A Novel Bulk Acoustic Wave Duplexer Based on Stacked Crystal Filters for WCDMA Handset Applications

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

Antenna and Microwave Systems (AMS) Group Universitat Autonoma de Barcelona (UAB), Barcelona, Spain
Email: [email protected]

Abstract. This work presents a novel duplexer for WCDMA handset applications based on stacked crystal filters. The use of this type of filters, instead of conventional ladder-type filters, allows to fulfil WCDMA requirements using lower order filters. The matching network of the proposed duplexer is composed of two single bulk acoustic wave resonators, instead of the quarterwave transmission line usually used in conventional duplexers based on ladder-type filters which enlarges the device.