CN211125963U - Low-pass filter and communication device - Google Patents
Low-pass filter and communication device Download PDFInfo
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- CN211125963U CN211125963U CN201922359298.6U CN201922359298U CN211125963U CN 211125963 U CN211125963 U CN 211125963U CN 201922359298 U CN201922359298 U CN 201922359298U CN 211125963 U CN211125963 U CN 211125963U
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Abstract
The application discloses a low-pass filter and a communication device. The low-pass filter includes: the filtering cavity is provided with a plurality of resonant cavities; the stripline comprises at least two low-pass filtering structures and at least one band-stop filtering structure, and each low-pass filtering structure and each band-stop filtering structure are arranged in different resonant cavities. Through the mode, the flexibility of the structural design of the filtering cavity can be improved, the size of the filtering cavity can be reasonably utilized, and the filtering index can be conveniently realized.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a low-pass filter and a communications apparatus.
Background
With the development of communication technology, the frequency spectrum is used more and more densely, and a low-pass filter is often used in a multi-band combiner, but due to the limitation of structure and size, a common stripline low-pass filter or stripline band-stop filter often cannot realize a filtering index, or is difficult to realize the filtering index.
SUMMERY OF THE UTILITY MODEL
The application provides a low pass filter and communication device to improve the flexibility of filtering cavity structural design, can rational utilization filtering cavity volume, and be convenient for realize the filtering index.
In order to solve the technical problem, the application adopts a technical scheme that: a low pass filter is provided. The low-pass filter includes: the filtering cavity is provided with a plurality of resonant cavities; the strip line comprises at least two low-pass filtering structures and at least one band-stop filtering structure, and each low-pass filtering structure and each band-stop filtering structure are arranged in different resonant cavities.
The at least two low-pass filtering structures are sequentially connected along a coupling path, and the first low-pass filtering structure or the last low-pass filtering structure is connected with the band-stop filtering structure.
Wherein the low pass filtering structure comprises: a first low impedance line and a first high impedance line arranged along the coupling path; one end of a first high-impedance line of one low-pass filter structure is connected with a first low-impedance line of the other low-pass filter structure, and the other end of the first high-impedance line of the one low-pass filter structure is connected with a first low-impedance line of the other low-pass filter structure or connected with the band-elimination filter structure.
Wherein the band-stop filtering structure comprises: and the second high-impedance line and the second low-impedance line are arranged in the direction vertical to the coupling path, one end of the second high-impedance line is connected with the second low-impedance line, and the other end of the second high-impedance line is connected with the first high-impedance line of the low-pass filtering structure.
The filter cavity is provided with a first direction and a second direction which are perpendicular to each other, and the at least two low-pass filter structures and the at least one band-stop filter structure are arranged along the first direction.
The filter cavity is provided with a first direction and a second direction which are perpendicular to each other, and the at least two low-pass filter structures and the at least one band-stop filter structure are arranged along the first direction.
The low-pass filter further comprises an input port and an output port, the input end of the strip line is connected with the input port through a matching strip line, and the output end of the strip line is connected with the output port through a matching strip line.
Wherein, the strip line is a metal sheet.
Wherein the low pass filter further comprises: the fixing piece is provided with a mounting hole on the strip line, and the fixing piece is matched with the mounting hole to fix the strip line on the inner wall of the filtering cavity.
In order to solve the technical problem, the application adopts a technical scheme that: a communication apparatus is provided. The communication device comprises an antenna and the low-pass filter, wherein the low-pass filter is connected with the antenna and is used for filtering the transceiving signals of the antenna.
The beneficial effects of the embodiment of the application are that: unlike the prior art, the low-pass filter of the embodiment of the present application includes: the filtering cavity is provided with a plurality of resonant cavities; the stripline comprises at least two low-pass filtering structures and at least one band-stop filtering structure, and each low-pass filtering structure and each band-stop filtering structure are arranged in different resonant cavities. The low pass filter of the embodiment of the application adopts a combined structure of a low pass filter structure and a band elimination filter structure, can avoid the problems that the length of the traditional stripline low pass filter is too large and the width of the stripline band elimination filter is too large, can improve the flexibility of the structural design of a filter cavity, can reasonably utilize the volume of the filter cavity, and is convenient for realizing filter indexes.
