AMC surface based on spiral strips and its applications for low‐profile broadband planar antennas. Issue 3 (28th January 2019)

• Record Type: Journal Article
• Authors: Li, RongLin; Qin, Yue; Li, Fuyun; Wu, Linjuan; Cui, Yuehui
• Is Part Of: IET microwaves, antennas & propagation. Volume 13:Issue 3(2019)
• Page Start: 326
• Page End: 333
• Publication Date: 2019-01-28
• Subjects: planar antennas -- broadband antennas -- UHF antennas -- dipole antennas -- frequency selective surfaces -- microwave antennas -- electromagnetic metamaterials -- metamaterial antennas; AMC surface -- AMC cell -- planar dipole antennas -- linearly polarised antenna -- dual‐polarised antenna -- circularly polarised antenna -- broadband planar antennas -- artificial magnetic conductor surface -- frequency 0.68 GHz to 1.02 GHz -- frequency 0.69 GHz to 0.96 GHz -- frequency 0.75 GHz to 1.05 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2018.5489
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A novel artificial magnetic conductor (AMC) surface based on spiral strips is proposed, which consists of 9 × 9 AMC cells. Each AMC cell includes a spiral strip to increase its inductance, thus featuring a wide bandwidth of 42% for ±90° reflection phase. The AMC surface is applied to three planar dipole antennas for lowering the antenna heights, including a linearly polarised (LP) antenna, a dual‐polarised (DP) antenna, and a circularly polarised (CP) antenna. It is shown by simulation and experiment that the LP antenna achieves an impedance bandwidth of 40% (0.68–1.02 GHz) for | S 11 | < −15 dB and a gain of 8 dBi, the DP antenna realises an impedance bandwidth of 33% (0.69–0.96 GHz) for | S 11 | < −15 dB, an isolation of 30 dB, and a gain of 8 dBi, and the CP antenna has an overlapped bandwidth of 33% (0.75–1.05 GHz) for | S 11 | < −15 dB and axial ratio <3 dB. The heights of all the three planar antennas are lowered from 0.265–0.3 λ 0 to 0.083 λ 0 .