CN113131153A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113131153A CN113131153A CN201911418112.8A CN201911418112A CN113131153A CN 113131153 A CN113131153 A CN 113131153A CN 201911418112 A CN201911418112 A CN 201911418112A CN 113131153 A CN113131153 A CN 113131153A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
Abstract
The application discloses wave filter and communication equipment, this wave filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled, the ten filtering cavities of the first filtering branch form four capacitive cross-coupling zero points, and the distance between two adjacent filtering cavities in the first filtering branch is a preset threshold value. By the method, on one hand, four capacitive cross coupling zero points are formed, and the materials of the four capacitive cross coupling zero points are the same, so that the types of the materials can be reduced, and the stability of the product is improved; on the other hand, the distance between two adjacent filter cavities is a preset threshold value, so that the design and the arrangement of the filter structure can be facilitated, and the size of the filter is reduced.
Description
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 mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.
The inventor of the present application finds, in long-term research and development work, that in the prior art, the arrangement modes of the filter cavities of the filter branches of the filter are not completely the same, and especially, the distances between adjacent filter cavities are not the same, so that the problem that the size of the existing filter is too large is caused. And when a plurality of cross coupling zero points are formed, the plurality of cross coupling zero points comprise inductive cross coupling zero points and capacitive cross coupling zero points, different materials are needed to manufacture different cross coupling zero points during manufacturing, the consistency of materials is poor, and the stability of products is low.
Disclosure of Invention
The technical problem that this application mainly solved provides a wave filter and communication equipment to solve above-mentioned problem.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on one side of the shell and consists of ten filtering cavities which are sequentially coupled, the ten filtering cavities of the first filtering branch form four capacitive cross-coupling zero points, and the distance between two adjacent filtering cavities in the first filtering branch is a preset threshold value. The distance between two adjacent filter cavities is a preset threshold value, so that the design and the manufacture are convenient, and the size of the filter can be reduced. And the cross coupling zero points are capacitive cross coupling zero points, the material consistency is good, the types of materials can be reduced under the condition of meeting the design requirements, and the stability of the product is improved.
Furthermore, the eighth filtering cavity, the seventh filtering cavity, the first filtering cavity and the second filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction, and the seventh filtering cavity and the first filtering cavity of the first filtering branch are arranged at intervals; the tenth filtering cavity, the ninth filtering cavity, the sixth filtering cavity, the fifth filtering cavity, the fourth filtering cavity and the third filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction. The filter is divided into two rows which are orderly arranged along the second direction, so that the design, the manufacture and the reduction of the volume of the filter are facilitated. The gap left by the interval arrangement of the seventh filter cavity and the first filter cavity of the first filter branch can be provided with a low-pass filter module and a port, so that the structure is compact and the size of the filter is reduced.
Furthermore, a ninth filtering cavity of the first filtering branch is respectively adjacent to a sixth filtering cavity, a seventh filtering cavity, an eighth filtering cavity and a tenth filtering cavity of the first filtering branch, and a fourth filtering cavity of the first filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the third filtering cavity and the fifth filtering cavity of the first filtering branch. The gap between the filter cavities is reduced by the adjacent arrangement, so that the volume of the filter is further reduced.
Further, capacitive cross coupling is respectively performed between the first filter cavity and the fourth filter cavity of the first filter branch, between the second filter cavity and the fourth filter cavity of the first filter branch, between the sixth filter cavity and the ninth filter cavity of the first filter branch, and between the seventh filter cavity and the ninth filter cavity of the first filter branch, so as to form four capacitive cross coupling zeros of the first filter branch. The coupling zero points are capacitive coupling zero points, the material consistency is good, and the stability of the product is improved.
Furthermore, the filter also comprises a second filtering branch which is arranged adjacent to the first filtering branch, the second filtering branch is composed of ten filtering cavities which are coupled in sequence, and the ten filtering cavities of the second filtering branch form four capacitive cross-coupling zero points. The coupling zero points are capacitive coupling zero points, the material consistency is good, and the stability of the product is improved.
