Specifications

ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
-
04)
64
Annex B (normative):
Test sites and arrangements for radiated measurement
This annex introduces three most commonly available test sites and a test fixture, to be used in the radiated
measurements in accordance with the present document.
Subsequently the following items will be described:
• Open Area Test Site (OATS);
• Semi Anechoic Room (SAR);
• Fully Anechoic Room (FAR);
• Test fixture for relative measurements.
The first three are generally referred to as free field test sites. Both absolute and relative measurements can be
performed on these sites. They will be described in clause B.1. Clause B.2 describes the antennas used in these test
sites. The test fixture can only be used for relative measurements, and will be described in clause B.3.
Where absolute measurements are to be carried out, the chamber should be verified. A detailed verification procedure is
described in clause 6 of TR 102 273-4 [i.14] for the OATS, in clause 6 of TR 102 273-3 [i.13] for the SAR, and in
clause 6 of TR 102 273-2 [i.12] for the FAR.
Information for calculating the measurement uncertainty of measurements on one of these test sites can be found in
TR 100 028-1 [1] and TR 100 028-2 [i.15], TR 102 273-2 [i.12], TR 102 273-3 [i.13] and TR 102 273-4 [i.14].
B.1 Radiation test sites
B.1.1 Open Area Test Site (OATS)
An Open Area Test Site comprises a turntable at one end and an antenna mast of variable height at the other end above
a ground plane which, in the ideal case, is perfectly conducting and of infinite extent. In practice, while good
conductivity can be achieved, the ground plane size has to be limited. A typical Open Area Test Site is shown in
figure B.1.