Gain Improvement of Reflector Antennas Using Novel Partially Reflective Surfaces

This paper presents the antenna gain improvement of conventional reflector antennas using novel partially reflective surfaces (PRS). The conventional circular open-ended feed horn with 20×20×4 cm ³ flat ground plane and the antenna gain of 11.6 dBi at 9.5 GHz is modified to improve the antenna gain. The PRS cross-slot together with the rectangular slot structures are combined and embedded in the rectangular conducting patch unit cells to increase the antenna gain. Moreover, the conventional center-fed parabolic reflector antenna size of 20×20×18.2 cm ³ with 23.8 dBi gain is employed as the reference antenna. It is found that the proposed antenna length (20×20×5.65 cm ³ ) is shorter than the conventional center-fed parabolic reflector antenna by 3.64 times while an improved antenna gain of 25 dBi is achieved. Moreover, in the case of a conventional circular open-ended feed horn with a flat ground plane, the antenna gain is increased from 11.6 dBi to 25 dBi.