Nouvelles architectures d’antennes à éléments parasites pour la polarisation circulaire : Application à la conception d’une antenne en bande X pour nanosatellite

摘要

The investigations presented in this thesis propose the synthesis of circularly polarized antennas with parasitic elements. An innovative and effective strategy is developed and implemented to synthesize a multi-objective radiation patterns. Parasitic elements can also be associated with other antennas to improve the performances. Two antennas were suggested. The first one represents a wide band circularly polarized directive antenna with parasitic elements. This demonstrator consists of the combination of 18 parasitic dipoles with a logarithmic spiral antenna; this antenna was manufactured and measured. The second antenna is a part of a space project « Isoflux X-Band antenna for Nano-Satellite». This compact antenna has been developed to support transmission rates for future mission.