Abstract
Aperture amplitude and phase distributions in a planar array antenna with a beam forming network using Fourier optics and photomixing have been successfully measured. In this measurement, we used two laser diode pumped Nd:YAG lasers with oscillating wavelength of 1.3 micron region and obtained an L-band microwave signal by optical heterodyne detection. We estimated beam scanning characteristics by shifting transversally the position of the pinhole image mask. Furthermore, the diameters of the pinhole image mask were changed and the far field patterns were evaluated on the basis of the measured microwave aperture amplitude and phase distributions. As a result, the beamwidth of the far field pattern was proportional to the aperture diameter of the image mask.
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