Title :
Compact Structure With Three Attenuation Poles for Improving Stopband Characteristics
Author :
Li, Rui ; Kim, Dong Il ; Choi, Chang Mook
Author_Institution :
Dept. of Radio Sci. & Eng., Korea Maritime Univ., Busan
Abstract :
A novel compact structure with three controllable finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-lines and a capacitive load. With this configuration, three finite attenuation poles are available, which can improve the stopband characteristics of low-pass filters (LPFs) or the upper stopband performances of band-pass filters. The research method is based on a transmission-line model for tuning the finite attenuation poles. In order to examine the feasibility of the proposed structure, a new type of LPF with broad stopband and sharp cutoff frequency response is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones
Keywords :
UHF filters; band-pass filters; band-stop filters; frequency response; low-pass filters; poles and zeros; band-pass filters; compact structure; finite attenuation poles; frequency response; improved stopband characteristics; low-pass filters; parallel coupled-lines; transmission-line model; Analytical models; Attenuation; Band pass filters; Circuit optimization; Couplings; Cutoff frequency; Frequency measurement; Low pass filters; Transmission lines; Tuning; Band-pass filter (BPF); capacitive load; finite attenuation pole; low-pass filter (LPF); parallel coupled-line;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.885617
