CN216750251U - Microstrip low-pass filter - Google Patents
Microstrip low-pass filter Download PDFInfo
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- CN216750251U CN216750251U CN202220362394.5U CN202220362394U CN216750251U CN 216750251 U CN216750251 U CN 216750251U CN 202220362394 U CN202220362394 U CN 202220362394U CN 216750251 U CN216750251 U CN 216750251U
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- pass filter
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Abstract
The utility model provides a microstrip low-pass filter, which comprises a cavity, a circuit board, a first connector and a second connector, wherein the first connector is arranged at one end of the circuit board, the second connector is arranged at the other end of the circuit board, the circuit board is arranged in the cavity and comprises a dielectric plate, a high-low impedance line and an open circuit stub set, the high-low impedance line and the open circuit stub set are arranged on one surface of the dielectric plate, the high-low impedance line comprises a first low impedance line, a high impedance line and a second low impedance line which are sequentially connected from one end to the other end of the circuit board, and the open circuit stub set comprises a plurality of open circuit stubs which are connected with the high impedance line and are arranged at intervals. Therefore, the high-low impedance line and the open-circuit stub line are combined, the width of the stop band can be adjusted by adjusting the width of the high-low impedance line, and the stop band has a better rectangular coefficient and can simultaneously meet the characteristics of small volume, high suppression degree and wide stop band.
Description
Technical Field
The utility model relates to the field of filters, in particular to a microstrip low-pass filter.
Background
At present, the frequency of a common plane microstrip structure low-pass filter stop band is 1.5 to 2 times, the suppression degree is not high, the number of stages must be increased for the common plane microstrip structure low-pass filter stop band to have a high suppression degree and a smaller rectangular coefficient, so that the size of a product is increased, and the common plane microstrip structure low-pass filter stop band is difficult to simultaneously meet the characteristics of small size, high suppression degree, wide stop band and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve one of the above technical problems, the present invention proposes the following technical solutions.
The embodiment of the utility model provides a microstrip low-pass filter, which comprises a cavity, a circuit board, a first connector and a second connector, wherein the first connector is arranged at one end of the circuit board, the second connector is arranged at the other end of the circuit board, the circuit board is arranged in the cavity, the circuit board comprises a dielectric plate, a high-low impedance line and an open-circuit stub set, the high-low impedance line is arranged on one surface of the dielectric plate, the high-low impedance line comprises a first low impedance line, a high-impedance line and a second low impedance line which are sequentially connected from one end to the other end of the circuit board, and the open-circuit stub set comprises a plurality of open-circuit stubs which are connected with the high-impedance line and are arranged at intervals.
In addition, the microstrip low-pass filter according to the above embodiment of the present invention may have the following additional technical features.
In some examples, the high impedance lines are straight lines, and each of the open stubs is perpendicular to the high impedance lines.
In some examples, the set of open stubs includes open stubs connected to the center position of the high impedance line, nine open stubs located at one side of the center position of the high impedance line, and nine open stubs located at the other side of the center position of the high impedance line, wherein the nine open stubs located at one side of the center position of the high impedance line are symmetrical to the nine open stubs located at the other side.
In some examples, the nine open stubs on either side of the center position of the high-impedance line have different widths and different lengths.
In some examples, among the nine open stubs on either side of the center position of the high-impedance line, the three open stubs adjacent to the center position of the high-impedance line each have a width smaller than the six open stubs away from the center position of the high-impedance line.
In some examples, of the nine open stubs on either side of the center position of the high-impedance line, the three open stubs adjacent to the center position of the high-impedance line each have a length greater than the six open stubs away from the center position of the high-impedance line.
In some examples, the first low impedance line and the second low impedance line are each a meander line.
In some examples, the connector is an SMA-K connector.
In some examples, the first low impedance line, the high impedance line, the second low impedance line, and each of the open stubs are made of copper foil.
According to the technical scheme of the embodiment of the utility model, the high-low impedance line and the open-circuit stub line are combined, so that the width of the stop band can be adjusted by adjusting the width of the high-low impedance line, the stop band has a better rectangular coefficient, and the characteristics of small volume, high rejection degree and wide stop band can be simultaneously met.
Drawings
Fig. 1 is an internal top view of a microstrip low pass filter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Fig. 1 is an internal top view of a microstrip low pass filter according to an embodiment of the present invention.
As shown in fig. 1, the microstrip low pass filter includes: the cavity 1, the circuit board 2, first connector 3 and second connector 4, first connector 3 sets up in the one end of circuit board 2, second connector 4 sets up in the other end of circuit board 2, circuit board 2 sets up in cavity 1, circuit board 2 includes dielectric plate 21, set up in the high-low impedance line 22 and the short section group 23 of opening a way of dielectric plate one side, high-low impedance line 22 includes the first low impedance line 221, high impedance line 222 and the second low impedance line 223 that connect gradually from one end to the other end of circuit board 2, short section group 23 of opening a way includes a plurality of short section lines of opening a way that link to each other and interval arrangement with high impedance line 22.
Wherein the first connector 3 and the second connector 4 are SMA-K connectors.
It should be noted that the first connector 3 and the second connector 4 may be correspondingly disposed at the centers of the two sides of the filter, and at this time, the first low impedance line 221 and the second low impedance line 223 are both broken lines for connecting the high impedance line 222 with the connectors.
Specifically, the embodiment of the utility model selects a microstrip form to realize the microstrip low-pass filter by analyzing the electrical performance requirement and the overall dimension requirement, adopts a mixed structure of a high-low impedance line and an open-circuit stub line, can adjust the width of a stop band by adjusting the width of the high-low impedance line, and has better rectangular coefficient.
