CN113036339A - Communication system and filter thereof - Google Patents
Communication system and filter thereof Download PDFInfo
- Publication number
- CN113036339A CN113036339A CN201911359608.2A CN201911359608A CN113036339A CN 113036339 A CN113036339 A CN 113036339A CN 201911359608 A CN201911359608 A CN 201911359608A CN 113036339 A CN113036339 A CN 113036339A
- Authority
- CN
- China
- Prior art keywords
- filter
- cavity
- filtering
- branch
- filtering cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Filters And Equalizers (AREA)
Abstract
The application discloses a communication system and a filter thereof. The filter comprises a first filtering branch and a second filtering branch, wherein the first filtering branch consists of ten filtering cavities which are sequentially coupled, and the first filtering cavity and the third filtering cavity of the first filtering branch and the fifth filtering cavity and the seventh filtering cavity of the first filtering branch are respectively cross-coupled to form two first capacitive cross-coupling zeros; the third filtering cavity and the fifth filtering cavity of the first filtering branch circuit and the seventh filtering cavity and the ninth filtering cavity of the first filtering branch circuit are respectively in cross coupling to form two first inductive cross coupling zero points; the first to tenth filter cavities of the first filter branch are divided into two rows arranged along the first direction, wherein the distance between the center of the nth filter cavity and the center of the (n + 2) th filter cavity of the first filter branch is a preset fixed value, and n is an integer greater than or equal to 1 and less than or equal to 8. By means of the mode, the filter can be produced through the same die, cost is reduced, and stability is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication system and a filter thereof.
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.
The inventor of the application discovers that the existing irregular design of the cavity of the filter needs a plurality of sets of dies for production and the consistency of materials is poor in a long-term research and development process.
Disclosure of Invention
In order to solve the above problems of the prior art filter, the present application provides a communication system and a filter thereof.
To solve the above problem, an embodiment of the present application provides a filter, including: 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, and the first filtering cavity and the third filtering cavity and the fifth filtering cavity and the seventh filtering cavity of the first filtering branch are respectively cross-coupled to form two first capacitive cross-coupling zero points; the third filtering cavity and the fifth filtering cavity of the first filtering branch circuit and the seventh filtering cavity and the ninth filtering cavity of the first filtering branch circuit are respectively in cross coupling to form two first inductive cross coupling zeros; the first to tenth filter cavities of the first filter branch are divided into two rows arranged along the first direction, wherein the distance between the center of the nth filter cavity and the center of the (n + 2) th filter cavity of the first filter branch is a preset fixed value, and n is an integer greater than or equal to 1 and less than or equal to 8.
The first filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the ninth filtering cavity of the first filtering branch are in a row and are sequentially arranged at intervals along the second direction; the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially arranged at intervals along the second direction. The cavity space can be fully utilized due to regular distribution, and miniaturization of the filter is facilitated.
The second filter cavity of the first filter branch is further respectively and adjacently arranged with the first filter cavity and the third filter cavity of the first filter branch, the fifth filter cavity of the first filter branch is further respectively and adjacently arranged with the fourth filter cavity and the sixth filter cavity of the first filter branch, and the eighth filter cavity of the first filter branch is further respectively and adjacently arranged with the seventh filter cavity and the ninth filter cavity of the first filter branch. Through adjacent setting for the filtering chamber is arranged more closely, reduces the volume of wave filter.
Wherein, the bandwidth range of the first filtering branch is 2512-2678 MHz. The bandwidth meets the design requirements.
The filter also comprises a second filtering branch, the second filtering branch and the first filtering branch are arranged adjacently and have the same structure, the second filtering branch is composed of ten filtering cavities which are coupled in sequence, cross coupling is respectively carried out between a tenth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and a fourth filtering cavity of the second filtering branch so as to form two second capacitive cross coupling zero points, cross coupling is respectively carried out between the eighth filtering cavity and the sixth filtering cavity and between the fourth filtering cavity and the second filtering cavity of the second filtering branch so as to form two second inductive cross coupling zero points, and the first filtering cavity to the tenth filtering cavity of the second filtering branch are divided into two rows arranged along the first direction. The first filtering branch circuit and the second filtering branch circuit are identical in structure, a plurality of filters can be produced by using the same die, and the second filtering branch circuit is arranged regularly and is arranged adjacent to the first filtering branch circuit, so that the size of the filter is reduced.