Furthermore, a tenth filtering cavity, a ninth filtering cavity, a sixth filtering cavity, a fifth filtering cavity, a fourth filtering cavity and a third filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction; the eighth filtering cavity, the seventh filtering cavity, the first filtering cavity and the second filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction, and the seventh filtering cavity and the first filtering cavity of the second filtering branch are arranged at intervals. The filter is divided into two rows which are orderly arranged along the second direction, so that the design, the manufacture and the reduction of the volume of the filter are facilitated. A gap left by the interval arrangement of the seventh filter cavity and the first filter cavity of the second filter branch can be provided with a low-pass filter module and a port, so that the structure is compact and the size of the filter is reduced.
Furthermore, a ninth filtering cavity of the second filtering branch is respectively adjacent to the ninth filtering cavity of the first filtering branch and a sixth filtering cavity, a seventh filtering cavity, an eighth filtering cavity and a tenth filtering cavity of the second filtering branch, and a fourth filtering cavity of the second filtering branch is respectively adjacent to the fourth filtering cavity of the first filtering branch and the first filtering cavity, the second filtering cavity, the third filtering cavity and the fifth filtering cavity of the second filtering branch. The gap between the filter cavities is reduced by the adjacent arrangement, so that the volume of the filter is further reduced.
Further, capacitive cross coupling is respectively performed between the first filtering cavity and the fourth filtering cavity of the two filtering branches, between the second filtering cavity and the fourth filtering cavity of the second filtering branch, between the sixth filtering cavity and the ninth filtering cavity of the two filtering branches, and between the seventh filtering cavity and the ninth filtering cavity of the second filtering branch, so as to form four capacitive cross coupling zeros of the second filtering branch. The coupling zero points are capacitive coupling zero points, the material consistency is good, and the stability of the product is improved.
Further, the filter comprises a first low-pass filtering module, a first port, a second low-pass filtering module, a third port and a fourth port, the first low-pass filtering module is used for coupling the first filtering cavity and the first port of the first filtering branch, the second port is coupled with the tenth filtering cavity of the first filtering branch, the second low-pass filtering module is used for coupling the first filtering cavity and the third port of the second filtering branch, and the fourth port is coupled with the tenth filtering cavity of the second filtering branch. The low-pass filtering module is arranged to meet the design requirement, and the port and the low-pass filtering module are arranged in the gap formed by the filtering cavity, so that the size of the filter can be reduced.
In order to solve the above technical problem, the present application further provides a communication device, where the communication device includes an antenna and a radio frequency unit, the antenna is connected to the radio frequency unit, the radio frequency unit includes a filter, and the filter is the above filter.
The beneficial effects of the embodiment of the application are that: different from the prior art, on one hand, the first filtering branch and the second filtering branch both form four capacitive cross coupling zero points, and the materials of the four capacitive cross coupling zero points are the same, so that the types of the materials can be reduced, and the stability of the product is improved; on the other hand, the distance between two adjacent filter cavities is a threshold value, so that the design and the arrangement of the filter structure can be facilitated, and the size of the filter is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of a filter provided in the present application;
FIG. 2 is a schematic of the topology of the filter provided herein;
FIG. 3 is a schematic diagram of a second embodiment of a filter provided herein;
FIG. 4 is a schematic of the topology of the filter provided herein;
FIG. 5 is a diagram illustrating simulation results of a filter provided herein;
fig. 6 is a schematic diagram of an embodiment of a communication device provided in the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Please refer to fig. 1, which is a schematic structural diagram of a filter 10 according to a first embodiment of the present application.
As shown in fig. 1, the filter 10 of the present embodiment includes: the housing 110 has a first direction D1 and a second direction D2, the first direction D1 and the second direction D2 being perpendicular to each other.
