CN220474867U - Topological structure of high-selectivity broadband band-stop filter and filter - Google Patents
Topological structure of high-selectivity broadband band-stop filter and filter Download PDFInfo
- Publication number
- CN220474867U CN220474867U CN202322402151.7U CN202322402151U CN220474867U CN 220474867 U CN220474867 U CN 220474867U CN 202322402151 U CN202322402151 U CN 202322402151U CN 220474867 U CN220474867 U CN 220474867U
- Authority
- CN
- China
- Prior art keywords
- microstrip line
- horizontal
- vertical
- open
- circuit branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims description 29
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012938 design process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a topological structure of a high-selectivity broadband band-stop filter and the filter, wherein the topological structure comprises a vertical microstrip line, one end of the vertical microstrip line is symmetrically connected with one end of a first horizontal open-circuit branch and one end of a second horizontal open-circuit branch, the other end of the vertical microstrip line is symmetrically connected with one end of the first horizontal microstrip line and one end of the second horizontal microstrip line, the other end of the first horizontal microstrip line is connected with an input end, and the other end of the second horizontal microstrip line is connected with an output end; a third horizontal microstrip line and a first vertical open-circuit branch are also connected between the first horizontal microstrip line and the input end, and a fourth horizontal microstrip line and a second vertical open-circuit branch are also connected between the second horizontal microstrip line and the output end; the third horizontal microstrip line and the fourth horizontal microstrip line are symmetrically distributed on two sides of the vertical microstrip line, and the first vertical open circuit branch and the second vertical open circuit branch are symmetrically distributed on two sides of the vertical microstrip line. The utility model solves the problems of complex structure, poor selectivity and narrow stop band of the existing band-stop filter.
Description
Technical Field
The utility model relates to the technical field of filters, in particular to a topological structure of a high-selectivity broadband band-stop filter and the filter.
Background
With the rapid development of modern wireless communication technology, the contradiction between the limited spectrum resources and the increasing information transmission demands is more and more intense, and various communication systems and communication modes are more and more approaching and even staggered in frequency space, which brings great challenges to the anti-interference capability of each communication system to other systems. In addition, the radio frequency device based on the microstrip structure has the advantages of low cost, small volume, low profile, light weight, easy integration and the like. Under the background, the high-selectivity research of the microstrip filter has extremely high scientific research and commercial value, and attracts attention of vast scholars and engineers. However, compared with the band-pass filter, the band-stop filter has few research results, and basically has the defects of poor selectivity, narrow stop band, complex topological structure and complex design process, so that the use of the band-stop filter in a modern wireless communication system is seriously influenced.
Disclosure of Invention
The utility model mainly aims to provide a topological structure of a high-selectivity broadband band-stop filter and the filter, and aims to solve the problems of complex structure, poor selectivity and narrow stop band of the conventional band-stop filter.
In order to achieve the above-mentioned purpose, the present utility model proposes a topology structure of a high-selectivity broadband band reject filter, comprising a vertical microstrip line, wherein one end of the vertical microstrip line is symmetrically connected with one end of a first horizontal open-circuit branch and one end of a second horizontal open-circuit branch, the other end of the vertical microstrip line is symmetrically connected with one end of the first horizontal microstrip line and one end of the second horizontal microstrip line, the other end of the first horizontal microstrip line is connected with an input end, and the other end of the second horizontal microstrip line is connected with an output end;
a third horizontal microstrip line and a first vertical open-circuit branch are also connected between the first horizontal microstrip line and the input end, and a fourth horizontal microstrip line and a second vertical open-circuit branch are also connected between the second horizontal microstrip line and the output end; the third horizontal microstrip line and the fourth horizontal microstrip line are symmetrically distributed on two sides of the vertical microstrip line, and the first vertical open-circuit branch and the second vertical open-circuit branch are symmetrically distributed on two sides of the vertical microstrip line.
Optionally, the electrical length of the vertical microstrip line, the electrical length of the first horizontal open circuit branch, the electrical length of the second horizontal open circuit branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are all the same.
Optionally, the electrical length of the vertical microstrip line, the electrical length of the first horizontal open circuit branch, the electrical length of the second horizontal open circuit branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are all set to be a corresponding quarter wavelength at the center frequency of the band stop filter.
Optionally, the sum of the electrical length of the third horizontal microstrip line and the electrical length of the first vertical open stub is set to a quarter wavelength corresponding to the center frequency of the band-stop filter, and the sum of the electrical length of the fourth horizontal microstrip line and the electrical length of the second vertical open stub is set to a quarter wavelength corresponding to the center frequency of the band-stop filter.
