Title :
Miniature microstrip stepped impedance resonator bandpass filters and diplexers for mobile communications
Author :
Sheta, A.F. ; Coupez, J.P. ; Tanne, G. ; Toutain, S. ; Blot, J.P.
Author_Institution :
France-Telecom, CNRS, Brest, France
Abstract :
Miniature microstrip stepped impedance resonator bandpass filters and diplexers for satellite mobile communications have been developed. A very high dielectric constant substrate (/spl epsiv//sub r/=89 and h=2 mm) is used. Experimental results show that an unloaded half wave resonator quality factor as high as 400 at 1.5 GHz, with such substrate, may be possible. The merit of this circuit lies in the simplicity of design procedure, the possibility of developing this filter with quite a variety of high dielectric constant substrate materials and the simplicity of simulation with most commercial software packages. A four resonator bandpass filter with 35 MHz bandwidth at 1.55 GHz was designed and implemented with this substrate. Based on this filter, a diplexer which meets satellite mobile communications performance has been developed. Experimental results are in good agreement with theoretical predictions.
Keywords :
Q-factor; band-pass filters; microstrip filters; microstrip resonators; mobile satellite communication; multiplexing equipment; resonator filters; 1.5 GHz; 35 MHz; circuit design; diplexer; high dielectric constant substrate; miniature microstrip stepped impedance resonator bandpass filter; quality factor; satellite mobile communications; simulation; Artificial satellites; Band pass filters; Dielectric substrates; High-K gate dielectrics; Impedance; Microstrip filters; Microstrip resonators; Mobile communication; Q factor; Resonator filters;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.511007
