Title :
Harmonic suppressed microstrip multistage coupled ring bandpass filters
Author :
Marti, J. ; Griol, A.
Author_Institution :
ETSI Telecomunicacion, Univ. Politecnica de Valencia, Spain
fDate :
10/29/1998 12:00:00 AM
Abstract :
Microstrip multistage coupled ring resonator bandpass filters using stepped impedance lowpass filters to suppress higher harmonics have been investigated. Two topologies based on placing the lowpass filters either into or out of the coupled rings have been considered. A harmonic suppression ratio of >32 dB in a flat bandpass filter centred at 2.44 GHz is obtained. A practical implementation has shown very good filter characteristics with a very flat bandpass, insertion loss <1.5 dB, return loss <15 dB and harmonic suppression ratio of >32 dB
Keywords :
band-pass filters; harmonics suppression; low-pass filters; microstrip filters; 1.5 dB; 15 dB; 2.44 GHz; circuit topology; harmonic suppression; insertion loss; microstrip multistage coupled ring bandpass filter; return loss; stepped impedance lowpass filter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19981506
