Broadband single-layer reflectarray antenna for X-band applications

BODUR H. , Unaldi S., ÇİMEN S. , ÇAKIR G.

IET MICROWAVES ANTENNAS & PROPAGATION, vol.12, no.10, pp.1609-1612, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 10
  • Publication Date: 2018
  • Doi Number: 10.1049/iet-map.2017.0270
  • Page Numbers: pp.1609-1612
  • Keywords: broadband antennas, reflectarray antennas, microwave antenna arrays, antenna radiation patterns, antenna feeds, electromagnetic wave polarisation, broadband single-layer reflectarray antenna, X-band applications, X-band unit cell structure, circular ring, complementary diagonal patch ring, thin dielectric substrate, phasing range, slow phase variation, wide phase variation, centre-fed broadband reflectarray antenna, aperture efficiency, antenna efficiency, gain bandwidth, minimum cross-polarisation discrimination, frequency 8 GHz to 12 GHz, gain 21, 6 dB, gain 1 dB, gain 3 dB, VARIABLE-SIZE, PRINTED REFLECTARRAYS, MICROSTRIP PATCHES, CROSS-POLARIZATION, ARRAY ANTENNA, DELAY, EFFICIENCY, ELEMENTS


A new type of X-band (8-12GHz) unit cell structure on a single-layer for broadband reflectarray antennas is presented in this study. To obtain a broadband performance, a unit cell composed of a circular ring and a complementary diagonal patch ring is proposed. This new type unit cell is designed on a 0.183x(0) (air-dielectric) thin dielectric substrate and has a 430(degrees) phasing range with slow phase variation. Based on the wide phase variation of the proposed unit cell, a centre-fed broadband reflectarray antenna is designed with 9x9 unit cells, 81 elements on a square plane geometry. The designed reflectarray has 40% aperture efficiency and 96% antenna efficiency at 10.5GHz. The validity of the reflectarray antenna is verified through measurement and simulation results. The experimental and simulation results are in good harmony. The measured and simulated results show that the maximum gain of the reflectarray antenna is 21.6dBi at 10.5GHz and has 23% 1dB gain bandwidth and 29% 3-dB gain bandwidth. Also, the minimum cross-polarisation discrimination is 31.2dB at 11GHz frequency.