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Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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MINIATURE TRIPLE-MODE DIPLEXER WITH GOOD SELECTIVITY

By S. Tantiviwat, M. S. Razalli, and S. Z. B. Ibrahim

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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:
S. Tantiviwat, M. S. Razalli, and S. Z. B. Ibrahim, "Miniature Triple-Mode Diplexer with Good Selectivity," Progress In Electromagnetics Research Letters, Vol. 70, 75-80, 2017.
doi:10.2528/PIERL17071503

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