CN113036365A - Communication device and filter thereof - Google Patents
Communication device and filter thereof Download PDFInfo
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- CN113036365A CN113036365A CN201911361399.5A CN201911361399A CN113036365A CN 113036365 A CN113036365 A CN 113036365A CN 201911361399 A CN201911361399 A CN 201911361399A CN 113036365 A CN113036365 A CN 113036365A
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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
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Abstract
The application discloses a communication device and a filter thereof, wherein the filter comprises a shell, a first side and a second side, wherein the first side and the second side are perpendicular to each other; the first filtering branch is arranged on the shell, consists of five filtering cavities which are sequentially coupled, and forms two first capacitive cross-coupling zeros; the distance between any two adjacent filter cavities in the first filter branch is equal, and the five filter cavities of the first filter branch are in trapezoidal arrangement. By the mode, the filter can reduce the complexity of a product and improve the stability of the filter; the filter cavities of the first filter branch circuit are arranged regularly, so that the layout and miniaturization are facilitated.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication device 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 finds that capacitive cross coupling and inductive cross coupling are simultaneously arranged in the same branch of the existing filter in long-term research and development work, and the capacitive cross coupling and the inductive cross coupling are different in material, so that the filter is high in product complexity due to multiple types of required materials.
Disclosure of Invention
The present application provides a communication device and a filter thereof to solve the above problems in the prior art.
In order to solve the above technical problem, 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, consists of five filtering cavities which are sequentially coupled, and forms two first capacitive cross-coupling zeros;
the distance between any two adjacent filter cavities in the first filter branch is equal, and the five filter cavities of the first filter branch are in trapezoidal arrangement.
In order to solve the above technical problem, the present application provides a communication device, the communication device includes an antenna and a radio frequency unit connected to the antenna, the radio frequency unit includes the above filter, and the filter is used for filtering the radio frequency signal.
The filter comprises a first filtering branch arranged on a shell, a second filtering branch and a third filtering branch, wherein the first filtering branch consists of five filtering cavities which are sequentially coupled and forms two first capacitive cross-coupling zeros; the distance between any two adjacent filter cavities in the first filter branch is equal, and the five filter cavities of the first filter branch are in trapezoidal arrangement. Through the mode, the first filtering branch circuit is in pure capacitive coupling, so that the product complexity can be reduced, and the stability of the filter is improved; five filter chambers of first filtering branch road are trapezoidal setting, and the distance between the adjacent filter chamber is equal, and the filter chamber is arranged regularly compactly, does benefit to overall arrangement and miniaturization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a filter according to the present application;
FIG. 2 is a schematic diagram of a topology of a first filtering branch of a filter according to the present application;
FIG. 3 is a schematic diagram of another embodiment of the filter of the present application;
FIG. 4 is a schematic diagram of a filter according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a topology of a third filtering branch of the filter of the present application;
FIG. 6 is a diagram illustrating simulation results of a first filtering branch of the filter according to the present application;
FIG. 7 is a diagram illustrating simulation results of a third filtering branch of the filter according to the present application;
fig. 8 is a schematic structural diagram of an embodiment of the communication device of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present application, a communication device and a filter thereof provided by the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a filter according to the present application. The filter 10 of the present embodiment includes a housing 11 and a first filtering branch 12, and the first filtering branch 12 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 12 is arranged on the housing 11, is composed of five filtering cavities 121 coupled in sequence, and further forms two first capacitive cross-coupling zeros 122, so that zero suppression can be realized, and indexes can be conveniently debugged; the first filtering branch 12 is purely capacitively coupled, so that the material consistency is good, the cost is low, and the stability is high; five filter cavities 121 of the first filter branch 12 are in a trapezoid shape, the distance between any two adjacent filter cavities in the first filter branch 12 is equal, the arrangement rule of the filter cavities is compact, and the layout and miniaturization are facilitated.