The first filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the ninth filtering cavity of the second filtering branch are in a row and are sequentially arranged at intervals along the second direction; the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the second filtering branch are in a row and are sequentially arranged at intervals along the second direction. The arrangement is regular, the volume of the cavity is reduced, and the design and debugging are facilitated.
The third filter cavity of the second filter branch is respectively adjacent to the second filter cavity and the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch is respectively adjacent to the seventh filter cavity and the fifth filter cavity of the second filter branch, and the ninth filter cavity of the second filter branch is adjacent to the eighth filter cavity and the tenth filter cavity of the second filter branch. The filter cavities of the second filter branch are arranged more closely, and the size of the filter is reduced.
The eighth filter cavity of the first filter branch is respectively adjacent to the ninth filter cavity and the seventh filter cavity of the second filter branch, and the fourth filter cavity of the first filter branch is respectively adjacent to the fifth filter cavity and the third filter cavity of the second filter branch. The first filtering cavity and the second filtering cavity are arranged adjacently, so that the filtering cavities of the filter are arranged more closely, and the miniaturization of the filter is facilitated.
Wherein, the bandwidth range of the second filtering branch is 2512-2678 MHz. The bandwidth meets the design requirements.
In order to solve the above problem, an embodiment of the present application provides a communication device, where the communication device includes an antenna and a radio frequency unit connected to the antenna, and the radio frequency unit includes the filter of any of the above embodiments, and is configured to filter a radio frequency signal.
Different from the situation of the prior art, the filter comprises a first filtering branch, wherein the first filtering branch consists of ten filtering cavities which are sequentially coupled, and the first filtering cavity and the third filtering cavity, and the fifth filtering cavity and the seventh filtering cavity of the first filtering branch are respectively cross-coupled to form two first capacitive cross-coupling zeros; the third filtering cavity and the fifth filtering cavity of the first filtering branch circuit and the seventh filtering cavity and the ninth filtering cavity of the first filtering branch circuit are respectively in cross coupling to form two first inductive cross coupling zero points so as to realize zero point suppression, so that the debugging index is convenient, the setting of the coupling zero points can play a role in suppressing signals outside a pass band, and the suppression performance of the first filtering branch circuit is improved. Wherein, these ten filter chambers divide into two rows of arranging along first direction, and the equidistant interval in filter chamber in every row sets up, and filter chamber regular distribution can produce a plurality of wave filters through same mould, reduce cost, and stability is high.
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 a first embodiment of a filter according to the present application;
FIG. 2 is a schematic of the topology of the filter of FIG. 1;
FIG. 3 is a diagram showing simulation results of the filter of FIG. 1;
FIG. 4 is a schematic diagram of the structure of a second embodiment of the filter of the present application;
FIG. 5 is a schematic diagram of the topology of the second filtering branch of FIG. 4;
fig. 6 is a schematic structural diagram of an embodiment of the communication system of 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.
The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11 and a first filter branch 121; the first filtering branch 121 may be a receiving filtering branch or a transmitting filtering branch.
The housing 11 has a first direction L and a second direction D, and the first direction L of the housing 11 is perpendicular to the second direction D of the housing 11. The first filtering branch 121 is disposed on the housing 11, and is composed of ten filtering cavities 122 coupled in sequence, and two first capacitive cross-coupling zeros 131 and two first inductive cross-coupling zeros 132 are formed, so that zero suppression can be achieved, and index debugging is facilitated.
The ten filter cavities 122 of the first filter branch 121 are specifically the first filter cavity a1 to the tenth filter cavity a10 of the first filter branch 121, and are divided into two rows arranged along the first direction L, a distance between a center of the nth filter cavity of the first filter branch 121 and a center of the (n + 2) th filter cavity is a preset fixed value, and n is an integer greater than or equal to 1 and less than or equal to 8. By the equidistant arrangement, the space of the cavity can be fully utilized, the size of the filter 10 is reduced, the first inductive cross-coupling zero point 132 is convenient to set, and the suppression performance of the first filtering branch 121 is improved when the bandwidth of the first filtering branch 121 is within the range of 2512MHZ-2678 MHz.
