Title :
Calibration of directional antennas and limitations in their use
Author_Institution :
Tech. Univ. Wroclaw, Poland
fDate :
10/1/2000 12:00:00 AM
Abstract :
An error due to a directional antenna calibration on an open area test site (OATS) is discussed with an example of a log-periodic (LP) antenna and the substitution method. It is shown that the accuracy of the calibration may be improved by the distance choice, a directional transmitting antenna (TA) use, calibration on a site of reduced reflection coefficient, and the use of calculated or measured correction factors. The approach may be applied to arbitrary directional antennas. Then, limitations in the use of directional antennas for electromagnetic field (EMF) measurements in the conditions of multipath propagation are discussed, and the concept of an omnidirectional set is presented
Keywords :
antenna radiation patterns; antenna testing; calibration; directive antennas; electromagnetic fields; field strength measurement; log periodic antennas; measurement errors; accuracy; calibration; directional antennas; directional transmitting antenna; electromagnetic field measurement; log-periodic antenna; measured correction factors; multipath propagation; omnidirectional set; open area test site; reduced reflection coefficient; substitution; Antenna measurements; Antennas and propagation; Calibration; Directional antennas; Directive antennas; Electromagnetic measurements; Log periodic antennas; Open area test sites; Reflector antennas; Transmitting antennas;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