Referring to fig. 1, the microstrip low-pass filter is attached through four attachment screw holes 5.
Therefore, the microstrip low-pass filter provided by the embodiment of the utility model can adjust the width of the stop band by adjusting the width of the high-low impedance line, has a better rectangular coefficient, and can simultaneously meet the characteristics of small volume, high rejection degree and wide stop band.
In one example of the present invention, as shown in fig. 1, the high-impedance lines 222 are straight lines, and each open stub is perpendicular to the high-impedance lines 222.
Referring to fig. 1, the open stub group 23 includes open stubs connected to the center of the high impedance line 222, nine open stubs (the first to ninth open stubs from left to right in the drawing) located on one side of the center of the high impedance line 222, and nine open stubs (the eleventh to nineteenth stubs from left to right in the drawing) located on the other side of the center of the high impedance line 222, wherein the nine open stubs located on one side of the center of the high impedance line 222 are symmetrical to the nine open stubs on the other side.
Further, the nine open stubs on either side of the center position of the high impedance line 222 are different in width and length.
That is, the first to ninth open stubs and the eleventh to nineteenth stubs are axisymmetrical with respect to a straight line on which the open stub (may also be referred to as a tenth open stub) is located. Regarding the length and width of the open stub, the first open stub is the same as the nineteenth open stub, the second open stub is the same as the eighteenth open stub, the third open stub is the same as the seventeenth open stub, the fourth open stub is the same as the sixteenth open stub, the fifth open stub is the same as the fifteenth open stub, the sixth open stub is the same as the fourteenth open stub, the seventh open stub is the same as the thirteenth open stub, the eighth open stub is the same as the twelfth open stub, and the ninth open stub is the same as the eleventh open stub.
In one example of the present invention, referring to fig. 1, among nine open stubs on either side of the center position of the high-impedance line 222, the widths of three open stubs adjacent to the center position of the high-impedance line 222 are each smaller than the widths of six open stubs away from the center position of the high-impedance line 222.
Of the nine open stubs on either side of the center position of the high-impedance line 222, the three open stubs adjacent to the center position of the high-impedance line 222 each have a length greater than the six open stubs remote from the center position of the high-impedance line 222.
Specifically, the microstrip low-pass filter designed by the above example can obtain the microstrip low-pass filter with the cutoff frequency of 6.0GHz, the suppression degree of 70dB in the frequency band of 7.5GHz-20GHz, the loss in the pass band of less than 2.0dB and the standing-wave ratio of less than 1.2.
In summary, the microstrip low-pass filter according to the embodiment of the present invention has these advantages: the parasitic band is far, the structure is compact, the rectangular coefficient is good, the processing is easy, the width of the high and low impedance line can be adjusted to adjust the width of the stop band like the high and low impedance line, and the parasitic band has a good rectangular coefficient like the open circuit stub structure.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The utility model provides a microstrip low pass filter, its characterized in that, includes cavity, circuit board, first connector and second connector, first connector set up in the one end of circuit board, the second connector set up in the other end of circuit board, the circuit board set up in the cavity, the circuit board include the dielectric plate, set up in the high-low impedance line and the short section group of opening a way of dielectric plate one side, the high-low impedance line include certainly first low impedance line, high impedance line and the second low impedance line that one end to the other end of circuit board connected gradually, the short section group of opening a way include a plurality of with the high impedance line links to each other and interval arrangement's short section line of opening a way.
2. The microstrip low pass filter according to claim 1, wherein the high impedance lines are straight lines, and each of the open stubs is perpendicular to the high impedance lines.
3. The microstrip low pass filter according to claim 2, wherein the set of open stubs includes open stubs connected to the center positions of the high impedance lines, nine open stubs located on one side of the center positions of the high impedance lines, and nine open stubs located on the other side of the center positions of the high impedance lines, wherein the nine open stubs located on one side of the center positions of the high impedance lines are symmetrical to the nine open stubs located on the other side.
4. The microstrip low-pass filter according to claim 3, wherein nine open stubs on either side of the center position of the high-impedance line are different in width and length.
5. The microstrip low-pass filter according to claim 4, wherein among nine open stubs on either side of the center position of the high impedance line, the widths of three open stubs adjacent to the center position of the high impedance line are each smaller than the widths of six open stubs remote from the center position of the high impedance line.
6. The microstrip low-pass filter according to claim 5, wherein among nine open stubs on either side of the center position of the high impedance line, the lengths of three open stubs adjacent to the center position of the high impedance line are each larger than the lengths of six open stubs remote from the center position of the high impedance line.
7. The microstrip low pass filter according to any of claims 1-6, wherein the first low impedance line and the second low impedance line are each meander lines.
8. The microstrip low pass filter according to claim 7 wherein the connector is an SMA-K connector.
9. The microstrip low-pass filter according to claim 8, wherein the first low impedance line, the high impedance line, the second low impedance line and each of the open stubs are made of copper foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362394.5U CN216750251U (en) | 2022-02-22 | 2022-02-22 | Microstrip low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362394.5U CN216750251U (en) | 2022-02-22 | 2022-02-22 | Microstrip low-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216750251U true CN216750251U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220362394.5U Active CN216750251U (en) | 2022-02-22 | 2022-02-22 | Microstrip low-pass filter |
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| Country | Link |
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| CN (1) | CN216750251U (en) |
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- 2022-02-22 CN CN202220362394.5U patent/CN216750251U/en active Active
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