Capacitively coupled DC voltage switchable Barium Strontium Titanate solidly mounted resonator filter

Summary form only given, as follows. A DC voltage switchable Barium Strontium Titanate (BST) solidly mounted Bulk Acoustic Wave (BAW) capacitively coupled resonator filter with −3.66 dB insertion loss and −13.74 dB return loss has been demonstrated for the first time. The filter consists of two switchable BAW solidly mounted resonators coupled with a high-Q BST capacitor. The electromechanical coupling coefficient of the resonator is 6.34%, and the measured loaded series and parallel quality factors are 135 and 87, respectively.