, and the tenth filter cavity C10 of the second filter branch 14 is connected to the second output port; the first filter cavity B1 of the third filter branch 13 is connected to the third input port, and the fifth filter cavity B5 of the third filter branch 13 is connected to the third output port; the first filter cavity D1 of the fourth filter branch 15 is connected to the fourth input port, and the tenth filter cavity D10 of the fourth filter branch 15 is connected to the fourth output port.

In this embodiment, the first input port, the first output port, the second input port, the second output port, the third input port, the third output port, the fourth input port, and the fourth output port may all be taps of the filter 10, and input and output of the filtered signal of each branch can be achieved.

Further, the housing is further provided with a coupling cavity E1 and a coupling cavity E2, the first filtering cavity a1 of the first filtering branch 12 is connected with the first port through the coupling cavity E1, and the first filtering cavity B1 of the third filtering branch 13 is connected with the third port through the coupling cavity E2.

As shown in fig. 7, the bandwidth of the first filter branch 12 of the present embodiment lies in the range 1733MHz-1787 MHz. In particular, the coupling bandwidth between the first input port and the first filter cavity a1 of the first filter branch 12 ranges from 53MHz to 62 MHz; the coupling bandwidth between the first filter cavity a1 of the first filter branch 12 and the second filter cavity a2 of the first filter branch 12 ranges from 41MHz to 50 MHz; the coupling bandwidth between the second filter cavity a2 of the first filter branch 12 and the third filter cavity A3 of the first filter branch 12 ranges from 28MHz to 35 MHz; the coupling bandwidth between the second filter cavity a2 of the first filter branch 12 and the fourth filter cavity a4 of the first filter branch 12 ranges from 6MHz to 11 MHz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 12 and the fourth filter cavity a4 of the first filter branch 12 ranges from 28MHz to 35 MHz; the coupling bandwidth between the fourth filter cavity a4 of the first filter branch 12 and the fifth filter cavity a5 of the first filter branch 12 ranges from 41MHz to 50 MHz; the coupling bandwidth between the twelfth and fifth filter cavities a5 of the first filter branch 12 and the first output port is in the range of 53MHz to 62MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity a1 to the fifth filter cavity a5 of the first filter branch 12 are sequentially in the following ranges: 1758MHz-1760MHz, 1766MHz-1768MHz, 1758MHz-1760 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. 7, the bandwidth of the first filtering branch 12 is in the range of 1733MHz to 1787MHz, as shown in a frequency band curve S1 in fig. 7, the coupling zero of the first filtering branch 12 includes a, the coupling zero a enables the bandwidth rejection of 1559MHz to 1715MHz to be greater than 10dB, and the bandwidth rejection of 1830MHz to 2200MHz to be greater than 60dB, so that the out-of-band rejection performance of the first filtering branch 12 can be improved.