The first filtering branch 120 is disposed on one side of the housing 110 and is composed of ten filtering cavities coupled in sequence, the ten filtering cavities of the first filtering branch 120 form four capacitive cross-coupling zeros, and a distance between two adjacent filtering cavities in the first filtering branch 120 is a preset threshold. Wherein, the distance between two adjacent filter cavities is set as a preset threshold value, so that the design and the manufacture are convenient, and the volume of the filter can be reduced.
Preferably, in this embodiment, the first filtering branch 120 is a transmitting filtering branch, but may also be a receiving filtering branch in other embodiments.
The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.
It should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameters are shown as the same coupling zeros.
Specifically, as shown in fig. 1, ten filter cavities of the first filter branch 120 are specifically the first filter cavity a1 of the first filter branch 120 to the tenth filter cavity a10 of the first filter branch 120.
Specifically, as shown in fig. 1, the eighth filtering cavity A8, the seventh filtering cavity a7, the first filtering cavity a1, and the second filtering cavity a2 of the first filtering branch 120 are in a row and are sequentially arranged along the first direction D1, and the seventh filtering cavity a7 and the first filtering cavity a1 of the first filtering branch 120 are arranged at intervals; the tenth filtering cavity a10, the ninth filtering cavity a9, the sixth filtering cavity a6, the fifth filtering cavity a5, the fourth filtering cavity a4 and the third filtering cavity A3 of the first filtering branch 120 are in a row and are sequentially arranged along the first direction D1. By dividing into two columns regularly arranged in sequence along the second direction, it is convenient to design, manufacture and reduce the volume of the filter 10.
Specifically, as shown in fig. 1, the ninth filtering cavity a9 of the first filtering branch 120 is respectively adjacent to the sixth filtering cavity a6, the seventh filtering cavity a7, the eighth filtering cavity A8 and the tenth filtering cavity a10 of the first filtering branch 120, and the fourth filtering cavity a4 of the first filtering branch 120 is respectively adjacent to the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3 and the fifth filtering cavity a5 of the first filtering branch 120. In this way, any two adjacent filter cavities are arranged adjacently, and the size of the filter 10 can be reduced. Specifically, the distance between any two adjacent filter cavities may refer to a distance between centers of any two adjacent filter cavities, or may refer to a closest distance between cavity shells of any two adjacent filter cavities. Specifically, when the distance between any two adjacent filter cavities is the closest distance between the cavity shells of any two adjacent filter cavities, the preset threshold value may be 0, that is, the two filter cavities are adjacently arranged at this time.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram illustrating a topology of a first filtering branch 120 in the filter 10 according to the first embodiment.
As shown in fig. 2, the capacitive cross-coupling between the first filter cavity a1 and the fourth filter cavity a4 of the first filter branch 120, the capacitive cross-coupling between the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch, the capacitive cross-coupling between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 120, and the capacitive cross-coupling between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 120 correspond to C1, C2, C3, and C4, respectively, so as to form four capacitive cross-coupling zeros of the first filter branch 120.
The cross coupling zero points of the first filtering branch 120 are all capacitive cross coupling zero points, the material consistency is good, the types of materials can be reduced under the condition that the design requirements are met, and the stability of the product is improved.
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. That is, flying rods are respectively disposed between the first filter cavity a1 and the fourth filter cavity a4 of the first filter branch 120, between the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch 120, between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 120, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 120. And, the position relationship between the first filter cavity a1 and the fourth filter cavity a4 of the first filter branch 120, between the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch 120, between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 120, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 120 is combined. In this application, between first filtering chamber a1 and the fourth filtering chamber a4 of first filtering branch 120, between second filtering chamber a2 and the fourth filtering chamber a4 of first filtering branch 120, between sixth filtering chamber a6 and the ninth filtering chamber a9 of first filtering branch 120, the distance between seventh filtering chamber a7 and the ninth filtering chamber a9 of first filtering branch 120 equals, consequently, can realize adopting the same specification flying rod component, in order to reach the effect of realizing four capacitive coupling zeros, be convenient for design and manufacturing simultaneously.
