Stepped impedance resonator and broadband suppression superconducting microwave filter

Abstract

The invention discloses a stepped impedance resonator and a broadband suppression superconducting microwave filter, and relates to the technical field of microwave communication, the stepped impedance resonator comprises a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line which are rectangular; n third microstrip lines are uniformly distributed on the line length side of the first microstrip line; n fourth microstrip lines are uniformly distributed on the line length side of the second microstrip line; the third micro-strip line and the fourth micro-strip line are arranged in a crossed manner to form an interdigital structure region of the stepped impedance resonator; the fifth microstrip line is communicated with the first microstrip line and the second microstrip line; the broadband suppression superconducting microwave filter is composed of the stepped impedance resonators provided by the invention. The stepped impedance resonator and the wide bandwidth suppression superconducting microwave filter can simultaneously have a wide passband characteristic and a high out-of-band suppression characteristic.

Description

Technical Field

[0001] The present application relates to the field of microwave communication technology, and in particular to a step impedance resonator and a wide bandwidth suppression superconducting microwave filter. Background Art

[0002] With the rapid development of wireless communication technology, more and more communication frequency bands are being developed and utilized, making the space electromagnetic environment very complex. The performance requirements of microwave filters for microwave receiver front ends that pursue high performance are also getting higher and higher. The ideal microwave filter has a rectangular filtering characteristic, which can filter out the signals of the required frequency band and completely filter out the signals of the remaining frequency bands. However, for actual microwave filters, due to factors such as microwave loss in its metal materials, the filtering performance of the actual microwave filter is quite different from that of the ideal filter. Especially when processing broadband signals, wireless communication systems are often required to be provided with microwave filters with wide passband characteristics, and microwave filters with wide passband characteristics should have the characteristics of low loss in the wide passband and high suppression outside the passband. The design of wide passband microwave filters usually requires strong coupling between resonators, strong coupling between resonators and input and output ends, and strong electromagnetic coupling between resonators to achieve the purpose of passband widening. However, in the existing related technologies, under the condition of strong coupling between resonators, there is still a problem that the responses of different frequencies in the passband are difficult to adjust to be consistent. In addition, due to the inherent multi-order resonance characteristics of planar microstrip structure resonators, the design of the out-of-band suppression of filters formed based on planar microstrip structure resonators is a difficult problem.

[0003] Therefore, although the existing microwave filter design technology can realize a wide passband filter, the filter has a low degree of suppression of out-of-band signals and the stopband frequency is not wide enough because the harmonic frequency of the ordinary resonator is twice the fundamental frequency, which makes the out-of-band suppression characteristics of the existing microwave filter design technology not high. Moreover, the filter circuit that focuses on the filter's wide suppression performance is usually only applicable to narrowband filters or filters with normal bandwidth, and is not applicable to wide passband microwave filters. Summary of the invention

[0004] The purpose of the present application is to provide a stepped impedance resonator and a wide bandwidth suppression superconducting microwave filter, which can have both wide passband characteristics and high out-of-band suppression characteristics.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a step impedance resonator, comprising: a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line, all of which are rectangular; the first microstrip line has the same shape as the second microstrip line; the third microstrip line has the same shape as the fourth microstrip line;

[0007] N third microstrip lines are evenly distributed on one side of the line length of the first microstrip line; the line width side of the third microstrip line is connected to the first microstrip line; N fourth microstrip lines are evenly distributed on one side of the line length of the second microstrip line; the line width side of the fourth microstrip line is connected to the second microstrip line; the third microstrip line and the fourth microstrip line are cross-arranged to form an interdigitated structure region of a step impedance resonator; the line width side of the fifth microstrip line is connected to the other side of the line length of the first microstrip line; the other side of the line width of the fifth microstrip line is connected to the other side of the line length of the second microstrip line.

[0008] Optionally, the line width of the first microstrip line is much larger than the line width of the third microstrip line and the line width of the fifth microstrip line.

[0009] Optionally, a projection of the third microstrip line in the interdigitated finger structure region completely overlaps with a projection of the fourth microstrip line.

