A New Design Methodology of a Triband Pi-Network Based on Multiresonant Networks

摘要

In a large number of multiband/multistandard applications, it is necessary to design matching networks that are capable of concurrently synthesizing impedances at different frequencies. In order to obtain this functionality, this paper presents a method based on multiresonant networks that is capable of providing impedance matching for frequency-dependent complex loads to the reference impedance , normally 50 . The capacity of multiresonant networks to generate an open circuit and a short circuit condition is used to respectively remove and insert inductors/capacitors in the network, and change the impedance generated by the matching network. To evaluate the potential of this proposal, triband matching networks operating at 915 MHz, 1.8 and 2.4 GHz were designed and evaluated from post-layout simulation results. According to the results, the target impedances were generated with reflection coefficients smaller than 0.2 and insertion losses less than 1 dB, which is acceptable in most RF applications. These results corroborate the potential of the proposal for the design of triband networks.