Microwave radiation source

Details Microwave radiation source Microwave radiation source

1993-10-28

1995-05-30

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

343721, 342371, H01Q 322, H01Q 324, H01Q 106

Patent

active

054205956

ABSTRACT:
A source of collimated beam or beams of microwave electromagnetic radiation pulses comprises a photoconductor substrate having a major surface and an optical radiation source providing a beam of optical radiation pulses for illuminating at least a relatively large aperture region of the major surface. A static electric field, intrinsic or applied, is present at the major surface for driving transient photocurrents generated by the beam of optical radiation pulses. Each beam of microwave electromagnetic radiation pulses emitted from the photoconductor substrate may be steered by varying the angle of incidence of the beam of optical radiation pulses illuminating the major surface, by varying the period of the spatial variation of a static electric field applied to the major surface by means of electrodes, or by varying the period or direction of a periodic intensity variation of a spatially modulated beam of optical radiation pulses on the major surface.

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patent: 4855749 (1989-08-01), DeFonzo
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patent: 5014069 (1991-05-01), Seiler et al.
patent: 5130690 (1992-07-01), Ando et al.
"Generation of Fermtosecond Electromagnetic Pulses From Semiconductor Surfaces", Appl. Phys. Lett. 56 (1990), pp. 1011-1013.
Hu et al, "Optically Steerable Photoconducting Antennas", Appl. Phy. Letters 56, 5 Mar. 1990, pp. 886-888.
Zhang et al, "Generation of Femtosecond Pulses Semiconductor Surfaces", Appl. Phy. Letters 56, 12 Mar. 1990 pp. 1011-1013.

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