Title :
A hybrid method for flat-passband filter with nonuniform Q resonators and predistortion
Author :
Liang-Feng Qiu ; Lin-Sheng Wu ; Wen-Yan Yin
Author_Institution :
Key Lab. of Minist. of Educ. of Design & EMC of High-Speed Electron. Syst., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
A new synthesis method is proposed for the design of high-performance parallel connected lossy filters. Compared with the nonuniform Q method, where the Q distribution is determined by the sensitivities of a preset coupling matrix, our method can provide a flat passband with flexible combination of nonuniform Q resonators by utilizing the predistortion technique with an adaptive offset. Two generalized Chebyshev filters with different specific Q-factors are designed with the negative and positive distortion offsets. The proposed hybrid method has been validated by the perfect passband flatness achieved with both of them.
Keywords :
Chebyshev filters; Q-factor; band-pass filters; matrix algebra; resonator filters; Chebyshev filters; Q distribution; Q-factors; adaptive offset; flat passband; flat-passband filter; hybrid method; negative distortion offsets; nonuniform Q method; nonuniform Q resonators; parallel connected lossy filters; positive distortion offsets; predistortion technique; preset coupling matrix; synthesis method; Band-pass filters; Couplings; Microwave filters; Passband; Predistortion; Q-factor; Resonator filters; Flat passband; lossy filter; nonuniform Q resonators; predistortion;
Conference_Titel :
Wireless Symposium (IWS), 2014 IEEE International
Conference_Location :
X´ian
DOI :
10.1109/IEEE-IWS.2014.6864212
