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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2017-01-21
Miniaturization and Bandwidth Enhancement of a CPW-Fed Annular Slot Antenna Using RIS
By
Gopinath Samanta,

    Dr. Gopinath Samanta

    Department of Electronics and Telecommunication Engineering

    Indian Institute of Engineering Science and Technology

    India

    Homepage

Debasis Mitra,

    Dr. Debasis Mitra

    Department of Electronics& Telecommunication Engineering

    Indian Institute of Engineering Science & Technology Shibpur

    India

    Homepage

Sekhar Ranjan Bhadra Chaudhuri

    Professor Sekhar Ranjan Bhadra Chaudhuri

    Department of Electronics & Telecommunication Engineering

    Bengal Engineering & Science University

    India

    Homepage

Progress In Electromagnetics Research Letters, Vol. 65, 109-116, 2017
doi:10.2528/PIERL16112206 | Google Scholar

Abstract
In this paper a CPW-fed annular slot antenna is miniaturized with enhanced impedance bandwidth using a reactive impedance surface (RIS) substrate. Such meta-surface (RIS) is realized by patterning 3×3 array of circular elements over an inexpensive FR-4 substrate which is backed by a circular metallic plane. Due to the compensation of electric and magnetic energy stored by antenna and RIS substrate respectively, the antenna resonance frequency is shifted by 53.6% compared with a simple slot antenna. By the inclusion of such reactive surface, input impedance of the antenna is reduced, and a remarkable improvement in impedance bandwidth from 11.66% to 64.26% is also noticed. Therefore, both miniaturization and bandwidth enhancement are achieved simultaneously with the present loading technique. The directivity of the RIS loaded antenna is increased further by loading a concentric metallic ring over the RIS loaded structure at a height above the RIS plane. The Ring & RIS loaded structure is fabricated for measurement purpose. A good agreement is obtained between the simulated and measured results for both RIS loaded and Ring & RIS loaded configurations. The ring loading over the RIS antenna provides improvement in directivity about 5 dB. The peak gain and bandwidth are measured as -1.03 dBi and 58.62%, respectively.
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Citation
Gopinath Samanta, Debasis Mitra, and Sekhar Ranjan Bhadra Chaudhuri, "Miniaturization and Bandwidth Enhancement of a CPW-Fed Annular Slot Antenna Using RIS," Progress In Electromagnetics Research Letters, Vol. 65, 109-116, 2017.
doi:10.2528/PIERL16112206
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