CN214203928U - Planar CQ band-pass filter used on KU band high-frequency head - Google Patents
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Abstract
The invention discloses a planar CQ band-pass filter used on a KU wave band high-frequency head, which is characterized in that: the micro-strip resonator comprises an input end feeder head for inputting signals, an output end feeder head for outputting signals, a first port feeder line, a second port feeder line, a first micro-strip resonator, a second micro-strip resonator and a third micro-strip resonator; the module is arranged on the circuit board in an axisymmetric mode, and the first port feeder line and the second port feeder line are both vertical to the symmetry axis of the plane CQ band-pass filter; on one side of the symmetry axis of the plane CQ band-pass filter, a first port feeder line, a first microstrip resonator and a half of a second microstrip resonator are sequentially arranged, and a straight line formed by arrangement is parallel to the symmetry axis; on the other side of the symmetry axis of the plane CQ band-pass filter, a second port feeder line, a third microstrip resonator and the other half of the second microstrip resonator are sequentially arranged, and a straight line formed by arrangement is parallel to the symmetry axis of the filter; the band-pass filter has the characteristics of low insertion loss, small size and low cost.
Description
Technical Field
The invention relates to the field of band-pass filters, in particular to a planar CQ band-pass filter used on a KU-band high-frequency head.
Background
The band-pass filter used on the KU band high-frequency head in the prior art has large insertion loss, large size and complicated manufacturing process.
In view of the above problems, the present invention provides a planar CQ band pass filter for a KU-band high-frequency head, and the filter is thus produced.
Disclosure of Invention
The invention provides a planar CQ band-pass filter for a KU band high-frequency head, which has the characteristics of low insertion loss, small size, simple structure and low cost; specifically, the invention is realized by the following technical scheme:
a plane CQ band-pass filter used on a KU band high-frequency head comprises an input end feeder head for inputting electromagnetic wave signals, an output end feeder head for outputting electromagnetic wave signals, a first port feeder line, a second port feeder line, a first microstrip resonator, a second microstrip resonator and a third microstrip resonator; the modules are arranged on the circuit board in an axisymmetric manner, and the first port feeder line and the second port feeder line are both vertical to the symmetry axis of the plane CQ band-pass filter; on one side of the symmetry axis of the plane CQ band-pass filter, the first port feeder line, the first microstrip resonator and one half of the second microstrip resonator are sequentially arranged in a straight line, and the straight line formed by the arrangement of the first port feeder line, the first microstrip resonator and the half of the second microstrip resonator is parallel to the symmetry axis; on the other side of the symmetry axis of the plane CQ band-pass filter, the second port feeder line, the third microstrip resonator and the other half of the second microstrip resonator are sequentially arranged in a straight line, and the straight line formed by the arrangement of the third microstrip resonator, the third microstrip resonator and the second microstrip resonator is parallel to the symmetry axis of the filter; the first port feeder line is symmetrical to the second port feeder line, and the first port feeder line is perpendicular to the symmetry axis; the first microstrip resonator is symmetrical to the third microstrip resonator; the input end feeder head and the output end feeder head are symmetrically arranged; the first port feeder and the second port feeder are located between the input end feeder head and the output end feeder head, the first port feeder is connected with the input end feeder head, and the second port feeder is connected with the output end feeder head.
Further, a fourth coupling gap exists between the first port feeder line and the second port feeder line; a second coupling gap exists between the third microstrip resonator and the first microstrip resonator; third coupling gaps are arranged between the second microstrip resonator and the third microstrip resonator and between the second microstrip resonator and the first microstrip resonator; a first coupling gap exists between the first microstrip resonator and the first port feeder line, and between the third microstrip resonator and the second port feeder line.
Preferably, the width S1 of the first coupling gap is 0.15mm, the width S2 of the second coupling gap is 0.18mm, the width S3 of the third coupling gap is 0.14mm, and the width S4 of the fourth coupling gap is 0.18 mm.
Furthermore, the first port feeder line and the second port feeder line are all straight lines with equal width, and the two lines are the same in size, and the length L1 is 2.7mm, and the width W1 is 0.15 mm.
