Abstract:
Metasurface gives you unprecedented control over the polarization, phase, and amplitude of
electromagnetic (EM) waves. Because of its vital significance in diverse fields such as polarization
conversion, antennas, satellite communication, radar cross section (RCS) reduction, microwave
and optical communication and polarization manipulation property, metasurfaces has piqued the
attention of researchers. Chiral metasurfaces are a type of metasurface in which the mirror copy of
a structure cannot be overlaid on top of itself. Chirality in metasurfaces results in exceptional EM
features such as polarization conversion and asymmetric transmission.
Two separate designs for circular polarization converter chiral metasurfaces are presented in this
thesis. By incorporating chirality into the structures, a reciprocal bi-layered metasurface can be
created. The proposed designs are made of unique configurations of resonator structures (T, U and
wires) on the top and bottom layers of the metasurface. To create chirality in the design, the
identical structure is printed on the bottom layer as the top layer and then is rotated at a 90° angle.
The suggested metasurface of design 1 can achieve asymmetric circular polarization conversion
for x-polarization at lower frequencies of 5.52-5.59 GHz, 7.78-7.81GHz and 8.31-8.36GHz (C and
X band). In the same way, design 2 is operating in K frequency band of range (18.5-18.9GHz and
22.9-23.2GHz.), for y-polarized incident wave. Furthermore, the response of these designs is
unaffected by oblique incidences up to 45 degrees and thirty degrees for both design 1 and 2,
respectively. The proposed metasurfaces are viable contenders for polarization conversion
applications due to their simple designs, angular stability, lower frequency working bands, and
minimized profile
