CN221239780U - Topological structure of high-selectivity compact ultra-wideband filter and filter - Google Patents

Topological structure of high-selectivity compact ultra-wideband filter and filter Download PDF

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Publication number
CN221239780U
CN221239780U CN202322883966.1U CN202322883966U CN221239780U CN 221239780 U CN221239780 U CN 221239780U CN 202322883966 U CN202322883966 U CN 202322883966U CN 221239780 U CN221239780 U CN 221239780U
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microstrip line
open
electrical length
line
circuit branch
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毕晓坤
杨椰楠
徐雨
谷媛
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Shenzhen Sunway Communication Co Ltd
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Shenzhen Sunway Communication Co Ltd
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Abstract

The utility model discloses a topological structure of a high-selectivity compact ultra-wideband filter and the filter, comprising a first parallel three-wire and a second parallel three-wire which are connected with each other, wherein the first parallel three-wire and the second parallel three-wire are distributed along a first direction; a first microstrip line and a second microstrip line are symmetrically connected between the first parallel three lines and the second parallel three lines, and are distributed along a second direction; the first microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, the third microstrip line is sequentially connected with a seventh microstrip line and a first open-circuit branch knot, and the fourth microstrip line is sequentially connected with an eighth microstrip line and a second open-circuit branch knot; the second microstrip line is symmetrically connected with a fifth microstrip line and a sixth microstrip line, the fifth microstrip line is sequentially connected with a ninth microstrip line and a third open-circuit branch, and the sixth microstrip line is sequentially connected with a tenth microstrip line and a fourth open-circuit branch; the utility model solves the defect of larger size of the existing high-selectivity ultra-wideband filter.

Description

Topological structure of high-selectivity compact ultra-wideband filter and filter
Technical Field
The utility model relates to the technical field of filters, in particular to a topological structure of a high-selectivity compact ultra-wideband filter and the filter.
Background
With the rapid development of modern 5G communication technology, ultra-wideband systems with high data transmission rate, strong anti-interference capability and low power consumption attract more and more engineers and students' attention. The research of ultra wideband filters, which are one of the key devices thereof, with high selectivity and miniaturization has great scientific and commercial value. However, existing high selectivity ultra wideband filters tend to have large size drawbacks that limit their use in modern small wireless communication systems.
Disclosure of utility model
The utility model mainly aims to provide a topological structure of a high-selectivity compact ultra-wideband filter and the filter, and aims to solve the defect of larger size of the existing high-selectivity ultra-wideband filter.
In order to achieve the above purpose, the present utility model provides a topology structure of a high-selectivity compact ultra-wideband filter, which comprises a first parallel three line and a second parallel three line which are connected with each other, wherein the first parallel three line and the second parallel three line are arranged along a first direction, the other end of the first parallel three line is connected with an input end, and the other end of the second parallel three line is connected with an output end;
A first microstrip line and a second microstrip line are symmetrically connected between the first parallel three lines and the second parallel three lines, and are arranged along a second direction, and the second direction is perpendicular to the first direction;
The other end of the first microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, the other end of the third microstrip line is sequentially connected with a seventh microstrip line and a first open circuit branch, and the other end of the fourth microstrip line is sequentially connected with an eighth microstrip line and a second open circuit branch; the third microstrip line, the fourth microstrip line, the first open circuit branch and the second open circuit branch are all arranged along the first direction, and the seventh microstrip line and the eighth microstrip line are all arranged along the second direction; the third microstrip line, the fourth microstrip line, the seventh microstrip line, the eighth microstrip line, the first open circuit branch and the second open circuit branch are symmetrical with respect to the first microstrip line;
the other end of the second microstrip line is symmetrically connected with a fifth microstrip line and a sixth microstrip line, the other end of the fifth microstrip line is sequentially connected with a ninth microstrip line and a third open circuit branch, and the other end of the sixth microstrip line is sequentially connected with a tenth microstrip line and a fourth open circuit branch; the fifth microstrip line, the sixth microstrip line, the third open-circuit branch and the fourth open-circuit branch are all arranged along the first direction, and the ninth microstrip line and the tenth microstrip line are all arranged along the second direction; the fifth microstrip line and the sixth microstrip line, the ninth microstrip line and the tenth microstrip line, and the third open-circuit branch and the fourth open-circuit branch are symmetrical with respect to the second microstrip line;
The third microstrip line and the fifth microstrip line, the seventh microstrip line and the ninth microstrip line, the first open-circuit branch and the third open-circuit branch are symmetrical about the first parallel three-wire; the fourth and sixth microstrip lines, the eighth and tenth microstrip lines, the second and fourth open-circuit branches are all symmetrical about the second parallel three-wire.