[0010] Optionally, the vertical distance between the third microstrip line and the fourth microstrip line in the interdigitated finger structure area is a first preset spacing; the horizontal distance between the line width side of the third microstrip line away from the first microstrip line and the line length side of the second microstrip line and the horizontal distance between the line width side of the fourth microstrip line away from the second microstrip line and the line length side of the first microstrip line are both second preset spacing.

[0011] Optionally, the length of the first microstrip line is half the length of the fifth microstrip line; the width of the third microstrip line is the same as the width of the fifth microstrip line; and the first preset spacing is the same as the second preset spacing.

[0012] Optionally, the step impedance resonator is made of high temperature superconducting material.

[0013] In a second aspect, the present application provides a wide bandwidth suppression superconducting microwave filter, comprising: an input feed line, an output feed line, and a plurality of step impedance resonators;

[0014] The step impedance resonator comprises: a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line, all of which are rectangular; the first microstrip line has the same shape as the second microstrip line; the third microstrip line has the same shape as the fourth microstrip line;

[0015] N third microstrip lines are evenly distributed on one side of the line length of the first microstrip line; the line width side of the third microstrip line is connected to the first microstrip line; N fourth microstrip lines are evenly distributed on one side of the line length of the second microstrip line; the line width side of the fourth microstrip line is connected to the second microstrip line; the third microstrip line and the fourth microstrip line are cross-arranged to form an interdigitated structure region of a step impedance resonator; the line width side of the fifth microstrip line is connected to the other side of the line length of the first microstrip line; the line width side of the fifth microstrip line is connected to the other side of the line length of the second microstrip line;

[0016] The multiple step impedance resonators are divided into two rows, and the step impedance resonators in each row are arranged in parallel in sequence, the step impedance resonators in the upper row are directed downward, and the step impedance resonators in the lower row are directed upward, and the projection of the step impedance resonators in the upper row does not completely overlap with the projection of the step impedance resonators in the lower row; the upper and lower rows of step impedance resonators are coupled in a concave-convex meshing manner through the fifth microstrip line; the input feeder is arranged at the first step impedance resonator from left to right of the arranged step impedance resonators, and the output feeder is arranged at the last step impedance resonator from left to right of the arranged step impedance resonators.

[0017] Optionally, the vertical distance between the fifth microstrip lines of the upper and lower rows of step impedance resonators is a third preset distance.

[0018] Optionally, the wide bandwidth suppression superconducting microwave filter is made of high temperature superconducting material.

[0019] Optionally, the manufactured wide-bandwidth suppression superconducting microwave filter is packaged in a metal packaging box, and the input port and each output port of the multiplexer circuit are connected through a microwave coaxial connector.

[0020] According to the specific embodiments provided in this application, this application has the following technical effects:

[0021] The present application provides a step impedance resonator and a wide bandwidth suppression superconducting microwave filter, specifically a new type of interdigital capacitor resonator that introduces a step impedance structure, and a superconducting microwave filter with wide passband and high wideband out-of-band suppression is designed using the resonator structure. The present application forms an interdigital capacitor by cross-arranging the third microstrip line and the fourth microstrip line to form an interdigital structure area of ​​the step impedance resonator, and improves the multiplication ratio by loading the step impedance resonator with the interdigital capacitor. Based on the step impedance resonator of the present application, a meandering line structure is introduced to perform concave-convex meshing coupling between the fifth microstrip lines of different step impedance resonators, thereby optimizing the coupling mode of the traditional resonator and obtaining strong adjacent coupling, thereby making the wide bandwidth suppression superconducting microwave filter formed by coupling have both wide passband characteristics and high out-of-band suppression characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the step impedance resonator provided in this application;

[0024] Figure 2 A schematic diagram of the relationship between the step impedance resonator coupling structure and the coupling strength and coupling length provided in the present application;

[0025] Figure 3 A schematic diagram of the structure of a wide bandwidth suppression superconducting microwave filter provided in this application;

[0026] Figure 4 A schematic diagram showing a comparison between the measured results and the simulation results of the wide bandwidth suppression superconducting microwave filter provided in this application;

