CRLH structure-based high-impedance surface for performance enhancement of planar antennas

Karthik T. Chandrasekaran; Muhammad Faeyz Karim; Nasimuddin; Arokiaswami Alphones

CRLH structure-based high-impedance surface for performance enhancement of planar antennas

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Author(s): Karthik T. Chandrasekaran ¹ ; Muhammad Faeyz Karim ² ; Nasimuddin ² ; Arokiaswami Alphones ¹
- Affiliations: 1: Electrical and Electronics Engineering Department, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore ;
  2: IOTC, Institute for Infocomm Research, Singapore, Singapore
Source: Volume 11, Issue 6, 12 May 2017, p. 818 – 826
DOI: 10.1049/iet-map.2016.0629 , Print ISSN 1751-8725, Online ISSN 1751-8733

Received 03/08/2016, Accepted 15/12/2016, Revised 02/12/2016, Published 16/12/2016

A composite right/left-handed (CRLH) structure-based high-impedance surface (HIS) is investigated to improve gain and front-to-back ratio of planar microstrip antennas. An unbalanced CRLH unit cell with a wide band-stop region from 2.0 to 6.44 GHz is modelled and designed for HIS to enhance the antenna performance. A novel via-less structure composed of an interdigital capacitor and four spiral arms is used for the microstrip implementation of the CRLH unit cell. The HIS is formed by the repetition of the unbalanced CRLH unit cells in two-dimensional form. The microstrip patch antennas operating at three different frequencies: 2.34, 3.77 and 5.64 GHz in the band-stop region of the HIS are designed with and without HIS to compare the antenna performances. An increase in gain of 1.91, 2.03 and 0.7 dB and an improvement in the front-to-back ratio of 4.9, 6.0 and 4.2 dB are achieved for the patch antennas operating at 2.34, 3.77 and 5.64 GHz, respectively. To demonstrate the effectiveness of HIS, a patch antenna over HIS is fabricated and measured results show good correlation with the simulated results. An overall antenna size at 2.26 GHz is 0.378λ _o × 0.303λ _o × 0.012λ _o.

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CRLH structure-based high-impedance surface for performance enhancement of planar antennas

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