Electromagnetic radiation sensor

Details Electromagnetic radiation sensor Electromagnetic radiation sensor

1989-02-03

1991-07-09

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Microstrip

343911R, H01Q 1508

Patent

active

050309625

ABSTRACT:
An electromagnetic radiation sensor for use at microwave frequencies compes a sheet substrate bearing an array of dipolar antennas. The antennas have respective mixer diodes connected between adjacent dipole limbs, and the antenna array is located in the focal plane of a dielectric lens. Individual antenna center positions correspond to different beam directions for radiation incident on the lens, and the antenna center positions are in accordance with the Rayleigh resolved spot criterion. The dimensions, dielectric properties and relative positioning of the lens and substrate are such as to provide for the antennas to couple predominantly to radiation passing through the lens. The substrate thickness may lie between the lens and antenna array, or alternatively the array may lie between the substrtate and lens. In the latter case, the lens is of higher dielectric constant material than the substrate, at least in the lens region adjacent the array. The sensor of the invention provides a robust, low cost means of monitoring radiation directionally without requiring scanning means.

REFERENCES:
patent: 3373425 (1968-03-01), Barischoff
patent: 3781896 (1973-12-01), Toulis
patent: 4122449 (1978-10-01), Endo
patent: 4125810 (1978-11-01), Pavio
patent: 4331957 (1982-05-01), Enander et al.
patent: 4387378 (1983-06-01), Henderson

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