In particular, the first filtering branch 12 comprises a first filtering chamber a11 through a fifth filtering chamber a 15. The five filter cavities 121 of the first filter branch 12 are divided into two rows arranged along the second direction D, and the fifth filter cavity a15, the fourth filter cavity a14 and the third filter cavity a13 of the first filter branch 12 are in one row and are sequentially arranged along the first direction L; the first filter cavity a11 and the second filter cavity a12 of the first filter branch 12 are in a row and are sequentially arranged along the first direction L.
The fourth filtering cavity a14 of the first filtering branch 12 is further disposed adjacent to the fifth filtering cavity a15, the first filtering cavity a11, the second filtering cavity a12 and the third filtering cavity a13 of the first filtering branch 12, respectively.
The five filter cavities 121 of the first filter branch 12 are arranged in a trapezoid, as shown in fig. 1, a connecting line between the center of the first filter cavity a11 and the center of the second filter cavity a12 is an upper bottom of the trapezoid, a connecting line between the center of the fifth filter cavity a15, the center of the fourth filter cavity a14 and the center of the third filter cavity a13 is a lower bottom of the trapezoid, a connecting line between the center of the first filter cavity a11 and the center of the fifth filter cavity a15 is a waist of the trapezoid, and a connecting line between the center of the second filter cavity a12 and the center of the third filter cavity a13 is a waist of the trapezoid, because the distance between the center of the first filter cavity a11 and the center of the fifth filter cavity a15 is equal to the distance between the center of the second filter cavity a12 and the center of the third filter cavity a13, the trapezoid formed by the five filter cavities 121 is a trapezoid, and the five filter cavities 121 of the filter 10 are regularly distributed and compactly arranged, thereby reducing the volume and reducing the cost of the filter 10.
As shown in fig. 2, fig. 2 is a schematic diagram of a topology of a first filtering branch of the filter of the present application. The capacitive cross coupling between the first filter cavity a11 and the fourth filter cavity a14 of the first filter branch 12 and between the second filter cavity a12 and the fourth filter cavity a14 of the first filter branch 12, respectively, forms two first capacitive cross-coupling zeros 122.
Specifically, a window may be disposed between the first filter cavity a11 and the fourth filter cavity a14 of the first filter branch 12, so as to implement capacitive cross coupling between the first filter cavity a11 and the fourth filter cavity a14, and form a capacitive cross coupling zero, which is equivalent to the capacitor C1 shown in fig. 2.
A window may be disposed between the second filter cavity a12 and the fourth filter cavity a14 of the first filter branch 12, so that capacitive cross coupling is achieved between the second filter cavity a12 and the fourth filter cavity a14, and a capacitive cross coupling zero is formed, which is equivalent to the capacitor C2 shown in fig. 2.
In some embodiments, capacitive zero coupling may also be achieved by providing capacitive cross-coupling elements. The capacitive cross-coupling element may be a flying bar, i.e. a flying bar is arranged between the first filter chamber a11 and the fourth filter chamber a14 and a flying bar is arranged between the second filter chamber a12 and the fourth filter chamber a 14. Because the distance between the first filter cavity A11 and the fourth filter cavity A14 is equal to the distance between the second filter cavity A12 and the fourth filter cavity A14, the flying rod elements with the same specification can be adopted to achieve the effect of realizing two first capacitive coupling zero points 122, so that the debugging indexes are facilitated, and the designed filter meets the parameter requirements; when the first filtering branch 12 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.
The size of the first filter cavity a11, the size of the second filter cavity a12, the size of the third filter cavity a13, the size of the fourth filter cavity a14, and the size of the fifth filter cavity a15 of the first filter branch 12 are the same, that is, any two adjacent filter cavities in the first filter branch 12 may be distributed and disposed at equal intervals.
