Acoustical Structures Based on the Thickened Edge Load Solution

Jordi VERDU, Pedro de PACO, Oscar MENENDEZ, Eden CORRALES

Universitat Aut_onoma de Barcelona (UAB) Telecommunications and System Engineering Department (TES)
E-mail: [email protected]

Abstract. The high performance and small size demands in the actual communication systems terminals, requires that the devices which conform them accomplish these features. Acoustical structures based on Bulk Acoustic Wave (BAW) resonators meets the demanded requirements. However, the electrical behavior of the BAW resonators presents some no desired effects due to lateral spurious resonances. In order to improve the electrical behavior, the thickened edge load solution is applied to the resonator, making the lateral spurious resonances being not generated. The improvement in the acoustical resonator can be translate to the acoustical structures based on them. A Stacked Crystal Filter based in the improved resonators has been simulated showing a very good transmission response compared with a SCF based on conventional BAW resonators.