Specifically, the first filtering cavity a1 of the first filtering branch 121, the third filtering cavity A3 of the first filtering branch 121, the fifth filtering cavity a5 of the first filtering branch 121, the seventh filtering cavity a7 of the first filtering branch 121, and the ninth filtering cavity a9 of the first filtering branch 121 are in a row and are sequentially arranged at intervals along the second direction D; the second filtering cavity a2 of the first filtering branch 121, the fourth filtering cavity a4 of the first filtering branch 121, the sixth filtering cavity a6 of the first filtering branch 121, the eighth filtering cavity A8 of the first filtering branch 121, and the tenth filtering cavity a10 of the first filtering branch 121 are in a row and are sequentially arranged at intervals along the second direction. Namely, the ten filter cavities 122 in the first filter branch 121 are regularly distributed, so that the size of the filter 10 is reduced, and a plurality of filters 10 can be produced by the same mold, thereby reducing the production cost.
Further, the second filter cavity a2 of the first filter branch 121 is further disposed adjacent to the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121, the fifth filter cavity a5 of the first filter branch 121 is further disposed adjacent to the fourth filter cavity a4 of the first filter branch 121 and the sixth filter cavity a6 of the first filter branch 121, and the eighth filter cavity A8 of the first filter branch 121 is further disposed adjacent to the seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121. Such an adjacent arrangement can reduce the size of the filter 10, which is advantageous for downsizing the filter 10.
Referring to fig. 1 and 2, the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121, and the fifth filter cavity a5 of the first filter branch 121 and the seventh filter cavity a7 of the first filter branch 121 are respectively cross-coupled to form two first capacitive cross-coupling zeros 131; the third filter cavity A3 of the first filter branch 121 and the fifth filter cavity a5 of the first filter branch 121, and the seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121 are cross-coupled to form two first inductive cross-coupling zeros 132, respectively.
Specifically, a capacitive cross coupling may be provided between the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121, a window (not shown) may be provided between the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121, and a capacitive fly bar (not shown) may be provided between the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121, so that the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121 are capacitively cross coupled, which is equivalent to the capacitor c1 shown in fig. 2. A window (not shown) may be disposed between the fifth filtering cavity A5 of the first filtering branch 121 and the seventh filtering cavity a7 of the first filtering branch 121, and a capacitive flying bar (not shown) may be disposed between the fifth filtering cavity A5 of the first filtering branch 121 and the seventh filtering cavity a7 of the first filtering branch 121, so that the fifth filtering cavity A5 of the first filtering branch 121 and the seventh filtering cavity a7 of the first filtering branch 121 are capacitively cross-coupled, which is equivalent to the capacitor c2 shown in fig. 2. In this application, the distance from the first filtering cavity a1 to the third filtering cavity A3 of the first filtering branch 121 is equal to the distance from the fifth filtering cavity a5 to the seventh filtering cavity a7 of the first filtering branch 121, so that the flying rod element with the same specification can be adopted to achieve the effect of realizing two capacitive coupling zeros. When the first filtering branch 121 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.
The third filtering cavity A3 of the first filtering branch 121 and the fifth filtering cavity a5 of the first filtering branch 121 are inductively cross-coupled, a window may be disposed between the third filtering cavity A3 of the first filtering branch 121 and the fifth filtering cavity a5 of the first filtering branch 121, and a metal coupling rib may be disposed on the window, so that the third filtering cavity A3 of the first filtering branch 121 and the fifth filtering cavity a5 of the first filtering branch 121 implement inductive cross-coupling, which is equivalent to the inductance L1 shown in fig. 2. The seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121 are inductively cross-coupled, a window may be disposed between the seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121, and a metal coupling rib may be disposed on the window, so that the seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121 implement inductive cross-coupling, which is equivalent to the inductor L2 shown in fig. 2. In this application, the distance from the third filtering cavity A3 to the third filtering cavity a5 of the first filtering branch 121 is equal to the distance from the seventh filtering cavity a7 to the seventh filtering cavity a9 of the first filtering branch 121, so that the metal coupling ribs with the same specification can be adopted to achieve the effect of realizing two inductive coupling zeros. When the first filtering branch 121 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index.
