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Simultaneous analog tuning of the series- and anti-resonances of acoustic wave resonators

A new electronically-reconfigurable hybrid acoustic-wave-lumped-element resonator (AWLR) is presented that enables simultaneous analog tuning of both the series- and anti-resonant frequencies. Acoustic-wave resonators are combined with lumped inductors and two tunable capacitors in such a way that physically small fully reconfigurable resonators with Qs in the order of 100s are generated. Due to the simultaneous control, AWLR-based filters with both reconfigurable transmission zeros and center frequencies are possible. A record 2.6% series-resonant frequency tuning is demonstrated and Qs up to 680 are shown.