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Microstrip patch back radiation reduction using metamaterial superstrate

Authors :
Ali Soleimani
Amir Jafargholi
Mehdi Veysi
Jun H. Choi
Ali Jafargholi
Source :
IET Microwaves, Antennas & Propagation. 14:158-164
Publication Year :
2019
Publisher :
Institution of Engineering and Technology (IET), 2019.

Abstract

The capability of the capacitively loaded loop (CLL) metamaterial (MTM) superstrate to attenuate surface waves thereby reducing the back radiation of microstrip patch antennas is examined. To understand the surface wave suppression mechanism, theoretical approaches of a grounded dielectric slab waveguide is provided. Both theoretical and numerical analyses show that the proposed superstrate causes a drastic attenuation of surface wave propagation. To confirm the numerical simulations, the proposed antenna is fabricated and tested. The dimensions of the CLL-MTM covered patch antenna are 0.6λ × 0.8λ × 0.14λ. The radiated gain and efficiency are measured at 7.8 dB and 95%, respectively. Measurements show that the front-to-back ratio is enhanced by more than 12 dB. In comparison with the patch antenna without the CLL-MTM superstrate, the proposed antenna reduces the gain and efficiency by less than 0.1 dB and 2%, respectively.

Details

ISSN :
17518733
Volume :
14
Database :
OpenAIRE
Journal :
IET Microwaves, Antennas & Propagation
Accession number :
edsair.doi...........b873ec123b9db2c60d9b432fb9fe7895