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Improving Directional Properties of Circularly Polarized Dish Parabolic Antennas through Knife-Edge Metallic Scatters |
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PP: 1013-1018 |
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doi:10.18576/amis/170608
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Author(s) |
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Ali Houssein Harmouch,
Ali Elrashidi,
Farah Shakra,
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Abstract |
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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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