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Magnetic-adjustable dual-mode bandpass filter

A filter and mode band technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of size and production cost, frequency selectivity and poor stop-band characteristics, etc.

Inactive Publication Date: 2019-02-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tunable SIW filters that have been reported so far generally adopt a single-cavity single-mode design, which will undoubtedly cause problems in terms of size and production cost.
In addition, filters based on single-cavity single-mode often need to introduce additional cross-coupling to achieve transmission zeros, so they perform poorly in terms of frequency selectivity and stopband characteristics

Method used

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  • Magnetic-adjustable dual-mode bandpass filter
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  • Magnetic-adjustable dual-mode bandpass filter

Examples

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Embodiment

[0027] The structure of the magnetically tunable dual-mode bandpass filter in this embodiment is as follows figure 1 As shown, the dielectric substrate 2 adopts a Rogersduroid 6202 substrate with a thickness of 0.726 mm, and its relative dielectric constant ε r =2.9, loss tangent tanδ = 0.0015.

[0028] Specifically, in this embodiment, the dual-mode resonant cavity 5 is a rectangular substrate integrated waveguide resonator; the metalized through-hole array 4 is composed of cuboid metalized through holes, and the metalized through-hole array 4 is The length of the through hole is 0.9mm, and the distance between adjacent metallized through holes is 0.4mm; the through holes in the dual-mode resonant cavity 5 close to the boundary through hole array 4 and the ferrite in the through holes The shape is a rectangular parallelepiped; the first ferrite 6 and the second ferrite 7 both use microwave yttrium iron garnet (YIG) ferrite; the upper and lower surfaces of the ferrite are covered ...

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Abstract

The invention discloses a magnetic-adjustable dual-mode bandpass filter, and belongs to the field of microwaves and millimeter waves. The filter comprises a dielectric substrate and two metal layers,wherein the two metal layers are arranged on an upper surface and a lower surface of the dielectric substrate, the two metal layers are connected by a metal through hole array, the dielectric substrate, the two metal layers and the metal through hole array form a dual-mode resonant cavity, four through holes are formed in the dual-mode resonant cavity and are in close contact with parts around themetal through hole array, and ferrites are arranged in the through holes. With the adoption of the dual-mode resonant cavity, the circuit area of the filter is reduced, and the magnetic-adjustable dual-mode bandpass filter has the advantages of low insertion loss, good selectivity, good harmonic suppression and the like; with the application of the ferrites, the resonant frequency of the dual-mode resonant cavity is changed, and the coupling strength between two degenerate modes also can be controlled; and the working frequency of the filter moves towards a high-frequency direction with the increase of the intensity of an external bias magnetic field, the dynamic adjustable range is wide, and the bandwidth flexibility design can be achieved.

Description

Technical field [0001] The invention belongs to the field of microwave and millimeter waves, and specifically relates to a magnetically adjustable dual-mode bandpass filter. Background technique [0002] As a key component of future intelligent wireless communication and radar systems, tunable filters not only control useful signals and suppress harmful interference frequencies, but also support multi-channel communication and effectively solve the problem of spectrum congestion. In the future, the multi-frequency, miniaturization and integration application requirements of intelligent wireless communication and radar systems will put forward higher and higher requirements for the development of tunable filters in terms of performance and volume. The tunable filter is a new type of filter that can realize the structural reorganization and frequency tuning of the filter. Generally, the device characteristics and impedance effect of the filter are changed by loading tunable compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/218H01P1/217
CPCH01P1/218H01P1/217
Inventor 张巧利王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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