Title :
A novel reconfigurable bandpass filter using varactor-tuned stepped-impedance-stubs
Author :
Min Ou ; Yuhang He ; Liguo Sun
Author_Institution :
Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei, China
Abstract :
A novel reconfigurable bandpass filter using varactor-tuned stepped impedance resonator (SIR) is introduced to achieve tunable central frequency and bandwidth. The varactor-tuned stepped impedance resonator structure consists of a stepped impedance with open or short-circuited stub and a varactor between the stubs. It´s convenient to change the transmission zeros with the appropriate DC voltage controlling the values of varactor capacitors. In addition, the ratios between the two sections of SIRs can be easily changed to reformulate the resonant frequencies and then more design freedom of filter is obtained. The experimental results validate the design.
Keywords :
band-pass filters; microwave filters; resonator filters; varactors; DC voltage; novel reconfigurable bandpass filter; open-circuited stub; short-circuited stub; transmission zeros; varactor capacitors; varactor-tuned SIR; varactor-tuned stepped impedance resonator; Band-pass filters; Bandwidth; Capacitance; Filtering theory; Microwave filters; Resonator filters; Varactors;
Conference_Titel :
Antennas & Propagation (ISAP), 2013 Proceedings of the International Symposium on
Conference_Location :
Nanjing
Print_ISBN :
978-7-5641-4279-7
