Title :
Frequency transform synthesis method for cross-coupled resonator bandpass filters
Author :
Wang, Xiyuan ; Di, Yingjie ; Gardner, Peter ; Ghafouri-Shiraz, H.
Author_Institution :
Dept. of Electron., Peking Univ., Beijing, China
Abstract :
In this letter, an improved synthesis method for equal-ripple cross-coupled resonator bandpass filter is proposed based on the frequency transform method and Atia´s method. In this method, the conventional lowpass prototype method is revised by replacing the low pass prototype with the frequency transform method. The detailed element extraction procedure in z-domain is given. Also the coupling matrix reduction implemented by optimization algorithm is described. This method is powerful for filter synthesis with asymmetric frequency response and complex transmission zeros. The design examples are presented and the experimental results validate its effectiveness.
Keywords :
band-pass filters; frequency response; frequency-domain analysis; frequency-domain synthesis; optimisation; resonator filters; Atia method; asymmetric frequency response; bandpass filter synthesis; bandpass filters; complex transmission zeros; coupling matrix reduction; cross-coupled resonator; element extraction; frequency transform method; lowpass prototype method; Band pass filters; Circuit synthesis; Coupling circuits; Filtering theory; Frequency response; Frequency synthesizers; Passband; Power engineering and energy; Prototypes; Resonator filters; Bandpass filter synthesis; cross-coupled resonator; frequency transform method;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.852799
