Apparatus for scanning and measuring the near-field radiation of

Communications: radio wave antennas – Antennas – Measuring signal energy

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324 95, 340600, G01R 2908

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active

047046147

ABSTRACT:
Apparatus for measuring the near-field radiation of an antenna such that its far-field radiation characteristics can be determined. The invention utilizes the principle of the Foucault pendulum. It uses a bob attached to a long pendulum arm that is free to rotate. Rotation of the earth causes an apparent rotation of the swing plane of the pendulum with a period of T=24/sin (latitude). By attaching a field sensing probe to the pendulum bob and mounting the antenna under the Foucault pendulum, the entire antenna aperture can be scanned without moving the antenna. The motion of the probe covers part of an external sphere centered at the pivot point of the pendulum and having a radius equal to the length of the pendulum. Appropriate transformation of the measured near-field data gives the far-field radiation pattern.

REFERENCES:
patent: 3641439 (1972-02-01), Asian
patent: 3787866 (1974-01-01), Gamertsfelder et al.
patent: 3879733 (1975-04-01), Hansen et al.
patent: 3932745 (1976-01-01), Hartman
patent: 4070621 (1978-01-01), Bassen et al.
patent: 4201987 (1980-05-01), Tricoles et al.
Paris et al., "Basic Theory . . . Measurements", IEEE Trans. on Antenna and Propagation, vol. AP-26, No. 3, May, 1978, pp. 373-379.
"Applications of Probe-Compensated Near-Field Measurement," D. T. Paris et al., IEEE Tran. A. P., vol. 33, pp. 379-389.

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