Abstract:
Metasurface offers extraordinary possibilities to manipulate the polarization, phase and
amplitude of the electromagnetic (EM) waves. The polarization manipulation property of
metasurfaces became a great attraction for many researchers due to its vital importance in
numerous applications such as beam splitting, antennas, sensor systems, radar cross section
(RCS) reduction, contrast imaging, microwave and optical communication. Chiral
metasurfaces, a subclass of metasurfaces, composed of a structure whose mirror image cannot
be superimposed on top of itself. The existence of chirality in metasurfaces leads to outstanding
EM properties like polarization selectivity and asymmetric transmission.
In this thesis, a multi-band circular polarization selective (CPS) metasurface is presented. A
reciprocal bi-layered metasurface is designed by introducing the chirality in the structure. The
top layer of the proposed metasurface consists of circular split-ring resonator with a cross shape
structure inside it. The same structure is printed on the bottom layer of the proposed
metasurface by rotating it at an angle of 90○
to achieve chirality in the structure. The proposed
metasurface is able to add CPS surface capability between 5.18-5.23 GHz for y-polarization.
Similarly, for x-polarization, three CPS operating bands are achieved within the frequency
ranges of 10.64-10.82 GHz, 12.25-12.47 GHz, and 14.42-14.67 GHz. Furthermore, the
response of the metasurface does not vary against oblique incidences up to 45○
. The simple
design, angular stability, multiple operating bands and miniaturized profile make the proposed
metasurface a potential candidate for polarization conversion applications.
