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IEICE Transactions on Communications 2005 E88-B(8):3140-3145; doi:10.1093/ietcom/e88-b.8.3140
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Copyright © 2005 The Institute of Electronics, Information and Communication Engineers

Special Section of 2004 International Symposium on Electromagnetic Compatibility -- Papers -- Measurements

Magnetic Near-Field Distribution Measurements above a Patch Antenna by Using an Optical Waveguide Probe

Masanori TAKAHASHI1, Hiroyasu OTA1, Ken Ichi ARAI1 and Risaburo SATO1

1 The authors are with Sendai EMC Research Center, National Institute of Information and Communications Technology (NICT), Sendai-shi, 989-3204 Japan. E-mail: takamasa{at}nict.go.jp

A magnetic field probe consisting of a LiNbO3 optical waveguide modulator and a loop antenna element was developed to enable accurate measurement of magnetic near-fields in the gigahertz range. The invasiveness of the probe was assessed by using it to measure the magnetic field distribution above a patch antenna operating at 2.49 GHz. The measurements were compared with those obtained using a shielded loop probe. The experimental results obtained using the probe were also compared with simulation results obtained using a finite-difference time-domain (FDTD) method. The overall results indicated that the optical waveguide probe was capable of accurately measuring magnetic near-fields with low disturbance of the measured fields.

Key Words: magnetic field probe, optical waveguide modulator, invasiveness, patch antenna

Manuscript received November 18, 2004. Manuscript revised March 14, 2005.


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M. TAKAHASHI, E. SUZUKI, S. ARAKAWA, H. OTA, K. I. ARAI, and R. SATO
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[Abstract] [PDF]


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