Ladder filter based on microelectronic BAW solidly mounted resonators

The ladder filters based on microelectronic BAW resonators with a Bragg reflector are designed. The BAW resonator represents a piezoelectric transducer based on zinc oxide films with thin-film electrodes of aluminum films and a Bragg reflector consisting of four pairs Mo-Al and one pair Mo-SiO
₂
. The ladder filter topology based on the single T-shaped link consisting of three SMR is presented. The filter operates at the central frequency of 4.54 GHz. It has the relative bandwidth of 4.4 % with the insertion loss of -2 dB and the out-of-band rejection is equal to -19 dB.