A Carrier Aggregation Pentaplexer with Optimized Phase Shifter Network in BAW Technologies

The Carrier Aggregation multiplexer is essential for radio frequency (RF) front-end system to meet the demand of Carrier Aggregation higher data rates. With the number of filters in multiplexer increasing, the insert loss will increase with the additional phase shifter in signal channels, which adjusts the impedance mismatch between different filters. This paper presents a Carrier Aggregation bulk acoustic wave (BAW) pentaplexer, designed by a new approach to optimize the phase shifter network. This new topology reduces the quantity and stage of phase shifters, improving the insert loss in signal channel and flexibility to design multiplexer.