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 an embodiment of a low pass filter according to the present application;
FIG. 2 is a schematic structural diagram of a low-pass filtering structure and a band-stop filtering structure in the low-pass filter of the embodiment of FIG. 1;
FIG. 3 is a schematic structural diagram of an embodiment of the low pass filter of the present application;
FIG. 4 is a schematic structural diagram of a low-pass filtering structure and a band-stop filtering structure in the low-pass filter of the embodiment in FIG. 3;
FIG. 5 is a schematic circuit diagram of an embodiment of the low pass filter of the present application;
fig. 6 is a schematic structural diagram of an embodiment of a communication device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
In the design of the low-pass filter scheme, the specific positions of the input port and the output port are usually fixed, and the cavity structure can be irregular in a limited volume. In the face of some special cavity structures (such as fixed input/output ports, unequal width of low pass grooves, short length, etc.), if a common stripline low pass filter or stripline band stop filter is adopted, although the requirement of filtering indexes can be met, the cavity structure is complex, the production process is complex, and the cost is increased.
To solve the above problem, the present application first proposes a low-pass filter, as shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an embodiment of the low-pass filter of the present application; fig. 2 is a schematic structural diagram of a low-pass filtering structure and a band-stop filtering structure in the low-pass filter of fig. 1. The low-pass filter 10 of the present embodiment includes: the filter comprises a filter cavity 20 and strip lines 30, wherein the filter cavity 20 is provided with a plurality of resonant cavities 210; the stripline 30 includes at least two lowpass filtering structures 310 and at least one bandstop filtering structure 320, and each lowpass filtering structure 310 and each bandstop filtering structure 320 are respectively disposed in a different resonator 210.
Different from the prior art, the low-pass filter 10 of the present embodiment adopts a combination structure of the low-pass filtering structure 310 and the band-stop filtering structure 320, so that the problems of the conventional stripline low-pass filter that the length is too large and the width of the stripline band-stop filter is too large can be avoided, the flexibility of the structural design of the filtering cavity 20 can be improved, the volume of the filtering cavity 20 can be reasonably utilized, and the filtering index can be conveniently realized.
Optionally, the filter 10 of the present embodiment further includes an input port 40 and an output port 50, wherein an input end (not shown) of the strip line 30 is connected to the input port 40 through a matching strip line (not shown), and an output end (not shown) of the strip line 30 is connected to the output port 50 through a matching strip line (not shown).
Optionally, at least two lowpass filtering structures 310 of the present embodiment are sequentially connected along the coupling path, a first lowpass filtering structure 310 is connected to the input port 40 through a matching stripline, a last lowpass filtering structure 310 is connected to the bandstop filtering structure 320, and the bandstop filtering structure 320 is connected to the output port 50 through a matching stripline.
The coupling path of the present embodiment refers to the main transmission path of the filtered signal of the strip line 30.
Among them, the low-pass filtering structure 310 includes: the first low impedance line 311 and the first high impedance line 312, the first low impedance line 311 and the first high impedance line 312 are arranged along a coupling path.
One end of the first high impedance line 312 of one low pass filter structure 310 is connected to the first low impedance line 311 of the low pass filter structure 310, and the other end of the first high impedance line 312 is connected to the first low impedance line 311 of another low pass filter structure 310 or to the band stop filter structure 320.
In the present embodiment, the strip line 30 includes three low-pass filter structures 310 and one band-stop filter structure 320, wherein the first low impedance line 311 of the first low-pass filter structure 310 is connected to the input port 40 through the matching strip line; one end of the first high impedance line 312 of the first low-pass filter structure 310 is connected to the first low impedance line 311 of the first low-pass filter structure 310, and the other end of the first high impedance line 312 of the first low-pass filter structure 310 is connected to the first low impedance line 311 of the second low-pass filter structure 310; one end of the first high impedance line 312 of the second low-pass filter structure 310 is connected to the first low impedance line 311 of the second low-pass filter structure 310, and the other end of the first high impedance line 312 of the second low-pass filter structure 310 is connected to the first low impedance line 311 of the third low-pass filter structure 310; one end of the first high impedance line 312 of the third low-pass filter structure 310 is connected to the first low impedance line 311 of the third low-pass filter structure 310, and the other end of the first high impedance line 312 of the third low-pass filter structure 310 is connected to the band-stop filter structure 320.
