Vol. 70

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2017-09-22

Miniature Triple-Mode Diplexer with Good Selectivity

By Sugchai Tantiviwat, Mohammad Shahrazel Razalli, and Siti Zuraidah Binti Ibrahim
Progress In Electromagnetics Research Letters, Vol. 70, 75-80, 2017
doi:10.2528/PIERL17071503

Abstract

This paper presents a compact diplexer with high selectivity. The proposed diplexer employs two sets of triple-mode bandpass lters. 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 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 0.30λg x 0.35λg. The measured results are in good agreement with the simulated predictions.

Citation


Sugchai Tantiviwat, Mohammad Shahrazel Razalli, and Siti Zuraidah Binti Ibrahim, "Miniature Triple-Mode Diplexer with Good Selectivity," Progress In Electromagnetics Research Letters, Vol. 70, 75-80, 2017.
doi:10.2528/PIERL17071503
http://www.jpier.org/PIERL/pier.php?paper=17071503

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