Specifically, as shown in fig. 2, the filter 10 further includes a first port D1 coupled to the first filter cavity a1 of the first filter branch 120 and a second port D2 coupled to the tenth filter cavity a10 of the first filter branch 120, wherein both the first port D1 and the second port D2 may be taps of the filter 10.
Further, the resonant frequencies of the first filter cavity a1 through the tenth filter cavity a10 of the first filter branch 120 are sequentially located in the following ranges:
2593Mhz-2595Mhz、2596Mhz-2598Mhz、2580Mhz-2582Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz、2598Mhz-2600Mhz、2580Mhz-2582Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz。
a coupling bandwidth between the first port D1 and the first filter cavity a1 of the first filter branch 120, a coupling bandwidth between the first filter cavity a1 of the first filter branch 120 and the second filter cavity a2 of the first filter branch 120, a coupling bandwidth between the first filter cavity a1 of the first filter branch 120 and the fourth filter cavity A4 of the first filter branch 120, a coupling bandwidth between the second filter cavity a2 of the first filter branch 120 and the third filter cavity A3 of the first filter branch 120, a coupling bandwidth between the second filter cavity a2 of the first filter branch 120 and the fourth filter cavity A4 of the first filter branch 120, a coupling bandwidth between the third filter cavity A3 of the first filter branch 120 and the fourth filter cavity A4 of the first filter branch 120, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 120 and the fifth filter cavity a1 of the first filter branch 120, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 120 and the fifth filter cavity a 8236 of the first filter branch 120, A5 of the fifth filter branch 120, The coupling bandwidth between the sixth filter cavity a6 of the first filter branch 120 and the seventh filter cavity a7 of the first filter branch 120, the coupling bandwidth between the sixth filter cavity a6 of the first filter branch 120 and the ninth filter cavity a9 of the first filter branch 120, the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 120 and the eighth filter cavity A8 of the first filter branch 120, the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 120 and the ninth filter cavity a9 of the first filter branch 120, the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 120 and the ninth filter cavity a9 of the first filter branch 120, the coupling bandwidth between the ninth filter cavity a9 of the first filter branch 120 and the tenth filter cavity a10 of the first filter branch 120, and the coupling bandwidth between the tenth filter cavity a10 and the second port D2 of the first filter branch 120 are respectively in the following ranges:
157Mhz-179Mhz、120Mhz-138Mhz、-32Mhz--31Mhz、102Mhz-118Mhz、-15Mhz--12Mhz、71Mhz-83Mhz、75Mhz-88Mhz、75Mhz-8Mhz、-69Mhz-81Mhz、-32Mhz--31Mhz、104Mhz-119Mhz、-14Mhz--11Mhz、81Mhz-92Mhz、124Mhz-142Mhz、157Mhz-179Mhz。
therefore, the bandwidth of the first filtering branch 120 can be made to be within 2512-2680MHz, and the design requirement is met.
The beneficial effect of this embodiment is: different from the prior art, on one hand, the first filtering branch 120 forms four pure capacitive cross coupling zero points, which can reduce the types of materials and improve the stability of the product; on the other hand, the distance between two adjacent filter cavities is a preset threshold value, so that the design and the arrangement of the filter structure can be facilitated, and the size of the filter is reduced.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the filter 10 of the present application.
Specifically, as shown in fig. 3, on the basis of the first embodiment, the filter 10 further includes a second filtering branch 130 disposed adjacent to the first filtering branch 120, the second filtering branch 130 is composed of ten filtering cavities coupled in sequence, and the ten filtering cavities of the second filtering branch 130 form four capacitive cross-coupling zeros. The second filtering branch 130 is adjacent to the first filtering branch 120, so that the cavity structure of the filter is compact, and the size of the filter is reduced.
