Bandstop filters with power-dependent stopband attenuation
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsAdrew C. Guyette, Eric J. Naglich
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Abstract
Systems and method are provided for implementing filters whose response automatically and continuously reconfigures between an all-pass response and a bandstop response as the power level of signals within their bandwidth changes. Embodiments of the present disclosure allow high power signals within a designable bandwidth to be strongly attenuated while minimally affecting signals in adjacent bandwidths and further allow low power signals in the designable bandwidth to pass with minimal attenuation.
Claims20
A bandstop filter, comprising:
- a first resonator, coupled to a first port and weakly coupled to a second port;
- a variable gain amplifier (VGA) coupled to the second port;
- a second resonator, coupled to a third port and a power-activated coupling;
- and
- a third resonator, coupled to the power-activated coupling, wherein the power-activated coupling is configured to couple the third resonator to the second resonator when a high power signal is input into the first port.
A bandstop filter, comprising:
- a first resonator, coupled to a first port and weakly coupled to a second port;
- a variable gain amplifier (VGA) coupled to the second port;
- a second resonator, coupled to a third port and a power-activated coupling;
- a third resonator, coupled to the power-activated coupling;
- and
- a driver circuit, coupled to the second port, wherein the driver circuit is configured to:
- detect a signal from the second port, and
- drive the power-activated coupling to couple the second resonator to the third resonator if the signal is above a predetermined power threshold.
A bandstop filter, comprising:
- a first resonator, coupled to a tuner;
- a second resonator, coupled to the first resonator;
- and
- a detector, coupled to the tuner and weakly coupled to the second resonator, wherein the detector is configured to:
- sense a voltage present on the second resonator, and
- adjust the tuner to detune the first resonator if the voltage indicates that a high-power signal is present.
Dependencies are inferred from the claim text.