Metasurface Instrumented High Gain and Low RCS X-Band Circularly
Polarized MIMO Antenna for IoT Over Satellite Application
Abstract
In this article, an X-band metasurface is designed and this metasurface
array is used as an instrument to increase gain & reduce radar cross
section of circularly polarized X-band MIMO antenna through super-state
and under-state positioning of array respectively. Absorbance of the
metasurface to the intended frequency band (i.e., 6.75GHz-14.0GHz) is
more than 90.0%. Metasurface is designed on FR-4 substrate height
(Hs) 3.1mm with unit cell dimension of
7.95×7.95×3.1mm3
(0.265λo×0.265λo×0.103λo)
at 10GHz. The proposed antenna is also designed on FR-4 substrate with
dimensions of 29×23×1.6mm3
(0.966λo×0.766λo×0.0.053λo)
at 10GHz. The super-state and under-state positioning of metasurface
array over MIMO antenna is increased the gain (peak gain 12.6dBi at
11GHz) and reduced the mono-static RCS (18dBm2) across
the band respectively. The characteristic of the antenna is likewise
verified by its s-parameters, radiating efficiency, gain and diversity
parameters for the intended band. The simulated & measured results are
having better harmony which exhibits suitability of the proposed designs
for IoT over satellite, military application, and also useful to
identify blood clouting in CT-scan application.