CN220692296U - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN220692296U CN220692296U CN202322405988.7U CN202322405988U CN220692296U CN 220692296 U CN220692296 U CN 220692296U CN 202322405988 U CN202322405988 U CN 202322405988U CN 220692296 U CN220692296 U CN 220692296U
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Abstract
The embodiment of the application relates to the technical field of communication and discloses a filter and communication equipment, wherein the filter comprises an input port, two short circuit branches, a first open circuit branch, a second open circuit branch, a first parallel line, a second parallel line, a microstrip line and an output port, wherein the first parallel line and the second parallel line are symmetrically arranged relative to a microstrip line, one short circuit branch is arranged at one end of the microstrip line, one short circuit branch is arranged at the other end of the microstrip line, and the two short circuit branches are oppositely arranged; one end of the first open-circuit branch is connected with the input port, one end of the second open-circuit branch is connected with the output port, the first open-circuit branch is arranged in parallel with the first parallel line, the second open-circuit branch is arranged in parallel with the second parallel line, and the input port, the first parallel line, the microstrip line, the second parallel line and the output port are cascaded on the same straight line. Through the mode, the filter formed by the embodiment of the application has the characteristics of controllable notch width and miniaturization.
Description
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a filter and communication equipment.
Background
Ultra wideband filters are important electronic devices in radio frequency systems and have a very small impact on the quality of the communication system. The filter is used for screening the needed information, delivering useful information as far as possible and filtering out useless information such as noise.
In the implementation of the embodiment of the present application, the inventors found that: currently, ultra-wideband filters with notch characteristics are basically formed by adopting a scheme of inserting a notch structure, but the center frequency of the notch can only be controlled, the notch width is uncontrollable, and the ultra-wideband filters with notch characteristics have the problem of oversized structure, so that the ultra-wideband filters are unfavorable for being used in modern wireless communication systems.
Disclosure of Invention
The technical problem that this application embodiment mainly solves is to provide a wave filter, through setting up two short circuit branches, two open circuit branches, two parallel lines and microstrip line, two short circuit branches for microstrip spool symmetry sets up, two parallel lines for microstrip spool symmetry sets up, two open circuit branches with two parallel lines parallel arrangement, the wave filter that forms through above-mentioned structure not only has the controllable and miniaturized characteristics of notch width.
In order to solve the technical problems, a technical scheme adopted by the embodiment of the application is as follows: the filter comprises an input port, two short circuit branches, a first open circuit branch, a second open circuit branch, a first parallel line, a second parallel line, a microstrip line and an output port, wherein the first parallel line and the second parallel line are symmetrically arranged relative to the microstrip line, one short circuit branch is arranged at one end of the microstrip line, one short circuit branch is arranged at the other end of the microstrip line, and the two short circuit branches are oppositely arranged; one end of the first open-circuit branch is connected with the input port, one end of the second open-circuit branch is connected with the output port, the first open-circuit branch is arranged in parallel with the first parallel line, the second open-circuit branch is arranged in parallel with the second parallel line, and the input port, the first parallel line, the microstrip line, the second parallel line and the output port are cascaded on the same straight line.
Optionally, the first open stub is spaced from the first parallel line by a distance of 0.68mm; the second open stub is spaced from the second parallel line by a distance of 0.68mm.
Optionally, the two short circuit branches are symmetrically arranged relative to the microstrip line axis, and the two short circuit branches and the microstrip line are in an i-shaped structure.
Optionally, the sum of the electrical length of the short-circuit branch and one half of the electrical length of the microstrip line is a quarter wavelength corresponding to the center frequency of the filter.
Optionally, the electrical length of the first open circuit branch and the electrical length of the second open circuit branch are each a quarter wavelength corresponding to the center frequency of the filter; the electrical length of the first parallel line and the electrical length of the second parallel line are each a quarter wavelength corresponding to the center frequency of the filter.
Optionally, the first parallel line includes a first transmission line and a second transmission line, one end of the first transmission line is connected with the microstrip line, one end of the second transmission line is connected with the input port, and a separation distance between the first open branch and the first transmission line is 0.65mm.
The second parallel line comprises a third transmission line and a fourth transmission line, one end of the third transmission line is connected with the microstrip line, one end of the fourth transmission line is connected with the output port, and the interval distance between the second open-circuit branch and the third transmission line is 0.65mm.
Optionally, the microstrip line ranges from 1.9 to 2.1 times the width of the short circuit stub.
