Title :
The effects of RF absorbers on measurements of small antennas in small anechoic chambers
Author :
Icheln, C. ; Ollikainen, J. ; Vainikainen, P.
Author_Institution :
Radio Lab., Helsinki Univ. of Technol., Espoo, Finland
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 any 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 :
UHF antennas; anechoic chambers (electromagnetic); antenna radiation patterns; antenna testing; calibration; electromagnetic wave absorption; 1.8 GHz; RF absorber; anechoic chamber; antenna measurement; antenna under test; calibration; radiation pattern; resistive absorber; transmission coefficient; Anechoic chambers; Antenna measurements; Antenna radiation patterns; Frequency measurement; Ice; Laboratories; Loaded antennas; Mobile antennas; Radio frequency; Testing;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.776748
