Properties of scalar antenna arrays in a simple duct with a varying surface layer
Abstract
Effects of a reflecting duct, consisting on the lower side of a horizontal plane surface and on the top side of a static sinusoidal surface, on acoustic waves emitted at a certain distance from the antenna were studied. The mathematical functions, containing as main parameters the geometrical disposition, the energy conversion coefficient of the antenna elements, the reflection characteristics, the form of the reflecting surface, and the relative position of reflecting surface and antenna, are established. Numerical applications, using directly measurable parameters for typical excitations of linear and circular arrays, are presented.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- February 1982
- Bibcode:
- 1982STIN...8313331S
- Keywords:
-
- Antenna Arrays;
- Antenna Radiation Patterns;
- Ducts;
- Reflected Waves;
- Scalers;
- Sound Waves;
- Efficiency;
- Energy Conversion;
- Horizontal Orientation;
- Sine Waves;
- Surface Layers;
- Communications and Radar