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Miniaturized superconducting filter with multiple transmission zero points

A technology for transmitting zero points and filters, which is applied in the field of electronics, can solve the problems of unfavorable system miniaturization, increase the area of ​​superconducting filters, etc., and achieve the effect of reducing the difficulty of simulation

Inactive Publication Date: 2012-07-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional additional cross-line method requires a fourth-order resonator for each pair of transmission zero points, which increases the area of ​​the superconducting filter. For details, please refer to the literature: T.Zuo, L. Fang, et al.'A self -equalized HTS filter for futuremobile communication applications', Physica C, Vol.459(2007), pp.1-4. If this structure wants to realize N pairs of transmission zeros, 4N resonant units are needed, which is not conducive to the miniaturization of the entire system

Method used

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  • Miniaturized superconducting filter with multiple transmission zero points
  • Miniaturized superconducting filter with multiple transmission zero points
  • Miniaturized superconducting filter with multiple transmission zero points

Examples

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Effect test

Embodiment 1

[0025] Example 1: Single microstrip resonator

[0026] Such as figure 1 As shown, the single microstrip resonator in the filter of the present invention is composed of the interdigital slow wave structure 10 and the paper clip resonant structure 11 combined. This structure facilitates the application of cross-line coupling to introduce cross-coupling between non-adjacent resonators, thereby providing a transmission zero point, which is beneficial to improve the performance of the filter. In addition, due to the existence of the interdigital slow-wave structure, the second harmonic component of the filter can be effectively suppressed.

[0027] The folding modes of the paper clip resonant structure of the microstrip resonator can be the same or different, and the effective length of the microstrip resonator is 1 / 2 wavelength.

[0028] Figure 4 (b) The second harmonic suppression amplitude response curve of the superconducting filter designed and manufactured for applying the single ...

Embodiment 2

[0029] Example 2: Cross-line coupled resonator group

[0030] Such as Figure 7 As shown, the cross-coupled resonator group between non-adjacent resonators is realized by cross-line coupling, that is, non-contact coupling microstrip line. Such as Image 6 As shown, some resonators are used as shared nodes (such as Image 6 60), respectively participate in 2 sets of cross-coupling, which can reduce the order of the filter, and further realize the miniaturization of the superconducting filter.

[0031] The effective length of each resonator of the aforementioned cross-coupled resonator group is half a wavelength.

[0032] The opening directions of the cross fingers of the resonators of the cross-coupled resonator group mentioned above may be the same or reversed.

[0033] Figure 5 The frequency response diagram of the resonator group for cross-coupling in the cross-line coupling method provided by the present invention. Among them, (a) is the frequency response diagram of the cross-c...

Embodiment 3

[0034] Embodiment 3: Cross-line coupling miniaturized superconducting filter with multiple transmission zeros

[0035] Such as figure 2 The superconducting filter with multiple transmission zeros with a shared node cross-coupling structure provided by the present invention is shown. The structure includes an input microstrip line 20, an output microstrip line 21, and three cross-line coupled resonator groups. The number of stages of this filter is tenth, and the effective length of each resonator is half a wavelength.

[0036] The input microstrip line and output microstrip line of the filter mentioned in the appeal and its adjacent resonators adopt an interpolation coupling method, and other methods such as tap connection methods can also be selected according to actual design requirements.

[0037] The substrate material of the filter mentioned in the appeal is MgO, but LaAlO can also be selected 3 Or sapphire is the substrate material.

[0038] image 3 The amplitude response curv...

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Abstract

Disclosed is a miniaturized superconducting filter with multiple transmission zero points, which is miniaturized while guaranteeing inner linearity phase characteristics of the pass band and outer high steepness of the pass band. The miniaturized superconducting filter consists of three groups of micro-strip resonators in cascade connection, each group includes four micro-strip resonators in cascade connection, and each resonator consists of an interdigital slow-wave structure and a clip resonance structure. A non-contact coupling micro-strip line is arranged between two resonators in each group, and the fourth resonator and the seventh resonator share the same node cross-coupling structure. The effective length of each resonator of the filter is one second of wavelength, and the substrate materials of the filter are MgO. The number of resonators for realizing six transmission zeros is reduced to 10 from 12 by the shared node cross-coupling structure, so that the filter is further miniaturized, and the problem of overlarge size of the existing filter with multiple transmission zeros is solved. Accordingly, the structure of the miniaturized superconducting filter is more applicable to manufacturing high-performance-index superconducting filters with multiple transmission zero points.

Description

Technical field [0001] The invention belongs to the field of electronic technology, and relates to a high-temperature superconducting band-pass filter with multiple transmission zeros for communication. The filter is made on a superconducting film. Background technique [0002] The superconducting filter has linear phase characteristics and good frequency selectivity through cross-coupling, but it also needs more resonators to achieve cross-coupling. The commonly used cross-coupling structure consists of four resonators cascaded , Usually called CQ (Cascaded Quadruplet) resonator group. When the cross-coupling polarities are different, this structure generates a pair of transmission zeros on the imaginary axis to improve the filter's out-of-band steepness; when the cross-coupling polarity is the same, this structure generates a pair of transmission zeros on the real axis To achieve linear phase. Therefore, in order to achieve a cross-coupling structure of a pair of transmission...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 何明乔忍夏侯海阎少林方兰赵新杰季鲁张旭
Owner NANKAI UNIV
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