Further, the first microstrip resonator and the second microstrip resonator are in axisymmetric patterns, and the symmetry axis of each microstrip resonator is perpendicular to the symmetry axis of the plane CQ band-pass filter; the first microstrip resonator and the second microstrip resonator are composed of nine microstrip lines.
Further, nine microstrip lines are respectively arranged as follows: two long microstrip lines parallel to the first port feeder line are arranged on the periphery of the microstrip resonator, the two long microstrip lines are identical in size, the length L2 of the two long microstrip lines is 2.6mm, and the width W2 of the two long microstrip lines is 0.3 mm; two short microstrip lines parallel to the first port feeder line are arranged in the inner periphery of the microstrip resonator, the two short microstrip lines are completely the same in size, the length L3 of the two short microstrip lines is 1.9mm, and the width W3 of the two short microstrip lines is 0.2 mm; two microstrip lines perpendicular to the first port feeder line are arranged on the periphery of the microstrip resonator, the two microstrip lines are positioned on one side close to the symmetrical axis of the filter, the two microstrip lines are completely the same in size, the length L4 of the two microstrip lines is 0.44mm, and the width W4 of the two microstrip lines is 0.44 mm; two microstrip lines perpendicular to the first port feeder line are arranged on the periphery of the microstrip resonator, the two microstrip lines are positioned on one side far away from the symmetrical axis of the filter, the two microstrip lines are completely the same in size, the length L5 of the two microstrip lines is 0.22mm, and the width W5 of the two microstrip lines is 0.2 mm; and one microstrip line which is arranged in the inner periphery of the microstrip resonator and is vertical to the first port feeder line, wherein the length L6 of the microstrip line is 0.3mm, and the width W6 of the microstrip line is 0.8 mm.
Furthermore, the second microstrip resonator is composed of seventy microstrip lines, the second microstrip resonator is in an axisymmetric figure, and the symmetry axis of the second microstrip resonator is parallel to the symmetry axis of the plane CQ band-pass filter.
Further, seventy microstrip lines are arranged as follows: the longest microstrip line parallel to the first port feeder line is arranged on the periphery of the microstrip resonator, the length of the microstrip line is L7-3.46 mm, and the width of the microstrip line is W7-0.33 mm; the two microstrip lines are completely the same in size, the length L10 of the two microstrip lines is 2.59mm, and the width W7 of the two microstrip lines is 0.2 mm; the two microstrip lines which are arranged in the microstrip resonator and are the third long and parallel to the first port feeder line are completely the same in size, the length L13 of the two microstrip lines is 1.19mm, and the width W13 of the two microstrip lines is 0.28 mm; the two microstrip lines are completely the same in size, the length of each microstrip line is L13-1.19 mm, and the width of each microstrip line is W13-0.28 mm; the two shortest microstrip lines parallel to the first port feeder line on the periphery of the microstrip resonator have the same size, the length L8 of the two microstrip lines is 0.68mm, and the width W8 of the two microstrip lines is 0.26 mm; the two longest microstrip lines perpendicular to the first port feeder line are completely the same in size, the length of the gate is L14-0.83 mm, and the width of the gate is W14-0.20 mm; the microstrip resonator is internally surrounded by two microstrip lines which are vertical to the first port feeder line and have the second length, the two microstrip lines have the same size, the length L12 of the two microstrip lines is 0.37mm, and the width W12 of the two microstrip lines is 0.53 mm; the two shortest microstrip lines perpendicular to the first port feeder line are arranged in the microstrip resonator, the two microstrip lines are identical in size, the length L11 of the two microstrip lines is 0.20mm, and the width W11 of the two microstrip lines is 0.24 mm.
And further, the circuit board is selected to be a double-sided copper-clad micro-strip board, one side of the double-sided copper-clad micro-strip board is printed with the module, and the other side of the double-sided copper-clad micro-strip board is a copper-clad grounding plate.
