NCJ Number
18020
Date Published
1973
Length
52 pages
Annotation
A DISCUSSION OF ELECTRICALLY SMALL ANTENNAS, ANTENNA TYPES, BODY EFFECTS ON THE ANTENNA, AND FACTORS IN SYSTEM DESIGN.
Abstract
AN ASSESSMENT OF THE TECHNOLOGY OF BODY-MOUNTED ANTENNAS IS PRESENTED THAT INCLUDES A SURVEY OF THE RADIATORS APPLICABLE TO THE LAW ENFORCEMENT ASSISTANCE ADMINISTRATION (LEAA) POLICE PERSONAL RADIO. A DISCUSSION OF ELECTRICALLY SMALL ANTENNAS PROVIDES AN UNDERSTANDING OF THE LIMITATIONS IN ANTENNA EFFICIENCY, BANKWIDTH, AND OF THE NEAR ENVIRONMENT. THE ANTENNAS TECHNOLOGY IS DRAWN FROM THE OPEN LITERATURE AND FROM DEPARTMENT OF DEFENSE AND NATIONAL AERONAUTICS/AND SPACE AGENCY EXPERIENCES WITH THEIR MANPACK ANTENNAS FOR THE FOOT SOLDIER AND APOLLO ASTRONAUTS. THE EFFECT OF THE HUMAN BODY ON THE ANTENNA RADIATION PATTERNS IS SHOWN. DATA ARE INCLUDED FOR THE ANTENNA AT WAIST LEVEL AND IN A HANDHELD POSITION. OTHER FACTORS, SUCH AS BIOLOGICAL EFFECTS FROM A TRANSMITTING ANTENNA VERY NEAR TO THE HUMAN BODY, PROPAGATION LOSSES, AND RADIO FREQUENCY NOISE IN THE VHFUHF SPECTRUM, ARE DISCUSSED BRIEFLY. A TEST PLAN FOR LABORATORY MEASUREMENTS OF CANDIDATE ANTENNAS AND BODY EFFECTS EXPERIMENTS IS OUTLINED. (AUTHOR ABSTRACT)