Communications: radio wave antennas – Antennas – Measuring signal energy
Patent
1989-06-19
1991-03-19
Hille, Rolf
Communications: radio wave antennas
Antennas
Measuring signal energy
G01R 2908
Patent
active
050014943
ABSTRACT:
A miniature anechoic changer for testing antennas capable of producing radio frequency energy with a planar wavefront substantially uniform and free of distortion is shown. The chamber is comprised of a source antenna located in the near field of the test antenna radiating radio frequency energy having a wavefront with an amplitude having a distribution pattern that approximates (SIN X)/X and a lens having a focal point mounted such that the focal point of the lens is located in the center of the source antenna. As the source antenna radiates energy the energy passing through the lens is converted from a spherical wavefront to a planar wavefront substantially uniform and free of distortion.
REFERENCES:
patent: 3806943 (1974-04-01), Holloway
patent: 4218683 (1980-08-01), Hemming
patent: 4387467 (1983-06-01), Kirby
patent: 4837581 (1989-06-01), Hansen et al.
Keen, K. M., Simulation of a Proposed Near-Field-to-Far-Field Antenna Measurement System, Electronics Letters, vol. 13, No. 8, Apr. 1977.
Dorman Gerald C.
Ranghelli Joseph
Brown Peter Toby
Hille Rolf
Mofford Donald F.
Raytheon Company
Sharkansky Richard M.
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