Optionally, the electrical length of the first parallel three lines and the electrical length of the second parallel three lines are each a quarter wavelength corresponding to the center frequency of the filter.
Optionally, the electrical length of the first microstrip line is equal to the electrical length of the second microstrip line; the electrical length of the third microstrip line, the electrical length of the fourth microstrip line, the electrical length of the fifth microstrip line and the electrical length of the sixth microstrip line are all equal; the electrical length of the seventh microstrip line, the electrical length of the eighth microstrip line, the electrical length of the ninth microstrip line, and the electrical length of the tenth microstrip line are all equal; the electrical length of the first open circuit branch, the electrical length of the second open circuit branch, the electrical length of the third open circuit branch and the electrical length of the fourth open circuit branch are all equal.
Optionally, the sum of the electrical length of the first microstrip line, the electrical length of the third microstrip line, the electrical length of the seventh microstrip line and the electrical length of the first open branch is one half wavelength corresponding to the filter center frequency; the sum of the electrical length of the first microstrip line, the electrical length of the fourth microstrip line, the electrical length of the eighth microstrip line and the electrical length of the second open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the fifth microstrip line, the electrical length of the ninth microstrip line and the electrical length of the third open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the sixth microstrip line, the electrical length of the tenth microstrip line and the electrical length of the fourth circuit branch is one half wavelength corresponding to the center frequency of the filter.
Optionally, the characteristic impedance of the third microstrip line, the characteristic impedance of the fourth microstrip line, the characteristic impedance of the fifth microstrip line, the characteristic impedance of the sixth microstrip line, the characteristic impedance of the seventh microstrip line, the characteristic impedance of the eighth microstrip line, the characteristic impedance of the ninth microstrip line, the characteristic impedance of the tenth microstrip line, the characteristic impedance of the first open branch, the characteristic impedance of the second open branch, the characteristic impedance of the third open branch, and the characteristic impedance of the fourth open branch are equal and are twice the characteristic impedance of the first microstrip line and the characteristic impedance of the second microstrip line.
Optionally, the first parallel three-wire and the second parallel three-wire each include a first transmission line, a second transmission line and a third transmission line that are parallel to each other, the second transmission line is located between the first transmission line and the third transmission line, the second transmission line is used for being connected with the input end or the output end, and the first transmission line and the third transmission line are respectively used for being connected with the first microstrip line and the second microstrip line.
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 loss of the circuit board is 0.0022, the thickness of the circuit board is 0.813mm, and the size of the circuit board is 19.5mm x 8.8mm.
Optionally, the line width of the transmission line in the first parallel three line and the second parallel three line is set to w p =0.5 mm, the line length is set to s p =0.15 mm, and the line length is set to l p =7.35 mm.
Optionally, the sum of the lengths of the first microstrip line and the second microstrip line is l 1 =7.4 mm, and the width of the first microstrip line and the width of the second microstrip line are both w 1 =0.8 mm; the length of the third microstrip line, the length of the fourth microstrip line, the length of the fifth microstrip line and the length of the sixth microstrip line are all set to l 2 =7.1 mm, and the width of the third microstrip line, the width of the fourth microstrip line, the width of the fifth microstrip line, the width of the sixth microstrip line, the width of the seventh microstrip line, the width of the eighth microstrip line, the width of the ninth microstrip line, the width of the tenth microstrip line, the width of the first open-circuit branch, the width of the second open-circuit branch, the width of the third open-circuit branch and the width of the fourth open-circuit branch are all set to w 2 =0.4 mm; the length of the seventh microstrip line, the length of the eighth microstrip line, the length of the ninth microstrip line and the length of the tenth microstrip line are all set to be l 3 = 1.1mm; the length of the first open circuit branch, the length of the second open circuit branch, the length of the third open circuit branch and the length of the fourth open circuit branch are all set to be l 4 =5.35 mm.