[0027] Figure 5 This is a cross-sectional view of the package of the wide bandwidth suppression superconducting microwave filter provided in the present application. DETAILED DESCRIPTION

[0028] In order to solve the problem that the wide passband characteristics and high out-of-band suppression characteristics mentioned in the background technology cannot be possessed at the same time, the wide passband microwave filter is often designed with a resonator structure with a high multiplication ratio. Commonly used resonator structures with a high multiplication ratio include step impedance structure, interleaved capacitor structure and quarter-wavelength structure. Usually, starting from the overall design of the filter, methods such as staggered multiplication and introduction of notch points are proposed to improve the wide suppression capability of the filter. Among them, the resonator with a step impedance structure can control the multiplication ratio of the designed resonator within a certain range by controlling the length ratio and impedance ratio of the high and low impedance parts, and has a high degree of design freedom. The interleaved capacitor structure refers to the introduction of densely arranged adjacent microstrip line structures in the resonator to form a quasi-lumped circuit equivalent to a capacitor. The capacitance value of the structure will increase with the increase of the number and length of interleaved fingers. Since the interleaved capacitor structure has different equivalent capacitance values ​​at the base frequency and the multiplication frequency, the impact on the base frequency is much greater than the impact on the multiplication frequency, which can effectively improve the multiplication ratio of the resonator. The quarter-wavelength structure changes the boundary conditions of the resonator by grounding one end of the resonator, so that the electrical length of the original half-wavelength resonator can be reduced to a quarter of the wavelength. At the same time, due to the existence of the grounding terminal, the even harmonics of the fundamental frequency of the resonator are suppressed, and the first high-order harmonic frequency of the resonator is three times the fundamental frequency of the resonator, thereby effectively pushing up the parasitic passband frequency of the resonator. The staggered frequency-doubling filter design method is to design the resonator structure so that the fundamental frequency of the cascaded resonators in the circuit is the same, while the double frequency is at a different frequency. The entire filter circuit has good passband characteristics at the fundamental frequency, but at the double frequency, a passband cannot be formed due to the mutual suppression of different resonators, thereby improving the broadband suppression range of the filter. The filter design method that introduces a notch point, in view of the parasitic passband problem of the filter, obtains high suppression characteristics at the parasitic passband by introducing a notch point in the circuit. The structure that introduces the notch point includes adding a specific stopband structure at the feed line, and generating a transmission zero point through a coupled line structure between resonators.

[0029] In the above resonator and filter design methods, the optimization of the resonator structure has a very high suppression on the filter's stopband, but the stopband will be cut off at the parasitic frequency. At the same time, the filter coupling design needs to meet the coupling characteristics of the resonator, and the design of a wide passband is very difficult. Although the method of parasitic passband suppression from the overall filter can have a wide stopband, the suppression degree of the stopband is generally not high.

[0030] In order to solve the limitation that traditional self-interdigitating resonators are not easy to form strong coupling, this application proposes a step impedance resonator loaded with interdigitating capacitors to improve the multiplication ratio, introduces a meandering line structure (convex-concave meshing coupling) and optimizes the resonator coupling method to obtain strong adjacent coupling, so as to solve the design problem of microwave filters with wide bandwidth suppression characteristics.

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figure 1 As shown, the step impedance resonator disclosed in the present application is a finger-inserted capacitor structure resonator that introduces a step impedance structure, specifically including: a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line, all of which are rectangular. Among them, the shape of the first microstrip line is the same as the shape of the second microstrip line, and the shape of the third microstrip line is the same as the shape of the fourth microstrip line. The middle part of the step impedance resonator of the present application is the finger-inserted structure area, which is composed of the third microstrip line and the fourth microstrip line. The width of the microstrip line connected to the finger-inserted structure area is increased to become a low-impedance area, namely the first microstrip line and the second microstrip line. The low-impedance areas are connected by a high-impedance microstrip line, namely the fifth microstrip line.

