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A STUDY OF CIRCULAR ARRAYS. -1-. EXPERIMENTAL EQUIPMENT
HARVARD UNIV CAMBRIDGE MA CRUFT LAB
Pagination or Media Count:
Construction details are given for experimental equipment designed to permit measurement of the self and mutual admittances, current distributions along the radiating elements, and far field radiation patterns of small antenna arrays. The antennas are formed by extending the longitudinally slotted inner conductor of a rigid coaxial line beyond a large groundplane while terminating the outer conductor on the ground plane. A small balanced loop probe can be moved along the slot to sample the tangential magnetic field near the conductor. Measurement errors due to the probe are discussed. The array under test can be rotated by means of a turntable which is described. Radiation patterns are measured by transmitting with the array under test and receiving with a corner reflector antenna mounted on the groundplane but in the far field of the array. Although designed for 663 Mcps the equipment will operate over a wide range of frequencies.
APPROVED FOR PUBLIC RELEASE