Title :
Effects of RF absorbers on measurements of small antennas in small anechoic chambers
Author :
Icheln, C. ; Ollikainen, J. ; Vainikainen, P.
Author_Institution :
IRC/Radio Lab., Helsinki Univ. of Technol., Espoo, Finland
fDate :
11/1/2001 12:00:00 AM
Abstract :
In this work, the influence of resistive absorbers in the vicinity of small antennas was investigated, in order to define a lower limit for the size of a small anechoic chamber for antenna calibration and radiation pattern measurements, with respect to the distance between the antenna under test (AUT) and the RF absorbers lining the walls. Furthermore, the influence of a relatively narrow transmission channel, formed by the absorbers on the side walls between the measurement antenna and the AUT was investigated. It was found by measurements that absorbers with the length of 610 mm do not have a measurable effect on the radiation characteristics of a small antenna at around 1.8 GHz, as long as they are kept more than 100 mm from the AUT, and the transmission channel formed by the absorbers between the antennas is wider than 100 mm
Keywords :
anechoic chambers (electromagnetic); antenna radiation patterns; antenna testing; calibration; electromagnetic wave absorption; 1.8 GHz; RF absorber; antenna under test; calibration; radiation pattern measurement; resistive absorber; small anechoic chamber; small antenna; transmission channel; Anechoic chambers; Antenna measurements; Antenna radiation patterns; Length measurement; Mobile antennas; Mobile communication; Radio frequency; Reflection; Size measurement; Transmitting antennas;
Journal_Title :
Aerospace and Electronic Systems Magazine, IEEE