The beneficial effect of this application lies in:
the 11.7GHz-12.75GHz frequency band-pass filter designed by the application has the advantages that the total size is smaller than that of the traditional filter, the image rejection characteristic is below-40 dB, the attenuation is above-3 dB, the insertion loss is low, the size is small, the structure is simple, the cost is low, and the characteristics can completely meet the requirements of a KU tuner.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a planar CQ band-pass filter provided in the present invention;
FIG. 2 is a schematic diagram of an embodiment of a planar CQ bandpass filter provided by the present invention;
FIG. 3 is a schematic diagram of an embodiment of an input end feeder head connected to a first port feeder according to the present invention;
fig. 4 is a schematic diagram of a first microstrip resonator according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a second microstrip resonator embodiment according to the present invention;
fig. 6 is a graph of experimental data of an embodiment of a planar CQ band-pass filter according to the present invention.
Wherein: 1. an input end feeder head; 2. a feed line header at the output end; 3. a first port feeder; 4. a second port feed line; 5. a first microstrip resonator; 6. a second microstrip resonator; 7. a third microstrip resonator; a half second microstrip resonator; a second microstrip resonator of half B; 10. a first coupling gap; 11. a second coupling gap; 12. a third coupling gap; 13. a fourth coupling gap.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 and 2, a planar CQ band pass filter for a KU-band high-frequency head is an axisymmetric pattern; the planar CQ band-pass filter comprises an input end feeder head 1 for inputting electromagnetic wave signals, an output end feeder head 2 for outputting electromagnetic wave signals, a first port feeder 3, a second port feeder 4, a first microstrip resonator 5, a second microstrip resonator 6 and a third microstrip resonator 7, wherein the modules are manufactured on one surface of a double-sided copper-clad microstrip plate in a printed circuit board mode, and the other surface of the double-sided copper-clad microstrip plate is a copper-clad ground plate.
The first port feeder line 3 and the second port feeder line 4 are symmetrically arranged, the first microstrip resonator 5 and the third microstrip resonator 7 are symmetrically arranged, and the input end feeder line head 1 and the output end feeder line head 2 are symmetrically arranged. The first port feeder 3 and the second port feeder 4 are positioned between the input end feeder head 1 and the output end feeder head 2; the first port feeder 3 is connected with the input port feeder head 1, and the second port feeder 4 is connected with the output port feeder head 2.
The second microstrip resonator 6 is an axisymmetric pattern, the symmetry axis of the second microstrip resonator is coincident with the symmetry axis of the planar CQ bandpass filter, and the second microstrip resonator 6 is divided into a half a second microstrip resonator 8 and a half B second microstrip resonator 9 by taking the symmetry axis as a boundary.
On one side of the symmetry axis of the plane CQ band-pass filter, the first port feeder line 3, the first microstrip resonator 5 and the half A second microstrip resonator 8 are sequentially arranged in a straight line, and the straight line formed by the arrangement of the first port feeder line, the first microstrip resonator 5 and the half A second microstrip resonator 8 is parallel to the symmetry axis of the filter.
On the other side of the symmetry axis of the plane CQ band-pass filter, the second port feeder line 4, the third microstrip resonator 7 and the half-B second microstrip resonator 9 are sequentially arranged in a straight line, and the straight line formed by the arrangement of the third port feeder line 4, the third microstrip resonator 7 and the half-B second microstrip resonator 9 is parallel to the symmetry axis of the filter.
The first port feeder line 3 and the second port feeder line 4 are completely arranged in mirror symmetry with the filter symmetry axis as a symmetry axis, as shown in fig. 3, the first port feeder line 3 and the second port feeder line 4 are straight lines with equal width, and have the same size, their length is defined as L1 ═ 2.7mm, and their width is defined as W1 ═ 0.15 mm; a fourth coupling gap 13 exists between the first port feed line 3 and the second port feed line 4, and a width S2 of the fourth coupling gap 13 is 0.18 mm. The first port feed line 3 and the second port feed line 4 are both perpendicular to the symmetry axis of the planar CQ band-pass filter.
The first microstrip resonator 5 is an axisymmetric figure, and the symmetry axis of the first microstrip resonator is perpendicular to the symmetry axis of the plane CQ band-pass filter.
