Radio frequency reconfigurable band-pass filter with wide frequency and wide adjustment range of broadband

Abstract

The invention discloses a novel radio frequency reconfigurable band-pass filter with a wide frequency and a wide adjustment range of broadband. The reconfigurable filter comprises an upper-layer microstrip structure, a middle-layer medium substrate and the lower-layer grounded metal. The upper-layer microstrip structure is composed of an input port, an input feed network, a cross adjustable multimode resonator, an output feed network and an output port which are connected in succession. The input feed network and the output feed network are both composed of a blocking condenser and a 50-ohm microstrip line. The cross adjustable multimode resonator is composed of two microstrip lines which are perpendicular to each other and six varactors with two ends of the varactors connected. The input feed network and the output feed network tap feed electricity respectively from the two varactors with two ends of the varactors in series connection of the left side and the right side of the multimode resonator. The reconfigurable filter has the advantages of being wide in central frequency and adjustment range of bandwidth and good in passband stability, and being capable of being reconfigured the broadbands with different central frequencies or a narrow-band band-pass filter and can be used for the front end of the reconfigurable radio frequency.

Description

technical field [0001] The invention relates to a novel radio-frequency electric-adjustable band-pass filter based on a varactor diode, in particular to a radio-frequency reconfigurable band-pass filter with wide frequency and wide bandwidth adjustment range. 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 tunable filters. [0003] Modern ultra-wideband radar and wireless communications requi...

AI Technical Summary

Problems solved by technology

Although the research on broadband filters has been carried out for many years and has achieved fruitful results, the development of broadband tunable 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

But so far it has not been reported how to apply multimode resonators to reconfigurable filters with tunable frequency and bandwidth

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

[0008] In addition to these two general 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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