Development of Broadband LHCP Pyramidal Horn Antenna with Septum Gaussian Profile Polarizer for CP-SAR Sensor Onboard Microsatellite

Document pages: 11 pages

Abstract: Horn Antenna has many applications such as communication, radar, andstandard reference antenna for measurement. In this research, we designed apyramidal horn for a Circularly Polarized Synthetic Aperture Radar (CP-SAR)sensor onboard a microsatellite. We utilized a 3D printer with Fused DepositionModelling (FDM) technology for fast, low-cost, and low-weight production.Polylactide (PLA) material was used to construct 3D structures, and acopper conductive coating was painted on its surface. Gaussian distributionfunction was employed to create a septum polarizer profile. NPC-220 A with1.6 thickness and 2.17 dielectric constant was used to make a microstrip monopoleantenna and stripline feeding to feed the pyramidal horn to generateTE01 mode at one side of the waveguide. The design, parametric studies, andmeasurements are discussed in this paper. The designed antenna can achievewide bandwidth 28 of 3 dB axial ratio, and more than 22 of s11 ≤ −10 dBin working frequency that is acceptable for CP-SAR requirement on the microsatellite.