The present embodiment implements a low pass filter by at least two low pass filtering structures 310.
In the stripline filter structure, the stripline with a wider linewidth may be equivalent to a capacitor, and the stripline with a narrower linewidth may be equivalent to an inductor, so that the alternating arrangement of the high impedance line and the low impedance line of the at least two low-pass filter structures 310 of the present embodiment may be equivalent to at least two L C filter circuits arranged in series.
Optionally, the band-stop filtering structure 320 of this embodiment includes: and a second high impedance line 321 and a second low impedance line 322 arranged in a direction perpendicular to the coupling path, wherein one end of the second high impedance line 321 is connected to the second low impedance line 322, and the other end of the second high impedance line 321 is connected to the first high impedance line 312 of the low pass filter structure 310.
In this embodiment, the other end of the second high impedance line 321 is connected to the first high impedance line 312 of the third low pass filter structure 310, and the other end of the second high impedance line 321 is connected to the output port 50 through the matching strip line.
Optionally, the filter cavity 20 has a first direction x and a second direction y perpendicular to each other; the at least two low-pass filtering structures 310 are arranged along a first direction x, and the at least two low-pass filtering structures 310 and the at least one band-stop filtering structure 320 are arranged along a second direction y.
In this embodiment, three low-pass filtering structures 310 are arranged along the first direction x, and one band-stop filtering structure 320 and the three low-pass filtering structures 310 are arranged along the second direction y.
Alternatively, the strip line 30 is a metal sheet. In other embodiments, the striplines may be made of other conductive materials, or may be in other non-sheet configurations.
Optionally, the low pass filter 10 further comprises: a fixing member 60, wherein a mounting hole (not shown) is formed on the strip line 30, and the fixing member 60 is matched with the mounting hole to fix the strip line 30 on the inner wall of the filter cavity 20; the fixing member 60 may be an insulating screw or the like.
In another embodiment, as shown in fig. 3 to 5, fig. 3 is a schematic structural diagram of an embodiment of the low-pass filter of the present application; FIG. 4 is a schematic structural diagram of a low-pass filtering structure and a band-stop filtering structure in the low-pass filter of the embodiment in FIG. 3; fig. 5 is a schematic circuit diagram of an embodiment of the low-pass filter of the present application. The low-pass filter 10 of the present embodiment is different from the low-pass filter 10 of the above-described embodiment in that: the second high impedance line 321 of the band-stop filter structure 320 of the present embodiment is connected to the input port 40 through a matching stripline (not shown), and the second high impedance line 321 of the band-stop filter structure 320 is further connected to the first high impedance line 312 of the first low-pass filter structure 310; the first low impedance line 311 of the third low pass filter structure 310 is connected to the output port 50 via a matching stripline (not shown).
In this implementation, the at least two low-pass filtering structures 310 and the at least one band-stop filtering structure 320 are arranged along the first direction x. In particular, the three low-pass filtering structures 310 and the band-stop filtering structure 320 are arranged along the first direction x.
As shown in fig. 5, the equivalent circuit of the band-stop filter structure 320 is the circuit 52, and the equivalent circuits of the three low-pass filter structures 310 are the circuits 51.
It should be noted that the structure of the low-pass filter in the embodiment of the present application is not limited to the number and arrangement of the low-pass filter structures and the band-stop filter structures described above.
The present application further provides a communication device, 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 60 of the present embodiment includes an antenna 61 and a low-pass filter 62, and the low-pass filter 62 is connected to the antenna 61 and filters a transmission/reception signal of the antenna 61.
The low-pass filter 62 of this embodiment is similar to the low-pass filter 10 of the previous embodiment, and will be described in detail herein.
