Tunable Substrate Integrated Waveguide Diplexer With High Isolation and Wide Stopband

A tunable multilayer diplexer using substrate integrated waveguide (SIW) technology is proposed in this letter. A multilayer design is chosen to easily control the electric and magnetic coupling through circular slots in order to achieve a wide-stopband response. The proposed diplexer works at two u...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 29; no. 7; pp. 456 - 458
Main Authors Iqbal, Amjad, Tiang, Jun Jiat, Lee, Ching Kwang, Lee, Byung Moo
Format Journal Article
LanguageEnglish
Published IEEE 01.07.2019
Subjects
Bandwidth
Coupling matrix
Couplings
high isolation
Nonhomogeneous media
substrate integrated waveguide (SIW)
Substrates
tunable diplexer
Tuning
Varactors
wide stopband
Wireless communication
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Summary:A tunable multilayer diplexer using substrate integrated waveguide (SIW) technology is proposed in this letter. A multilayer design is chosen to easily control the electric and magnetic coupling through circular slots in order to achieve a wide-stopband response. The proposed diplexer works at two unique frequencies (centered at 10.5 and 13.5 GHz) with high isolation (>42dB) and a wide stopband (up to 21 GHz). A varactor diode is used in the proposed diplexer for tuning. The varactor diode is placed in the structure in such a way that both channels can be tuned independently without affecting one another. The results show the flexibility of the diplexer in achieving desired responses and its suitability for integration with any tunable component. Simulated and measured results obtained are in good agreement.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2019.2916609