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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 470541, 11 pages
http://dx.doi.org/10.1155/2012/470541
Review Article

Near-Field Antenna Measurements Using Photonic Sensor of Mach-Zehnder Interferometer

National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan

Received 15 October 2011; Accepted 19 January 2012

Academic Editor: Amedeo Capozzoli

Copyright © 2012 Masanobu Hirose et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have been developing a photonic sensor system to measure the electric near-field distribution at a distance shorter than one wavelength from the aperture of an antenna. The photonic sensor is a type of Mach-Zehnder interferometer and consists of an array antenna of 2.4 mm height and 2 mm width on a L i N b O 3 substrate (0.5 mm thickness, 8 mm length, and 3 mm width) supported by a glass pipe. The photonic sensor can be considered to be a receiving infinitesimal dipole antenna that is a tiny metallic part printed on a small dielectric plate at microwave frequency. Those physical and electrical features make the photonic sensor attractive when used as a probe for near-field antenna measurements. We have demonstrated that the system can be applied to planar, spherical, and cylindrical near-field antenna measurements without any probe compensation approximately below 10 GHz. We show the theories and the measurements using the photonic sensor in the three near-field antenna measurement methods.