Different from the prior art, the filter of the embodiment of the application comprises: the low-pass filter of the embodiment of the application comprises: the filtering cavity is provided with a plurality of resonant cavities; the stripline comprises at least two low-pass filtering structures and at least one band-stop filtering structure, and each low-pass filtering structure and each band-stop filtering structure are arranged in different resonant cavities. The low pass filter of the embodiment of the application adopts a combined structure of a low pass filter structure and a band elimination filter structure, can avoid the problems that the length of the traditional stripline low pass filter is too large and the width of the stripline band elimination filter is too large, can improve the flexibility of the structural design of a filter cavity, can reasonably utilize the volume of the filter cavity, and is convenient for realizing filter indexes.
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 low-pass filter, characterized in that the low-pass filter comprises:
the filtering cavity is provided with a plurality of resonant cavities;
the strip line comprises at least two low-pass filtering structures and at least one band-stop filtering structure, and each low-pass filtering structure and each band-stop filtering structure are arranged in different resonant cavities.
2. A low-pass filter according to claim 1, characterized in that the at least two low-pass filtering structures are connected in series along a coupling path, the first or the last of the low-pass filtering structures being connected with the band-stop filtering structure.
3. A low-pass filter as claimed in claim 2, characterized in that the low-pass filtering structure comprises: a first low impedance line and a first high impedance line arranged along the coupling path;
one end of a first high-impedance line of one low-pass filter structure is connected with a first low-impedance line of the other low-pass filter structure, and the other end of the first high-impedance line of the one low-pass filter structure is connected with a first low-impedance line of the other low-pass filter structure or connected with the band-elimination filter structure.
4. A low-pass filter according to claim 3, characterized in that the band-stop filtering structure comprises: and the second high-impedance line and the second low-impedance line are arranged in the direction vertical to the coupling path, one end of the second high-impedance line is connected with the second low-impedance line, and the other end of the second high-impedance line is connected with the first high-impedance line of the low-pass filtering structure.
5. A low-pass filter according to claim 1, characterized in that the filter cavity has a first direction and a second direction perpendicular to each other, the at least two low-pass filtering structures and the at least one band-stop filtering structure being arranged along the first direction.
6. The low-pass filter according to claim 1, wherein the filter cavity has a first direction and a second direction perpendicular to each other, the at least two low-pass filtering structures are arranged along the first direction, and the at least two low-pass filtering structures and the at least one band-stop filtering structure are arranged along the second direction.
7. A low-pass filter as claimed in claim 1, characterized in that the low-pass filter further comprises an input port and an output port, the input ends of the strip lines being connected to the input port by matching strip lines, and the output ends of the strip lines being connected to the output port by matching strip lines.
8. A low-pass filter as claimed in claim 1, characterized in that the strip line is a metal sheet.
9. A low-pass filter as claimed in claim 1, characterized in that the low-pass filter further comprises: the fixing piece is provided with a mounting hole on the strip line, and the fixing piece is matched with the mounting hole to fix the strip line on the inner wall of the filtering cavity.
10. A communication apparatus, comprising an antenna and a low pass filter according to any one of claims 1 to 9, the low pass filter being connected to the antenna for filtering a transmission/reception signal of the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922359298.6U CN211125963U (en) | 2019-12-23 | 2019-12-23 | Low-pass filter and communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922359298.6U CN211125963U (en) | 2019-12-23 | 2019-12-23 | Low-pass filter and communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211125963U true CN211125963U (en) | 2020-07-28 |
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| CN201922359298.6U Active CN211125963U (en) | 2019-12-23 | 2019-12-23 | Low-pass filter and communication device |
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| CN (1) | CN211125963U (en) |
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Address after: 233000 building 4, national financial incubation Industrial Park, 17 Yannan Road, high tech Zone, Bengbu City, Anhui Province Patentee after: Dafu Technology (Anhui) Co., Ltd Address before: 518104 First, Second and Third Floors of A1, A2, A3 101, A4 of Shajing Street, Shajing Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN TATFOOK TECHNOLOGY Co.,Ltd. |