The size of the first filter cavity a1 of the first filter branch 121, the size of the second filter cavity a2 of the first filter branch 121, the size of the third filter cavity A3 of the first filter branch 121, the size of the fourth filter cavity a4 of the first filter branch 121, the size of the fifth filter cavity a5 of the first filter branch 121, the size of the sixth filter cavity a6 of the first filter branch 121, the size of the seventh filter cavity a7 of the first filter branch 121, the size of the eighth filter cavity A8 of the first filter branch 121, the size of the ninth filter cavity a9 of the first filter branch 121, and the size of the tenth filter cavity a10 of the first filter branch 121 may be the same, so as to facilitate layout and debugging, and improve the consistency of the filter 10.
Optionally, the housing 11 is further provided with a first port (not shown) and a second port (not shown), the first filter cavity a1 of the first filter branch 121 is connected to the first port of the first filter branch 121, and the tenth filter cavity a10 of the first filter branch 121 is connected to the second port of the first filter branch 121. Wherein the first port and the second port may both be taps of the filter 10.
The bandwidth of the first filtering branch 121 is in the range 2512MHZ-2678 MHZ. In particular, the coupling bandwidth between the first filter cavity a1 of the first filter branch 121 and the second filter cavity a2 of the first filter branch 121 ranges from 106Mhz to 122 Mhz; the coupling bandwidth between the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121 ranges from (-78) Mhz- (-66) Mhz; the coupling bandwidth between the second filter cavity a2 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121 ranges from 66Mhz to 78 Mhz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 121 and the fourth filter cavity a4 of the first filter branch 121 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the third filter cavity A3 of the first filter branch 121 and the fifth filter cavity a5 of the first filter branch 121 ranges from 57Mhz to 68 Mhz; the coupling bandwidth between the fourth filter cavity a4 of the first filter branch 121 and the fifth filter cavity a5 of the first filter branch 121 ranges from 47Mhz to 56 Mhz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 121 and the sixth filter cavity a6 of the first filter branch 121 ranges from 51Mhz to 61 Mhz; the coupling bandwidth between the fifth filter cavity a5 of the first filter branch 121 and the seventh filter cavity a7 of the first filter branch 121 ranges from (-64) Mhz- (-54) Mhz; the coupling bandwidth between the sixth first filter cavity a6 of the first filter branch 121 and the seventh filter cavity a7 of the first filter branch 121 ranges from 53Mhz to 63 Mhz; the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 121 and the eighth filter cavity A8 of the first filter branch 121 ranges from 69Mhz to 81 Mhz; the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121 ranges from (-46) Mhz- (-37) Mhz; the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 121 and the ninth filter cavity a9 of the first filter branch 121 is in the range (-90) Mhz- (-77) Mhz, and the coupling bandwidth between the ninth filter cavity a9 of the first filter branch 121 and the tenth filter cavity a10 of the first filter branch 121 is in the range 126Mhz-144 Mhz. Therefore, the bandwidth of the filter 10 of the present embodiment is in the range of 2512MHZ-2678MHZ, which can meet the design requirement.
The resonant frequencies of the first filter cavity a1 to the tenth filter cavity a10 are in the following ranges in order: 2593MHz to 2595MHz, 2542MHz to 2544MHz, 2600MHz to 2602MHz, 2659MHz to 2661MHz, 2593MHz to 2595MHz, 2532MHz to 2534MHz, 2590 MHz to 2592MHz, 2633MHz to 2635MHz, 2593MHz to 2595MHz, and 2593MHz to 2595 MHz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.
As shown in fig. 3, fig. 3 is a diagram illustrating simulation results of the filter 10 in fig. 1. Through experimental tests, the bandwidth of the filter 10 of the present application is in the range of 2512MHZ-2678MHZ, as shown by the band curve 20 in fig. 3. Wherein the bandwidth suppression satisfies: 2400MHz is more than 65dB, 2500MHz is more than 40dB, 2505MHz is more than 20dB, 2685MHz is more than 20dB, 2700MHz is more than 45dB, therefore the performances of the filter 10 such as out-of-band rejection can be improved.
