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Design of RF power combiner/divider based on surface acoustic wave longitudinally coupled resonators

A compact filtering power divider/combiner using surface acoustic wave (SAW) technology for low frequency applications is presented. The proposed power divider/combiner is based on parallel connected SAW coupled resonator filters providing a dual functional capability as well as a higher level of miniaturization. The designed structure is a 3 way power divider/combiner that exhibits a passband-filtering response. Simulated results demonstrated a return loss and insertion loss of 3.2 dB and 25 dB around 87 MHz with a relative bandwidth of 1%. The total area of the designed power combined/divider is 8.4×4.6 mm2 which is a relative size reduction of more than 70% in comparison to traditional Wilkinson power dividers operating at same frequency.