Specifically, the distance between the center of the fourth filter cavity a14 of the first filter branch 12 and the center of the fifth filter cavity a15, the distance between the center of the fourth filter cavity a14 of the first filter branch 12 and the center of the first filter cavity a11, the distance between the center of the fourth filter cavity a14 of the first filter branch 12 and the center of the second filter cavity a12, the distance between the center of the fourth filter cavity a14 of the first filter branch 12 and the center of the third filter cavity a13, the distance between the center of the first filter cavity a11 of the first filter branch 12 and the center of the second filter cavity a12, and the distance between the center of the second filter cavity a12 of the first filter branch 12 and the center of the third filter cavity a13 are equal. By the mode, the filter cavity is convenient to arrange and debug, and the consistency of the filter 10 is improved; and, the distance between two adjacent filter chambers is equal, and it is closely arranged between five filter chambers, can further improve space utilization, reduce the volume.
In this embodiment, the filter includes a first filtering branch disposed on the housing, and is composed of five filtering cavities coupled in sequence, and two first capacitive cross-coupling zeros are formed; the distance between any two adjacent filter cavities in the first filter branch is equal. Through the mode, the first filtering branch circuit is in pure capacitive coupling, so that the product complexity can be reduced, and the stability of the filter is improved; the distances between adjacent filter cavities are equal, the filter cavities are regularly and compactly arranged, and the layout and miniaturization are facilitated.
Optionally, the housing 11 is further provided with a first port (not shown) and a second port (not shown), the first filter cavity a11 of the first filter branch 12 is connected with the first port, and the fifth filter cavity a15 of the first filter branch 12 is connected with the second port. Wherein the first port and the second port may both be taps of the filter 10.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 in this embodiment comprises a housing 11, a first filter branch 12 and a second filter branch 13. The same parts of this embodiment as those of the above embodiment will not be described herein again. The second filtering branch 13 may be a receiving filtering branch or a transmitting filtering branch.
The second filter branch 13 and the first filter branch 12 are arranged symmetrically with respect to the middle line MM' of the housing 11 in the second direction D.
As shown in fig. 3, the second filter branch 13 is disposed on the housing 11 and spaced apart from the first filter branch 12. Specifically, the second filtering branch 13 is composed of five filtering cavities 131 coupled in sequence, and further forms two second capacitive cross-coupling zeros 132; the five filter cavities 131 of the second filter branch 13 are arranged in a trapezoid shape, and the distances between any two adjacent filter cavities in the second filter branch 13 are equal.
The second filter branch 13 includes first through fifth filter cavities a21 through a 25. The five filter cavities 131 of the second filter branch 13 are divided into two rows arranged along the second direction D, and the first filter cavity a21 and the second filter cavity a22 of the second filter branch 13 are one row and are sequentially arranged along the first direction L; the fifth filter cavity a25, the fourth filter cavity a24 and the third filter cavity a23 of the second filter branch 13 are in a row and are sequentially arranged along the first direction L.
The fourth filtering cavity a24 of the second filtering branch 13 is further disposed adjacent to the fifth filtering cavity a25, the first filtering cavity a21, the second filtering cavity a22 and the third filtering cavity a23 of the second filtering branch 13, respectively.
The five filter cavities 131 of the second filter branch 13 are arranged in a trapezoid, as shown in fig. 3, a connecting line between the center of the first filter cavity a21 and the center of the second filter cavity a22 is an upper bottom of the trapezoid, a connecting line between the center of the fifth filter cavity a25, the center of the fourth filter cavity a24 and the center of the third filter cavity a23 is a lower bottom of the trapezoid, a connecting line between the center of the first filter cavity a21 and the center of the fifth filter cavity a25 and a connecting line between the center of the second filter cavity a22 and the center of the third filter cavity a23 are waists of the trapezoid, and since a distance between the center of the first filter cavity a21 and the center of the fifth filter cavity a25 is equal to a distance between the center of the second filter cavity a22 and the center of the third filter cavity a23, the trapezoid formed by the five filter cavities 131 is an isosceles trapezoid.
Capacitive cross coupling is respectively formed between the first filter cavity a21 and the fourth filter cavity a24 of the second filter branch 13 and between the second filter cavity a22 and the fourth filter cavity a24 of the second filter branch 13, so as to form two first capacitive cross-coupling zeros 132.
