Showing papers on "Fresnel zone antenna published in 1983"
Patent•
IBM1
TL;DR: In this paper, a Fresnel phase plate lens of either the phase reversal plate or sinusoidal phase reversal plates is formed in materials hitherto not available to be used to produce the lens.
Abstract: A Fresnel phase plate lens of either the phase reversal plate or sinusoidal phase reversal plate type is formed in materials hitherto not available to be used to Fresnel phase plate lenses. The material for the desired Fresnel phase plate lens may be chosen for its optimum spectral transmission range. For example, for infrared spectral transmission, silicon and germanium are chosen for the materials to have the Fresnel phase plate lens formed therein. For the visible spectral transmission range various glasses such as crowns, flints, and borosilicates glasses of suitable optical quality are useful. High silica glasses and fused quartz (silicon dioxide) are useful as the lens material for ultraviolet spectral range.
32 citations
TL;DR: In this paper, a beam scanner based on a 1-D Fresnel zone plate consisting of titanium-diffused channel waveguides on LiNbO3 was proposed, which achieved both beam scanning and focusing without a condensing lens.
Abstract: A new type of beam scanner is discussed based on a 1-D Fresnel zone plate consisting of titanium-diffused channel waveguides on LiNbO3. By electrooptically controlling the guided-wave phase, both beam scanning and 1-D focusing are achieved without a condensing lens. It was experimentally confirmed using the scanner with twenty-one Fresnel zones that the beam spot with a diameter of ∼50 μm at half-power level of diffraction pattern is scanned over a distance of ±70 μm in the focal plane with an applied voltage of ±40 V at 633 nm.
21 citations
TL;DR: In this paper, a periodic structure has been investigated and optimised which can be used to cover the struts of reflector antennas in order to reduce the far sidelobes caused by scattering.
Abstract: A periodic structure has been investigated and optimised which can be used to cover the struts of reflector antennas in order to reduce the far sidelobes caused by scattering from the struts.
3 citations
23 May 1983
2 citations
TL;DR: In this paper, the primary focus operation of reflectors designed for optimum performance in a shaped dual-reflector configuration is considered, provided the reflector diameter is, only a small loss in efficiency is suffered in comparison with a paraboloidal antenna.
Abstract: Primary-focus operation of reflectors designed for optimum performance in a shaped dual-reflector configuration is considered. Provided the reflector diameter is , only a small loss in efficiency is suffered in comparison with a paraboloidal antenna.
1 citations
23 May 1983