Dielectric image line groove antennas for millimeterwaves
Abstract
Grooves in the ground plane of dielectric image lines are proposed as a new radiating structure. A figure is included showing the proposed groove structure as a discontinuity in a dielectric image line. A wave incident on the dielectric image line is partly reflected by the discontinuity, partly transmitted across the groove, and partly radiated into space above the line. In a travelling-wave antenna, a number of grooves are arranged below a dielectric guide, with spacings around one guide wavelength to produce a beam in the upper half space. A prescribed aperture distribution can be effected by tapering the series radiation resistance of the grooves. This can be done by adjusting the depths of the grooves with a constant width or by varying the widths of the grooves with a constant depth. Attention is also given to circular grooves. Here, the widths of the holes are chosen so that they can be considered as waveguides operating far below the cut-off frequency of the fundamental circular waveguide mode.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf...59S
- Keywords:
-
- Dielectrics;
- Grooves;
- Microwave Antennas;
- Millimeter Waves;
- Waveguide Antennas;
- Antenna Radiation Patterns;
- Equivalent Circuits;
- Traveling Waves;
- Communications and Radar