Optionally, the parameters of the topological structure include a characteristic impedance of the vertical microstrip line, a characteristic impedance of the first horizontal open circuit branch and a characteristic impedance of the second horizontal open circuit branch, a characteristic impedance of the first horizontal microstrip line and a characteristic impedance of the second horizontal microstrip line, a characteristic impedance of the third horizontal microstrip line and a characteristic impedance of the fourth horizontal microstrip line, a characteristic impedance of the first vertical open circuit branch and a characteristic impedance of the second vertical open circuit branch;
the characteristic impedance of the first horizontal open circuit branch is the same as the characteristic impedance of the second horizontal open circuit branch, the characteristic impedance of the first horizontal microstrip line is the same as the characteristic impedance of the second horizontal microstrip line, and the characteristic impedance of the third horizontal microstrip line, the characteristic impedance of the fourth horizontal microstrip line, the characteristic impedance of the first vertical open circuit branch and the characteristic impedance of the second vertical open circuit branch are the same.
Optionally, the topology includes three odd mode transmission poles, three even mode transmission poles, and three transmission zeroes.
In order to achieve the above objective, the present utility model further provides a filter, which includes any one of the above topological structure designed filters.
Optionally, the filter further includes a circuit board, where the dielectric constant of the circuit board is 3.38, the dielectric loss is 0.0022, and the thickness is 0.813mm.
Optionally, the circuit board size of the filter is 26.0mm by 11.0mm.
Optionally, the length of the vertical microstrip line is set to l 3 =9.35 mm, the width of the vertical microstrip line is set to w 3 =3.3 mm; the lengths of the first horizontal open-circuit branch and the second horizontal open-circuit branch are both set to l 4 =9.35 mm, all set to w 4 =0.9 mm; the lengths of the first horizontal microstrip line and the second horizontal microstrip line are all set to l 2 =9.35 mm, all set to w 2 =0.1 mm; the lengths of the third horizontal microstrip line and the fourth horizontal microstrip line are all set to l 1H =8.45 mm, all set to w 1 =0.1 mm; the lengths of the first vertical open-circuit branch and the second vertical open-circuit branch are both set to l 1V ＝0.9mm。
The utility model has the beneficial effects that: the topological structure of the existing band-stop filter is improved, the band-stop filter comprises a vertical microstrip line, one end of the vertical microstrip line is symmetrically connected with one end of a first horizontal open-circuit branch and one end of a second horizontal open-circuit branch, the other end of the vertical microstrip line is symmetrically connected with one end of the first horizontal microstrip line and one end of the second horizontal microstrip line, the other end of the first horizontal microstrip line is connected with an input end, and the other end of the second horizontal microstrip line is connected with an output end; a third horizontal microstrip line and a first vertical open-circuit branch are also connected between the first horizontal microstrip line and the input end, and a fourth horizontal microstrip line and a second vertical open-circuit branch are also connected between the second horizontal microstrip line and the output end; the third horizontal microstrip line and the fourth horizontal microstrip line are symmetrically distributed on two sides of the vertical microstrip line, and the first vertical open-circuit branch and the second vertical open-circuit branch are symmetrically distributed on two sides of the vertical microstrip line; the band-stop filter designed based on the topological structure has the advantages of high selectivity, bandwidth resistance and simple design process.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the topology of a filter of the present utility model;
FIG. 2 is a schematic diagram of an odd mode version of the topology of the present utility model;
FIG. 3 is a schematic diagram of an even mode version of the topology of the present utility model;
FIG. 4 is a topology-based filter layout of the present utility model;
FIG. 5 is a schematic diagram of the simulation result of the S parameter of the filter according to the present utility model;
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
An embodiment of the present utility model proposes a topology structure of a high-selectivity wideband band-stop filter, referring to fig. 1, including a vertical microstrip line, wherein one end of the vertical microstrip line is symmetrically connected with one end of a first horizontal open-circuit branch and one end of a second horizontal open-circuit branch, the other end of the vertical microstrip line is symmetrically connected with one end of the first horizontal microstrip line and one end of the second horizontal microstrip line, the other end of the first horizontal microstrip line is connected with an input end, and the other end of the second horizontal microstrip line is connected with an output end;
a third horizontal microstrip line and a first vertical open-circuit branch are also connected between the first horizontal microstrip line and the input end, and a fourth horizontal microstrip line and a second vertical open-circuit branch are also connected between the second horizontal microstrip line and the output end; the third horizontal microstrip line and the fourth horizontal microstrip line are symmetrically distributed on two sides of the vertical microstrip line, and the first vertical open-circuit branch and the second vertical open-circuit branch are symmetrically distributed on two sides of the vertical microstrip line.
