Design of a Coupled Resonator 3dB power divider based on BAW technology

Conventional power dividers based on quarter-wavelength lines are not adequate for the high level of miniaturization demanded for new wireless communications systems. The use of Bulk Acoustic Wave (BAW) technology overcomes the miniaturization issue. The design approach for an equal power divider based on BAW Coupled Resonator Filters (CRF) is introduced. A 3 dB power divider designed for W-CDMA receivers is presented. The proposed structure formed by three CRF sections shows a Chebyshev filtering response with 20 dB return loss. The designed CRF power divider simplifies the fabrication because almost all the multilayer films are uniform for all the CRF sections.