Design and Simulation of a Compact Axial and Radial Corrugated Horn Antenna for Ku-Band Defense and Aerospace Applications

This paper presents the design and simulation of a compact axial and radial corrugated horn antenna for Ku-Band defense and aerospace applications. The antenna employs a combination of axial and radial corrugations to achieve efficient mode conversion into the hybrid HE11mode, resulting in improved beam quality with low cross-polarization and reduced sidelobe levels. An axially corrugated profile shortens the horn length while maintaining high gain and radiation efficiency, making it suitable for defense and aerospace systems where size and performance are critical. The antenna was designed and analyzed using CST Microwave Studio. Simulation results show that the antenna achieves gain above 20 dBi with low sidelobe levels across the Ku-Band, demonstrating its potential for next-generation defense and aerospace platforms.