The reflection method is an accurate and simple method for measuring the radiation efficiency of a small antenna. However, it takes too long and has the disadvantage of underestimating the efficiency due to resonance in the cavity formed by the straight waveguide and two sliding shorts. To reduce the measurement time, one sliding short can be fixed while the other one is moved. To improve the accuracy of this technique, we can set the antenna to be measured at the center of the two sliding shorts or at a local anti-node of the standing wave in the waveguide. When one of the sliding shorts is fixed, the measured efficiency becomes negative at certain frequencies. We examine these reductions in efficiency using an equivalent transmission line model for the reflection method. We also derive analytical expressions for the overall efficiency in the above cases and verify new procedures that enable measurements to be performed without any drops in the measured efficiency.
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Nozomu ISHII, Yasuo KATAGIRI, Michio MIYAKAWA, "Analysis of the Reflection Method for Measuring the Radiation Efficiency Using the Transmission Line Model" in IEICE TRANSACTIONS on Communications,
vol. E90-B, no. 9, pp. 2394-2400, September 2007, doi: 10.1093/ietcom/e90-b.9.2394.
Abstract: The reflection method is an accurate and simple method for measuring the radiation efficiency of a small antenna. However, it takes too long and has the disadvantage of underestimating the efficiency due to resonance in the cavity formed by the straight waveguide and two sliding shorts. To reduce the measurement time, one sliding short can be fixed while the other one is moved. To improve the accuracy of this technique, we can set the antenna to be measured at the center of the two sliding shorts or at a local anti-node of the standing wave in the waveguide. When one of the sliding shorts is fixed, the measured efficiency becomes negative at certain frequencies. We examine these reductions in efficiency using an equivalent transmission line model for the reflection method. We also derive analytical expressions for the overall efficiency in the above cases and verify new procedures that enable measurements to be performed without any drops in the measured efficiency.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.9.2394/_p
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@ARTICLE{e90-b_9_2394,
author={Nozomu ISHII, Yasuo KATAGIRI, Michio MIYAKAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={Analysis of the Reflection Method for Measuring the Radiation Efficiency Using the Transmission Line Model},
year={2007},
volume={E90-B},
number={9},
pages={2394-2400},
abstract={The reflection method is an accurate and simple method for measuring the radiation efficiency of a small antenna. However, it takes too long and has the disadvantage of underestimating the efficiency due to resonance in the cavity formed by the straight waveguide and two sliding shorts. To reduce the measurement time, one sliding short can be fixed while the other one is moved. To improve the accuracy of this technique, we can set the antenna to be measured at the center of the two sliding shorts or at a local anti-node of the standing wave in the waveguide. When one of the sliding shorts is fixed, the measured efficiency becomes negative at certain frequencies. We examine these reductions in efficiency using an equivalent transmission line model for the reflection method. We also derive analytical expressions for the overall efficiency in the above cases and verify new procedures that enable measurements to be performed without any drops in the measured efficiency.},
keywords={},
doi={10.1093/ietcom/e90-b.9.2394},
ISSN={1745-1345},
month={September},}
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TY - JOUR
TI - Analysis of the Reflection Method for Measuring the Radiation Efficiency Using the Transmission Line Model
T2 - IEICE TRANSACTIONS on Communications
SP - 2394
EP - 2400
AU - Nozomu ISHII
AU - Yasuo KATAGIRI
AU - Michio MIYAKAWA
PY - 2007
DO - 10.1093/ietcom/e90-b.9.2394
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2007
AB - The reflection method is an accurate and simple method for measuring the radiation efficiency of a small antenna. However, it takes too long and has the disadvantage of underestimating the efficiency due to resonance in the cavity formed by the straight waveguide and two sliding shorts. To reduce the measurement time, one sliding short can be fixed while the other one is moved. To improve the accuracy of this technique, we can set the antenna to be measured at the center of the two sliding shorts or at a local anti-node of the standing wave in the waveguide. When one of the sliding shorts is fixed, the measured efficiency becomes negative at certain frequencies. We examine these reductions in efficiency using an equivalent transmission line model for the reflection method. We also derive analytical expressions for the overall efficiency in the above cases and verify new procedures that enable measurements to be performed without any drops in the measured efficiency.
ER -