| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 106 === A kind of combination of eight-mode resonator and stepped-impedance resonators is proposed in this thesis, and it may also combine an open loop resonator with stepped-impedance resonators as the second proposed circuit. In addition, one can use these combined structures to design quint-band and sext-band bandpass filters, respectively.
For the requirement of multi-band applications, two different structures of multi-band bandpass filter are investigated. Base on the structure of first proposed circuit, one can use an eight-mode resonator to create three bands, and use half-wavelength/quarter-wavelength stepped-impedance resonators to design another two bands. At last, one can combine the eight-mode resonator and stepped-impedance resonators into a quint-band bandpass filter.
Base on the second proposed circuit’s design theory, one can redesign a sext-band bandpass filter by adding four resonator pairs to put in an open loop resonator. Such structure not only increases the freedom of design, but also creates the most bands in a finite circuit size. Eventually, comparisons of experimental and simulated results are presented to verify the theoretical predictions.
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