As shown in fig. 7, the bandwidth of the second filtering branch 14 of the present embodiment is in the range of 1828MHz to 1882 MHz. Specifically, the coupling bandwidth between the second input port and the first filter cavity C1 of the second filter branch 14 is in the range of 48MHz-58 MHz; the coupling bandwidth between the first filter cavity C1 of the second filter branch 14 and the second filter cavity C2 of the second filter branch 14 ranges from 38MHz to 47 MHz; the coupling bandwidth between the second filter cavity C2 of the second filter branch 14 and the third filter cavity C3 of the second filter branch 14 is in the range of 26MHz-33 MHz; the coupling bandwidth between the third filter cavity C3 of the second filter branch 14 and the fourth filter cavity C4 of the second filter branch 14 ranges from 23MHz to 30 MHz; the coupling bandwidth between the fourth filter cavity C4 of the second filter branch 14 and the fifth filter cavity C5 of the third filter branch 14 ranges from 23MHz to 30 MHz; the coupling bandwidth between the fourth filter cavity C4 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14 is in the range of (-6) MHz- (-2) MHz; the coupling bandwidth between the fifth filter cavity C5 of the second filter branch 14 and the sixth filter cavity C6 of the second filter branch 14 ranges from 22MHz to 29 MHz; the coupling bandwidth between the fifth filter cavity C5 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14 ranges from 11MHz to 17 MHz; the coupling bandwidth between the sixth filter cavity C6 of the second filter branch 14 and the seventh filter cavity C7 of the second filter branch 14 ranges from 19MHz to 25 MHz; the coupling bandwidth between the seventh filter cavity C7 of the second filter branch 14 and the eighth filter cavity C8 of the second filter branch 14 ranges from 24MHz to 31 MHz; the coupling bandwidth between the eighth filter cavity C8 of the second filter branch 14 and the ninth filter cavity C9 of the second filter branch 14 ranges from 19MHz to 25 MHz; the coupling bandwidth between the eighth filter cavity C8 of the second filter branch 14 and the tenth filter cavity C10 of the second filter branch 14 ranges from 21MHz to 27 MHz; the coupling bandwidth between the ninth filtering cavity C9 of the second filtering branch 14 and the tenth filtering cavity C10 of the second filtering branch 14 ranges from 31MHz to 39 MHz; the coupling bandwidth between the tenth filtering cavity C10 of the second filtering branch 14 and the second output port is in the range of 48MHz-58MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity C1 through the tenth filter cavity C10 of the second filter branch 14 are sequentially in the following ranges: 1854MHz-1856MHz, 1853MHz-1855MHz, 1851MHz-1853MHz, 1868MHz-1870MHz, 1853MHz-1855MHz, 1851MHz-1853MHz, 1871MHz-1873MHz, 1854MHz-1856 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. 7, the bandwidth of the second filtering branch 14 is in the range of 1828MHz-1882MHz, and as shown by the frequency band curve S2 in fig. 7, the coupling zeros of the second filtering branch 14 include b, c, and d, and these coupling zeros make the bandwidth rejection of the frequency band 1735MHz-1785MHz greater than 109dB, the bandwidth rejection of the frequency band 1785MHz-1820MHz greater than 12dB, the bandwidth rejection of the frequency band 19885MHz-1900MHz greater than 43dB, the bandwidth rejection of the frequency band 1900MHz-1920MHz greater than 37dB, and the bandwidth rejection of the frequency band 1920MHz-1980MHz greater than 84dB, so that the out-of-band rejection performance of the third filtering branch 14 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; the radio frequency parameters of the third filtering branch 13 are similar to those of the first filtering branch 12, and the radio frequency parameters of the fourth filtering branch 15 are similar to those of the second filtering branch 14, which are not described herein again.

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

The present application further provides a communication device, as shown in fig. 8, fig. 8 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 five filtering cavities which are sequentially coupled along a first coupling path, and an inductive coupling zero point of the first filtering branch is formed; the second filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three inductive coupling zeros of the second filtering branch are formed; the first filtering branch and the second filtering branch are arranged along the second direction, five filtering cavities of the first filtering branch are divided into two rows arranged along the first direction, and ten filtering cavities of the second filtering branch are divided into two rows arranged along the first direction. In this way, the first filtering branch and the second filtering branch of the filter of the embodiment of the present application are arranged along the second direction of the casing, and the filtering cavities in each filtering branch are all arranged in a row along the first direction of the casing, so that the cavity arrangement is regular and reasonable, the length in a certain direction of the filter is avoided being too long, the size of the filter is reduced, the whole filter is square and regular, and the design requirement of miniaturization is met.

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

Claims (10)

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

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

the first filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a first coupling path, and a coupling zero point of the first filtering branch is formed;

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

the first filtering branch and the second filtering branch are arranged along the second direction, five filtering cavities of the first filtering branch are divided into two rows arranged along the first direction, and ten filtering cavities of the second filtering branch are divided into two rows arranged along the first direction.

2. The filter according to claim 1, wherein the first filter cavity, the second filter cavity and the third filter cavity of the first filter branch are in a row and are adjacently arranged along the second direction, and the fourth filter cavity and the fifth filter cavity of the first filter branch are in a row and are adjacently arranged along the second direction;

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

and the second filter cavity of the first filter branch circuit is inductively cross-coupled with the fourth filter cavity of the first filter branch circuit to form an inductive coupling zero point of the first filter branch circuit.

