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Method for implementing bandstop filter with tunable bridge

An implementation method and filter technology, applied in impedance networks, electrical components, multi-terminal-pair networks, etc., can solve the problems of single implementation method, complex structure, poor reliability, etc., and overcome the problems of single implementation method, small size, and channel insertion loss. small effect

Inactive Publication Date: 2013-07-31
王少夫
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Problems solved by technology

[0006] The adjustable band-rejection filter of the present invention relates to the field of electronic communication, and aims to solve the existing problems of the existing band-rejection filter such as single implementation method, complex structure, large volume, and poor reliability, and at the same time, in order to obtain a Tunable filter with capacitive coupling structure in design

Method used

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  • Method for implementing bandstop filter with tunable bridge
  • Method for implementing bandstop filter with tunable bridge
  • Method for implementing bandstop filter with tunable bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The center frequency of the designed filter is 1.78GHz, the bandwidth is 1Hz, the characteristic impedance of the input and output feeder is 50Ω, and the insertion loss of the filter is 0.04dB.

[0014] All capacitance values ​​are 1pF, inductance values ​​are 1nH, and the bridge capacitances are realized with varactors respectively. The circuit of the designed lumped element filter can be obtained as figure 2 As shown, when its bandwidth is fixed, the filter performance with adjustable center frequency is as image 3 shown, from image 3 It can be seen that the band-stop filter can be adjusted by using the bridge method, which fully meets the design performance requirements.

[0015] The designed adjustable bridge band-stop filter has been successfully used in a pulsed multi-channel receiver. After FSK modulation and demodulation, the output is good. The results of use show that the device has a good degree of suppression to the modulation pulse and noise level of ...

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Abstract

The invention discloses a tunable bandstop filter, relates to the field of electronic communication, and aims to solve the problem that the conventional bandstop filter is simplex in implementation method, complicated in structure, large in volume and poor in reliability. In order to obtain a tunable filter with a compact structure and good performance, a capacitor-coupled structure is adopted in a design. By a bridge network method, an LC (lumped component) electrically tunable band-pass filter is designed; the rectangle coefficient and the out-of-band rejection of the LC electrically tunable band-pass filter are improved; and the LC electrically tunable band-pass filter has a wide frequency adjusting range and good filtering performance.

Description

technical field [0001] The invention relates to an adjustable electric bridge band-stop filter, whose central frequency and bandwidth can be adjusted within a wide frequency range without causing performance degradation, and belongs to the technical field of electronic communication. Background technique [0002] A bandstop filter is a two-port network with frequency selective properties. As a new type of filter, tunable filter has been paid more and more attention. According to the tuning method, tunable filters can be divided into mechanical tuning, magnetic tuning and electric tuning. Tunable filters are widely used in mobile communication, microwave communication, aerospace and other fields because of their advantages such as fast tuning speed, wide operating frequency band, small size, easy integration and low cost. [0003] The tunable band-stop filter is a key component in the communication system. Due to the frequency selectivity of its resonator, the specified sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/12
Inventor 王少夫
Owner 王少夫
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