A new design strategy for multi frequencies passive matching networks

In this contribution a new method to synthesise multi- band multi-frequencies matching networks is presented. The proposed approach is based on closed form and recursive relationships, allowing a direct CAD synthesis for a theoretical unlimited number of uncorrelated frequencies. Two experimental examples to design a single (2.45GHz) and double band (2 and 2.5GHz) matching networks controlling up to the respective third harmonics (e.g. the frequencies 2.45, 4.9 and 7.35 GHz in the former, 2, 2.5, 4, 5, 6 and 7.5 GHz in the last) are presented. For the network operating at 2 and 2.5GHz, a zero of transmission parameter between the two fundamental frequencies has been also controlled (S21<-18dB), together with optimum matching at both fundamentals (Sll<-25dB).