In this embodiment, the filter includes first filtering branch road and second filtering branch road, and wherein first filtering branch road and second filtering branch road set up with respect to the centre parting line symmetry on the casing second direction, and the filtering chamber arrangement rule in the filter does benefit to overall arrangement and miniaturization.
Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of another embodiment of the filter of the present application, and fig. 5 is a schematic topological structural diagram of a third filtering branch of the filter of the present application. The filter 10 in this embodiment includes a housing 11, a first filter branch 12, a second filter branch 13, a third filter branch 14, and a fourth filter branch 15. The same parts in this embodiment as those in the above embodiments are not described herein again. The third filtering branch 14 may be a receiving filtering branch or a transmitting filtering branch, and the fourth filtering branch 15 may be a receiving filtering branch or a transmitting filtering branch.
The third filtering branch 14 is composed of five filtering cavities 141 coupled in sequence, and further forms a third inductive cross-coupling zero point 142; the first filtering branch 12, the third filtering branch 14 and the second filtering branch 13 are sequentially arranged at intervals along the second direction D.
The third filter branch 14 includes first through fifth filter cavities B11 through B15. The five filter cavities 141 of the third filter branch 14 are arranged in a J-shape. Specifically, the first filter cavity B11, the second filter cavity B12 and the third filter cavity B13 of the third filter branch 14 are in a row and are sequentially arranged along the first direction L; the third filter cavity B13, the fourth filter cavity B14 and the fifth filter cavity B15 of the third filter branch 14 are arranged in a triangle, a projection of the center of the fourth filter cavity B14 of the third filter branch 14 in the second direction D is located between projections of the center of the third filter cavity B13 and the center of the fifth filter cavity B15 of the third filter branch 14 in the second direction D, and a projection of the center of the fifth filter cavity B15 of the third filter branch 14 in the first direction L is located between projections of the center of the third filter cavity B13 and the center of the fourth filter cavity B14 of the third filter branch 14 in the first direction L.
As shown in fig. 5, the third filter cavity B13 and the fifth filter cavity B15 of the third filter branch 14 are inductively cross-coupled to form a third inductive cross-coupling zero 142.
Specifically, a window may be disposed between the third filter cavity B13 and the fifth filter cavity B15 of the third filter branch 14, and a metal coupling rib is disposed on the window, so that the third filter cavity B13 and the fifth filter cavity B15 of the third filter branch 14 implement inductive cross coupling, and form a third inductive cross coupling zero 142, which is equivalent to the inductor L1 in fig. 5.
The fourth filter branch 15 and the third filter branch 14 are arranged symmetrically with respect to the middle line MM' of the housing 11 in the second direction D. The fourth filtering branch 15 is composed of five filtering cavities 151 coupled in sequence, and further forms a fourth inductive cross-coupling zero point 152. The first filtering branch 12, the third filtering branch 14, the fourth filtering branch 15 and the second filtering branch 13 are sequentially arranged at intervals along the second direction D.
In particular, the fourth filtering branch 15 comprises a first filtering chamber B21 through a fifth filtering chamber B25. The first filter cavity B21, the second filter cavity B22 and the third filter cavity B23 of the fourth filter branch 15 are in a row and are sequentially arranged along the first direction L; the third filtering cavity B23, the fourth filtering cavity B24 and the fifth filtering cavity B25 of the fourth filtering branch 15 are arranged in a triangle, the projection of the center of the fourth filtering cavity B24 of the fourth filtering branch 15 in the second direction D is located between the projection of the center of the third filtering cavity B23 and the projection of the center of the fifth filtering cavity B25 of the fourth filtering branch 15 in the second direction D, and the projection of the center of the fifth filtering cavity B25 of the fourth filtering branch 15 in the first direction L is located between the projection of the center of the third filtering cavity B23 and the projection of the center of the fourth filtering cavity B24 of the fourth filtering branch 15 in the first direction L.
The third filter cavity B23 of the fourth filter branch 15 is inductively cross-coupled with the fifth filter cavity B25 to form a third inductive cross-coupling zero 142.
