Reflector Antennas

Abstract

Reflector antennas are a primary means of transmitting communications signals from point‐to‐point. This section briefly summarizes the important characteristics and design considerations of reflector antennas, including farfield radiation pattern, antenna gain and beamwidth, single and dual reflectors, offset designs to prevent blockage, aperture phase errors and the effects of optical aberrations, and wide field of view scanning systems.

Probing Through-Space Polar−π Interactions in 2,6-Diarylphenols

“…Phenols represent an important class of aromatic molecules that display interesting physicochemical properties and biological activities. , Physical-organic chemistry investigations on substituted phenols revealed that the acidity of phenol is significantly altered by electron-donating and electron-withdrawing groups at ortho -, meta -, or para -positions. − Notably, p K a values of para -substituted phenols exhibit a linear dependence on the Hammett σ values. Collectively, chemical studies demonstrated that substituent effects on the acidity of phenols are primarily a result of through-bond mechanisms.…”

Ab Initio and Density Functional Theory Study of Keto–Enol Equilibria of Deltic Acid in Gas and Aqueous Solution Phase: A Bimolecular Proton Transfer Mechanism

“…Although a number of measurements of the equilibrium constant for the tautomerization of a variety of keto–enol systems can be found in the literature, − only relatively few theoretical investigations have been carried out. − In one study, ab initio HF and MP2 calculations were used to compute the relative energy differences between phenol and 2,4- and 2,5-cyclohexadienone. The equilibrium constant for phenol ⇆ 2,4-cyclohexadienone was evaluated to be 1.98 × 10 –13 .…”