Study on the Effect of Different Feeding Structures on the Performance of Graphene Strips Reconfigurable LWA

This paper introduces a comparative study on the effect of using different feeding structures on the radiation characteristics of graphene strips leaky wave antenna (GS-LWA) at 2 THz. The effect of different plane wave launchers on the radiation characteristics of GS-LWA is investigated. A planar substrate integrated waveguide (SIW) horn antenna is investigated. It provides a peak gain of 18.2 dBi with a bandwidth of 21.95% and a SLL of 10.6 dB. End-fire radiation from parabolic reflector is employed to launch plane-wave in the GS-LWA. A matching BW of 0.82 THz is achieved with peak gain of 18 dBi. A coplanar fed Yagi-Uda like structure element is studied using a single element and two elements array. The two elements provided the highest matching of -40 dB over BW of 6% and gain of 16.5 dBi. Finally, tapered microstrip line is investigated, it introduces the lowest SLL − 16.1 dB with a gain of 17.5 dBi and BW of 39.57% (1.5–2.24 THz). The selection of proper feeding structure depends on the matching BW, peak radiated gain, and the lowest SLL. A full analysis of the GS-LWA from different feeding methods is presented.