The influence of conducting flaps on the reflection coefficient of a parallel-plate waveguide illuminating a conducting sheet

Conducting flap effects on reflection coefficient of parallel-plate waveguide illuminating conducting shee

Aperture reflection coefficient of a parallel- plate waveguide by wedge diffraction analysis

Aperture reflection coefficient of parallel plate waveguide by wedge diffraction analysi

The Te-d1 mode reflection coefficient of a ground-plane mounted parallel-plate waveguide illuminating a reflecting sheet

Symmetric parallel plate waveguide reflection coefficient analyze

Application of wedge diffraction to antenna theory

Geometrical optics techniques for diffraction available for antenna analysi

Radiation pattern of a ground-plane mounted parallel-plate waveguide analyzed by a surface integration technique

Surface integration analysis of radiation pattern of parallel plate waveguid

A new approach for shaping of dual-reflector antennas

The shaping of 2-D dual-reflector antenna systems to generate a prescribed distribution with uniform phase at the aperture of the second reflector is examined. This method is based on the geometrical nature of Cassegrain and Gregorian dual-reflector antennas. The method of syntheses satisfies the principles of geometrical optics which are the foundations of dual-reflector designs. Instead of setting up differential equations or heuristically designing the subreflector, a set of algebraic equations is formulated and solved numerically to obtain the desired surfaces. The caustics of the reflected rays from the subreflector can be obtained and examined. Several examples of 2-D dual-reflector shaping are shown to validate the study. Geometrical optics and physical optics are used to calculate the scattered fields from the reflectors

Higher-order diffraction concept applied to parallel-plate waveguide patterns

Higher order diffraction concept applied to computation of parallel-plate waveguide aperture radiation pattern

Slope diffraction analysis of TEM parallel- plate guide patterns

Slope diffraction analysis of TEM parallel plate guide pattern

Prediction of the pattern performance for the Aeroassist Flight Experiment (AFE) spacecraft

In order to provide a set of benchmark flight data for a reusable Aeroassisted Orbit Transfer Vehicle (AOTV) application, NASA undertook the development of an Aeroassisted Flight Experiment (AFE) which will be launched from the Space Shuttle. A representative aeroassist trajectory will be flown and sensor measurements of aerodynamic performance, thermal protection response, and plasma ionization reentry effects will be obtained. Discussed here is the spacecraft antenna. Estimates of signal transmissions from the AFE to the Tracking and Data Relay Satellites (TDRS) during the reentry period are given. The computer modeling of the antennas is presented with and without the reentry plasma

Accuracy of approximate formulations for near-field wedge diffraction of a line source

Diffraction of a cylindrical wave by a wedge for application to antenna diffraction problem