Abstract

Microwave-frequency agile active resonators which, in a planar structure, can be realized using microwave integrated circuit (MIC) or monolithic MIC (MMIC) technologies are presented. Consisting of modified hairpin resonator feedback by an amplifier and a phase shifter, these resonators offer extremely-low-loss and high-Q-value resonators. The use of varactors permits a tuning of the resonant frequency as well as the bandwidth. Using such resonator, a bandstop filter with a rejection of 45 dB and a lossless bandpass filter with a return loss of 35 dB have been obtained at 3.1 GHz. >

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