Different from the situation in the prior art, the first filtering branch 121 of the filter 10 of this embodiment is composed of ten filtering cavities 122 coupled in sequence, and the ten filtering cavities 122 of the first filtering branch 121 further form two first inductive cross-coupling zeros and two first capacitive cross-coupling zeros, so that zero suppression can be realized, and the index can be conveniently debugged; in the embodiment, the filter cavities 122 in each row in the first filter branch 121 are distributed at equal intervals, and the filter cavities are regularly distributed, so that the product complexity is reduced, and the stability of the filter 10 is improved; in addition, the filter 10 of the present embodiment can produce a plurality of filters 10 by the same mold, which improves the production efficiency, reduces the cost, and has high stability.
The present application provides a filter 10 of a second embodiment, which is described on the basis of the filter 10 disclosed in the first embodiment. As shown in fig. 4, the filter 10 of the present embodiment further includes: the second filtering branch 123 is disposed adjacent to the first filtering branch 121, the second filtering branch 123 is composed of ten filtering cavities 124 coupled in sequence, and the ten filtering cavities 124 of the second filtering branch 123 form two second capacitive cross-coupling zeros 133 and two second inductive cross-coupling zeros 134. The ten filter cavities 124 in the second filter branch 123 are specifically the first filter cavity B1 through the tenth filter cavity B10 of the second filter branch 123, and are divided into two rows arranged along the first direction L, and the structure of the first filter branch 121 and the structure of the second filter branch 123 may be the same. In this embodiment, the filter cavities are regularly distributed, and a plurality of filters 10 can be produced by the same mold, so that the cost is reduced and the stability is high.
Specifically, the first filtering cavity B1 of the second filtering branch 123, the third filtering cavity B3 of the second filtering branch 123, the fifth filtering cavity B5 of the second filtering branch 123, the seventh filtering cavity B7 of the second filtering branch 123, and the ninth filtering cavity B9 of the second filtering branch 123 are in a row and are sequentially arranged at intervals along the second direction D; the second filtering cavity B2 of the second filtering branch 123, the fourth filtering cavity B4 of the second filtering branch 123, the sixth filtering cavity B6 of the second filtering branch 123, the eighth filtering cavity B8 of the second filtering branch 123, and the tenth filtering cavity B10 of the second filtering branch 123 are in a row and are sequentially arranged at intervals along the second direction D. The third filtering cavity B3 of the second filtering branch 123 is respectively adjacent to the second filtering cavity B2 of the second filtering branch 123 and the fourth filtering cavity B4 of the second filtering branch 123, the sixth filtering cavity B6 of the second filtering branch 123 is respectively adjacent to the seventh filtering cavity B7 of the second filtering branch 123 and the fifth filtering cavity B5 of the second filtering branch 123, and the ninth filtering cavity B9 of the second filtering branch 123 is adjacent to the eighth filtering cavity B8 of the second filtering branch 123 and the tenth filtering cavity B10 of the second filtering branch 123. The filter 10 is provided with the cavities in the regular arrangement mode, so that the cost can be saved, the material consistency is good, and the stability is high.
Further, the eighth filtering cavity A8 of the first filtering branch 121 is respectively disposed adjacent to the ninth filtering cavity B9 of the second filtering branch 123 and the seventh filtering cavity B7 of the second filtering branch 123, and the fourth filtering cavity a4 of the first filtering branch 121 is respectively disposed adjacent to the fifth filtering cavity B5 of the second filtering branch 123 and the third filtering cavity B3 of the second filtering branch 123. Such an adjacent arrangement can reduce the size of the filter 10, which is advantageous for downsizing the filter 10.
As shown in fig. 5, the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123, and the sixth filter cavity B6 of the second filter branch 123 and the fourth filter cavity B4 of the second filter branch 123 are respectively cross-coupled to form two second capacitive cross-coupling zeros 133; the eighth filtering cavity B8 of the second filtering branch 123 and the sixth filtering cavity B6 of the second filtering branch 123, and the fourth filtering cavity B4 of the second filtering branch 123 and the second filtering cavity B2 of the second filtering branch 123 are respectively cross-coupled to form two second inductive cross-coupling zeros 134.