In this embodiment, the topology structure adopts a bilateral symmetry structure, and uses a vertical microstrip line as a central axis, a first horizontal open-circuit branch and a second horizontal open-circuit branch are symmetrical, the first horizontal microstrip line and the second horizontal microstrip line are symmetrical, a third horizontal microstrip line and a fourth horizontal microstrip line are symmetrical, and the first vertical open-circuit branch and the second vertical open-circuit branch are symmetrical;
further, the electrical length of the vertical microstrip line, the electrical length of the first horizontal open circuit branch, the electrical length of the second horizontal open circuit branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are all the same. In this embodiment, the electrical length of the vertical microstrip line, the electrical length of the first horizontal open branch, the electrical length of the second horizontal open branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are all set to be a quarter wavelength corresponding to the center frequency of the band stop filter.
Further, the sum of the electrical length of the third horizontal microstrip line and the electrical length of the first vertical open branch is set to a quarter wavelength corresponding to the center frequency of the band-stop filter, and the sum of the electrical length of the fourth horizontal microstrip line and the electrical length of the second vertical open branch is set to a quarter wavelength corresponding to the center frequency of the band-stop filter.
Further, the characteristic impedance of the first horizontal open circuit branch is the same as the characteristic impedance of the second horizontal open circuit branch, the characteristic impedance of the first horizontal microstrip line is the same as the characteristic impedance of the second horizontal microstrip line, and the characteristic impedance of the third horizontal microstrip line, the characteristic impedance of the fourth horizontal microstrip line, the characteristic impedance of the first vertical open circuit branch and the characteristic impedance of the second vertical open circuit branch are the same;
in this embodiment, for the upper half of the topology, the characteristic impedance of the first and second horizontal open branches is the same as Z 4 The characteristic impedance of the vertical microstrip line is Z 3 The method comprises the steps of carrying out a first treatment on the surface of the For the followingThe characteristic impedance of the first horizontal microstrip line and the second horizontal microstrip line is the same as Z 2 The characteristic impedance of the third horizontal microstrip line, the fourth horizontal microstrip line, the first vertical open circuit branch and the second vertical open circuit branch is Z 1 。
Further, the topology structure comprises three odd-mode transmission poles, three even-mode transmission poles and three transmission zeros. In this embodiment, since the topology is a symmetrical structure, the transmission pole can be analyzed by parity-mode, specifically referring to fig. 2, when Y ino When the phase is = ≡, it can be obtained that the topology structure has three odd mode transmission poles, which are respectively:
f op1 ＝0
f op3 ＝π
referring to FIG. 3, when Y ino When the phase is = ≡, it can be obtained that the topology structure has three even mode transmission poles, which are respectively:
for this topology, its transmission zero can be calculated by: sequentially multiplying the ABCD matrixes of the cascade resonators forming the topological structure to obtain an ABCD matrix corresponding to the topological structure; the ABCD matrix for this topology is converted to a corresponding S matrix. When |S 21 When r=0, it can be obtained that the topology has three transmission zeros, respectively:
from the above analysis, the topology structure has three odd mode transmission poles, three even mode transmission poles and three transmission zeros. And no matter the parameter Z 1 、Z 2 、Z 3 、Z 4 How the values of these transmission zero poles change, i.e. f op1 <f ep1 <f z1 <f op2 ＝fz2<f z3 <f ep2 <f op3 <fep3 is unchanged. In addition, according to the characteristics of the radio frequency filter, when the positions of the transmission zero and the transmission pole coincide, only the characteristics of the transmission zero are displayed. Therefore, the radio frequency filter designed based on the topological structure can only be a band stop filter, three transmission zero points are arranged in the stop band, two transmission poles are arranged in the lower pass band, and three transmission poles are arranged in the upper pass band.
The stopband bandwidth of the band-stop filter designed based on the topological structure is mainly determined by the ratio of the characteristic impedance Z3 to the characteristic impedance Z4. Characteristic impedance Z 3 And Z 4 The larger the ratio of (c) the larger the stopband bandwidth. The isolation of the stop band and the reflection coefficient of the pass band are mainly Z3 and Z 4 Is determined by the value of (2). Z is Z 3 And Z 4 The smaller the value of (c), the higher the isolation of the stop band, and the smaller the reflection coefficient of the pass band.
