A microwave agile active filter is presented which uses microwave integrated circuit (MIC) and monolithic microwave integrated circuit (MMIC) technologies. The resonators consist of a modified MIC half wavelength resonator λ/2 with an MMIC amplifier and phase shifter for feedback. They provide extremely low loss and high Q values. A microwave high-Q active bandpass filter is realised using a varactor diode for tuning.
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Trabelsi et al. (1998) studied this question.
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