[0034] Specifically, N third microstrip lines are evenly distributed on one side of the line length of the first microstrip line, and the line width side of the third microstrip line is connected to the first microstrip line. Correspondingly, N fourth microstrip lines are evenly distributed on one side of the line length of the second microstrip line, and the line width side of the fourth microstrip line is connected to the second microstrip line. The third microstrip line and the fourth microstrip line described in the present application are arranged crosswise to form an interdigitated structure area of ​​a step impedance resonator, that is, the interdigitated structure area is a third microstrip line, a fourth microstrip line, a third microstrip line, a fourth microstrip line... in the vertical direction, and is arranged in a cycle. One side of the line width of the fifth microstrip line is connected to the other side of the line length of the first microstrip line; the other side of the line width of the fifth microstrip line is connected to the other side of the line length of the second microstrip line.

[0035] As a specific embodiment, the line width w2 of the first microstrip line of the present application is much larger than the line width w3 of the third microstrip line and the line width w1 of the fifth microstrip line. The projection of the third microstrip line in the interdigitated structure area completely overlaps with the projection of the fourth microstrip line.

[0036] In addition, the vertical distance between the third microstrip line and the fourth microstrip line in the interdigital structure area constituted by the present application is the first preset spacing g1; the horizontal distance between the line width side of the third microstrip line away from the first microstrip line and the line length side of the second microstrip line and the horizontal distance between the line width side of the fourth microstrip line away from the second microstrip line and the line length side of the first microstrip line are both the second preset spacing g2. The line width w3 of the third microstrip line and the vertical distance between the third microstrip line and the fourth microstrip line are the first preset spacing g1, which determine the capacitance characteristics of the interdigital structure area. The line length 2L1 of the high impedance microstrip line (fifth microstrip line) and the line length L2 of the low impedance area determine the impedance ratio and the equivalent electrical length of the step impedance structure. As a specific embodiment, by controlling the parameters of the step impedance resonator to be: L1=L2=2.56mm, g1=g2=0.04mm, w1=w3=0.04mm, the lengths of the third microstrip line and the fourth microstrip line in the finger structure area are l=0.52mm, so that the maximum ratio of the first harmonic frequency and the fundamental frequency of the step impedance resonator reaches 5.6:1.

[0037] Compared with conventional metals, the surface resistance of high-temperature superconducting materials in the microwave frequency band is two to three orders of magnitude smaller, which is very small. Resonators and filters made of high-temperature superconducting materials have a series of advantages such as low loss and high frequency selectivity, which can greatly improve the sensitivity of microwave receivers and other performance. Therefore, the step impedance resonator of this application is a high-temperature superconducting material.

[0038] Based on the step impedance resonator provided in the present application, referred to as the resonator, the present application also discloses a wide-bandwidth suppression superconducting microwave filter, including: an input feed line, an output feed line and a plurality of step impedance resonators.

[0039] like Figure 2 As shown, the present application proposes a high impedance meandering line structure of the resonator, and by setting the fifth microstrip line into a meandering line structure, a concave-convex meshing coupling is performed to achieve strong coupling between resonators. Figure 2 As shown in (a), Figure 2 The coupling length s of the adjacent resonator coupling regions and the third preset spacing d in (a) can be adjusted according to the filter bandwidth design requirements, so that the coupling strength adjustment range reaches more than 3 times, such as Figure 2 In addition, the total width of the meander line is consistent with the width of the resonator. The coupling length s and the third preset spacing d in the figure are the key to determining the strong coupling characteristics. Other parameters have little effect on the coupling strength, which is conducive to determining the circuit arrangement method.

[0040] Figure 2In (b), the coupling coefficient is simulated within the range of coupling length s = 0.15mm to s = 0.55mm. The curve at the bottom of the figure under the condition of d = 0.28mm is marked by an inverted triangle, and the coupling coefficient is adjustable between 0.052-0.065, with an adjustment range of Δ1 = 0.013. The curve at the top of the figure under the line d = 0.04mm is marked by a square, and the coupling coefficient is adjustable between 0.095-0.150, with an adjustment range of Δ1 = 0.052, thereby increasing the coupling strength adjustment range by more than 3 times.

