Accession Number : AD0737308

Title :   Exploitation and Performance of Forest Trees as Antennas for Radio Communications in Dense Forest Covered Terrains (Synopsis of Lebanon State Forest, N. J. Experiments).

Descriptive Note : Research and development technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Ikrath,Kurt ; Johnson,Ronald ; Murphy,Kenneth ; Hoverter,Robert ; Kennebeck,William

Report Date : NOV 1971

Pagination or Media Count : 30

Abstract : A new approach for the solution of the problem associated with the transmission of electromagnetic energy in dense forests was conceived and successfully demonstrated in field experiments. In actual testing in dense vegetation, forest trees coupled with a toroidal Hybrid Electromagnetic Antenna Coupler (HEMAC) showed themselves to be superior in performance to a vertical whip antenna. The analysis of the data compiled indicate that the signal emitted thru the use of a HEMAC in a forest duct decays as 1/r and 1/square root of r which indicates the existence of both space and surface wave modes. (Author)

Descriptors :   (*OMNIDIRECTIONAL ANTENNAS, TREES), (*JUNGLES, COMMUNICATION AND RADIO SYSTEMS), RADIO TRANSMISSION, ANTENNA COMPONENTS, COUPLING CIRCUITS, COILS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE