Other
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974itap...22..746h&link_type=abstract
IEEE Transactions on Antennas and Propagation, vol. AP-22, Nov. 1974, p. 746-751.
Other
Antenna Radiation Patterns, Beams (Radiation), Circular Polarization, Horn Antennas, Propagation Modes, Satellite Antennas, Antenna Design, Communication Satellites, Earth Surface, Waveguides
Scientific paper
A multimode circularly polarized rectangular horn antenna generating an elliptical shaped beam is described. This antenna operates in two orthogonal mode sets, namely the TE(10) + TE/TM(12) and TE(01) + TE/TM(21) modes. By virtue of the higher order TE/TM modes, the aperture E-field distribution can be tapered such that the effective E-plane far-field beam width is approximately equal to the H-plane beam width of the other orthogonal set of modes, resulting in low off-axis polarization axial ratio. Because of the tapered aperture distribution, the radiation patterns also have low sidelobes. The elliptical cross section beam is a direct result of the rectangular shaped aperture. This antenna, used in conjunction with a spacecraft to illuminate an elliptical zone on the earth surface, offers high edge-of-coverage gain, low sidelobes, low edge-of-coverage (EOC) axial ratio, less RF sensitivity to the space environment, and low cost.
Han Cheongho
Wickert A. N.
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