Multi-band tunable microstrip band-pass filter

A filter and multi-band technology, applied in resonators, waveguide-type devices, electrical components, etc., can solve the problems of large volume, high system cost, single signal processing frequency band, etc. of multi-band systems, to simplify complexity and improve frequency Selective, fast-tuning effects
CN104037477AInactive Publication Date: 2014-09-10SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2014-09-10
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a multi-band tunable microstrip band-pass filter which comprises a three-layer structure: a front metal microstrip line, a middle dielectric plate layer, input and output ports and an earthing metal through hole, and a metal coating at the back of a dielectric plate, wherein the metal microstrip line is a symmetric resonator consisting of a half-wavelength uniform impedance line resonator and an open-loop dual-mode resonator; the two resonators share input and output coupling lines; and a variable capacitance diode is loaded between the tail end of the open-loop dual-mode resonator and the earthing metal through hole to form a tunable structure. The filter is compact in structure, low in passband insertion loss, steep in passband edge and high in selectivity, and meets a development trend of filter miniaturization.
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Description

technical field

[0001] The invention relates to a multi-band tunable microstrip bandpass filter, which belongs to the field of wireless communication systems. While realizing three adjustable passbands, it has high out-of-band suppression and satisfies the characteristics of miniaturization. Background technique

[0002] At present, the application frequency bands of communication systems are all concentrated in the low-frequency bands of radio frequency and microwave bands, which makes spectrum resources particularly crowded. In order to improve system capacity and avoid interference between the system and adjacent channels, it is very necessary to set up multiple communication frequency bands that can work simultaneously in the communication system. However, to realize dual-band or multi-band communication, each frequency band needs an independent RF front-end component, which makes the overall system larger in size and power consumption, and higher in cost. If the RF fro...

Claims

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