Microwave notch filter using pin diode shunted YIG resonators

Abstract

Disclosed is a microwave notch filter which includes a plurality of serially connected YIG tuned resonators, each YIG resonator including a coupling wire and a PIN diode connected in parallel with the coupling wire. A first interconnect interconnects one end of the plurality of serially connected YIG resonators to an RF signal source, and a second inter-connect interconnects another end of the plurality of serially connected YIG band reject filters to a load. An inductor connects one of the interconnects to a circuit ground potential, and an inductor means connects the other interconnect to a DC voltage source, whereby the PIN diodes in the YIG resonators can be forward-biased or reverse-biased by an applied DC voltage. The DC voltage source selectively provides a positive DC voltage and a negative DC voltage which effectively controls the functioning of said YIG band reject filters. The PIN diodes are serially connected with like polarities whereby application of a negative voltage reverse-biases said diodes and application of a positive voltage causes said diodes to short-circuit said YIG resonators.

Dependencies are inferred from the claim text.