Radio frequency reconfigurable band-pass filter with wide bandwidth adjusting range and controllable performance

Abstract

The invention relates to a novel radio frequency reconfigurable band-pass filter with a wide bandwidth adjusting range and controllable performance. The reconfigurable band-pass filter comprises an upper micro-strip structure, a middle dielectric substrate and lower grounded metal, wherein the upper micro-strip structure is formed by connecting an input port, an input feed network, an input adjustable impedance matching circuit, a cross adjustable multi-mode resonator, an output adjustable impedance matching circuit, an output feed network and an output port in sequence; the cross adjustable multi-mode resonator consists of two micro-strip lines which are perpendicular to each other, and four terminated variable capacitance diodes; and each of the input adjustable impedance matching circuit and the output adjustable impedance matching circuit is formed by connecting a series variable capacitance diode and a parallel variable capacitance diode. The reconfigurable band-pass filter has the advantages of wide center frequency and bandwidth adjusting range, controllable filtering performance and the like, can be reconfigured into broad-band or narrow-band band-pass filters with different center frequencies, and can be used for a reconfigurable radio frequency front end.

Description

technical field [0001] The invention relates to a novel radio-frequency electrically adjustable band-pass filter based on varactor diodes, in particular to a radio-frequency reconfigurable band-pass filter with wide bandwidth adjustment range and controllable performance. Background technique [0002] ESC filter is one of the key technologies in hopping spread spectrum communication technology, anti-jamming radar, dynamic frequency allocation technology, multi-function receiver, spurious emission measurement, etc. Since World War II, electronically tunable filters have always been one of the research hotspots in various countries. In this regard, there have been some research reports, and electronically adjustable filters with various structures have been proposed. However, the rapid development of radar and communication technology in recent years has put forward higher performance requirements for electronically adjustable filters. [0003] Modern ultra-wideband radar an...

AI Technical Summary

Problems solved by technology

Although the research on wideband filters has been carried out for many years and achieved fruitful results, the development of wideband reconfigurable filters is extremely rare at home and abroad.

Obviously, the maximum bandwidth of 15% is far from meeting the needs of modern broadband communication systems

[0005] (2) When the center frequency or bandwidth changes, stable filtering performance cannot be maintained, mainly manifested in the large and small return loss, uneven passband ripple, etc., which affects the stability of the overall response of the system

But so far there is no report on how to apply multimode resonators in reconfigurable filters with tunable frequency and bandwidth

[0007] Aiming at the problem of maintaining stable filter performance when the center frequency and bandwidth are adjusted, so far there is no research report on how to stabilize or control the filter performance when the center frequency and bandwidth are adjusted

[0008] In addition to the above two common problems, some reconfigurable filters with frequency and bandwidth adjustment capabilities also have problems such as large insertion loss, many DC power supplies to control, and large volume.

[0009] In short, the current design of reconfigurable filters still needs to solve the problems of small bandwidth adjustment range and unstable performance during adjustment.

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