Title :
An improved design method for asymmetric RF MEMS tunable filter utilizing admittance matrix
Author :
Tu, Cheng ; Bao, Jingfu ; Du, Yijia ; Wu, Wenchang
Author_Institution :
Dept. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
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.
Keywords :
circuit tuning; electric admittance; micromechanical devices; microstrip resonators; radiofrequency filters; 3D electromagnetic simulation tool; admittance matrix; asymmetric RF MEMS tunable filter; coupled microstrip resonator; frequency 8 GHz to 10 GHz; high-Q RF MEMS capacitance network; symmetric filter network; tuning element; Admittance; Capacitance; Capacitors; Design methodology; Frequency; Radiofrequency microelectromechanical systems; Resonator filters; Symmetric matrices; Transmission line matrix methods; Tunable circuits and devices; RF-MEMS; admittance matrix; capacitive loading; tunable filter;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-5705-2
DOI :
10.1109/ICMMT.2010.5524840