Preferably, in this embodiment, the second filtering branch 130 is a transmitting filtering branch, but may also be a receiving filtering branch in other embodiments.
The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. 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.
Specifically, as shown in fig. 3, the ten filter cavities of the second filter branch 130 are specifically the first filter cavity B1 of the second filter branch 130 to the tenth filter cavity B10 of the second filter branch 130.
As shown in fig. 3, the third filter cavity a3 of the first filter branch 120 and the third filter cavity B3 of the second filter branch 130 are disposed adjacent to each other along the second direction D2, and the first and second filter branches are symmetrical due to the regular arrangement, which is convenient for designing, manufacturing and reducing the size of the filter.
Specifically, as shown in fig. 3, the tenth filter cavity B10, the ninth filter cavity B9, the sixth filter cavity B6, the fifth filter cavity B5, the fourth filter cavity B4 and the third filter cavity B3 of the second filter branch 130 are in a row and are sequentially arranged along the first direction D1; the eighth filtering cavity B8, the seventh filtering cavity B7, the first filtering cavity B1 and the second filtering cavity B2 of the second filtering branch 130 are in a row and are sequentially arranged along the first direction D1, and the seventh filtering cavity B7 and the first filtering cavity of the second filtering branch 130 are arranged at intervals.
Specifically, as shown in fig. 3, the ninth filtering cavity B9 of the second filtering branch 130 is respectively disposed adjacent to the ninth filtering cavity a9 of the first filtering branch 120 and the sixth filtering cavity B6, the seventh filtering cavity B7, the eighth filtering cavity B8 and the tenth filtering cavity B10 of the second filtering branch 130, and the fourth filtering cavity B4 of the second filtering branch 130 is respectively disposed adjacent to the fourth filtering cavity a4 of the first filtering branch 120 and the first filtering cavity B1, the second filtering cavity B2, the third filtering cavity B3 and the fifth filtering cavity B5 of the second filtering branch 130. Compared with the equidistant arrangement, the adjacent arrangement can further reduce the gap between the filter cavities of the filter 10, thereby reducing the volume of the filter 10.
Specifically, referring to fig. 4, fig. 4 is a schematic diagram of a topology structure of the second filtering branch 130 in the filter 10 according to the first embodiment.
As shown in fig. 4, the capacitive cross-coupling between the first filter cavity B1 and the fourth filter cavity B4 of the second filter branch 130, the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 130, the sixth filter cavity B6 and the ninth filter cavity B9 of the second filter branch 130, and the seventh filter cavity B7 and the ninth filter cavity B9 of the second filter branch 130 respectively correspond to C1, C2, C3, and C4, respectively, so as to form four capacitive cross-coupling zeros of the second filter branch 130.
The cross coupling zero points of the second filtering branch 130 are all capacitive cross coupling zero points, the material consistency is good, the types of materials can be reduced under the condition of meeting the design requirements, and the stability of the product is improved.
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. That is, flying rods are respectively arranged between the first filtering cavity B1 and the fourth filtering cavity B4 of the second filtering branch 130, between the second filtering cavity B2 and the fourth filtering cavity B4 of the second filtering branch 130, between the sixth filtering cavity B6 and the ninth filtering cavity B9 of the second filtering branch 130, and between the seventh filtering cavity B7 and the ninth filtering cavity B9 of the second filtering branch 130. And, the position relationship between the first filter cavity B1 and the fourth filter cavity B4 of the second filter branch 130, between the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 130, between the sixth filter cavity B6 and the ninth filter cavity B9 of the second filter branch 130, and between the seventh filter cavity B7 and the ninth filter cavity B9 of the second filter branch 130 is combined. In this application, between first filtering chamber B1 and the fourth filtering chamber B4 of second filtering branch 130, between second filtering chamber B2 and the fourth filtering chamber B4 of second filtering branch 130, between sixth filtering chamber B6 and the ninth filtering chamber B9 of second filtering branch 130, the distance between seventh filtering chamber B7 and the ninth filtering chamber B9 of second filtering branch 130 equals, consequently, can realize adopting the same specification flying rod component, in order to reach the effect of realizing four capacitive coupling zeros, be convenient for design and manufacturing simultaneously.
