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In this manuscript a design of silicon on insulator (SOI)‐based dielectric (silicon nitride) Optical Leaky Wave Antenna loaded with periodic circular and diamond shape semiconductor (Si) perturbation is proposed. This optical antenna is excited at one end of dielectric waveguide. The proposed design is also compared with the existing design and the results are obtained which shows that proposed design is more efficient than the existing one. The design results in form of transmission coefficient and reflection coefficient are compared. The efficiency is increased by introducing circular and diamond shape perturbation in the waveguide. The designed Optical Leaky Wave Antenna will be applicable in optical switching and optical imaging.

In this manuscript microstrip patch antenna loaded with multilayer liquid metamaterial radome (superstrate) structures for gain enhancement is presented. The antenna superstrate is loaded with three ring split ring resonator (SRR) metamaterial. Two multilayer radome structures used for enhancement of gain and protection of conventional microstrip patch antenna. First multilayer structure is made with six equal layers of three ring SRR and second multilayer structure is made with four log periodic layers of three ring SRR. The microstrip patch antenna loaded with multilayer SRR radome structure is compared with conventional microstrip patch antenna. The results of proposed design are compared in form of reflection coefficient, gain and bandwidth. The enhancement in gain is achieved by covering antenna with different radome structures.

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