Metallic S-Band Antenna for Satellite TT&C Links

This letter presents a spherical helix antenna. Its specific shape allows broadband operation within the usual satellite
S
-band telemetry, tracking, and control frequency bands (
$2.025\!-\!2.29$
GHz). The antenna radiates right-handed polarization over a wide beamwidth. Axial ratio is better than 6 dB until roughly
$80^{\circ }$
elevation. Almost all external parts are composed of metal, which makes this antenna well-suited for harsh space environment such as geostationary orbit or deep-space missions. Overall dimensions are
$\text{94}\times \text{94}\times \text{48}$
mm
$^3$
(with connector).