The filter in the embodiment includes a first filtering branch, a second filtering branch, a third filtering branch and a fourth filtering branch, the first filtering branch and the second filtering branch are symmetrically arranged about the midline of the shell in the second direction, and the second filtering branch and the fourth filtering branch are symmetrically arranged about the midline of the shell in the second direction, that is, the arrangement of the filtering cavities in the filter is symmetrically arranged about the midline of the shell in the second direction, so the arrangement of the filtering cavities in the filter is regular and symmetrical, which is beneficial to layout and miniaturization; the first filtering branch and the second filtering branch are in pure capacitive cross coupling, the third filtering branch and the fourth filtering branch are in pure inductive cross coupling, consistency of materials is kept in the filtering branches, and stability of the filtering branches is improved.
Referring to fig. 6 and 7, fig. 6 is a schematic diagram of simulation results of a first filtering branch of the filter of the present application, and fig. 7 is a schematic diagram of simulation results of a third filtering branch of the filter of the present application. In this embodiment, the schematic diagrams of the simulation results of the first filtering branch 12 and the second filtering branch 13 are the same, specifically refer to fig. 6; the simulation results of the third filtering branch 14 and the fourth filtering branch are the same, and refer to fig. 7 specifically.
The bandwidth of the first filtering branch 12 is in the range of 2569Mhz to 2611 Mhz. Specifically, the coupling bandwidth between the input end and the first filter cavity a11 of the first filter branch 12 ranges from 41Mhz to 50 Mhz; the coupling bandwidth between the first filter cavity A11 and the second filter cavity A12 of the first filter branch 12 ranges from 30Mhz to 38 Mhz; the coupling bandwidth between the first filter cavity A11 and the fourth filter cavity A14 of the first filter branch 12 ranges from-10 Mhz to-15 Mhz; the coupling bandwidth between the second filter cavity A12 and the third filter cavity A13 of the first filter branch 12 ranges from 30Mhz to 38 Mhz; the coupling bandwidth between the second filter cavity A12 and the fourth filter cavity A14 of the first filter branch 12 ranges from-2 Mhz to 2 Mhz; the coupling bandwidth between the third filter cavity A13 and the fourth filter cavity A14 of the first filter branch 12 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the fourth filter cavity A14 and the fifth filter cavity A15 of the first filter branch 12 ranges from 33Mhz to 41 Mhz; the coupling bandwidth between the fifth filter cavity a15 of the first filter branch 12 and the output end is in the range of 41Mhz to 50 Mhz; therefore, the bandwidth of the first filtering branch 12 of the filter 10 of the present embodiment is 2569Mhz to 2611Mhz, which can meet the design requirement.
Therefore, the resonant frequencies of the first filter cavity a11 through the fifth filter cavity a15 of the first filter branch 12 are sequentially located in the following ranges: 2588 Mhz-2590 Mhz, 2589 Mhz-2591 Mhz, 2588 Mhz-2590 Mhz, and 2588 Mhz-2590 Mhz. Therefore, the resonant frequencies of the filter cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.
The bandwidth of the first filtering branch 12 is in the range of 2569Mhz to 2611Mhz, and as shown by the frequency band curve 20 in fig. 6, the frequency band curve 20 further forms a zero point C and a zero point D, so that the suppression of the first filtering branch 12 at the zero point C satisfies: 2560MHz is more than 20 dB; the suppression at zero D satisfies 2620MHz > 20 dB.
