Open AccessAMC surface based on spiral strips and its applications for low‐profile broadband planar antennas
Author(s) -
Li RongLin,
Qin Yue,
Li Fuyun,
Wu Linjuan,
Cui Yuehui
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5489
Subject(s) - optics , strips , dipole antenna , bandwidth (computing) , planar , materials science , conductor , monopole antenna , physics , optoelectronics , electrical engineering , antenna (radio) , telecommunications , engineering , computer science , computer graphics (images) , composite material
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 .