Novel quadplexer synthesis procedure

In this work a quadplexer (QPX) is designed by matching two duplexers (DPX) at 3GPP bands 3 and 7. The challenge in combining duplexers is the possibly high dimension of the optimization problem and the large number of candidate topologies. The authors discovered that antenna matching synthesis tool scope can be extended to multiplexer design to resolve the above challenges. The results reveal that an automated topology synthesis can identify redundancy in the matching circuit topology, and eventually lead to superior performance with less discrete matching elements provided by vendors. The synthesis can be carried out using vendor libraries, or, after proper topology identification, also using distributed elements. Tolerance analysis is readily available for determination of least sensitive matching circuit.