ADS Simulation Design of Narrowband FBAR Filter

In this short paper, four ideas of narrow band design of FBAR filter are discussed, including adding support layers, varying the area of series and parallel resonant units, connecting inductors in series and parallel, and varying the thickness of the top electrodes of different resonant units. A narrowband FBAR filter with center frequency of 2210 MHz, in-band loss of 1.6 dB, bandwidth of 10 MHz, out-of-band suppression of more than 34 dB is obtained in ADS simulation.