Norazah Abdullah, Y. Yamada, K. Kamardin, Ayuni Afiqah Arjunaidi
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Sub-reflector Shaping Method of Spherical Reflector Antenna
Multibeam radiation patterns are requested at satellite antenna communications and 5G mobile communications. The spherical reflector antenna is suitable for multibeam performances. This paper presents the sub-reflector shaping method of a spherical reflector to improve the antenna gain. The sub-reflector is shaped based on the constant path length principle. A spherical reflector antenna with a diameter of 33 at 12.5GHz is selected. The mathematical equations of the shaped sub-reflector's two-dimensional (2D) geometry are investigated in theoretical and simulation. The equation results are validated in FEKO 3D Electromagnetic Simulation. In EM Simulation, the results show that aperture distribution of amplitude and phase are observed with a gain of 38 dBi with 2.03 degrees HPBW.
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