Specifically, a capacitive cross coupling may be provided between the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123, a window (not shown) may be provided between the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123, and a capacitive fly rod (not shown) may be provided between the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123, so that the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity a8 of the second filter branch 123 are capacitively cross coupled, which is equivalent to the capacitor c3 shown in fig. 5. A window (not shown) may be disposed between the sixth filtering cavity B6 of the second filtering branch 123 and the fourth filtering cavity B4 of the second filtering branch 123, and a capacitive flying bar (not shown) may be disposed between the sixth filtering cavity B6 of the second filtering branch 123 and the fourth filtering cavity B4 of the second filtering branch 123, so that the sixth filtering cavity B6 of the second filtering branch 123 and the fourth filtering cavity a4 of the second filtering branch 123 are capacitively cross-coupled, which is equivalent to the capacitor c4 shown in fig. 5. The eighth filter cavity B8 of the second filter branch 123 and the sixth filter cavity B6 of the second filter branch 123 are inductively cross-coupled, a window may be disposed between the eighth filter cavity B8 of the second filter branch 123 and the sixth filter cavity B6 of the second filter branch 123, and a metal coupling rib may be disposed on the window, so that the eighth filter cavity B8 of the second filter branch 123 and the sixth filter cavity B6 of the second filter branch 123 implement inductive cross-coupling, which is equivalent to the inductor L3 shown in fig. 5. The fourth filtering cavity B4 of the second filtering branch 123 and the second filtering cavity B2 of the second filtering branch 123 are inductively cross-coupled, a window may be disposed between the fourth filtering cavity B4 of the second filtering branch 123 and the second filtering cavity B2 of the second filtering branch 123, and a metal coupling rib may be disposed on the window, so that the fourth filtering cavity B4 of the second filtering branch 123 and the second filtering cavity B2 of the second filtering branch 123 implement inductive cross-coupling, which is equivalent to the inductance L4 shown in fig. 5. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index.
The size of the first filtering cavity a1 of the first filtering branch 121 to the size of the tenth filtering cavity a10, and the size of the tenth filtering cavity B10 of the second filtering branch 123 to the size of the first filtering cavity B1 may be the same, so as to facilitate layout and debugging, and improve the consistency of the filter 10.
Optionally, a third port (not shown) and a fourth port (not shown) are further disposed on the housing 11, the tenth filtering cavity B10 of the second filtering branch 123 is connected to the third port, and the first filtering cavity B1 of the second filtering branch 123 is connected to the fourth port. Wherein, the third port and the fourth port can be taps of the filter 10.
The bandwidth of the second filtering branch 123 is in the range of 2512MHZ-2678 MHZ. In particular, the coupling bandwidth between the tenth filter cavity B10 of the second filter branch 123 and the ninth filter cavity B9 of the second filter branch 123 ranges from 106Mhz to 122 Mhz; the coupling bandwidth between the tenth filter cavity B10 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123 ranges from (-78) Mhz- (-66) Mhz; the coupling bandwidth between the ninth filter cavity B9 of the second filter branch 123 and the eighth filter cavity B8 of the second filter branch 123 ranges from 66Mhz to 78 Mhz; the coupling bandwidth between the eighth filter cavity B8 of the second filter branch 123 and the seventh filter cavity B7 of the second filter branch 123 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the eighth filter cavity B8 of the second filter branch 123 and the sixth filter cavity B6 of the second filter branch 123 ranges from 57Mhz to 68 Mhz; the coupling bandwidth between the seventh filter cavity B7 of the second filter branch 123 and the sixth filter cavity B6 of the second filter branch 123 ranges from 47Mhz to 56 Mhz; the coupling bandwidth between the sixth filter cavity B6 of the second filter branch 123 and the fifth filter cavity B5 of the second filter branch 123 ranges from 51Mhz to 61 Mhz; the coupling bandwidth between the sixth filter cavity B6 of the second filter branch 123 and the fourth filter cavity B4 of the second filter branch 123 ranges from (-64) Mhz- (-54) Mhz; the coupling bandwidth between the sixth first filter cavity of the second filter branch 123 and the fourth filter cavity B4 of the second filter branch 123 ranges from 53Mhz to 63 Mhz; the coupling bandwidth between the fourth filter cavity B4 of the second filter branch 123 and the third filter cavity B3 of the second filter branch 123 ranges from 69Mhz-81 Mhz; the coupling bandwidth between the fourth filter cavity B4 of the second filter branch 123 and the second filter cavity B2 of the second filter branch 123 ranges from (-46) Mhz- (-37) Mhz; the coupling bandwidth between the third filter cavity B3 of the second filter branch 123 and the second filter cavity B2 of the second filter branch 123 ranges from (-90) Mhz- (-77) Mhz, and the coupling bandwidth between the second filter cavity B2 of the second filter branch 123 and the first filter cavity B1 of the second filter branch 123 ranges from 126Mhz-144 Mhz. Therefore, the bandwidth of the second filtering branch 123 of the present embodiment is located at 2512MHZ-2678MHZ, which can meet the design requirement.