3. The filter according to claim 2, wherein the first, third, fifth, sixth and ninth filter cavities of the second filter branch are in a row and are sequentially arranged adjacently along the second direction;

the second filtering cavity, the fourth filtering cavity, the seventh filtering cavity, the eighth 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;

the first filter cavity of the second filter branch is also arranged adjacent to the second filter cavity of the second filter branch, the third filter cavity of the second filter branch is also arranged adjacent to the fourth filter cavity of the second filter branch, the fifth filter cavity of the second filter branch is also arranged adjacent to the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch is also arranged adjacent to the seventh filter cavity of the second filter branch, and the eighth filter cavity of the second filter branch is also arranged adjacent to the ninth filter cavity of the second filter branch;

the projection of the center of the first filter cavity of the second filter branch in the first direction is positioned between the projection of the center of the second filter cavity of the second filter branch in the first direction and the projection of the center of the first filter cavity of the second filter branch in the first direction;

and the fourth filter cavity of the second filter branch and the seventh filter cavity of the second filter branch are capacitively cross-coupled to form a capacitive coupling zero point of the second filter branch, and the fifth filter cavity of the second filter branch and the seventh filter cavity of the second filter branch, and the eighth filter cavity of the second filter branch and the tenth filter cavity of the second filter branch are inductively cross-coupled to form two inductive coupling zero points of the second filter branch.

4. The filter of claim 3, wherein the filter further comprises:

the third filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled, and a coupling zero point of the third filtering branch is formed;

and the fourth filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the fourth filtering branch are formed.

5. The filter according to claim 4, wherein the third filtering branch and the first filtering branch are symmetrically arranged along a bisector of the housing in the first direction;

and the second filter cavity of the third filter branch circuit is inductively cross-coupled with the fourth filter cavity of the third filter branch circuit to form an inductive coupling zero point of the second filter branch circuit.

6. The filter of claim 5,

the fourth filtering branch and the second filtering branch are symmetrically arranged along a midline of the shell in the first direction;

and a fourth filtering cavity of the fourth filtering branch and a seventh filtering cavity of the fourth filtering branch are capacitively cross-coupled to form a capacitive coupling zero point of the fourth filtering branch, and a fifth filtering cavity of the fourth filtering branch and the seventh filtering cavity of the fourth filtering branch, and an eighth filtering cavity of the fourth filtering branch and a tenth filtering cavity of the fourth filtering branch are inductively cross-coupled to form two inductive coupling zero points of the fourth filtering branch.

7. The filter according to claim 6, wherein the first filtering branch and the second filtering branch are disposed along the second direction, the third filtering branch and the fourth filtering branch are disposed along the second direction, and the first filtering branch and the third filtering branch are disposed along the first direction at an interval, and the second filtering branch and the fourth filtering branch are disposed at an interval.

8. The filter according to claim 7, wherein a projection of a center of a fourth filter cavity of the first filter branch in the first direction is located between a projection of a center of a second filter cavity of the first filter branch in the first direction and a projection of a center of a fourth filter cavity of the third filter branch in the first direction; the projection of the center of the first filter cavity of the first filter branch in the second direction is located between the projection of the center of the fifth filter cavity of the first filter branch in the second direction and the projection of the center of the first filter cavity of the second filter branch in the second direction.

9. The filter of claim 7, wherein the housing further comprises:

the first input port is connected with a first filter cavity of the first filter branch, and the first output port is connected with a fifth filter cavity of the first filter branch;

the second input port is connected with the first filter cavity of the second filter branch, and the second output port is connected with the tenth filter cavity of the second filter branch;

the third input port is connected with the first filter cavity of the first filter branch circuit, and the third output port is connected with the fifth filter cavity of the third filter branch circuit;

the fourth input port is connected with the first filtering cavity of the first filtering branch, and the fourth output port is connected with the tenth filtering cavity of the fourth filtering branch.

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

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