TY - JOUR
T1 - Electromagnetic Coupling Effects on the Cavity Measurement of Antenna Efficiency
AU - Huang, Yeqin
AU - Narayanan, Ram M.
AU - Kadambi, Govind R.
N1 - Funding Information:
Manuscript received September 14, 2002; revised January 14, 2003. This work was supported in part by Centurion Wireless Technologies and the Nebraska Research Initiative Mobile Communications Research Project. Y. Huang was with the Department of Electrical Engineering, University of Nebraska, Lincoln, NE 68588 USA. He is now with the Department of Electrical Engineering, Tulane University, New Orleans, LA 70118 USA. R. M. Narayanan is with the Department of Electrical Engineering, University of Nebraska, Lincoln, NE 68588 USA (e-mail: [email protected]). G. R. Kadambi is with Centurion Wireless Technologies, Incorporated, Lincoln, NE 68504 USA. Digital Object Identifier 10.1109/TAP.2003.818802
PY - 2003/11
Y1 - 2003/11
N2 - Electromagnetic coupling effects on the antenna in a conducting cavity are studied theoretically and experimentally. It is observed in experiments that at the resonant frequencies of the cavity, the input resistance of the antenna attains values two or three orders of magnitude higher than that at frequencies away from resonance. It is shown via theoretical analysis that the input resistance of the antenna measured at resonant frequencies of the cavity is not merely the loss resistance desired in computing the antenna efficiency, but is actually the sum of the loss resistance of the antenna and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole and monopole antennas. The computational results for the input resistance are in agreement with the measured data. A method is proposed to avoid the cavity-antenna antiresonance in the measurement.
AB - Electromagnetic coupling effects on the antenna in a conducting cavity are studied theoretically and experimentally. It is observed in experiments that at the resonant frequencies of the cavity, the input resistance of the antenna attains values two or three orders of magnitude higher than that at frequencies away from resonance. It is shown via theoretical analysis that the input resistance of the antenna measured at resonant frequencies of the cavity is not merely the loss resistance desired in computing the antenna efficiency, but is actually the sum of the loss resistance of the antenna and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole and monopole antennas. The computational results for the input resistance are in agreement with the measured data. A method is proposed to avoid the cavity-antenna antiresonance in the measurement.
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U2 - 10.1109/TAP.2003.818802
DO - 10.1109/TAP.2003.818802
M3 - Article
AN - SCOPUS:0242696193
SN - 0018-926X
VL - 51
SP - 3064
EP - 3071
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 11
ER -