TY - JOUR
T1 - Uncertainty in reverberation-chamber antenna-efficiency measurements in the presence of a phantom
AU - Bronckers, L.A.
AU - Remley, Kate A.
AU - Jamroz, Ben
AU - Roc'h, Anne
AU - Smolders, A.B.
PY - 2020/6
Y1 - 2020/6
N2 - The effect of a user's proximity on wireless device performance is critical to test the device under realistic conditions. In this article, we propose and demonstrate an improved uncertainty estimation method for antenna efficiency measurements in a reverberation chamber. The improved method separately computes uncertainties due to the effects of chamber loading by a phantom and the effects of antenna mismatch introduced by this phantom, illustrating the sensitivity of uncertainty to close-proximity user effects. We demonstrate that, while the impact of the phantom may be significant on antenna efficiency, and, it has some influence on the uncertainty in the measurement, its impact on overall uncertainty may be insignificant. This is demonstrated using the two-antenna method in the presence of a phantom close to the antenna under test. We illustrate the method by summarizing the antenna efficiencies with their uncertainties and the impact of the phantom for important communication bands. Due to the large effect of the user on antenna performance, this type of measurement and its uncertainty evaluation is a valuable way to characterize antenna efficiency including user effects.
AB - The effect of a user's proximity on wireless device performance is critical to test the device under realistic conditions. In this article, we propose and demonstrate an improved uncertainty estimation method for antenna efficiency measurements in a reverberation chamber. The improved method separately computes uncertainties due to the effects of chamber loading by a phantom and the effects of antenna mismatch introduced by this phantom, illustrating the sensitivity of uncertainty to close-proximity user effects. We demonstrate that, while the impact of the phantom may be significant on antenna efficiency, and, it has some influence on the uncertainty in the measurement, its impact on overall uncertainty may be insignificant. This is demonstrated using the two-antenna method in the presence of a phantom close to the antenna under test. We illustrate the method by summarizing the antenna efficiencies with their uncertainties and the impact of the phantom for important communication bands. Due to the large effect of the user on antenna performance, this type of measurement and its uncertainty evaluation is a valuable way to characterize antenna efficiency including user effects.
KW - Antenna efficiency measurements
KW - human phantom
KW - measurement uncertainty
KW - reverberation chambers
KW - user effects
KW - wireless system
UR - http://www.scopus.com/inward/record.url?scp=85086081784&partnerID=8YFLogxK
U2 - 10.1109/TAP.2020.2969883
DO - 10.1109/TAP.2020.2969883
M3 - Article
C2 - 34121757
AN - SCOPUS:85086081784
VL - 68
SP - 4904
EP - 4915
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 6
M1 - 8979295
ER -