[0041] based on Figure 2 The coupling form described in the above is used to couple multiple step impedance resonators to obtain a wide bandwidth suppression superconducting microwave filter, referred to as a superconducting microwave filter. Using the microwave filter coupling matrix design method of the present application, based on the proposed step impedance resonator structure, 6th order, 8th order and higher order microwave filters can be designed, which have wide passband characteristics and high out-of-band suppression characteristics. Figure 3 As shown, specifically, the present application divides a plurality of step impedance resonators into two rows, and each row of step impedance resonators is arranged in parallel in sequence, the step impedance resonators in the upper row are oriented downward, and the step impedance resonators in the lower row are oriented upward, and the projection of the step impedance resonators in the upper row does not completely overlap with the projection of the step impedance resonators in the lower row. The upper and lower rows of step impedance resonators are coupled in a concave-convex meshing manner through the fifth microstrip line. The input feeder is arranged at the first step impedance resonator from left to right of the arranged step impedance resonators, and the output feeder is arranged at the last step impedance resonator from left to right of the arranged step impedance resonators. Among them, the vertical distance between the fifth microstrip lines of the upper and lower rows of step impedance resonators is the third preset spacing d. Since the step impedance resonator of the present application is a high-temperature superconducting material, the wide-bandwidth suppression superconducting microwave filter of the present application is also a high-temperature superconducting material, and the circuit substrate uses a magnesium oxide or lanthanum aluminate substrate.

[0042] As a specific embodiment, Figure 3 As shown, the present application designs a 10th order broadband superconducting filter with an operating frequency of about 2.1 GHz, and the entire filter circuit is 26 mm long and 10 mm wide. Figure 4 From the comparison diagram of the measured results and simulation results of the wide-bandwidth suppression superconducting microwave filter, it can be seen that the passband bandwidth of the filter is 480MHz, and the suppression degree outside the passband up to 8.7GHz is better than 80dB. Figure 4The S11 parameter represents the strength of the reflected signal of the filter. The lower the reflection in the filter passband, the better the performance. The S21 parameter represents the strength of the signal passing through the filter. The closer the strength is to 0dB in the filter passband, the lower the loss. Outside the passband up to a frequency of about 8.5GHz, S21 is lower than -80dB, which means that there is strong suppression outside the passband and the suppression frequency range is very wide. Figure 4 The actual test results and the results of the dedicated microwave simulation software Sonnet are shown in the figure. The design results are consistent with the measured results.

[0043] like Figure 5 As shown, after the superconducting microstrip filter is manufactured by the above method, it is installed in a metal packaging box, and a microwave coaxial connector is used to connect the input port and each output port of the multiplexer circuit.

[0044] Since the common filter design method is to conduct joint optimization simulation of resonators, coupling spacing, and external coupling parameters for the wide passband filter design goal, too many parameters are optimized at the same time, the simulation efficiency is low, and the simulation results are not highly consistent with the goals. The resonator structure of the present application can optimize different parameters in a distributed manner. In view of the wide suppression characteristic requirements, the step impedance structure and the finger structure of the resonator are optimized; then, in view of the wide passband requirements, the second step is to optimize the coupling length and spacing between adjacent resonators to obtain the required strong coupling coefficient; the third step is to optimize the structure and position of the first and last resonators and the feeders at both ends to obtain an external coupling that meets the requirements. The resonator proposed in the present application is conducive to the step-by-step design of filters, and has the advantages of high design efficiency, stable design results, and easy expansion of the design.

[0045] In summary, the present application proposes a design of a superconducting filter using a stepped impedance structure, an interdigitated capacitor resonator and a wide bandwidth suppression, which improves the multiplication ratio by loading a step impedance resonator with interdigitated capacitors, proposes the conditions for the resonator to achieve the highest multiplication ratio, and establishes an equivalent model of the resonator based on the charge distribution of the resonator. The meandering line structure is introduced and the resonator coupling mode is optimized to obtain strong adjacent coupling, and a filter design method with a wide passband suppression characteristic is obtained, which can be used to design a wide passband filter with a planar microstrip structure, and has the advantages of high design efficiency, stable design results, and easy design expansion.