The bandwidth of the third filtering branch 14 is in the range of 1686Mhz 2204 Mhz. Specifically, the coupling bandwidth between the input end and the first filter cavity B11 of the third filter branch 14 ranges from 517Mhz to 579 Mhz; the coupling bandwidth between the first filter cavity B11 and the second filter cavity B12 of the third filter branch 14 ranges from 419Mhz to 470 Mhz; the coupling bandwidth between the second filter cavity B12 and the third filter cavity B13 of the third filter branch 14 ranges from 302Mhz to 340 Mhz; the coupling bandwidth range between the third filter cavity B13 and the fourth filter cavity B14 of the third filter branch 14 is 283 Mhz-319 Mhz; the coupling bandwidth between the third filter cavity B13 and the fifth filter cavity B15 of the third filter branch 14 ranges from 122Mhz to 140 Mhz; the coupling bandwidth range between the fourth filter cavity B14 and the fifth filter cavity B15 of the third filter branch 14 is 401 Mhz-450 Mhz; the coupling bandwidth range between the fifth filter cavity B15 of the third filter branch 14 and the output end is 517 Mhz-579 Mhz; therefore, the bandwidth of the third filtering branch 14 of the filter 10 of the present embodiment is 1686Mhz to 2204Mhz, which can meet the design requirement.
Therefore, the resonant frequencies of the first filter cavity B11 through the fifth filter cavity B15 of the third filter branch 14 are sequentially located in the following ranges: 1921 Mhz-1923 Mhz, 1919 Mhz-1921 Mhz, 1910 Mhz-1912 Mhz, 2020 Mhz-2022 Mhz, and 1921 Mhz-1923 Mhz. Therefore, the resonant frequencies of the filter cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.
The bandwidth of the third filtering branch 14 is in the range of 1686Mhz to 2204Mhz, as shown by the frequency band curve 30 in fig. 7, the frequency band curve 30 also forms a zero point E, so that the suppression of the third filtering branch 14 at the zero point E satisfies: 2574.5MHz is greater than 45 dB.
The parameters of the second filtering branch 13 may be set according to the parameters of the first filtering branch 12, and the parameters of the fourth filtering branch 15 may be set according to the parameters of the third filtering branch 14, which will not be described herein again.
As can be seen from the above, the first filtering branch 12 and the third filtering branch 14 are both provided with the cross-coupling zero point, so that the bandwidth of the first filtering branch 12 is 2569Mhz to 2611Mhz, the bandwidth of the third filtering branch 14 is 1686Mhz to 2204Mhz, the first signal of the first filtering branch 12 is highly isolated from the third signal of the third filtering branch, and the out-of-band rejection performance of the filter 10 is improved.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a communication device according to the present application. The communication device 80 may include an antenna 81 and a Radio frequency Unit 82(Remote Radio Unit, RRU) connected to the antenna 81, where the Radio frequency Unit 82 includes the filter 10 shown in the above embodiment, and the filter 10 may be used to filter a Radio frequency signal. Therefore, the bandwidth of the first frequency band signal of the communication device 80 may be 2569Mhz to 2611Mhz, and the bandwidth of the first frequency band signal may be 1686Mhz to 2204Mhz, which can meet the design requirement.
The communication device 80 may be a base station through which a terminal may communicate with other terminals. In other embodiments, the rf Unit 82 and the Antenna 81 may be designed integrally to form an Active Antenna Unit (AAU).
Some embodiments of the present application are filters, which may also be referred to as combiners, i.e., dual-frequency combiners. It is understood that in other embodiments, the duplexer may be referred to as a duplexer.
It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A filter, characterized in that the filter comprises:
a housing having a first direction and a second direction perpendicular to each other;
the first filtering branch is arranged on the shell, consists of five filtering cavities which are sequentially coupled, and forms two first capacitive cross-coupling zeros;
the distance between any two adjacent filter cavities in the first filter branch is equal, and the five filter cavities of the first filter branch are in trapezoidal arrangement.
2. The filter of claim 1,
the five filter cavities of the first filter branch circuit are divided into two rows arranged along the second direction;
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 first filtering cavities and the second filtering cavities of the first filtering branch are in a row and are sequentially arranged along the first direction;
the fourth filtering cavity of the first filtering branch is further respectively adjacent to the fifth filtering cavity, the first filtering cavity, the second filtering cavity and the third filtering cavity of the first filtering branch.
3. The filter of claim 2,
capacitive cross coupling is respectively performed between the first filtering cavity and the fourth filtering cavity of the first filtering branch circuit and between the second filtering cavity and the fourth filtering cavity of the first filtering branch circuit, so that two first capacitive cross coupling zeros are formed.