In order to solve the technical problems, another technical scheme adopted in the embodiment of the application is as follows: there is provided a communication device comprising any of the filters described above.
The embodiment of the application provides a filter, which comprises an input port, two short circuit branches, a first open circuit branch, a second open circuit branch, a first parallel line, a second parallel line, a microstrip line and an output port, wherein the first parallel line and the second parallel line are symmetrically arranged relative to the microstrip line, one short circuit branch is arranged at one end of the microstrip line, one short circuit branch is arranged at the other end of the microstrip line, and the two short circuit branches are oppositely arranged; one end of the first open branch is connected with the input port, one end of the second open branch is connected with the output port, the first open branch is parallel to the first parallel line, the second open branch is parallel to the second parallel line, the input port, the first parallel line, the microstrip line, the second parallel line and the output port are cascaded on the same straight line, and the filter formed by the structure has the characteristics of controllable notch width and miniaturization.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a filter according to an embodiment of the present application;
FIG. 2 is another schematic diagram of a filter according to an embodiment of the present application;
FIG. 3 is S-parameter simulation results of a filter according to an embodiment of the present application;
fig. 4 is another simulation result of S parameters of the filter according to the embodiment of the present application.
Reference numerals in the specific embodiments are as follows: 100. a filter; 10. short circuit branches; 20. a first open-circuit stub; 30. a second open-circuit stub; 40. a first parallel line; 401. a first transmission line; 402. a second transmission line; 50. a second parallel line; 501. a third transmission line; 502. a fourth transmission line; 60. a microstrip line; 70. output port, 80, input port.
Detailed Description
In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like as used in this specification, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, fig. 1 is a block diagram of a filter 100 provided in the present application, where the filter 100 includes an input port 80 and an output port 70, and two short-circuit branches 10, a first open-circuit branch 20, a second open-circuit branch 30, a first parallel line 40, a second parallel line 50, and a microstrip line 60 are included between the output port 70 and the input port 80.
The first parallel line 40 and the second parallel line 50 are axisymmetrically arranged relative to the microstrip line 60, a short circuit branch 10 is arranged at one end of the microstrip line 60, a short circuit branch 10 is arranged at the other end of the microstrip line 60, the two short circuit branches 10 are oppositely arranged, one end of the first open circuit branch 20 is connected with the input port 80, one end of the second open circuit branch 30 is connected with the output port 70, the first open circuit branch 20 is parallel to the first parallel line 40, the second open circuit branch 30 is parallel to the second parallel line 50, the input port 80 is cascaded with the first parallel line 40, the microstrip line 60, the second parallel line 50 and the output port 70 on the same straight line, the two short circuit branches 10, the first open circuit branch 20, the second open circuit branch 30, the first parallel line 40, the second parallel line 50 and the microstrip line 60 form a resonance unit, in-band interference can be effectively filtered, and a compact circuit size is achieved.
With continued reference to FIG. 1, in some preferred embodiments, the first open stub 20 is spaced from the first parallel line 40 by a distance of 0.68mm; the second open stub 30 is spaced from the second parallel line 50 by a distance of 0.68mm. Specifically, the first parallel line 40 includes a first transmission line 401 and a second transmission line 402, the second parallel line 50 includes a third transmission line 501 and a fourth transmission line 502, one end of the first transmission line 401 is connected to the microstrip line 60, one end of the second transmission line 402 is connected to the input port 80, and the first open stub 20 is spaced apart from the first transmission line 401 by 0.65mm, one end of the third transmission line 501 is connected to the microstrip line 60, one end of the fourth transmission line 502 is connected to the output port 70, and the second open stub 30 is spaced apart from the third transmission line 501 by 0.65mm, and the second open stub 30 and the second parallel line 50 are spaced apart from each other by a distance of 0.65mm, thereby increasing the reflective performance of the filter in the parallel lines 100 by increasing the distance between the first open stub 20 and the first parallel line 40 by 0.65mm.
In some preferred embodiments, the electrical length of the first open stub 20 and the electrical length of the second open stub 30 are one quarter wavelength corresponding to the center frequency of the filter 100; the electrical length of the first parallel lines 40 and the electrical length of the second parallel lines 50 are one quarter wavelength corresponding to the center frequency of the filter 100.
In the embodiment of the present application, the physical widths of the first open circuit branch 20 and the second open circuit branch 30 are wider than the physical widths of the first parallel line 40 and the second parallel line 50, effectively increasing the isolation at the notch center frequency.
