Low‐profile wideband circularly polarised single‐layer metasurface antenna. Issue 24 (1st November 2018)

• Record Type: Journal Article
• Authors: Liang, Zhipeng; Ouyang, Jun; Yang, Feng
• Is Part Of: Electronics letters. Volume 54:Issue 24(2018)
• Page Start: 1362
• Page End: 1364
• Publication Date: 2018-11-01
• Subjects: broadband antennas -- electromagnetic wave polarisation -- antenna radiation patterns -- antenna feeds -- slot antennas -- microwave antennas; circularly polarised fields -- circularly polarised single‐layer metasurface antenna -- low‐profile wideband metasurface antenna -- axial ratio bandwidth -- low‐profile single‐fed metasurface antenna -- unit cells -- modified L‐type slot -- impedance bandwidth -- dielectric‐filled antenna -- frequency 5.7 GHz -- noise figure ‐10.0 dB -- bandwidth 5.35 GHz to 6.08 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2018.6790
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A novel low‐profile single‐fed circularly polarised single‐layer metasurface antenna for wideband operation is proposed in this Letter. The metasurface antenna consists of nine unit cells arranged in a 3 × 3 layout. Four slits are incorporated into four of them, respectively, to form two orthogonal currents with 90° phase difference; hence, circularly polarised fields are excited. Moreover, a modified L‐type slot is etched on the middle lattice to improve impedance bandwidth and axial ratio performance. The proposed dielectric‐filled ( ɛ r = 3.5, tan δ = 0.001) antenna with a low profile of 0.038 λ 0 ( λ 0 is the working wavelength at 5.7 GHz in free space) achieves about 18.0% measured −10 dB impedance bandwidth. The measured 3‐dB axial ratio bandwidth of the proposed antenna is about 12.8% (5.35–6.08 GHz) with a broadside gain of more than 6.9 dBi.