A Planar Tunable Bandpass-Bandstop Filter with Controllable Bandwidth

A band-stop filter, planar technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problem of uncontrollable bandwidth, and achieve the effect of convenient wide-range adjustment, light weight and simple structure

Inactive Publication Date: 2018-11-02
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In April 2013, William J.Chappell published "New Bandstop Filter CircuitTopology and Its Application to Design of a Bandstop-to-Bandpass SwitchableFilter" in the top journal "IEEE TRANSACTIONSON MICROWAVE THEORY AND TECHNIQUES" in this technical field. And the filter also realizes the switching between bandpass filter and bandstop filter through RF MEMS switch, but its bandwidth cannot be controlled

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  • A Planar Tunable Bandpass-Bandstop Filter with Controllable Bandwidth
  • A Planar Tunable Bandpass-Bandstop Filter with Controllable Bandwidth
  • A Planar Tunable Bandpass-Bandstop Filter with Controllable Bandwidth

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with specific examples.

[0032] The core content of the bandwidth-controllable planar band-pass-band-stop filter of the present invention is to control the voltage at both ends of the PIN diode to be in a conduction or isolation state, and to perform band-pass filter and band-stop filter transmission. For the conversion of characteristics, the bandpass filter is mainly composed of two 1 / 2 open-circuit wavelength resonators; the band-stop filter is mainly composed of two typical 1 / 4 open-circuit resonators. The adjustment of the central frequency is realized by controlling the voltage at both ends of each varactor, and the bandwidth is controlled by adjusting the ratio of the capacitance values ​​of the varactors at both ends of the half-wavelength open branch.

[0033] Such as figure 1As shown, the planar adjustable bandpass-bandstop filter is fabricated on a double-sided copper-clad microstrip board...

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Abstract

The invention discloses a planar adjustable bandpass-bandstop filter with a controllable bandwidth. The planar adjustable bandpass-bandstop filter mainly comprises an input port (port 1), an output port (port 2), two 1 / 2 wavelength open circuit resonators, variodes, a PIN diode, a bias DC circuit and the like. Conversion of bandpass-bandstop characteristics can be conveniently adjusted through controlling the PIN diode; and the center frequency of the filter can be adjusted through adjusting the variodes. Meanwhile, the function of the controllable bandwidth can be achieved by adjusting the ratio of capacitance values of the variodes at two ends of each resonator. The planar adjustable bandpass-bandstop filter can be switched between a bandpass filter and a bandstop filter, and has the advantages of being controllable in center frequency, controllable in bandwidth, simple in structure, small in size, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of high-frequency devices, in particular to a planar adjustable bandpass-bandstop filter with controllable bandwidth. Background technique [0002] In recent years, with the popularity of wireless electronic products in people's lives, miniaturization and low cost have become the trend of electronic products. On the other hand, with the rapid development of electronic information, the increasingly scarce spectrum resources are becoming more and more scarce. In order to improve the communication capacity and reduce the signal crosstalk between adjacent channels, higher requirements are put forward for the selectivity and integration of filters. The microstrip filter meets these requirements. [0003] Tunable filters play an important role in reducing system size, complexity, and cost because they enable multiple frequency ranges on one structure. The tunable filter can be divided into the following three ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 陈付昌李润铄
Owner SOUTH CHINA UNIV OF TECH
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