4. The filter of claim 3,
the distance between the center of the fourth filter cavity of the first filter branch and the center of the fifth filter cavity, the distance between the center of the fourth filter cavity of the first filter branch and the center of the first filter cavity, the distance between the center of the fourth filter cavity of the first filter branch and the center of the second filter cavity, the distance between the center of the fourth filter cavity of the first filter branch and the center of the third filter cavity, the distance between the center of the first filter cavity of the first filter branch and the center of the second filter cavity, and the distance between the center of the second filter cavity of the first filter branch and the center of the third filter cavity are equal.
5. The filter of claim 4, further comprising a second filter branch, wherein the second filter branch and the first filter branch are symmetrically disposed with respect to a midline of the housing in the second direction.
6. The filter of claim 5, further comprising:
the third filtering branch consists of five filtering cavities which are coupled in sequence, and further forms a third inductive cross coupling zero point, and the five filtering cavities of the third filtering branch are arranged in a J shape;
the first filtering branch, the third filtering branch and the second filtering branch are sequentially arranged at intervals along the second direction.
7. The filter of claim 6,
the first filtering cavity, the second filtering cavity and the third filtering cavity of the third filtering branch are in a row and are sequentially arranged along the first direction;
the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the third filtering branch are arranged in a triangular mode, the center of the fourth filtering cavity of the third filtering branch is located in the projection in the second direction, the center of the third filtering cavity and the center of the fifth filtering cavity of the third filtering branch are located between the projections in the second direction, and the center of the fifth filtering cavity of the third filtering branch is located in the projection in the first direction.
8. The filter according to claim 7, wherein the third filter cavity and the fifth filter cavity of the third filter branch are inductively cross-coupled to form one of the third inductive cross-coupling zeros.
9. The filter of claim 8, further comprising a fourth filtering branch, wherein the fourth filtering branch and the third filtering branch are symmetrically disposed with respect to a midline of the housing in the second direction;
the first filtering branch, the third filtering branch, the fourth filtering branch and the second filtering branch are sequentially arranged at intervals along the second direction.
10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering the radio frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911361399.5A CN113036365A (en) | 2019-12-25 | 2019-12-25 | Communication device and filter thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911361399.5A CN113036365A (en) | 2019-12-25 | 2019-12-25 | Communication device and filter thereof |
Publications (1)
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| CN113036365A true CN113036365A (en) | 2021-06-25 |
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| US5801606A (en) * | 1995-12-12 | 1998-09-01 | Alcatel Telspace | Pseudo-elliptical filter for the millimeter band using waveguide technology |
| CA2434614A1 (en) * | 2002-07-29 | 2004-01-29 | Alcatel | Canonical general response bandpass microwave filter |
| CN201616497U (en) * | 2009-11-25 | 2010-10-27 | 沈昕 | Cavity filter |
| US20120299667A1 (en) * | 2011-05-25 | 2012-11-29 | Hsu Wei-Hong | Cavity filter having feedback arrangement |
| CN209232921U (en) * | 2018-12-14 | 2019-08-09 | 深圳市大富科技股份有限公司 | A kind of combining formula cavity body filter and communication equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5801606A (en) * | 1995-12-12 | 1998-09-01 | Alcatel Telspace | Pseudo-elliptical filter for the millimeter band using waveguide technology |
| CA2434614A1 (en) * | 2002-07-29 | 2004-01-29 | Alcatel | Canonical general response bandpass microwave filter |
| CN201616497U (en) * | 2009-11-25 | 2010-10-27 | 沈昕 | Cavity filter |
| US20120299667A1 (en) * | 2011-05-25 | 2012-11-29 | Hsu Wei-Hong | Cavity filter having feedback arrangement |
| CN209232921U (en) * | 2018-12-14 | 2019-08-09 | 深圳市大富科技股份有限公司 | A kind of combining formula cavity body filter and communication equipment |
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