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Microstrip Lowpass Filters with Reduced Size and Improved Stopband Characteristics
Zhewang MA Kaneo NOMIYAMA Yoshio KOBAYASHI
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/01/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
lowpass filters, microstrip lines, open stubs, stepped-impedance, transmission zeros,
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Novel microstrip lowpass filters are developed with reduced size and significantly improved stopband characteristics. After introducing quarter-wavelength open stubs, we get one or two transmission zeros in the stopband. By folding the high impedance microstrip lines, we reduce the size of the filter. Three-pole and five-pole lowpass filters are designed, and their measured frequency responses agree well with theoretical predictions.