The utility model has the beneficial effects that: the topological structure of the existing high-selectivity ultra-wideband filter is improved, the ultra-wideband filter comprises a first parallel three wire and a second parallel three wire which are connected with each other, and the first parallel three wire and the second parallel three wire are distributed along a first direction; a first microstrip line and a second microstrip line are symmetrically connected between the first parallel three lines and the second parallel three lines, and are arranged along a second direction, and the second direction is perpendicular to the first direction; the other end of the first microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, the other end of the third microstrip line is sequentially connected with a seventh microstrip line and a first open circuit branch, and the other end of the fourth microstrip line is sequentially connected with an eighth microstrip line and a second open circuit branch; the third microstrip line, the fourth microstrip line, the first open circuit branch and the second open circuit branch are all arranged along the first direction, and the seventh microstrip line and the eighth microstrip line are all arranged along the second direction; the third microstrip line, the fourth microstrip line, the seventh microstrip line, the eighth microstrip line, the first open circuit branch and the second open circuit branch are symmetrical with respect to the first microstrip line; the other end of the second microstrip line is symmetrically connected with a fifth microstrip line and a sixth microstrip line, the other end of the fifth microstrip line is sequentially connected with a ninth microstrip line and a third open circuit branch, and the other end of the sixth microstrip line is sequentially connected with a tenth microstrip line and a fourth open circuit branch; the fifth microstrip line, the sixth microstrip line, the third open-circuit branch and the fourth open-circuit branch are all arranged along the first direction, and the ninth microstrip line and the tenth microstrip line are all arranged along the second direction; the fifth microstrip line and the sixth microstrip line, the ninth microstrip line and the tenth microstrip line, and the third open-circuit branch and the fourth open-circuit branch are symmetrical with respect to the second microstrip line; the filter designed based on the topological structure has the advantages of high selectivity and miniaturization.
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 layout of a filter of the present utility model;
FIG. 3 is a graph showing the variation of S-parameter simulation results of the filter according to the present utility model with different S P;
FIG. 4 is a graph showing the variation of the S-parameter simulation result of the filter according to the present utility model with different w P;
FIG. 5 is a graph showing the variation of the S-parameter simulation result of the filter according to the present utility model with different w 1;
FIG. 6 is a schematic diagram of S-parameter simulation results of the filter of 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 compact ultra-wideband filter, referring to fig. 1, including a first parallel three-wire and a second parallel three-wire that are connected to each other, where the first parallel three-wire and the second parallel three-wire are arranged along a first direction, another end of the first parallel three-wire is connected with an input end, and another end of the second parallel three-wire is connected with an output end;
A first microstrip line and a second microstrip line are symmetrically connected between the first parallel three lines and the second parallel three lines, and are arranged along a second direction, and the second direction is perpendicular to the first direction;
The other end of the first microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, the other end of the third microstrip line is sequentially connected with a seventh microstrip line and a first open circuit branch, and the other end of the fourth microstrip line is sequentially connected with an eighth microstrip line and a second open circuit branch; the third microstrip line, the fourth microstrip line, the first open circuit branch and the second open circuit branch are all arranged along the first direction, and the seventh microstrip line and the eighth microstrip line are all arranged along the second direction; the third microstrip line, the fourth microstrip line, the seventh microstrip line, the eighth microstrip line, the first open circuit branch and the second open circuit branch are symmetrical with respect to the first microstrip line;
the other end of the second microstrip line is symmetrically connected with a fifth microstrip line and a sixth microstrip line, the other end of the fifth microstrip line is sequentially connected with a ninth microstrip line and a third open circuit branch, and the other end of the sixth microstrip line is sequentially connected with a tenth microstrip line and a fourth open circuit branch; the fifth microstrip line, the sixth microstrip line, the third open-circuit branch and the fourth open-circuit branch are all arranged along the first direction, and the ninth microstrip line and the tenth microstrip line are all arranged along the second direction; the fifth microstrip line and the sixth microstrip line, the ninth microstrip line and the tenth microstrip line, and the third open-circuit branch and the fourth open-circuit branch are symmetrical with respect to the second microstrip line;
The third microstrip line and the fifth microstrip line, the seventh microstrip line and the ninth microstrip line, the first open-circuit branch and the third open-circuit branch are symmetrical about the first parallel three-wire; the fourth and sixth microstrip lines, the eighth and tenth microstrip lines, the second and fourth open-circuit branches are all symmetrical about the second parallel three-wire.
Further, the electrical length of the first parallel three lines and the electrical length of the second parallel three lines are each a quarter wavelength corresponding to the center frequency of the filter.
