High isolation diplexer using novel cascaded quadruplet bandpass filters

A novel microstrip diplexer with high isolation is proposed. The diplexer is comprised of two novel cascaded quadruplet bandpass filters. The cascaded quadruplet section consists of two half-wavelength resonators and two quarter-wavelength resonators, so the circuit won't occupy much space. By...

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Published in2016 IEEE International Conference on Microwave and Millimeter Wave Technology (ICMMT) Vol. 1; pp. 67 - 69
Main Authors Jian-Feng Chen, Fu-Chang Chen, Run-Shuo Li
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2016
Subjects
Band-pass filters
Couplings
Filtering theory
Frequency measurement
Loss measurement
Resonant frequency
Resonator filters
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Summary:A novel microstrip diplexer with high isolation is proposed. The diplexer is comprised of two novel cascaded quadruplet bandpass filters. The cascaded quadruplet section consists of two half-wavelength resonators and two quarter-wavelength resonators, so the circuit won't occupy much space. By introducing multipath coupling, numerous transmission zeros are generated on each side of the passband and high isolation is achieved. Based on the proposed structure, a diplexer with lower and higher channels centered at 2.0 GHz and 2.4 GHz, respectively, is designed and fabricated. The measured isolation between the two channels is larger than 47.3 dB.
DOI:10.1109/ICMMT.2016.7761679