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Aperture-Backed Microstrip-Line Stepped-Impedance Resonators and Transformers for Performance-Enhanced Bandpass Filters
Hang WANG Lei ZHU
Publication
IEICE TRANSACTIONS on Electronics
Vol.E89-C
No.3
pp.403-409 Publication Date: 2006/03/01 Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.3.403 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Microwaves, Millimeter-Waves Keyword: microstrip bandpass filter, backside aperture, harmonic suppression, impedance transformer, stepped impedance resonators,
Full Text: PDF(871.8KB)>>
Summary:
A novel class of microstrip bandpass filter is configured using the impedance transformers and an improved stepped impedance resonator (SIR). This SIR is composed of a central narrow strip section with an aperture on ground and two wide strip sections at the two sides. This low-high-low SIR resonator has a promising capability in achieving an extremely large ratio of first two resonant frequencies for design of a bandpass filter with ultra-broad stopband. The two quarter-wavelength transformers with low and high impedances, referred as to impedance- and admittance-inverters, are modeled and utilized as alternative types of inductive and capacitive coupling elements with highly tightened degrees for wideband filter design. After extensive investigation is made on the two transformers and the proposed SIR, the two novel bandpass filters are constructed, designed and implemented. Two sets of predicted and measured frequency responses over a wide frequency range both quantitatively exhibit their several attractive features, such as ultra-broad stopband with deep rejection and broadened dominant passband with low insertion loss.
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