As shown in fig. 4, the first microstrip resonator 5 is composed of nine microstrip lines, wherein two long microstrip lines parallel to the first port feeder 3 are completely the same in size, and have a length L2 of 2.6mm and a width W2 of 0.3 mm; two short microstrip lines parallel to the first port feeder line 3 are arranged in the microstrip resonator, the two short microstrip lines have the same size, the length L3 of the two short microstrip lines is 1.9mm, and the width W3 of the two short microstrip lines is 0.2 mm; two microstrip lines perpendicular to the first port feeder 3 on the periphery of the microstrip resonator, wherein the two microstrip lines are positioned on one side close to the symmetric axis of the filter, the two microstrip lines are completely the same in size, the length L4 of the two microstrip lines is 0.44mm, and the width W4 of the two microstrip lines is 0.44 mm; two microstrip lines perpendicular to the first port feeder line 3 on the periphery of the microstrip resonator, wherein the two microstrip lines are positioned on one side far away from the symmetric axis of the filter, the two microstrip lines are completely the same in size, the length L5 of the two microstrip lines is 0.22mm, and the width W5 of the two microstrip lines is 0.2 mm; one microstrip line perpendicular to the first port feeder 3 and surrounding the microstrip resonator has a length L6 of 0.3mm and a width W6 of 0.8 mm.
As shown in fig. 2, the third microstrip resonator 7 and the first microstrip resonator 5 are completely arranged in a mirror symmetry manner with the symmetry axis of the filter as the symmetry axis, and a second coupling gap 11 exists between the third microstrip resonator 7 and the first microstrip resonator 5.
As shown in fig. 2, a first coupling gap 10 exists between the first microstrip resonator 5 and the first port feed line 3, and between the third microstrip resonator 7 and the second port feed line 4, and a width S1 of the first coupling gap 10 is 0.15 mm.
As shown in fig. 5, the second microstrip resonator 6 is composed of seventy microstrip lines, wherein the longest microstrip line parallel to the first port feeder 3 is arranged at the periphery of the microstrip resonator, and has a length L7 ═ 3.46mm and a width W7 ═ 0.33 mm; two microstrip lines which are second long and parallel to the first port feeder line 3 and are arranged on the periphery of the microstrip resonator, wherein the two microstrip lines are identical in size, the length L10 of the two microstrip lines is 2.59mm, and the width W7 of the two microstrip lines is 0.2 mm; wherein, two microstrip lines of the third length, which are parallel to the first port feeder line 3, are enclosed in the microstrip resonator, the two microstrip lines have the same size, the length L13 is 1.19mm, and the width W13 is 0.28 mm; the two microstrip lines are completely the same in size, the length of each microstrip line is L13-1.19 mm, and the width of each microstrip line is W13-0.28 mm; the two shortest microstrip lines parallel to the first port feeder 3 on the periphery of the microstrip resonator have the same size, the length L8 of the two microstrip lines is 0.68mm, and the width W8 of the two microstrip lines is 0.26 mm; the two longest microstrip lines perpendicular to the first port feeder 3 are completely the same in size, the length of the gate is L14-0.83 mm, and the width of the gate is W14-0.20 mm; two microstrip lines perpendicular to the first port feeder line 3 and having the second length are arranged in the microstrip resonator, the two microstrip lines have the same size, the length L12 of the two microstrip lines is 0.37mm, and the width W12 of the two microstrip lines is 0.53 mm; the two shortest microstrip lines perpendicular to the first port feeder 3 are completely the same in size, and have a length L11 of 0.20mm and a width W11 of 0.24 mm.
As shown in fig. 2, a third coupling gap 12 is present between the second microstrip resonator 6 and the third microstrip resonator 7, and between the second microstrip resonator 6 and the first microstrip resonator 5, and a width S3 of the third coupling gap 12 is 0.14 mm.
As shown in FIG. 6, the results of the scattering parameter simulation of the planar band-pass filter are shown, with frequencies ranging from 11.7GHz to 12.75 GHz.