[0046] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A step impedance resonator, characterized in that: include: A first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line are all rectangular; the shape of the first microstrip line is the same as the shape of the second microstrip line; The shape of the third microstrip line is the same as the shape of the fourth microstrip line; N third microstrip lines are evenly distributed on one side of the line length of the first microstrip line; the line width side of the third microstrip line is connected to the first microstrip line; N fourth microstrip lines are evenly distributed on one side of the line length of the second microstrip line; the line width side of the fourth microstrip line is connected to the second microstrip line; the third microstrip line and the fourth microstrip line are cross-arranged to form an interdigitated structure region of a step impedance resonator; the line width side of the fifth microstrip line is connected to the other side of the line length of the first microstrip line; the other side of the line width of the fifth microstrip line is connected to the other side of the line length of the second microstrip line.

2. The step impedance resonator according to claim 1, characterized in that: The line width of the first microstrip line is much larger than the line width of the third microstrip line and the line width of the fifth microstrip line.

3. The step impedance resonator according to claim 1, characterized in that: The projection of the third microstrip line in the interdigitated finger structure area completely overlaps with the projection of the fourth microstrip line.

4. The step impedance resonator according to claim 1, characterized in that: The vertical distance between the third microstrip line and the fourth microstrip line in the interdigitated finger structure area is a first preset distance; The horizontal distance between the line width side of the third microstrip line away from the first microstrip line and the line length side of the second microstrip line and the horizontal distance between the line width side of the fourth microstrip line away from the second microstrip line and the line length side of the first microstrip line are both second preset distances.

5. The step impedance resonator according to claim 4, characterized in that: The line length of the first microstrip line is half of the line length of the fifth microstrip line; the line width of the third microstrip line is the same as the line width of the fifth microstrip line; and the first preset spacing is the same as the second preset spacing.

6. The step impedance resonator according to claim 1, characterized in that: The step impedance resonator is made of high temperature superconducting material.

7. A wide bandwidth suppression superconducting microwave filter, characterized in that: include: An input feed line, an output feed line, and a plurality of step impedance resonators; The step impedance resonator comprises: a first microstrip line, a second microstrip line, a third microstrip line, a fourth microstrip line and a fifth microstrip line, all of which are rectangular; the first microstrip line has the same shape as the second microstrip line; the third microstrip line has the same shape as the fourth microstrip line; N third microstrip lines are evenly distributed on one side of the line length of the first microstrip line; the line width side of the third microstrip line is connected to the first microstrip line; N fourth microstrip lines are evenly distributed on one side of the line length of the second microstrip line; the line width side of the fourth microstrip line is connected to the second microstrip line; the third microstrip line and the fourth microstrip line are cross-arranged to form an interdigitated structure region of a step impedance resonator; the line width side of the fifth microstrip line is connected to the other side of the line length of the first microstrip line; the line width side of the fifth microstrip line is connected to the other side of the line length of the second microstrip line; The multiple step impedance resonators are divided into two rows, and the step impedance resonators in each row are arranged in parallel in sequence, the step impedance resonators in the upper row are directed downward, and the step impedance resonators in the lower row are directed upward, and the projection of the step impedance resonators in the upper row does not completely overlap with the projection of the step impedance resonators in the lower row; the upper and lower rows of step impedance resonators are coupled in a concave-convex meshing manner through the fifth microstrip line; the input feeder is arranged at the first step impedance resonator from left to right of the arranged step impedance resonators, and the output feeder is arranged at the last step impedance resonator from left to right of the arranged step impedance resonators.

8. The wide bandwidth suppression superconducting microwave filter according to claim 7, characterized in that: The vertical distance between the fifth microstrip lines of the upper and lower rows of step impedance resonators is a third preset distance.

9. The wide bandwidth suppression superconducting microwave filter according to claim 7, characterized in that: The wide bandwidth suppression superconducting microwave filter is made of high temperature superconducting material.

10. The wide bandwidth suppression superconducting microwave filter according to claim 7, characterized in that: The manufactured wide bandwidth suppression superconducting microwave filter is packaged in a metal packaging box, and the input port and each output port of the multiplexer circuit are connected through a microwave coaxial connector.

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