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Mu-near-zero metasurface for microstrip-fed slot antennas

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Abstract

A mu-near-zero metasurface as a superstrate consisting of a periodically square closed ring is proposed for gain and bandwidth enhancement of microstrip-fed slot antennas (MFSAs). The metasurface exhibits near-zero permeability (0<μ<1) and negative reflection phase. For a unidirectional radiation pattern, the metasurface above the MFSA is employed to reduce the back-lobe radiation (180∘) and enhance the gain at 0∘ without a metallic reflector. Interestingly, if additional metasurfaces are placed on both sides of the MFSA, a low-profile, high-gain and wide-band bidirectional antenna can be obtained. The results indicate that the metasurface can also enhance the radiation characteristics, impedance bandwidth and efficiency. Both simulation and measurement of the proposed antennas with metasurface show a fractional bandwidth of 25 % and the overall thicknesses of λ 0/12 and λ 0/6 of uni- and bidirectional antennas, respectively.

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Acknowledgements

This work has been supported by King Mongkut’s University of Technology under the grant contract number KMUTNB-GEN-54-20.

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Authors and Affiliations

  1. Wireless Communication Research Group (WCRG), Electrical and Computer Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand

    Sarawuth Chaimool & Prayoot Akkaraekthalin

  2. Department of Electronic and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Bangkok, Thailand

    Chawalit Rakluea

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  1. Sarawuth Chaimool
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  2. Chawalit Rakluea
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  3. Prayoot Akkaraekthalin
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Correspondence to Sarawuth Chaimool.

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Chaimool, S., Rakluea, C. & Akkaraekthalin, P. Mu-near-zero metasurface for microstrip-fed slot antennas. Appl. Phys. A 112, 669–675 (2013). https://doi.org/10.1007/s00339-013-7703-6

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  • DOI: https://doi.org/10.1007/s00339-013-7703-6

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