The resonant frequencies of the tenth filter cavity B10 through the first filter cavity B1 of the second filter branch 123 are sequentially in the following ranges: 2593MHz to 2595MHz, 2542MHz to 2544MHz, 2600MHz to 2602MHz, 2659MHz to 2661MHz, 2593MHz to 2595MHz, 2532MHz to 2534MHz, 2590 MHz to 2592MHz, 2633MHz to 2635MHz, 2593MHz to 2595MHz, and 2593MHz to 2595 MHz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process. The simulation result of the second filtering branch 123 is the same as the frequency band curve 20 shown in fig. 3, and is not described herein again.
The filter 10 of this embodiment is provided with two filtering branches, and the row's chamber of first filtering branch 121, second filtering branch 123 is arranged at interval in proper order, can make full use of filter 10's space, and convenient production, reduction in production cost.
The present application further provides a communication system, as shown in fig. 6, fig. 6 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 62 and a radio frequency unit 61 connected to the antenna 62, where the radio frequency unit 61 includes the filter 10 of any one of the above embodiments, and the filter 10 is configured to filter a radio frequency signal. In other embodiments, the rf Unit 61 may be integrated with the Antenna 62 to form an Active Antenna Unit (AAU). For the structure of the filter 10, please refer to fig. 1-5 and the related text descriptions, which are not repeated herein.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (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 sequentially coupled, and the first filtering cavity and the third filtering cavity of the first filtering branch and the fifth filtering cavity and the seventh filtering cavity of the first filtering branch are respectively in cross coupling to form two first capacitive cross coupling zero points;
the third filtering cavity and the fifth filtering cavity of the first filtering branch circuit and the seventh filtering cavity and the ninth filtering cavity of the first filtering branch circuit are respectively in cross coupling to form two first inductive cross coupling zeros;
the first filtering cavity to the tenth filtering cavity of the first filtering branch circuit are divided into two rows arranged along the first direction, wherein the distance between the center of the nth filtering cavity and the center of the (n + 2) th filtering cavity of the first filtering branch circuit is a preset fixed value, and n is an integer greater than or equal to 1 and less than or equal to 8.
2. The filter according to claim 1, wherein the first, third, fifth, seventh and ninth filter cavities of the first filter branch are in a row and are sequentially arranged at intervals along the second direction;
and the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially arranged at intervals along the second direction.
3. The filter according to claim 2, wherein the second filter cavity of the first filter branch is further disposed adjacent to the first filter cavity and the third filter cavity of the first filter branch, respectively, the fifth filter cavity of the first filter branch is further disposed adjacent to the fourth filter cavity and the sixth filter cavity of the first filter branch, respectively, and the eighth filter cavity of the first filter branch is further disposed adjacent to the seventh filter cavity and the ninth filter cavity of the first filter branch, respectively.
4. The filter of claim 3 wherein the bandwidth of the first filtering branch is 2512-2678 MHz.
5. The filter according to any one of claims 1 to 4, further comprising a second filtering branch, the second filtering branch is disposed adjacent to the first filtering branch and has the same structure, the second filtering branch is composed of ten filtering cavities coupled in sequence, the tenth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the fourth filtering cavity of the second filtering branch are respectively cross-coupled to form two second capacitive cross-coupling zeros, the eighth filtering cavity and the sixth filtering cavity, and the fourth filtering cavity and the second filtering cavity of the second filtering branch are respectively cross-coupled to form two second inductive cross-coupling zeros, and the first filtering cavity to the tenth filtering cavity of the second filtering branch are divided into two columns arranged along the first direction.
6. The filter according to claim 5, wherein the first filter cavity, the third filter cavity, the fifth filter cavity, the seventh filter cavity and the ninth filter cavity of the second filter branch are in a row and are sequentially arranged at intervals along the second direction;
and the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the second filtering branch are in a row and are sequentially arranged at intervals along the second direction.
