Antenna Pattern Measurements Using Photonic Sensor for Planar Near-Field Measurement at X Band

Masanobu HIROSE  Takayuki ISHIZONE  Koji KOMIYAMA  

IEICE TRANSACTIONS on Communications   Vol.E87-B   No.3   pp.727-734
Publication Date: 2004/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antenna and Propagation
antenna measurements,  planar near-field measurements,  photonic sensor,  standard gain horn antenna,  microstrip array antenna,  

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We have shown that a photonic sensor can be used as an electric-field probe for planar near-field measurements of X-band antennas. Because an antenna on the photonic sensor is small (about 0.1 λ) compared to the wavelength, the photonic sensor can directly measure the amplitude and the phase of the electric field close (about 0.3 λ) to the apertures of antennas without disturbing the electric field to be measured. Therefore we can obtain the antenna pattern by transforming the measured electric field without probe compensation. To verify the merits of the photonic sensor, we have evaluated the antenna patterns of a standard gain horn antenna and a microstrip array antenna at 9.41 GHz. Comparing the results obtained using the photonic sensor with those obtained using the conventional open-ended waveguide probe and other methods, we have shown that the antenna patterns agree with each other within 1 dB over wide ranges of directivity.