In this embodiment, the two short-circuit branches 10 are axisymmetrically disposed with respect to the microstrip line 60, and the two short-circuit branches 10 and the microstrip line 60 are in an "i" structure, and a sum of an electrical length of the short-circuit branches 10 and a half of an electrical length of the microstrip line 60 is a quarter wavelength corresponding to a center frequency of the filter 100.
In this embodiment of the present application, the width of the microstrip line 60 is 1.9 to 2.1 times that of the short-circuit branch 10, and the specific value may be defined according to practical situations, preferably the value is twice in this embodiment of the present application, and the purpose of adjustable notch bandwidth of the filter 100 may be achieved by adjusting the width of the microstrip line 60.
Referring to fig. 2 and 3, the first parallel line 40 and the second parallel line 50 are axially symmetrically arranged with respect to the microstrip line 60, the two short-circuit branches 10 are axially symmetrically arranged with respect to the microstrip line 60, the filter 100 is arranged on a circuit board made of Rogers RO4003B based on the symmetrical structure of the filter 100, the dielectric constant of the circuit board is 3.38, the dielectric loss is 0.0022, the thickness is 0.813mm, the circuit board size is 23.0mm x 10.0mm, and one half of the physical length l of the short-circuit branches 10 3 One half physical length l of the microstrip line 60 of 7.15mm 2 2.75mm, the physical width of the microstrip line 60 is w 2 (w 3 For the physical width of the short circuit branch 10), takes a value of 1.4mm, the physical length of the first open circuit branch 20 and the second open circuitThe physical length of the branches 30 is l 1 The value is 8.75mm, and the physical width of the first open branch 20 and the physical length of the second open branch 30 are both w 1 The value is 0.35mm, the physical length of the first parallel line and the physical length of the second parallel line 50 are l P The value of the distance s between the first parallel line 40 and the first open branch 20 is 8.75mm 1 Is 0.65mm, the physical width of the first transmission line 401, the physical width of the second transmission line 402, the physical width of the third transmission line 501 and the physical width of the fourth transmission line 502 are w P The value of the transmission line is 0.3mm, the interval distance between the first transmission line 401 and the second transmission line 402 and the interval distance between the third transmission line 501 and the fourth transmission line 502 are all set as s P The value is 0.1mm. With the above arrangement, as shown in fig. 3, the S-parameter simulation result of the filter 100 shows that the impedance bandwidth range of the filter 100 with the reflection coefficient smaller than-10 dB is 3.359 to 7.375GHz, the passband center frequency is 5.367GHz, the absolute bandwidth of the passband is 4.016GHz, and the relative bandwidth of the passband is 74.83%; the notch bandwidth of the filter 100 with isolation greater than 15dB ranges from 5.125 to 5.419GHz, the notch center frequency is 5.272GHz, the absolute notch bandwidth is 0.294GHz, and the notch relative bandwidth is 5.58%. From the simulation results, the filter 100 has sufficient passband bandwidth to support high-speed transmission of communication data, and the notch characteristics of the filter can effectively inhibit interference of the wireless local area network in the frequency band of 5.15-5.35 GHz. In addition, there are four transmission poles in the passband, respectively at 3.5,4.24,6.3,7.22ghz. These four transmission poles ensure flatness of the passband of the filter 100.
Referring to FIG. 4, in some embodiments, the l 1 And l P 8.96mm, w 1 0.4mm, s 1 0.35mm, l 2 2.6mm, l 3 7.5mm, w 2 ＝2w 3 1.0mm, w P 0.3mm, s P As shown by the S parameter simulation result in FIG. 4, the impedance bandwidth range with the reflection coefficient smaller than-10 dB is 3.202 to 7.374GHz, the passband center frequency is 5.288GHz, the absolute bandwidth of the passband is 4.172GHz, and the relative bandwidth of the passband is 7The notch bandwidth with the isolation of more than 15dB is in a range of 5.203 to 5.305GHz, the notch center frequency is 5.254GHz, the absolute bandwidth of the notch is 0.102GHz, and the relative bandwidth of the notch is 1.94%. In addition, four transmission poles respectively positioned at 3.381,4.32,6.04 and 7.16GHz are also arranged in the passband, so that the flatness of the passband of the filter 100 is ensured.
Comparing the two simulation results of fig. 3 and 4, it can be known that the passband bandwidth and the center frequency of the filter corresponding to the two sets of parameters are almost indistinguishable and have good in-band filtering performance, but the notch bandwidth of the two sets of parameters is 2.9 times different. From comparison, the filter based on the topological structure realizes the controllability of the notch bandwidth.
