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Materials 2013, 6(11), 5058-5068; doi:10.3390/ma6115058

A Near-Zero Refractive Index Meta-Surface Structure for Antenna Performance Improvement

1
Institute of Space Science (ANGKASA), National University Malaysia, Bangi, Selangor 43600, Malaysia
2
Department of Electrical, Electronic and System Engineering, Faculty of Engineering and Built Environment, National University Malaysia, Bangi, Selangor 43600, Malaysia
*
Author to whom correspondence should be addressed.
Received: 28 August 2013 / Revised: 26 October 2013 / Accepted: 1 November 2013 / Published: 6 November 2013
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

A new meta-surface structure (MSS) with a near-zero refractive index (NZRI) is proposed to enhance the performance of a square loop antenna array. The main challenge to improve the antenna performance is increment of the overall antenna volume that is mitigated by assimilating the planar NZRI MSS at the back of the antenna structure. The proposed NZRI MSS-loaded CPW-fed (Co-Planar Waveguide) four-element array antenna is designed on ceramic-bioplastic-ceramic sandwich substrate using high-frequency structure simulator (HFSS), a finite-element-method-based simulation tool. The gain and directivity of the antenna are significantly enhanced by incorporating the NZRI MSS with a 7 × 6 set of elements at the back of the antenna structure. Measurement results show that the maximum gains of the antenna increased from 6.21 dBi to 8.25 dBi, from 6.52 dBi to 9.05 dBi and from 10.54 dBi to 12.15 dBi in the first, second and third bands, respectively. The effect of the slot configuration in the ground plane on the reflection coefficient of the antenna was analyzed and optimized. The overall performance makes the proposed antenna appropriate for UHFFM (Ultra High Frequency Frequency Modulation) telemetry-based space applications as well as mobile satellite, microwave radiometry and radio astronomy applications.
Keywords: near zero refractive index (NZRI); meta-surface structure (MSS); square loop; multi band antenna; performance enhancement near zero refractive index (NZRI); meta-surface structure (MSS); square loop; multi band antenna; performance enhancement
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ullah, M.H.; Islam, M.T.; Faruque, M.R.I. A Near-Zero Refractive Index Meta-Surface Structure for Antenna Performance Improvement. Materials 2013, 6, 5058-5068.

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