Axial Displaced Ellipse Reflector Antenna with Adjustable Beamwidth for E-band Wireless Link

This paper presents the design of an E-band high-gain Axial Displaced Ellipse (ADE) reflector antenna. The compact antenna has the ability to adjust the beamwidth. Simulated results show that by moving the sub reflector away from the feed, half-power beamwidth (HPBW) can be expanded at least 5 times from 71GHz to 86GHz. When the beamwidth is the narrowest, on-axis directivity of 46.1±0.8dBi between 71-86GHz is obtained.

I. Introduction

With the development of airborne platform, high-resolution images and other sensor data need to be transmitted to the fixed ground station. However, through the channel data rates of the conventional frequency band, it is no longer able to meet the wireless transmission rates of more than 10Gbps. The E-band (71–76/81-86GHz) permitted worldwide can provide 2×5GHz available band-width for ultra-high capacity communications [1]. Besides, E-band is in the atmospheric window, and its atmospheric loss is only 0.4dB/km. E-band is very suitable for establishing high-speed air-to-ground and air-to-air wireless links [2].