Title :
A method for improving out-of-band characteristics of /spl lambda//2 microstrip line resonator bandpass filters
Author :
Wada, Kouji ; Nakagawa, Kouichi ; Hashimoto, Osamu ; Harada, Hiroshi
Author_Institution :
Coll. of Sci. & Eng., Aoyama Gakuin Univ., Tokyo, Japan
Abstract :
Improvement of out-of-band characteristics for a bandpass filter (BPF) using λ/2 microstrip line (MSL) resonators is carried out. The basic operations of a tapped λ/2 resonator are examined theoretically and experimentally. The application to MSL resonator BPF with improved spurious responses are also examined. An extended 2-pole BPF with improved skirt characteristics and target spurious response is proposed and realized. It is confirmed that the present concept is great useful for improving out-of-band characteristics of the λ/2 resonator BPFs.
Keywords :
UHF filters; band-pass filters; microstrip filters; microstrip resonators; microwave filters; passive filters; resonator filters; /spl lambda//2 microstrip line resonators; bandpass filter; extended two-pole BPF; out-of-band characteristics; skirt characteristics; spurious responses; tapped /spl lambda//2 resonator; Attenuation; Band pass filters; Circuit simulation; Coupling circuits; Dielectric substrates; Electronic mail; Impedance; Microstrip filters; Microstrip resonators; Resonator filters;
Conference_Titel :
Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific
Conference_Location :
Taipei, Taiwan
Print_ISBN :
0-7803-7138-0
DOI :
10.1109/APMC.2001.985454
