Horn Antenna has many applications such as communication, radar, and
standard reference antenna for measurement. In this research, we designed a
pyramidal horn for a Circularly Polarized Synthetic Aperture Radar (CP-SAR)
sensor onboard a microsatellite. We utilized a 3D printer with Fused Deposition
Modelling (FDM) technology for fast, low-cost, and low-weight production.
Polylactide (PLA) material was used to construct 3D structures, and a
copper conductive coating was painted on its surface. Gaussian distribution
function was employed to create a septum polarizer profile. NPC-220 A with
1.6 thickness and 2.17 dielectric constant was used to make a microstrip monopole
antenna and stripline feeding to feed the pyramidal horn to generate
TE01 mode at one side of the waveguide. The design, parametric studies, and
measurements are discussed in this paper. The designed antenna can achieve
wide bandwidth 28% of 3 dB axial ratio, and more than 22% of s11 ≤ −10 dB
in working frequency that is acceptable for CP-SAR requirement on the microsatellite.
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