187 research outputs found
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
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