paraboloidal reflector

paraboloidal reflector

[pə¦rab·ə¦lȯid·əl ri′flek·tər]
(electromagnetism)
An antenna having a concave surface which is a paraboloid of revolution; it concentrates radiation from a source at its focal point into a beam. Also known as paraboloidal antenna.
(optics)
A concave mirror which is a paraboloid of revolution and produces parallel rays of light from a source located at the focus of the parabola. Also known as parabolic reflector.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Sandler, "Paraboloidal reflector patterns for off-axis feed," IRE Transactions on Antennas and Propagation, vol.
Working together, they can alter any portion of the surface to form a real-time paraboloidal reflector with an effective diameter of 300 m.
The reason for choosing this range for a is that (1) for a conventional Cassegrain antenna, the focus of the hyperboloidal reflector has to be coincide with that of the paraboloidal reflector, which requires that the vertex of the hyperboloidal reflector lays between the two foci of the hyperboloidal reflector (a < 1); and (2) The vertexes of the two branch of the hyperboloidal reflector have to be separate with each other (0.5 < a);
CASE-1: The main dish is a paraboloidal reflector. The main parameters are as follows:
New IRA is designed using asymptotic conical dipole (ACD) as feeding TEM line and 46 cm paraboloidal reflector. The ACD feed profile is derived using equivalent charge method with only equivalent line charge [lambda](z) as suggested in [14].
The paraboloidal reflector has been commonly used as an optical focusing device in the IRAs [1].
Faryad, "Paraboloidal reflector in chiral medium supporting simultaneously positive phase velocity and negative phase velocity," Progress In Electromagnetics Research, Vol.
Focusing from a large size paraboloidal reflector, composed of two layers of chiral and/or chiral nihility metamaterials, is studied by utilizing the Maslov's method to give the remedy of GO which fails at caustic.
When both RCP and LCP waves are incident on the main paraboloidal reflector, it cause four reflected waves designated as LL, RR, LR and RL [17].
Above center is the huge paraboloidal reflector, its interior partly covered with reflecting material.
Zhen Cheng and Xin-Fa Jiang, Beijing Institute of Radio Measurement presented their paper, "Exact Analysis and Experiment of Coaxial Feeds," in which they derived an exact mathematical model for the feed of small paraboloidal reflector antennas, and verified their computed data by comparing them with experimental results.
For large angle scanning, even paraboloidal reflectors with large F/D ratios fail to generate high quality beams.