Specifically, the filter 10 further includes a third port D3 coupled to the first filtering cavity B1 of the second filtering branch 130 and a fourth port D4 coupled to the tenth filtering cavity B10 of the second filtering branch 130, wherein the third port D3 and the fourth port D4 are both taps of the filter 10.
Further, the resonant frequencies of the first filter cavity B1 through the tenth filter cavity B10 of the second filter branch 130 are sequentially located in the following ranges:
2593Mhz-2595Mhz、2596Mhz-2598Mhz、2580Mhz-2582Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz、2598Mhz-2600Mhz、2580Mhz-2582Mhz、2593Mhz-2595Mhz、2593Mhz-2595Mhz。
a coupling bandwidth between the third port D3 and the first filter cavity B1 of the second filter branch 130, a coupling bandwidth between the first filter cavity B1 of the second filter branch 130 and the second filter cavity B2 of the second filter branch 130, a coupling bandwidth between the first filter cavity B1 of the second filter branch 130 and the fourth filter cavity B4 of the second filter branch 130, a coupling bandwidth between the second filter cavity B2 of the second filter branch 130 and the third filter cavity B3 of the second filter branch 130, a coupling bandwidth between the second filter cavity B2 of the second filter branch 130 and the fourth filter cavity B4 of the second filter branch 130, a coupling bandwidth between the third filter cavity B3 of the second filter branch 130 and the fourth filter cavity B4 of the second filter branch 130, a coupling bandwidth between the fourth filter cavity B4 of the second filter branch 130 and the fifth filter cavity B86545 of the second filter branch 130, and a coupling bandwidth between the fifth filter cavity B828945 of the second filter branch 130 and the sixth filter cavity B8236 of the second filter branch 130, The coupling bandwidth between the sixth filter cavity B6 of the second filter branch 130 and the seventh filter cavity B7 of the second filter branch 130, the coupling bandwidth between the sixth filter cavity B6 of the second filter branch 130 and the ninth filter cavity B9 of the second filter branch 130, the coupling bandwidth between the seventh filter cavity B7 of the second filter branch 130 and the eighth filter cavity B8 of the second filter branch 130, the coupling bandwidth between the seventh filter cavity B7 of the second filter branch 130 and the ninth filter cavity B9 of the second filter branch 130, the coupling bandwidth between the eighth filter cavity B8 of the second filter branch 130 and the ninth filter cavity B9 of the second filter branch 130, the coupling bandwidth between the ninth filter cavity B9 of the second filter branch 130 and the tenth filter cavity B10 of the second filter branch 130, and the coupling bandwidth between the tenth filter cavity B10 and the fourth port D4 of the second filter branch 130 are respectively in the following ranges:
157Mhz-179Mhz、120Mhz-138Mhz、-32Mhz--31Mhz、102Mhz-118Mhz、-15Mhz--12Mhz、71Mhz-83Mhz、75Mhz-88Mhz、75Mhz-8Mhz、-69Mhz-81Mhz、-32Mhz--31Mhz、104Mhz-119Mhz、-14Mhz--11Mhz、81Mhz-92Mhz、124Mhz-142Mhz、157Mhz-179Mhz。
therefore, the bandwidth of the second filtering branch 130 can be within 2512-2680MHz, and the design requirement can be met.
