Altitude profile of the reception field strength of centimeter waves
Abstract
In line-of-sight radio-relay links, multipath propagation causes a heavy height dependence of the field strength at the receiving site. This phenomenon was investigated by means of 14 antennas mounted one above the other with 2-m spacing. Only a small part of the fadeouts and the fadeups was covered by the two-path model. The three-path model proved to be much more adapted to this purpose. In this case the amplitudes of the three waves and the differences of their angles of arrival were found as the parameters of the fading curves. At fadeups the highest one of the amplitudes often is larger than in the case of undisturbed transmission. At fadeouts, it is often smaller; i.e., strong focusing and defocusing effects occur together with the multipath propagation. Multipath fading is more likely to be caused by refraction in the atmosphere than by reflection.
- Publication:
-
Kleinheubacher Berichte
- Pub Date:
- 1984
- Bibcode:
- 1984KlBer..27..147G
- Keywords:
-
- Centimeter Waves;
- Field Strength;
- Microwave Antennas;
- Multipath Transmission;
- Radio Relay Systems;
- Height;
- Line Of Sight;
- Signal Fading;
- Communications and Radar