7. The filter according to claim 6, wherein the third filter cavity of the second filter branch is respectively disposed adjacent to the second filter cavity and the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch is respectively disposed adjacent to the seventh filter cavity and the fifth filter cavity of the second filter branch, and the ninth filter cavity of the second filter branch is disposed adjacent to the eighth filter cavity and the tenth filter cavity of the second filter branch.
8. The filter according to claim 7, wherein the eighth filter cavity of the first filter branch is disposed adjacent to the ninth filter cavity and the seventh filter cavity of the second filter branch, respectively, and the fourth filter cavity of the first filter branch is disposed adjacent to the fifth filter cavity and the third filter cavity of the second filter branch, respectively.
9. The filter of claim 8 wherein the bandwidth of the second filtering branch is 2512-2678 MHz.
10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911359608.2A CN113036339A (en) | 2019-12-25 | 2019-12-25 | Communication system and filter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911359608.2A CN113036339A (en) | 2019-12-25 | 2019-12-25 | Communication system and filter thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113036339A true CN113036339A (en) | 2021-06-25 |
Family
ID=76458944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911359608.2A Pending CN113036339A (en) | 2019-12-25 | 2019-12-25 | Communication system and filter thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036339A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1194160A (en) * | 1984-05-28 | 1985-09-24 | Wai-Cheung Tang | Planar dielectric resonator dual-mode filter |
| EP1465283A1 (en) * | 2003-04-04 | 2004-10-06 | Alcatel | Dielectric resonator filter |
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN200997430Y (en) * | 2006-12-31 | 2007-12-26 | 摩比天线技术（深圳）有限公司 | Sensitive coupling structure between coaxial cavity resonater and filter therewith |
| CN209357889U (en) * | 2018-12-29 | 2019-09-06 | 深圳市大富科技股份有限公司 | Cavity body filter, duplexer and radio-frequency devices |
| CN209691910U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of filter, duplexer and communication equipment |
-
2019
- 2019-12-25 CN CN201911359608.2A patent/CN113036339A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1194160A (en) * | 1984-05-28 | 1985-09-24 | Wai-Cheung Tang | Planar dielectric resonator dual-mode filter |
| EP1465283A1 (en) * | 2003-04-04 | 2004-10-06 | Alcatel | Dielectric resonator filter |
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN200997430Y (en) * | 2006-12-31 | 2007-12-26 | 摩比天线技术（深圳）有限公司 | Sensitive coupling structure between coaxial cavity resonater and filter therewith |
| CN209357889U (en) * | 2018-12-29 | 2019-09-06 | 深圳市大富科技股份有限公司 | Cavity body filter, duplexer and radio-frequency devices |
| CN209691910U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of filter, duplexer and communication equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211719756U (en) | Filter and communication equipment | |
| CN211125982U (en) | Communication device and filter thereof | |
| CN211125985U (en) | Filter and communication equipment | |
| CN113036339A (en) | Communication system and filter thereof | |
| CN211125965U (en) | Filter and communication equipment | |
| CN211125976U (en) | Filter and communication equipment | |
| CN211125967U (en) | Filter and communication equipment | |
| CN211125977U (en) | Filter and communication equipment | |
| CN211125981U (en) | Filter and communication equipment | |
| CN211125978U (en) | Filter and communication equipment | |
| CN211125966U (en) | Filter and communication equipment | |
| CN113131120A (en) | Communication device and filter thereof | |
| CN113036351A (en) | Communication device and filter thereof | |
| CN113054376A (en) | Filter and communication equipment | |
| CN113036343A (en) | Communication equipment and filter thereof | |
| CN113054336A (en) | Communication device and filter thereof | |
| CN113054343A (en) | Communication device and filter | |
| CN113036350A (en) | Communication device and filter thereof | |
| CN113131128A (en) | Communication device and filter thereof | |
| CN113054385A (en) | Communication equipment and filter | |
| CN113131153A (en) | Filter and communication equipment | |
| CN113036340A (en) | Communication device and filter thereof | |
| CN113054341A (en) | Communication device and filter thereof | |
| CN113036363A (en) | Communication equipment and filter | |
| CN113675562A (en) | Filter and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210625 |
|
| RJ01 | Rejection of invention patent application after publication |