Specifically, as shown in fig. 3, the filter 10 includes a first low-pass filtering module C1 and a second low-pass filtering module C2, the first low-pass filtering module C1 is configured to couple a first filtering cavity a1 and a first port D1 of the first filtering branch 120, the second port D2 is coupled to a tenth filtering cavity a10 of the first filtering branch 120, the second low-pass filtering module C2 is configured to couple a first filtering cavity B1 and a third port D3 of the second filtering branch 130, and the fourth port D4 is coupled to a tenth filtering cavity B10 of the second filtering branch 130.
Specifically, the first low-pass filtering module C1 is disposed between the first filtering cavity a1 and the seventh filtering cavity a7 of the first filtering branch 120, and the second low-pass filtering module C2 is disposed between the first filtering cavity B1 and the seventh filtering cavity B7 of the second filtering branch 130, so that the design requirement can be met, the structure of the filtering cavity of the filter is compact, and the size of the filter 10 is reduced.
Since the filter 10 needs to filter out unwanted harmonic and noise signals from the received signal, both the first low-pass filtering module C1 and the second low-pass filtering module C2 can suppress high-frequency signals and pass low-frequency signals. That is, low frequency signals can pass through the low pass filter blocks C1 and C2, while high frequency signals cannot. In this embodiment, the low-pass filtering modules C1 and C2 may be passive low-pass filtering modules including resistors and capacitors or passive low-pass filtering modules including resistors, inductors and capacitors, or active low-pass filtering modules including resistors, capacitors and operational amplifiers. Therefore, the filtering of the signals with specific frequencies is realized, and the design requirement is met.
The beneficial effect of this embodiment is: different from the prior art, on one hand, the first filtering branch and the second filtering branch form four pure capacitive cross coupling zero points, so that the types of materials can be reduced, and the stability of a product is improved; on the other hand, the distance between two adjacent filter cavities is a threshold value, so that the design and the arrangement of the filter structure can be facilitated, and the size of the filter is reduced.
Please refer to fig. 5, which is a simulation diagram of the filter of the present application.
As shown in FIG. 5, the bandwidth ranges (see the frequency band 200) of the first and second filtering branches of the present application are located in the 2512.2-2680.5 MHz. And the inhibition at 2300MHz is more than 85dB, the inhibition at 2400MHz is more than 75dB, the inhibition at 2455MHz is more than 55dB, the inhibition at 2483.5MHz is more than 50dB, the inhibition at 2500MHz is more than 52dB, the inhibition at 2700MHz is more than 55dB, the inhibition at 2720MHz is more than 60dB, and the inhibition at 2900MHz is more than 65 dB. Therefore, high-end isolation can be generated between the filtering branches of the embodiment, and the design requirement can be met.
As shown in fig. 6, fig. 6 is a schematic diagram of an embodiment of the communication device 30 of the present application.
The present application further provides a communication device 30, where the communication device 30 of this embodiment includes an antenna 32 and a Radio frequency unit 31, the antenna 32 is connected to the Radio frequency unit 31, and the Radio frequency unit may be an rru (remote Radio unit). The rf unit 31 includes the filter 10 disclosed in the above embodiments, and is used for filtering the rf signal.
In other embodiments, the rf unit 31 may be integrated with the Antenna 32 to form an active Antenna unit (aau).
Therefore, the bandwidth of the radio frequency signals received and transmitted by the communication equipment is within the range of 2512-2681 MHz, and the design requirements can be met.
It should be noted that, some embodiments of the present application refer to the present invention as a filter, and may also be referred to as a combiner, that is, a dual-frequency combiner.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
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 ten filtering cavities which are coupled in sequence, the ten filtering cavities of the first filtering branch form four capacitive cross-coupling zero points, and the distance between any two adjacent filtering cavities in the first filtering branch is a preset threshold value.
2. The filter of claim 1,
the eighth filtering cavity, the seventh filtering cavity, the first filtering cavity and the second filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction, and the seventh filtering cavity and the first filtering cavity of the first filtering branch are arranged at intervals;
the tenth filtering cavity, the ninth filtering cavity, the sixth filtering cavity, the fifth filtering cavity, the fourth filtering cavity and the third filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction.
