Metamaterial Fabry-Perot cavity implementation for gain and bandwidth enhancement of THz dipole antenna

In this article, Metamaterial layer is implemented to improve radiation characteristic of dipole antenna at THz domain. Also, cavity back reflector is studied in order to gain enhancement and pattern shaping; in fact, combination of both structures is known as Fabry-Perot cavity. Return loss is modified at 486-654 GHz for less than -10 dB and also Q factor is calculated in presence of Metamaterial layer. The absorption and shield factors are simulated and showed at 0.55 THz. Antenna gain is increased more than 120% and bandwidth is amended around 82%. By achieved simulation result, -14.85 dB shield factor is obtained for proposed metamaterial layer. The dipole antenna contains silver line on silicon lossless material with n =2.43 and the plasmonic layer is modeled by deposition of silver wire in silicon. In addition, Glass (n =1.65) and SiN (n =1.87) are used for metamaterial part and it is shown that increase in the permittivity leads to decrease the plasmonic permittivity; thus, more bandwidth of the structure is obtained. Also, effect of change in radius of the metamaterial micro wire on bandwidth of the antenna is considered. (C) 2016 Elsevier GmbH. All rights reserved.