Another embodiment of the present utility model further provides a filter including any one of the above-described topologically designed filters. The filter also included a circuit board having a dielectric constant of 3.38, a dielectric loss of 0.0022, and a thickness of 0.813mm. The size of the circuit board of the filter is 26.0mm by 11.0mm.
Further, referring to fig. 4, the length of the vertical microstrip line is set to l 3 =9.35 mm, the width of the vertical microstrip line is set to w 3 =3.3 mm; the lengths of the first horizontal open-circuit branch and the second horizontal open-circuit branch are both set to l 4 =9.35 mm, all set to w 4 =0.9 mm; the lengths of the first horizontal microstrip line and the second horizontal microstrip line are all set to l 2 =9.35 mm, all set to w 2 =0.1 mm; the lengths of the third horizontal microstrip line and the fourth horizontal microstrip line are all set to l 1H =8.45 mm, all set to w 1 =0.1 mm; the lengths of the first vertical open-circuit branch and the second vertical open-circuit branch are both set to l 1V ＝0.9mm。
Based on the above design, the S-parameter simulation result of the filter in this embodiment is shown in fig. 5, where the range of the stop band bandwidth with the isolation greater than 20dB is 2.233GHz to 8.075GHz, the stop band center frequency is 5.154GHz, the stop band absolute bandwidth is 5.842GHz, and the stop band relative bandwidth is 113.3%. In addition, three transmission zeros are arranged in the stop band and are respectively positioned at 2.762,5.028 and 7.845GHz; five transmission poles are located in the passband, and are respectively located at 0,0.903,8.868,9.769 and 10.901GHz. The three transmission zeroes and the five transmission poles ensure not only the high isolation characteristic of the stop band and the low insertion loss and flatness of the pass band, but also the high selection characteristic of the sidebands of the band-stop filter.
The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. The topological structure of the high-selectivity broadband band-stop filter is characterized by comprising a vertical microstrip line, wherein one end of the vertical microstrip line is symmetrically connected with one end of a first horizontal open-circuit branch and one end of a second horizontal open-circuit branch, the other end of the vertical microstrip line is symmetrically connected with one end of the first horizontal microstrip line and one end of the second horizontal microstrip line, the other end of the first horizontal microstrip line is connected with an input end, and the other end of the second horizontal microstrip line is connected with an output end;
a third horizontal microstrip line and a first vertical open-circuit branch are also connected between the first horizontal microstrip line and the input end, and a fourth horizontal microstrip line and a second vertical open-circuit branch are also connected between the second horizontal microstrip line and the output end; the third horizontal microstrip line and the fourth horizontal microstrip line are symmetrically distributed on two sides of the vertical microstrip line, and the first vertical open-circuit branch and the second vertical open-circuit branch are symmetrically distributed on two sides of the vertical microstrip line.
2. The topology of the high selectivity wideband band reject filter of claim 1, wherein the electrical length of the vertical microstrip line, the electrical length of the first horizontal open branch, the electrical length of the second horizontal open branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are all the same.
3. The topology of the high selectivity wideband band reject filter of claim 2, wherein the electrical length of the vertical microstrip line, the electrical length of the first horizontal open branch, the electrical length of the second horizontal open branch, the electrical length of the first horizontal microstrip line, and the electrical length of the second horizontal microstrip line are each set to a corresponding quarter wavelength at a center frequency of the band reject filter.
4. The topology of a high selectivity wideband bandstop filter of claim 1, wherein a sum of an electrical length of the third horizontal microstrip line and an electrical length of the first vertical open branch is set to a corresponding quarter wavelength at a bandstop filter center frequency, and a sum of an electrical length of the fourth horizontal microstrip line and an electrical length of the second vertical open branch is set to a corresponding quarter wavelength at a bandstop filter center frequency.
5. The topology of the high selectivity broadband band reject filter of claim 1, wherein the parameters of the topology include a characteristic impedance of the vertical microstrip line, a characteristic impedance of the first horizontal open circuit branch and a characteristic impedance of the second horizontal open circuit branch, a characteristic impedance of the first horizontal microstrip line and a characteristic impedance of the second horizontal microstrip line, a characteristic impedance of the third horizontal microstrip line and a characteristic impedance of the fourth horizontal microstrip line, a characteristic impedance of the first vertical open circuit branch and a characteristic impedance of the second vertical open circuit branch;
the characteristic impedance of the first horizontal open circuit branch is the same as the characteristic impedance of the second horizontal open circuit branch, the characteristic impedance of the first horizontal microstrip line is the same as the characteristic impedance of the second horizontal microstrip line, and the characteristic impedance of the third horizontal microstrip line, the characteristic impedance of the fourth horizontal microstrip line, the characteristic impedance of the first vertical open circuit branch and the characteristic impedance of the second vertical open circuit branch are the same.
