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Integrated wave filter for high temperature hyperconductive band-stop and band-pass

A technology of band-stop filter and band-pass filter, applied in waveguide devices, electrical components, circuits, etc. Difficult design and other issues to achieve good out-of-band suppression, narrow passband, and reduced volume and weight

Inactive Publication Date: 2007-03-14
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the integrated filter also brings some difficulties in the design, mainly because the transmission characteristics of the two filters may interfere with each other, for example, the passband of the band-stop filter may not be flat enough, which causes the passband of the band-pass filter to be uneven. Additional loss, another example is that after the integration of the two filters, adjacent frequency interference may be formed due to far-field coupling, etc.

Method used

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  • Integrated wave filter for high temperature hyperconductive band-stop and band-pass
  • Integrated wave filter for high temperature hyperconductive band-stop and band-pass
  • Integrated wave filter for high temperature hyperconductive band-stop and band-pass

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Embodiment 1

[0031] To design a high-temperature superconducting integrated filter bank, the central frequency of the passband is required to be f 1 =1715MHz, bandwidth Δf=15MHz, at f 2 = Around 2.5GHz, the impedance should be above -90dB.

[0032] Design of high temperature superconducting bandpass filter: select the quasi-elliptic function model, and use related programs to obtain its theoretical curve (as shown in Figure 4) and related coupling parameters. Choose a hairpin-type zigzag resonator with a length of approx. (ε is the dielectric constant of the substrate). Use Sonnet software to simulate the resonator to obtain its simulation frequency, modify the length of the broken line of the resonator until the simulation frequency of the resonator is f 1 =1715MHz.

[0033] Arrange 8 such resonators in a certain order to form a quasi-elliptic bandpass filter. The coupling parameters between the resonators are as close as possible to the theoretical values ​​through simulation. The...

Embodiment 2

[0037] The design requirements are the same as those in Example 1. The Chebyshev function model is selected for the high-temperature superconducting bandpass filter, and its theoretical curve (as shown in FIG. 9 ) and related coupling parameters are obtained by using related programs. Choose a clip-type broken-line resonator, and make the simulation frequency of the resonator f by simulation 1 =1715MHz. Arrange 8 such resonators in a straight line to form a Chebyshev-type bandpass filter, and through the method in Example 1, integrate it with the bandstop filter described in Example 1 to obtain the Design diagram of integrated filter with band-stop and Chebyshev-type band-pass.

Embodiment 3

[0039] The result designed in Example 1 is made into a photolithography template, the high-temperature superconducting double-sided film material used is YBCO, and the dielectric substrate is LaAlO 3 , the thickness of the substrate is 0.5mm, and the thickness of the superconducting film is about 0.6-0.7nm. The high temperature superconducting thin film is subjected to photolithography by a conventional method, and after the photolithographic mask on the surface of the high temperature superconducting thin film is formed, it is dry-etched by an ion etching machine. A high temperature superconducting filter can be obtained by cutting the dry-etched high temperature superconducting thin film into a required size with a semiconductor dicing machine and cleaning it.

[0040] Figure 11 and Figure 12 are the actual measurement results of the integrated filter at 77K. Figure 11 shows the bandpass characteristics, the in-band differential loss is only 0.1-0.2dB, the out-of-band impeda...

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Abstract

This invention discloses one high temperature superconductive rejection and pass integral filter, which comprises superconductive filter and pass filter, wherein, the pass filter is composed of pass resonance device; the rejection filter and the pass filter are integrated into same one superconductive film base with adjustable frequency section; the pass and rejection filters input and output ends have resistance as 50omega with distance caring about two filters and high superconductive film base sizes.

Description

technical field [0001] The invention belongs to the field of microwave engineering and relates to a high-temperature superconducting band-stop filter and an integrated filter of the high-temperature superconducting band-pass filter, which can be used in microwave circuits with special requirements. Background technique [0002] Since the discovery of high-temperature superconductors, scholars engaged in microwave work have paid great attention to the microwave properties of this material. Around the 1990s, it was confirmed from experiments that the surface resistance of high-temperature superconductors is better than that of conventional conductors. For example, in the range of 1 to 3G, the surface resistance of high-temperature superconductors is only 1% to 1‰ of copper. Since the early 1990s, various high-temperature superconducting microwave devices have been born one after another, all of which have shown excellent performance, among which the most mature ones are variou...

Claims

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Application Information

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IPC IPC(8): H01P1/205
Inventor 孙亮张强黄建冬孟庆端李翡李顺洲李春光张雪强黎红何艾生何豫生
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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