Accession Number : ADP001106

Title :   Evaluation of the Monopole-Slot as a Land-Mobile Communications Antenna,


Personal Author(s) : Halpern,B. M. ; Mayes,P. E.

Report Date : JAN 1983

Pagination or Media Count : 32

Abstract : Land-mobile communication systems designed to operate over the upper portion of the UHF band in an urban environment are very susceptible to frequent wide signal variations, also known as fades, which arise due to the presence of many obstructions in the propagation path between the transmitter and receiver. Degradation of system performance resulting from this type of fading must be overcome by means other than an increase in transmitter power. This paper describes a method of combating multipath fading which makes use of the fact that the resultant vertical electric field and horizontal magnetic fields of the incident waves at the same point in space are uncorrelated, and therefore, statistically independent. The method described incorporates a selection diversity combiner in the mobile unit.

Descriptors :   *Monopole antennas, *Slot antennas, *Directional antennas, *Strip transmission lines, *Antenna radiation patterns, *Omnidirectional antennas, *Conical antennas, Antenna feeds, Cavity resonators, Multipath transmission, Ground vehicles, Communication equipment, Performance(Engineering), Urban areas, Selection, Magnetic fields, Environments, Mobile, Horizontal orientation, Paths, Transmitters, Land areas, Vertical orientation, Propagation, Power, Electric fields, Mobility, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE