Self-Supporting Circularly Polarized Backfire Helix Feed Antenna with Reflector and Director for Deep Dish Reflector Antennas in the L-Band

Backfire helix antennas are particularly interesting candidates for use as feeds of reflector antennas due to their natural circular polarization, lightweight construction, and minimal blockage. An additional reflector element can provide further degrees of freedom to optimize the illumination efficiency, reduce the backlobe and increase cross-polarization isolation. The result is an efficient, lightweight and versatile feed antenna, particularly well-suited for deep dish reflector antenna applications in the L-band.