The horizontal axis represents the input signal frequency of the inventive bandpass filter and the vertical axis represents the log amplitude, including the amplitude of the insertion loss S21 and the amplitude of the return loss S11. S21 represents the relationship between the input power of a signal passing through the bandpass filter of the present invention and the output power of the signal, with the corresponding mathematical function: 10 × lg (Pi/Po) ═ 20 × lg | S21|, where Pi denotes input power and Po denotes output power. In the signal transmission process of the band-pass filter of the present invention, part of the power of the signal is reflected back to the signal source, and the reflected power becomes the reflected power. S11 shows the relationship between the input power of the signal and the reflected power of the signal of the band pass filter of the present invention, and the corresponding mathematical function is: 10 × lg (Pr/Pi) ═ 20 × lg | S11|, where P denotes the reflected power and Pi denotes the incident power.
As can be seen from fig. 6, the filter center frequency is 12.225GHz, the absolute value of the insertion loss is less than 2dB, and the absolute value of the return loss is greater than 16 dB.
The above is the preferred embodiment of the present invention, and several other simple substitutions and modifications made on the premise of the inventive concept should be considered as falling into the protection scope of the present invention.
Claims (9)
1. A plane CQ band-pass filter used on a KU band high-frequency head is characterized in that: the device comprises an input end feeder head for inputting electromagnetic wave signals, an output end feeder head for outputting electromagnetic wave signals, a first port feeder line, a second port feeder line, a first microstrip resonator, a second microstrip resonator and a third microstrip resonator; the plane CQ band-pass filter is arranged on the circuit board in an axisymmetric mode, and the first port feeder line and the second port feeder line are both vertical to the symmetry axis of the plane CQ band-pass filter; on one side of the symmetry axis of the plane CQ band-pass filter, the first port feeder line, the first microstrip resonator and one half of the second microstrip resonator are sequentially arranged in a straight line, and the straight line formed by the arrangement of the first port feeder line, the first microstrip resonator and the half of the second microstrip resonator is parallel to the symmetry axis; on the other side of the symmetry axis of the plane CQ band-pass filter, the second port feeder line, the third microstrip resonator and the other half of the second microstrip resonator are sequentially arranged in a straight line, and the straight line formed by the arrangement of the third microstrip resonator, the third microstrip resonator and the second microstrip resonator is parallel to the symmetry axis of the filter; the first port feeder line is symmetrical to the second port feeder line, and the first port feeder line is perpendicular to the symmetry axis; the first microstrip resonator is symmetrical to the third microstrip resonator; the input end feeder head and the output end feeder head are symmetrically arranged; the first port feeder and the second port feeder are located between the input end feeder head and the output end feeder head, the first port feeder is connected with the input end feeder head, and the second port feeder is connected with the output end feeder head.
2. The planar CQ band pass filter for a KU-band applicator as claimed in claim 1, wherein: a fourth coupling gap exists between the first port feeder line and the second port feeder line; a second coupling gap exists between the third microstrip resonator and the first microstrip resonator; third coupling gaps are arranged between the second microstrip resonator and the third microstrip resonator and between the second microstrip resonator and the first microstrip resonator; a first coupling gap exists between the first microstrip resonator and the first port feeder line, and between the third microstrip resonator and the second port feeder line.
3. The planar CQ band pass filter for a KU-band applicator as claimed in claim 2, wherein: the width of the first coupling gap S1=0.15mm, the width of the second coupling gap S2=0.18mm, the width of the third coupling gap S3=0.14mm, and the width of the fourth coupling gap S4=0.18 mm.
4. The planar CQ band pass filter for a KU-band applicator as claimed in claim 1, wherein: the first port feeder line and the second port feeder line are straight lines with equal width, and the first port feeder line and the second port feeder line are the same in size, and have the length L1=2.7mm and the width W1=0.15 mm.
5. The planar CQ band pass filter for a KU-band applicator as claimed in claim 1, wherein: the first microstrip resonator and the second microstrip resonator are in axisymmetric patterns, and the symmetry axis of each microstrip resonator is vertical to the symmetry axis of the plane CQ band-pass filter; the first microstrip resonator and the second microstrip resonator are composed of nine microstrip lines.
