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An improved design method for asymmetric RF MEMS tunable filter utilizing admittance matrix

This paper presents a low loss 8–10GHz tunable filter using high-Q RF MEMS capacitance networks. An improved design method, which utilizes admittance matrix of the filter network, is proposed and discussed. Detail design equations for the tuning elements and coupled microstrip λ/2 resonators are given. Compared to previous method, this method is improved since it is applicable to not only symmetric filter network but also asymmetric ones. To verify this method, an 8–10GHz tunable filter is designed and simulated. The simulation results obtained by 3D electromagnetic simulation tool are in good agreement with the results calculated by the proposed method.