Abstract:
Metasurfaces have found in recent years several different applications like lensing, holograms in real
time, increasing the gain of antennas, beam splitting, reducing the cross section of radar, polarization
conversion. Polarization manipulation has always been important to scientific and engineering
community due to its diverse applications. Many techniques have been employed to attain
polarization control through conventional methods, but they require bulky size and have narrow
bandwidths. To avoid these difficulties scholars tend to use metasurfaces. In this thesis a novel chiral
metasurface has been designed for multiple operations at microwave frequencies, like asymmetric
transmission and optical activity in transmission mode. The chiral metasurface has ability to obtain
linear cross polarization conversion of incident electromagnetic wave in transmission mode within
the bands of 4.47 GHz to 5.34 GHz and from 16.22 GHz to 16.88 GHz. The chiral metasurface is
formed by an “h” shaped air groves drilled in the copper film on both sides of the dielectric layer,
which exhibit dual band asymmetric transmission with cross polarization conversion with high
efficiency accompanied with optical activity. The proposed chiral structure is useful in
communication network like devices and non-reciprocal electromagnetic devices which make it
strong applicant for applications in C and Ku bands of microwave regimes.
