Title :
A Novel Miniaturised High Dielectric Constant Microstrip Hairpin Bandpass Filter Using Large-Ratio Impedance Steps for Improved Stopband Performance
Author :
Crute, John R. ; Davis, Lionel E.
Author_Institution :
Department of Electrical Engineering and Electronics, UMIST, P.O. Box 88, Manchester, M60 1QD, UK. Email: jcrute@iee.org.uk
Abstract :
A compact hairpin stepped-impedance resonator structure is proposed using large-ratio impedance steps to increase the first harmonic resonance frequency. The new resonator is used to design a novel microstrip bandpass filter by a simple and accurate CAD technique, using a commercial electromagnetic field solver. A high degree of miniaturisation is achieved by fabricating the filter on a BaO-PbO-Nd2O3-TiO2 ceramic substrate, with a dielectric constant of 90.9. Measurements on a filter at 1.8 GHz show close agreement with simulations and demonstrate a significant improvement in stopband performance. The centre frequency of the first harmonic passband is increased to approximately 4.3 GHz.
Keywords :
Band pass filters; Design automation; High-K gate dielectrics; Impedance; Microstrip filters; Microstrip resonators; Power harmonic filters; Resonance; Resonant frequency; Resonator filters;
Conference_Titel :
Microwave Conference, 2000. 30th European
Conference_Location :
Paris, France
DOI :
10.1109/EUMA.2000.338627
