MINIATURE TRIPLE-MODE DIPLEXER WITH GOOD SELECTIVITY

Sugchai Tantiviwat, Mohammad Shahrazel Razalli, Siti Zuraidah Binti Ibrahim
2017 Progress In Electromagnetics Research Letters  
This paper presents a compact diplexer with high selectivity. The proposed diplexer employs two sets of triple-mode bandpass filters. Using this approach, the pair of even-mode resonant frequencies can be flexibly controlled by adjusting the characteristic impedance or electrical lengths of the two open-circuited stubs while the odd-mode resonant frequency remains at the fundamental resonant frequency. For a demonstration, a diplexer with two passbands centred at 1.50 and 1.70 GHz and the
more » ... 0 GHz and the transmission zeros are created close to the passband edges which extremely improve the skirt selectivity. As a result, the proposed diplexer occupies an extremely small area, i.e., approximately 0.30λ g × 0.35λ g . The measured results are in good agreement with the simulated predictions.
doi:10.2528/pierl17071503 fatcat:7y243bcowfekvklspco656rk6y