Circular Polarization Wide-Angle Beam Steering at Ka-Band by In-Plane Translation of a Plate Lens Antenna

PROJECT TITLE :

Circular Polarization Wide-Angle Beam Steering at Ka-Band by In-Plane Translation of a Plate Lens Antenna

ABSTRACT:

A easy mechanical beam steering antenna concept is proposed for ground mobile terminals of Ka-band satellite and high altitude platform (HAP) providing broadband access services. The wide-angle elevation beam steering is achieved by in-plane translation of a skinny offset flat lens in front of a stationary primary feed whereas full azimuth coverage is obtained by simple 360° rotation of the lens. A new strategy is also proposed to reduce the effective F/D of the focusing system and consequently the overall antenna height while not increasing beam distortion: a second small flat lens is added on prime of the primary feed to form a virtual focus located well below the feed section center. The challenge is to conciliate high gain both with wide beam scanning and reduced antenna height. Design rules are presented for this antenna concept together with a 27.three-dBi gain fabricated example for the up-link Ka-band (twenty nine.5–30 GHz), with circular polarization, zero° to fifty° elevation scan, higher than two.8-dB scan loss and an efficient F/D of only zero.55. Both lenses are 3.thirty five-mm thick, shaped by a appropriate assembly of phase shifting unit cells with less than zero.4 dB of transmission loss in simulation. The most lens dimensions are $195;textmm times 145;textmm$ and its weight is 215 g. Total antenna height, together with the feed is 84 mm.

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