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- Title
Miniaturised artificial magnetic conductor and its application in unidirectional circularly polarised slot antenna design.
- Authors
Jianxing Li; Huimin Huo; Juan Chen; Shitao Zhu; Hongyu Shi; Anxue Zhang
- Abstract
A polarisation independent artificial magnetic conductor (AMC) miniaturised using interdigital capacitors is investigated. Its performance is analysed and compared with two other previously reported AMCs. Then, a circularly polarised square slot antenna (CPSSA) utilising the proposed AMC as a reflector is implemented, which achieves unidirectional radiation and low profile simultaneously. The CPSSA is fed by a coplanar waveguide and loaded by two L-shaped strips placed around two diagonal corners, providing the required perturbation for circular polarisation radiation. In between the slot antenna and the AMC reflector is an air gap layer. The performance comparison of the whole antenna system employing different reflectors (three AMCs and one perfect electric conductor (PEC)) proves the advantage of the proposed AMC. As for the fabricated antenna prototype, the measured 10 dB return loss impedance bandwidth and 3 dB axial ratio bandwidth are 15.9 and 4.1%, respectively, corresponding to the centre frequency of 2.71 GHz. In addition, an almost constant gain of around 5.5 dBic has been obtained across the circular polarisation bandwidth within an overall antenna volume of 0.54λ0×0.54λ0×0.08λ0.
- Subjects
CAPACITORS; COPLANAR waveguides; GLOBAL Positioning System; WIRELESS LANs; RADIO frequency identification systems
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2018, Vol 12, Issue 12, p1885
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2018.0108