TECHNIQUE FOR MEASURING RADIATION PATTERNS OF ARRAY ANTENNAS.
ADVANCED TECHNOLOGY CORP TIMONIUM MD
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A technique for measuring the radiation patterns of multi-element antenna arrays was developed which eliminates the need for feed lines to the individual elements. The array is readily modelled in a convenient size by machining or by photo-etching techniques. The measurements are made at millimeter wave frequencies on a radiation pattern range with a special test fixture described herein. The array is modelled as an array of holes in a ground plane. It is placed at one end of a tunnel lined with absorbent material with a horn antenna at the opposite end. The tunnel is placed on a turntable of a pattern range and the diffraction pattern is measured. The accuracy of the technique was proven by measurement of apertures up to 28 wavelengths square. A larger array of 16,000 elements was photo-etched but could not be tested since the limited power available was insufficient to work in the far field of such an array. The technique is versatile for it can model a variety of antenna elements, array configurations including unequal spacings, and different polarizations. Author