Further, the electrical length of the first microstrip line is equal to the electrical length of the second microstrip line; the electrical length of the third microstrip line, the electrical length of the fourth microstrip line, the electrical length of the fifth microstrip line and the electrical length of the sixth microstrip line are all equal; the electrical length of the seventh microstrip line, the electrical length of the eighth microstrip line, the electrical length of the ninth microstrip line, and the electrical length of the tenth microstrip line are all equal; the electrical length of the first open circuit branch, the electrical length of the second open circuit branch, the electrical length of the third open circuit branch and the electrical length of the fourth open circuit branch are all equal.
Further, the sum of the electrical length of the first microstrip line, the electrical length of the third microstrip line, the electrical length of the seventh microstrip line and the electrical length of the first open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the first microstrip line, the electrical length of the fourth microstrip line, the electrical length of the eighth microstrip line and the electrical length of the second open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the fifth microstrip line, the electrical length of the ninth microstrip line and the electrical length of the third open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the sixth microstrip line, the electrical length of the tenth microstrip line and the electrical length of the fourth circuit branch is one half wavelength corresponding to the center frequency of the filter.
Further, the characteristic impedance of the third microstrip line, the characteristic impedance of the fourth microstrip line, the characteristic impedance of the fifth microstrip line, the characteristic impedance of the sixth microstrip line, the characteristic impedance of the seventh microstrip line, the characteristic impedance of the eighth microstrip line, the characteristic impedance of the ninth microstrip line, the characteristic impedance of the tenth microstrip line, the characteristic impedance of the first open branch, the characteristic impedance of the second open branch, the characteristic impedance of the third open branch, and the characteristic impedance of the fourth open branch are equal and are twice the characteristic impedance of the first microstrip line and the characteristic impedance of the second microstrip line.
Further, the first parallel three-wire and the second parallel three-wire each include a first transmission line, a second transmission line and a third transmission line that are parallel to each other, the second transmission line is located between the first transmission line and the third transmission line, the second transmission line is used for being connected with the input end or the output end, and the first transmission line and the third transmission line are respectively used for being connected with the first microstrip line and the second microstrip line.
Another embodiment of the present utility model further provides a filter including any one of the above-described topologically designed filters.
Further, the filter further comprises a circuit board, wherein the dielectric loss of the circuit board is 0.0022, the thickness of the circuit board is 0.813mm, and the size of the circuit board is 19.5mm x 8.8mm.
Further, referring to fig. 2, the line width of the transmission line in the first parallel three lines and the second parallel three lines is set to w p =0.5 mm, the line length is set to s p =0.15 mm, and the line length is set to l p =7.35 mm.
The sum of the lengths of the first microstrip line and the second microstrip line is l 1 =7.4 mm, and the width of the first microstrip line and the width of the second microstrip line are w 1 =0.8 mm; the length of the third microstrip line, the length of the fourth microstrip line, the length of the fifth microstrip line and the length of the sixth microstrip line are all set to l 2 =7.1 mm, and the width of the third microstrip line, the width of the fourth microstrip line, the width of the fifth microstrip line, the width of the sixth microstrip line, the width of the seventh microstrip line, the width of the eighth microstrip line, the width of the ninth microstrip line, the width of the tenth microstrip line, the width of the first open-circuit branch, the width of the second open-circuit branch, the width of the third open-circuit branch and the width of the fourth open-circuit branch are all set to w 2 =0.4 mm; the length of the seventh microstrip line, the length of the eighth microstrip line, the length of the ninth microstrip line and the length of the tenth microstrip line are all set to be l 3 = 1.1mm; the length of the first open circuit branch, the length of the second open circuit branch, the length of the third open circuit branch and the length of the fourth open circuit branch are all set to be l 4 =5.35 mm.
As known from the common microwave knowledge, by changing the values of the physical length l P of the parallel three lines, the length of the first microstrip line 0.5× 1, the length l 2 of the third microstrip line, the length l 3 of the seventh microstrip line, and the length l 4 of the first open branch, the operating frequency of the filter can be changed inversely linearly. The performance parameters affecting the filter are four, namely the adjacent transmission line spacing s P forming parallel three lines, the transmission line width w P forming parallel three lines, and the width w 1 of the first microstrip line.
