Cascade multi-notch ultra-wideband filter circuit based on band-pass phase cancellation

Abstract

The invention discloses a cascaded multi-notch ultra-wideband filter circuit based on band-pass phase cancellation, which comprises a cascaded circuit based on high-pass phase cancellation and a cascaded circuit based on low-pass phase cancellation, and the cascaded circuit based on high-pass phase cancellation and the cascaded circuit based on low-pass phase cancellation are connected in series, the cascade circuit based on high-pass phase cancellation is cascaded with a high-pass phase shift network by adopting an N-stage resonant circuit, and the cascade circuit based on low-pass phase cancellation is cascaded with a low-pass phase shift network by adopting an N-stage resonant circuit; moreover, the resonance adjustment of each stage of resonance circuit is mutually independent, so that N independent and adjustable trapped waves and the like are respectively generated in a cascade circuit part with high-pass and low-pass phase cancellation; the number of components such as capacitors and inductors can be reduced, the system size is reduced, it can be guaranteed that insertion loss is hardly increased, and engineering implementation is facilitated; and meanwhile, the notch depth and the notch frequency can be continuously adjusted in the full frequency band easily, and the frequency selectivity is very excellent.

Description

technical field [0001] The invention relates to the field of filter circuits, and more specifically, to a cascaded multi-notch ultra-wideband filter circuit based on bandpass phase cancellation. Background technique [0002] At present, shortwave / ultrashort wave has been widely used in the field of communication. Shortwave / ultrashort wave stations mainly transmit analog AM signals between large platforms, including voice signals and short-term data communication services. With the development of informatization, the demand for communication is also increasing. Sometimes there are multiple shortwave / ultrashortwave high-power transmitters and receivers working at the same time on a large carrier. The amplitude ratio of the channel interference wave from the radio transmitter The amplitude of the signal is much larger, and the waveform of the interference wave is more complicated, and its fundamental frequency is not fixed. Although many optimization measures have been taken t...

AI Technical Summary

Problems solved by technology

[0004] To achieve wideband coverage, designers often use a mix of tuned and switched filter banks, but the bulk and inclusion of explicit switching signal paths introduces additional losses and often prevents multiband filter responses from being produced

At present, there is no single notch filter circuit that can cover the entire shortwave / ultrashort wave frequency band, and there is no public report that the UWB tuning ratio is greater than 5:1, which is used for co-site interference of shortwave / ultrashort wave stations

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