Applied Mathematics & Information Sciences

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Circularly polarized dish parabolic antennas are highly valuable due to their superior resistance to external noise compared to linearly polarized antennas. Dish parabolic antennas equipped with end-fire helical feeds offer circular polarization, high directivity, and relatively low levels of side lobes. However, the presence of a conducting ground plane in the helical feed obstructs the reflected rays from the dish, resulting in a detrimental impact on the antenna’s directional characteristics. This research focuses on optimizing the ground plane through a series of FEKO simulations, leading to a significant reduction of side lobes and an overall enhancement of the antenna’s performance. Moreover, the introduction of knife – edge metallic scatters at specific positions and dimensions in the antenna configuration effectively decreases the sidelobe level within a range of 8 to 12 dB.

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