Referring to fig. 3, it can be seen that as the value of the parameter s P becomes larger, the passband bandwidth of the filter is unchanged, the isolation of the stopband becomes larger, the reflection coefficient near the passband edge becomes worse, but the reflection coefficient at the passband center frequency becomes better.
Referring to fig. 4, as the value of the parameter w P becomes larger, the bandwidth of the filter becomes slightly larger, the isolation of the lower stop band becomes slightly worse, the isolation of the upper stop band becomes slightly better, the reflection coefficient near the pass band edge becomes worse, but the reflection coefficient at the center frequency of the pass band becomes better.
Referring to fig. 5, as the value of the parameter w 1 becomes larger, the bandwidth of the band-pass filter becomes smaller, the isolation of the lower stop band becomes better, the isolation of the upper stop band becomes almost unchanged, the reflection coefficient near the pass band edge becomes better, but the reflection coefficient at the center frequency of the pass band becomes worse.
As can be seen from the analysis of fig. 3-5, the bandwidth of the filter designed based on the topology of the present embodiment is mainly controlled by the parameters w P and w 1, and the isolation of the stop band and the internal reflection coefficient of the pass band are commonly controlled by the parameters s P、wP and w 1. Furthermore, the filters designed based on this topology can only be bandpass filters, regardless of how the parameters s P、wP and w 1 are changed.
The bandpass filter corresponding to the typical size is an ultra-wideband filter, and the S parameter simulation result is shown in fig. 6. As can be seen from FIG. 6, the range of the impedance bandwidth with the reflection coefficient smaller than-10 dB is 3.65 to 8.59GHz, the center frequency of the passband is 6.12GHz, the absolute bandwidth of the passband is 4.94GHz, and the relative bandwidth of the passband is 80.7%. In addition, four transmission poles are arranged in the passband and are respectively positioned at 3.75,4.79,7.03 and 8.47GHz, and the four transmission poles ensure the flatness of the bandpass filter in the passband; two transmission zeros are arranged in the stop band and are respectively positioned at 3.01GHz and 8.93GHz, and the two transmission poles can ensure high selectivity of the filter.
Therefore, the ultra-wideband filter designed by the topology structure of the present embodiment has the advantages of high selectivity and miniaturization.
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 compact ultra-wideband filter is characterized by comprising a first parallel three wire and a second parallel three wire which are connected with each other, wherein the first parallel three wire and the second parallel three wire are distributed along a first direction, the other end of the first parallel three wire is connected with an input end, and the other end of the second parallel three wire is connected with an output end;
A first microstrip line and a second microstrip line are symmetrically connected between the first parallel three lines and the second parallel three lines, and are arranged along a second direction, and the second direction is perpendicular to the first direction;
The other end of the first microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, the other end of the third microstrip line is sequentially connected with a seventh microstrip line and a first open circuit branch, and the other end of the fourth microstrip line is sequentially connected with an eighth microstrip line and a second open circuit branch; the third microstrip line, the fourth microstrip line, the first open circuit branch and the second open circuit branch are all arranged along the first direction, and the seventh microstrip line and the eighth microstrip line are all arranged along the second direction; the third microstrip line, the fourth microstrip line, the seventh microstrip line, the eighth microstrip line, the first open circuit branch and the second open circuit branch are symmetrical with respect to the first microstrip line;
the other end of the second microstrip line is symmetrically connected with a fifth microstrip line and a sixth microstrip line, the other end of the fifth microstrip line is sequentially connected with a ninth microstrip line and a third open circuit branch, and the other end of the sixth microstrip line is sequentially connected with a tenth microstrip line and a fourth open circuit branch; the fifth microstrip line, the sixth microstrip line, the third open-circuit branch and the fourth open-circuit branch are all arranged along the first direction, and the ninth microstrip line and the tenth microstrip line are all arranged along the second direction; the fifth microstrip line and the sixth microstrip line, the ninth microstrip line and the tenth microstrip line, and the third open-circuit branch and the fourth open-circuit branch are symmetrical with respect to the second microstrip line;
The third microstrip line and the fifth microstrip line, the seventh microstrip line and the ninth microstrip line, the first open-circuit branch and the third open-circuit branch are symmetrical about the first parallel three-wire; the fourth and sixth microstrip lines, the eighth and tenth microstrip lines, the second and fourth open-circuit branches are all symmetrical about the second parallel three-wire.