3. The filter of claim 2,
the ninth filtering cavity of the first filtering branch is respectively adjacent to the sixth filtering cavity, the seventh filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the first filtering branch, and the fourth filtering cavity of the first filtering branch is respectively adjacent to the first filtering cavity, the second filtering cavity, the third filtering cavity and the fifth filtering cavity of the first filtering branch.
4. The filter of claim 3,
capacitive cross coupling is respectively carried out between a first filtering cavity and a fourth filtering cavity of the first filtering branch, between a second filtering cavity and the fourth filtering cavity of the first filtering branch, between a sixth filtering cavity and a ninth filtering cavity of the first filtering branch and between a seventh filtering cavity and the ninth filtering cavity of the first filtering branch so as to form four capacitive cross coupling zeros of the first filtering branch.
5. The filter of claim 4,
the filter further comprises a second filtering branch which is adjacent to the first filtering branch and is composed of ten filtering cavities which are sequentially coupled, and the ten filtering cavities of the second filtering branch form four capacitive cross-coupling zeros.
6. The filter of claim 5,
the tenth filtering cavity, the ninth filtering cavity, the sixth filtering cavity, the fifth filtering cavity, the fourth filtering cavity and the third filtering cavity of the second filtering branch are in a row and are sequentially arranged along the first direction;
the eighth filtering cavity, the seventh filtering cavity, the first filtering cavity and the second filtering cavity of the second filtering branch are arranged in a row and along the first direction in sequence, and the seventh filtering cavity and the first filtering cavity of the second filtering branch are arranged at intervals.
7. The filter of claim 6,
the ninth filtering cavity of the second filtering branch is respectively adjacent to the ninth filtering cavity of the first filtering branch and the sixth filtering cavity, the seventh filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the second filtering branch, and the fourth filtering cavity of the second filtering branch is respectively adjacent to the fourth filtering cavity of the first filtering branch and the first filtering cavity, the second filtering cavity, the third filtering cavity and the fifth filtering cavity of the second filtering branch.
8. The filter of claim 7,
and capacitive cross coupling is respectively carried out between a first filtering cavity and a fourth filtering cavity of the two filtering branches, between a second filtering cavity and a fourth filtering cavity of the second filtering branch, between a sixth filtering cavity and a ninth filtering cavity of the two filtering branches and between a seventh filtering cavity and a ninth filtering cavity of the second filtering branch so as to form four capacitive cross coupling zeros of the second filtering branch.
9. The filter of claim 5,
the filter comprises a first low-pass filtering module, a first port, a second low-pass filtering module, a third port and a fourth port, wherein the first low-pass filtering module is used for coupling a first filtering cavity of a first filtering branch and the first port, the second port is coupled with a tenth filtering cavity of the first filtering branch, the second low-pass filtering module is used for coupling the first filtering cavity of the second filtering branch and the third port, and the fourth port is coupled with the tenth filtering cavity of the second filtering branch.
10. A communication device comprising an antenna and a radio frequency unit, the antenna being connected to the radio frequency unit, the radio frequency unit comprising a filter according to any one of claims 1 to 9 for filtering radio frequency signals.
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| CN201911418112.8A CN113131153A (en) | 2019-12-31 | 2019-12-31 | Filter and communication equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911418112.8A CN113131153A (en) | 2019-12-31 | 2019-12-31 | Filter and communication equipment |
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| JPH11136001A (en) * | 1997-10-31 | 1999-05-21 | Sumitomo Metal Ind Ltd | Laminated stripline filter improved in frequency characteristic |
| US20060267712A1 (en) * | 2005-05-24 | 2006-11-30 | Morga Justin R | Filter with multiple shunt zeros |
| CN203039062U (en) * | 2012-12-07 | 2013-07-03 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio-frequency apparatus |
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Application publication date: 20210716 |