6. The planar CQ band-pass filter for a KU-band high-frequency head as claimed in claim 5, wherein: nine microstrip lines are respectively arranged as follows: two long microstrip lines parallel to the first port feeder line on the periphery of the microstrip resonator, wherein the two long microstrip lines have the same size, and the length L2=2.6mm and the width W2=0.3 mm; two short microstrip lines parallel to the first port feeder line are arranged in the inner periphery of the microstrip resonator, the two short microstrip lines are identical in size, the length L3=1.9mm, and the width W3=0.2 mm; two microstrip lines perpendicular to the first port feeder line on the periphery of the microstrip resonator, wherein the two microstrip lines are positioned on one side close to the symmetrical axis of the filter, the two microstrip lines are identical in size, and the length L4=0.44mm and the width W4=0.44 mm; two microstrip lines perpendicular to the first port feeder line on the periphery of the microstrip resonator, wherein the two microstrip lines are positioned on one side far away from the symmetrical axis of the filter, the two microstrip lines are identical in size, and the length L5=0.22mm and the width W5=0.2 mm; and one microstrip line perpendicular to the first port feeder line and arranged in the inner periphery of the microstrip resonator, wherein the length L6=0.3mm, and the width W6=0.8 mm.
7. The planar CQ band pass filter for a KU-band applicator as claimed in claim 1, wherein: the second microstrip resonator is composed of seventy microstrip lines, the second microstrip resonator is in an axisymmetric pattern, and the symmetry axis of the second microstrip resonator is parallel to the symmetry axis of the plane CQ band-pass filter.
8. The planar CQ band pass filter for a KU-band applicator as claimed in claim 7, wherein: seventy microstrip lines are arranged as follows: the longest microstrip line parallel to the first port feeder line is arranged on the periphery of the microstrip resonator, the length of the microstrip line is L7=3.46mm, and the width of the microstrip line is W7=0.33 mm; two microstrip lines of a second length parallel to the first port feeder line on the periphery of the microstrip resonator, wherein the two microstrip lines are identical in size, and the length L10=2.59mm and the width W7=0.2 mm; two microstrip lines with a third length and parallel to the first port feeder line are arranged in the inner periphery of the microstrip resonator, the two microstrip lines are identical in size, the length L13=1.19mm, and the width W13=0.28 mm; the two microstrip lines are completely the same in size, the length of each microstrip line is L13=1.19mm, and the width of each microstrip line is W13=0.28 mm; the two shortest microstrip lines parallel to the first port feeder line on the periphery of the microstrip resonator have the same size, and the length L8=0.68mm and the width W8=0.26 mm; the two longest microstrip lines perpendicular to the first port feeder line are completely the same in size, the length of the gate is L14=0.83mm, and the width of the gate is W14=0.20 mm; two microstrip lines perpendicular to the first port feeder line and having a second length are arranged in the inner periphery of the microstrip resonator, the two microstrip lines have the same size, and the length L12=0.37mm and the width W12=0.53 mm; the two shortest microstrip lines perpendicular to the first port feeder line are arranged in the microstrip resonator, the two microstrip lines are identical in size, and the length L11=0.20mm and the width W11=0.24 mm.
9. The planar CQ band pass filter for a KU-band applicator as claimed in claim 1, wherein: the circuit board is selected to be a double-sided copper-clad microstrip board, one side of the double-sided copper-clad microstrip board is printed with an input end feeder head, an output end feeder head, a first port feeder line, a second port feeder line, a first microstrip resonator, a second microstrip resonator and a third microstrip resonator, and the other side of the double-sided copper-clad microstrip board is a copper-clad ground plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022797119.XU CN214203928U (en) | 2020-11-27 | 2020-11-27 | Planar CQ band-pass filter used on KU band high-frequency head |
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| CN202022797119.XU CN214203928U (en) | 2020-11-27 | 2020-11-27 | Planar CQ band-pass filter used on KU band high-frequency head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425375A (en) * | 2022-08-19 | 2022-12-02 | 中国电子科技集团公司第二十九研究所 | Band-pass filter and miniaturized CQ topological structure thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425375A (en) * | 2022-08-19 | 2022-12-02 | 中国电子科技集团公司第二十九研究所 | Band-pass filter and miniaturized CQ topological structure thereof |
| CN115425375B (en) * | 2022-08-19 | 2023-07-18 | 中国电子科技集团公司第二十九研究所 | Band-pass filter and miniaturized CQ topological structure thereof |
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