The embodiment of the application provides a filter 100, which comprises an input port 80, two short-circuit branches 10, a first open-circuit branch 20, a second open-circuit branch 30, a first parallel line 40, a second parallel line 50, a microstrip line 60 and an output port 70, wherein the first parallel line 40 and the second parallel line 50 are axially symmetrically arranged relative to the microstrip line 60, one short-circuit branch 10 is arranged at one end of the microstrip line 60, one short-circuit branch 10 is arranged at the other end of the microstrip line 60, the two short-circuit branches 10 are oppositely arranged, one end of the first open-circuit branch 20 is connected with the input port 80, one end of the second open-circuit branch 30 is connected with the output port 70, the first open-circuit branch 20 is parallel to the first parallel line 40, the second open-circuit branch 30 is parallel to the second parallel line 50, and the input port 80 is cascaded on the same straight line with the first parallel line 40, the microstrip line 60, the second parallel line 50 and the output port 70, and the filter 100 is formed by the filter with the characteristics of not being limited by the width of the filter.
The present application further provides a communication embodiment, where the communication device includes the above-mentioned filter 100, and the specific structure and function of the filter 100 may refer to the above-mentioned embodiment, which is not repeated herein.
The foregoing description is only exemplary embodiments of the present application and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (9)
1. A filter, comprising:
an input port;
two short circuit branches;
a first open-circuit stub;
a second open-circuit stub;
a first parallel line;
a second parallel line;
the microstrip line, the said first parallel line and second parallel line are symmetrical to the said microstrip line axis, a short circuit branch is set up in one end of the said microstrip line, a short circuit branch is set up in another end of the said microstrip line, and said two short circuit branches are set up relatively;
the output port, the one end of first branch of opening a way with the input port is connected, the one end of second branch of opening a way with the output port is connected, first branch of opening a way with first parallel line parallel arrangement, the second branch of opening a way with second parallel line parallel arrangement, and the input port with first parallel line, microstrip line, second parallel line and output port cascade are on same straight line.
2. The filter of claim 1, wherein the filter is configured to filter the filter,
the spacing distance between the first open circuit branch and the first parallel line is 0.68mm; the second open stub is spaced from the second parallel line by a distance of 0.68mm.
3. The filter of claim 1, wherein the filter is configured to filter the filter,
the two short circuit branches are symmetrically arranged relative to the microstrip line, and the two short circuit branches and the microstrip line are in an I-shaped structure.
4. The filter of claim 1, wherein the filter is configured to filter the filter,
the sum of the electrical length of the short circuit branch and one half of the electrical length of the microstrip line is a quarter wavelength corresponding to the center frequency of the filter.
5. The filter of claim 1, wherein the filter is configured to filter the filter,
the electrical length of the first open circuit branch and the electrical length of the second open circuit branch are both one quarter wavelength corresponding to the center frequency of the filter; the electrical length of the first parallel line and the electrical length of the second parallel line are each a quarter wavelength corresponding to the center frequency of the filter.
6. The filter of claim 1, wherein the filter is configured to filter the filter,
the first parallel line comprises a first transmission line and a second transmission line, one end of the first transmission line is connected with the microstrip line, one end of the second transmission line is connected with the input port, and the interval distance between the first open-circuit branch and the first transmission line is 0.65mm.
7. The filter of claim 1, wherein the filter is configured to filter the filter,
the second parallel line comprises a third transmission line and a fourth transmission line, one end of the third transmission line is connected with the microstrip line, one end of the fourth transmission line is connected with the output port, and the interval distance between the second open-circuit branch and the third transmission line is 0.65mm.
8. The filter of claim 7, wherein the filter is configured to filter the filter,
the width of the microstrip line is 1.9 to 2.1 times of the width of the short circuit branch.
9. A communication device comprising a filter according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322405988.7U CN220692296U (en) | 2023-09-04 | 2023-09-04 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322405988.7U CN220692296U (en) | 2023-09-04 | 2023-09-04 | Filter and communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220692296U true CN220692296U (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322405988.7U Active CN220692296U (en) | 2023-09-04 | 2023-09-04 | Filter and communication equipment |
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| Country | Link |
|---|---|
| CN (1) | CN220692296U (en) |
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2023
- 2023-09-04 CN CN202322405988.7U patent/CN220692296U/en active Active
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