Phase Quantized Near-Field Focussing Metasurface for 5.8 GHz Wireless Power Transfer

This paper presents the design of near-field focussing reflector metasurface antenna for wireless power transfer applications at 5.8 GHz. The metasurface is designed using an array of
$13\times 13$
, 1-bit phase qunatized crossed dipole type elements with unit cell volume of
$0.49\lambda \times 0.49\lambda \times 0.13\lambda (\lambda$
is corresponding to frequency of 5.8 GHz). The proposed metasurface reflector illuminated by a microstrip patch antenna is capable of focussing the radiation to a single spot. The focus can be varied from
$1.5-3\lambda$
. The far-field results of the antenna show a broadside radiation with gain of 12.3 dBi and 3dB beamwidth of 9.5° and 7.8° in xz and yz-planes, respectively.