X-band compact choke horn antenna with circular polarization and isoflux pattern for nanosatellite applications

Abstract

International audienc

X-band compact dual circularly polarized isoflux antenna for nanosatellite applications

“…2) is obtained by the addition of a dual circularly polarized patch feed (DCPPF) placed on the choke horn aperture (grayed area). The patch replaces the radiating aperture achieved by the waveguide of the antenna designed in [1]. Note that the dimensions of this horn have not been changed except the choke height.…”

“…This optimization depends to the amplitude of the feed aperture field at the center. Since this parameter is similar between the patch and the radiating aperture, the optimization made in [1] remains correct. On the other hand, the choke height is not uniform ( h 1 < h 2 = 19.85 mm) to have a realized gain (RG) >0 dB at the LOC whatever the frequency.…”

“…On the other hand, the choke height is not uniform ( h 1 < h 2 = 19.85 mm) to have a realized gain (RG) >0 dB at the LOC whatever the frequency. Notice that one of the aforementioned value is still identical to the design in [1]. The set is inserted into the 3U platform, which is simulated as a perfect electric conductor cube but only with a height of 30 mm to reduce the simulation time.…”

“…Several solutions have been previously designed by our laboratory. A trade-off between isoflux pattern quality and antenna size was made in [1]- [3]. Whatever the design, the circular polarization was limited to a single polarization.…”

“…Planar solutions such as an array of patches [11]- [16] are interesting but they suffer from important dimensions and they require a complex feeding network. The proposed original solution is the association between a patch, used as feed, and a choke horn antenna which is based on [1]. The first one provides the dual circular polarization while the latter allows realizing the isoflux radiation pattern.…”