6. The topology of a high selectivity wideband bandstop filter of claim 1, wherein the topology comprises three odd mode transmission poles, three even mode transmission poles, three transmission zeroes.
7. A filter comprising a topologically designed filter as claimed in any one of claims 1 to 6.
8. The filter of claim 7, further comprising a circuit board having a dielectric constant of 3.38, a dielectric loss of 0.0022, and a thickness of 0.813mm.
9. The filter of claim 8, wherein the filter has a circuit board size of 26.0mm by 11.0mm.
10. The filter of claim 7Characterized in that the length of the vertical microstrip line is set as l 3 =9.35 mm, the width of the vertical microstrip line is set to w 3 =3.3 mm; the lengths of the first horizontal open-circuit branch and the second horizontal open-circuit branch are both set to l 4 =9.35 mm, all set to w 4 =0.9 mm; the lengths of the first horizontal microstrip line and the second horizontal microstrip line are all set to l 2 =9.35 mm, all set to w 2 =0.1 mm; the lengths of the third horizontal microstrip line and the fourth horizontal microstrip line are all set to l 1H =8.45 mm, all set to w 1 =0.1 mm; the lengths of the first vertical open-circuit branch and the second vertical open-circuit branch are both set to l 1V ＝0.9mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322402151.7U CN220474867U (en) | 2023-08-31 | 2023-08-31 | Topological structure of high-selectivity broadband band-stop filter and filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322402151.7U CN220474867U (en) | 2023-08-31 | 2023-08-31 | Topological structure of high-selectivity broadband band-stop filter and filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220474867U true CN220474867U (en) | 2024-02-09 |
Family
ID=89779568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322402151.7U Active CN220474867U (en) | 2023-08-31 | 2023-08-31 | Topological structure of high-selectivity broadband band-stop filter and filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220474867U (en) |
-
2023
- 2023-08-31 CN CN202322402151.7U patent/CN220474867U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Qiu et al. | Balanced bandpass filter using stub-loaded ring resonator and loaded coupled feed-line | |
| CN104319435A (en) | Substrate integrated waveguide band-pass filter applied onto WLAN (wireless local area network) system | |
| CN105489984A (en) | Fractal defected structured quarter-mode substrate integrated waveguide bandpass filter | |
| Ouyang et al. | Wideband balanced filters with intrinsic common-mode suppression on coplanar stripline-based multimode resonators | |
| CN204130666U (en) | A kind of substrate integration wave-guide band pass filter being applied to wlan system | |
| CN108428979A (en) | A kind of microstrip bandpass filter and its design method | |
| CN117317551A (en) | Filter and communication equipment | |
| CN220474867U (en) | Topological structure of high-selectivity broadband band-stop filter and filter | |
| CN111463527A (en) | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method | |
| CN117199749A (en) | Topological structure of high-selectivity broadband band-stop filter and filter | |
| CN220895818U (en) | Topological structure of small-sized high-selectivity broadband band-stop filter and filter | |
| CN113140882B (en) | Miniaturized filtering crossing directional coupler | |
| Johnson et al. | Pedestal substrate integrated waveguide filter with both electric and magnetic cross-couplings | |
| CN104882653B (en) | A kind of balance filter of use modified coupling feed | |
| CN105449326B (en) | The microwave filter and its design method of the wide suppression of high selectivity | |
| CN220628194U (en) | Topological structure of compact type wide passband filter and filter | |
| CN117154362A (en) | Topological structure of small-sized high-selectivity broadband band-stop filter and filter | |
| CN220797045U (en) | Topological structure of dual-passband filter with small center frequency ratio and filter | |
| CN113435147A (en) | Lumped parameter type negative group delay circuit and chip | |
| CN220895819U (en) | Topological structure of broadband band-stop filter with narrow pass characteristic and filter | |
| CN220963707U (en) | Topological structure, band elimination filter and communication equipment | |
| CN220984830U (en) | Low-pass filter and communication equipment | |
| CN220964838U (en) | Topological structure, filter and communication equipment | |
| CN111224207A (en) | Broadband power divider | |
| CN221102374U (en) | Wide double-passband filter based on parallel five lines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |