CN111326836B - A Y-shaped interdigital capacitance adjustable coupling structure and superconducting filter - Google Patents
A Y-shaped interdigital capacitance adjustable coupling structure and superconducting filter Download PDFInfo
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Abstract
本发明公开一种Y型叉指电容可调耦合结构及超导滤波器，涉及微波通讯技术领域，所述Y型叉指电容可调耦合结构包括：超导矩形块、第一叉指电容、第二叉指电容、第三叉指电容和点焊板；所述第一叉指电容设置在所述超导矩形块和第一谐振器之间；所述第二叉指电容设置在所述超导矩形块和第二谐振器之间；所述第一谐振器和所述第二谐振器位于所述超导矩形块的对边；所述第三叉指电容设置在所述超导矩形块与所述点焊板之间；所述第三叉指电容通过所述点焊板接地。本发明提供的装置可以实现谐振器之间耦合强度的灵活控制。
The invention discloses a Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter, and relates to the technical field of microwave communication. The Y-shaped interdigital capacitance adjustable coupling structure comprises: a superconducting rectangular block, a first interdigital capacitor, The second interdigital capacitor, the third interdigital capacitor and the spot welding plate; the first interdigital capacitor is provided between the superconducting rectangular block and the first resonator; the second interdigital capacitor is provided on the between the superconducting rectangular block and the second resonator; the first resonator and the second resonator are located on opposite sides of the superconducting rectangular block; the third interdigital capacitor is arranged on the superconducting rectangular block between the block and the spot welding plate; the third interdigital capacitor is grounded through the spot welding plate. The device provided by the present invention can realize flexible control of the coupling strength between the resonators.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter.
Background
The pass band width, referred to as bandwidth, is a very important indicator in the design of band pass filters. For reconfigurable filters, bandwidth reconfigurable filters are also an important large class. It has two important meanings. First, the bandwidth reconfigurable filter can better cope with the interference noise occurring at the passband edge. The rejection degree of the filter in the passband edge frequency band is not high, and the anti-interference capability is not strong. If the bandwidth of the filter can be regulated, the bandwidth can be slightly narrowed when noise appears at the edge of a pass band, the bandwidth can be widened when the noise disappears, and the filter and the whole microwave system are more flexible. On the other hand, the bandwidth of the center frequency reconfigurable filter is often changed along with the frequency, and some practical applications require that the bandwidth change is avoided as much as possible. If the bandwidth of the filter can be flexibly controlled independently of the center frequency, the above-mentioned transformation can be effectively counteracted, and the requirement of unchanging absolute bandwidth or relative bandwidth can be realized.
The surface resistance of the high-temperature superconducting material is very small, and a filter made of the high-temperature superconducting material has a series of advantages of small loss, steep band edge and the like, so that the sensitivity of a communication device can be greatly improved. The reconfigurable filter made of the high-temperature superconducting material has the advantages of low insertion loss, high out-of-band rejection degree, high band edge steepness and the like, and meanwhile, performance indexes such as central frequency, trap point, bandwidth and the like can be changed according to needs. The method is applied to a microwave communication system, so that out-of-band interference can be effectively reduced, and the sensitivity and reliability of system work are improved; and different working states can be switched according to the noise condition of the electromagnetic environment, so that the adaptability is strong.
The loaded interdigital capacitor structure is a very low-loss frequency modulation mode which is very suitable for superconducting materials. By loading the interdigital capacitor structure at a proper position and grounding, the center frequency reconfiguration or the notch point reconfiguration of the filter can be realized. When analyzing the structure, the interdigital capacitor structure can be simply regarded as a variable capacitor. The application of the interdigital capacitor structure to the bandwidth reconfigurable filter is still a blank at present.
Disclosure of Invention
The invention aims to provide a Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter so as to realize flexible control of coupling strength between resonators.
In order to achieve the purpose, the invention provides the following scheme:
a Y-shaped interdigital capacitance adjustable coupling structure comprises: the superconducting rectangular block, the first interdigital capacitor, the second interdigital capacitor, the third interdigital capacitor and the spot welding plate are arranged on the substrate;
the first interdigital capacitor is arranged between the superconducting rectangular block and the first resonator;
the second interdigital capacitor is arranged between the superconducting rectangular block and the second resonator;
the first resonator and the second resonator are positioned on opposite sides of the superconducting rectangular block;
the third interdigital capacitor is arranged between the superconducting rectangular block and the spot welding plate; the third interdigital capacitor is grounded through the spot welding plate.
Optionally, the number of the spot welding plates is N.
Optionally, the Y-shaped interdigital capacitance-adjustable coupling structure further includes a spot welding point; the spot welding plate is grounded through the spot welding point.
In order to achieve the above purpose, the invention also provides the following scheme:
a 2-bit bandwidth reconfigurable superconducting filter comprising: the tunable coupling structure comprises a first resonator, a second resonator and a Y-shaped interdigital capacitance tunable coupling structure;
the Y-shaped interdigital capacitance adjustable coupling structure is arranged between the first resonator and the second resonator.
Optionally, the 2-bit bandwidth reconfigurable superconducting filter further includes an input feeder;
the input feeder is arranged on one side of the first resonator; one side of the first resonator is a side far away from a third interdigital capacitor of the Y-shaped interdigital capacitor adjustable coupling structure.
Optionally, the 2-bit bandwidth reconfigurable superconducting filter further includes an output feeder;
the output feeder is arranged on one side of the second resonator; and one side of the second resonator is far away from the third interdigital capacitor of the Y-shaped interdigital capacitor adjustable coupling structure.
In order to achieve the above purpose, the invention also provides the following scheme:
a four-section 2-bit bandwidth reconfigurable superconducting filter comprises: the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the first Y-shaped interdigital capacitance adjustable coupling structure, the second Y-shaped interdigital capacitance adjustable coupling structure and the third Y-shaped interdigital capacitance adjustable coupling structure;
the first Y-shaped interdigital capacitance adjustable coupling structure is arranged between the third resonator and the fourth resonator;
the second Y-shaped interdigital capacitance adjustable coupling structure is arranged between the fourth resonator and the fifth resonator;
the third Y-shaped interdigital capacitance adjustable coupling structure is arranged between the fifth resonator and the sixth resonator.
Optionally, the four sections of 2-bit bandwidth reconfigurable superconducting filters further include a first input feeder; the first input feed line is arranged on one side of the third resonator; and one side of the third resonator is the side of the third interdigital capacitor far away from the first Y-shaped interdigital capacitor adjustable coupling structure.
Optionally, the four sections of 2-bit bandwidth reconfigurable superconducting filters further include a first output feeder; the first output feeder is arranged on one side of the sixth resonator; and one side of the sixth resonator is the side far away from the third interdigital capacitor of the third Y-shaped interdigital capacitor adjustable coupling structure.
Optionally, the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the first Y-type interdigital capacitance-adjustable coupling structure, the second Y-type interdigital capacitance-adjustable coupling structure, and the third Y-type interdigital capacitance-adjustable coupling structure are all etched on the superconducting thin film by photolithography and dry etching.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter, which realize flexible control of coupling strength between resonators by setting grounding and ungrounded of a spot welding plate, namely realize flexible adjustment of coupling coefficients between the resonators, and further realize flexible control of bandwidth.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a Y-type interdigital capacitance tunable coupling structure in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a 2-bit bandwidth reconfigurable superconducting filter according to an embodiment of the present invention;
FIG. 3 is a graph comparing coupling curves of a Y-type interdigital capacitance tunable coupling structure in accordance with an embodiment of the present invention;
FIG. 4 is a microstrip line circuit diagram of a four-section 2-bit bandwidth reconfigurable superconducting filter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a four-section 2-bit bandwidth reconfigurable superconducting filter according to an embodiment of the present invention;
fig. 6 is a coupling curve diagram of a four-section 2-bit bandwidth reconfigurable superconducting filter resonator according to an embodiment of the present invention.
Description of the symbols:
the device comprises a first interdigital capacitor 1, a second interdigital capacitor 2, a third interdigital capacitor 3, a superconducting rectangular block 4, a spot welding plate 5, a first resonator A, a second resonator B, Y type interdigital capacitor adjustable coupling structure 6, an input feeder line 7 and an output feeder line 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter so as to realize flexible control of coupling strength between resonators.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a Y-type interdigital capacitance adjustable coupling structure includes: the superconducting rectangular block 4, the first interdigital capacitor 1, the second interdigital capacitor 2, the third interdigital capacitor 3 and the spot welding plate 5.
The first interdigital capacitor 1 is arranged between the superconducting rectangular block 4 and the first resonator.
The second interdigital capacitor 2 is arranged between the superconducting rectangular block 4 and the second resonator.
The first resonator and the second resonator are located at opposite sides of the superconducting rectangular block 4.
The third interdigital capacitor 3 is arranged between the superconducting rectangular block 4 and the spot welding plate 5; the third interdigital capacitor 3 is grounded through the spot welding plate 5.
In addition, the spot welding plates 5 are provided in number of N. By earthing the differential weld plate 5, 2 is realizedNA different state. In the present embodiment, only two spot welding plates 5 are taken as an example, and there are four different states, where 0 represents no ground and 1 represents ground, and the coupling curve pairs of these four states are shown in fig. 3. It can be seen that as the number of spot-welded plates 5 grounded increases, the left peak on the coupling curve is stationary and the right peak gradually shifts to the left. I.e. the strength of the coupling between the first resonator and the second resonator is gradually reduced.
In addition, the Y-shaped interdigital capacitance adjustable coupling structure also comprises spot welding points; the spot welding plate 5 is grounded through the spot welding point.
As shown in fig. 2, the present invention further provides a 2-bit bandwidth reconfigurable superconducting filter, including: the resonator comprises a first resonator A, a second resonator B and a Y-shaped interdigital capacitance adjustable coupling structure 6.
The Y-shaped interdigital capacitance adjustable coupling structure 6 is arranged between the first resonator A and the second resonator B.
In addition, the 2-bit bandwidth reconfigurable superconducting filter further comprises an input feeder 7. Wherein the input feed line 7 is arranged at one side of the first resonator a; one side of the first resonator a is a side of the third interdigital capacitor 3 far away from the Y-shaped interdigital capacitor adjustable coupling structure 6.
In addition, the 2-bit bandwidth reconfigurable superconducting filter further comprises an output feeder line 8. Wherein the output feed line 8 is arranged at one side of the second resonator B; and one side of the second resonator B is far away from the third interdigital capacitor 3 of the Y-shaped interdigital capacitor adjustable coupling structure 6.
As shown in fig. 4-5, the present invention further provides a four-section 2-bit bandwidth reconfigurable superconducting filter, comprising: the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the first Y-shaped interdigital capacitance adjustable coupling structure, the second Y-shaped interdigital capacitance adjustable coupling structure and the third Y-shaped interdigital capacitance adjustable coupling structure.
The first Y-shaped interdigital capacitance adjustable coupling structure is arranged between the third resonator and the fourth resonator.
The second Y-shaped interdigital capacitance adjustable coupling structure is arranged between the fourth resonator and the fifth resonator.
The third Y-shaped interdigital capacitance adjustable coupling structure is arranged between the fifth resonator and the sixth resonator.
In addition, the four sections of 2-bit bandwidth reconfigurable superconducting filters also comprise a first input feeder 7; the first input feed line 7 is arranged on one side of the third resonator; and one side of the third resonator is the side far away from the third interdigital capacitor 3 of the first Y-shaped interdigital capacitor adjustable coupling structure.
In addition, the four sections of 2-bit bandwidth reconfigurable superconducting filters also comprise a first output feeder line 8; the first output feed line 8 is arranged at one side of the sixth resonator; and one side of the sixth resonator is the side far away from the third interdigital capacitor 3 of the third Y-shaped interdigital capacitor adjustable coupling structure.
Preferably, the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the first Y-type interdigital capacitance-adjustable coupling structure, the second Y-type interdigital capacitance-adjustable coupling structure, and the third Y-type interdigital capacitance-adjustable coupling structure are all etched on the superconducting thin film by photolithography and dry etching.
As shown in fig. 6, the four-section 2-bit bandwidth reconfigurable superconducting filter is provided with 6 spot welding plates, wherein the 00 state represents that the spot welding plate 5 is not grounded at all, the 01 state represents that the 1 st, 3 rd and 5 th spot welding plates 5 from left to right are grounded, the 10 state represents that the 2 nd, 4 th and 6 th spot welding plates 5 from left to right are grounded, and the 11 state represents that the six spot welding plates 5 are grounded simultaneously. The left peak on the coupling curve is stationary as the spot weld increases and the right peak is gradually shifted to the left.
The whole size of the superconducting circuit part is 20mm multiplied by 20mm, and the circuit diagram comprises a rectangular resonator, a Y-shaped interdigital capacitance adjustable coupling structure and an input feeder line and an output feeder line 8. Six spot-welded plates 5 are left below to be grounded so as to adjust the bandwidth of the filter. When the external Q value, the coupling coefficient and the resonator frequency are calculated, the band coupling structure is simulated together, and when the center frequency of the filter is about 3.8GHz, the band edge of the low frequency end is kept still, and the band edge of the high frequency end can be flexibly controlled. The 3dB bandwidth can be increased from 55.4MHz to 102.4MHz, an increase of more than 80%. Meanwhile, the return loss is between 11dB and 25.3dB, and the pass-band loss is between 0.06dB and 0.42 dB. Compared with the bandwidth reconfigurable filter which has been reported in the prior publication, the filter realizes the lowest pass-band loss.
The Y-shaped interdigital capacitor adjustable coupling structure realizes flexible control of coupling strength between resonators on the basis of keeping the advantages of low loss, simple manufacturing process and the like of the interdigital capacitor structure. The Y-shaped interdigital capacitance adjustable coupling structure can realize the control of the coupling coefficient between resonators through different grounding states of the interdigital capacitance spot welding plate 5. Most commonly used superconducting resonator structures, including linear (rectangular) resonators, hairpin resonators, stepped impedance resonators, single-spiral resonators, spin-out resonators, meander-line resonators, etc., can be loaded with interdigital capacitively-tunable coupling structures.
Y-shaped interdigital capacitance adjustable coupling structure and a superconducting filter designed by a linear resonator. The band edge of the low frequency end is kept still, the band edge of the high frequency end can be flexibly controlled, and the bandwidth is increased by more than 80%. Meanwhile, both return loss and pass-band loss are superior to those of the bandwidth reconfigurable filter which is reported in the prior publication.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023250353A1 (en) * | 2022-06-22 | 2023-12-28 | 1372934 B.C. Ltd. | Tunable superconducting filters |
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