2. The topology of a high selectivity compact ultra wideband filter of claim 1, wherein the electrical length of the first parallel three wire and the electrical length of the second parallel three wire are each a quarter wavelength corresponding to a filter center frequency.
3. The topology of the high selectivity compact ultra-wideband filter of claim 1, wherein an electrical length of the first microstrip line and an electrical length of the second microstrip line are equal; the electrical length of the third microstrip line, the electrical length of the fourth microstrip line, the electrical length of the fifth microstrip line and the electrical length of the sixth microstrip line are all equal; the electrical length of the seventh microstrip line, the electrical length of the eighth microstrip line, the electrical length of the ninth microstrip line, and the electrical length of the tenth microstrip line are all equal; the electrical length of the first open circuit branch, the electrical length of the second open circuit branch, the electrical length of the third open circuit branch and the electrical length of the fourth open circuit branch are all equal.
4. The topology of the high selectivity compact ultra-wideband filter of claim 3, wherein a sum of an electrical length of the first microstrip line, an electrical length of the third microstrip line, an electrical length of the seventh microstrip line, and an electrical length of the first open stub is one-half wavelength corresponding to a filter center frequency; the sum of the electrical length of the first microstrip line, the electrical length of the fourth microstrip line, the electrical length of the eighth microstrip line and the electrical length of the second open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the fifth microstrip line, the electrical length of the ninth microstrip line and the electrical length of the third open branch is one half wavelength corresponding to the center frequency of the filter; the sum of the electrical length of the second microstrip line, the electrical length of the sixth microstrip line, the electrical length of the tenth microstrip line and the electrical length of the fourth circuit branch is one half wavelength corresponding to the center frequency of the filter.
5. The topology of the high selectivity compact ultra-wideband filter of claim 1, wherein a characteristic impedance of the third microstrip line, a characteristic impedance of the fourth microstrip line, a characteristic impedance of the fifth microstrip line, a characteristic impedance of the sixth microstrip line, a characteristic impedance of the seventh microstrip line, a characteristic impedance of the eighth microstrip line, a characteristic impedance of the ninth microstrip line, a characteristic impedance of the tenth microstrip line, a characteristic impedance of the first open branch, a characteristic impedance of the second open branch, a characteristic impedance of the third open branch, and a characteristic impedance of the fourth open branch are equal and are twice as large as a characteristic impedance of the first microstrip line and a characteristic impedance of the second microstrip line.
6. The topology of the high selectivity compact ultra-wideband filter of claim 1, wherein the first parallel three-wire and the second parallel three-wire each comprise a first transmission line, a second transmission line, and a third transmission line that are parallel to each other, the second transmission line being located between the first transmission line and the third transmission line, the second transmission line being for connection with the input or output, the first transmission line and the third transmission line being for connection with the first microstrip line and the second microstrip line, respectively.
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 loss of 0.0022, a thickness of 0.813mm, and a dimension of 19.5mm x 8.8mm.
9. The filter of claim 7, wherein the line width of the transmission line in the first parallel three line and the second parallel three line is set to w p =0.5 mm, the line spacing is set to s p =0.15 mm, and the line length is set to l p =7.35 mm.
10. The filter of claim 7, wherein a sum of lengths of the first microstrip line and the second microstrip line is set to l 1 =7.4mm, and a width of the first microstrip line and a width of the second microstrip line are each set to w 1 =0.8mm; the length of the third microstrip line, the length of the fourth microstrip line, the length of the fifth microstrip line and the length of the sixth microstrip line are all set to l 2 =7.1 mm, and the width of the third microstrip line, the width of the fourth microstrip line, the width of the fifth microstrip line, the width of the sixth microstrip line, the width of the seventh microstrip line, the width of the eighth microstrip line, the width of the ninth microstrip line, the width of the tenth microstrip line, the width of the first open-circuit branch, the width of the second open-circuit branch, the width of the third open-circuit branch and the width of the fourth open-circuit branch are all set to w 2 =0.4 mm; the length of the seventh microstrip line, the length of the eighth microstrip line, the length of the ninth microstrip line and the length of the tenth microstrip line are all set to be l 3 = 1.1mm; the length of the first open circuit branch, the length of the second open circuit branch, the length of the third open circuit branch and the length of the fourth open circuit branch are all set to be l 4 =5.35 mm.
CN202322883966.1U 2023-10-25 Topological structure of high-selectivity compact ultra-wideband filter and filter Active CN221239780U (en)

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