High-gain patch antenna design using PRS and ground plane reflector for THz band applications

•High gain Fabry-Perat-Cavity (FPC) antenna is designed using partial-reflecting surfaces (PRS) techniques.•A small microstrip inset antenna and reflective ground plane is used to feed proposed design.•The 6×6 printed metallic array structure used as PRS structure along with dielectric circular disk to generate the resonance frequency in the air cavity.•The optimum width of PRS and distance from ground plane are able to improve the radiation performance of conventional antenna in the 0.580–0.68 THz frequency band.•The proposed PRS antenna achieved the minimum return loss of −35 dB, peak directivity of 20.7 dBi and radiation efficiency of 88.8% This paper presents the high gain Fabry-Perot-Cavity (FPC) antenna using partial reflected surface (PRS) and reflective ground plane structures for THz band applications. The proposed design employed multi-layered PRS structures placed over the small inset radiating antenna. The first layer of PRS contains single-sided metallic square 6×6 elements, and the second layer design using a simple circular dielectric material. The PRS reflected gain, and cavity height are derived using the ray-tracing method. Interestingly, by combining the feeding antenna and PRS structures, the antenna gain advances from 7.5 dB to 20.2 dB in the operating frequency band from 0.58 to 0.68 THz. Moreover, the projected PRS antenna reveals a 3 dB gain bandwidth of around 14.13%, radiation pattern demonstrates a low side-lobe level and highly directive patterns toward broadside direction. Further, the prototype PRS antenna is designed at 60 GHz to validate the proposed methods that reveal well-matched simulated and measured results of reflection coefficient and gain in the frequency range from 58 to 68 GHz.