Communications: radio wave antennas – Antennas – Wave guide type
Patent
1989-09-15
1991-05-07
Hille, Rolf
Communications: radio wave antennas
Antennas
Wave guide type
343786, H01Q 1300
Patent
active
050140698
ABSTRACT:
A photoconductive antenna modulator which optically modulates a radio frequency carrier signal from a dielectric waveguide antenna is disclosed. A photoconductor film is placed in proximity with the dielectric waveguide antenna such that the radio frequency carrier signal from the antenna must be conducted through the film when it is radiated into space. The carrier is then optically modulated by variably illuminating the photoconductor film with light which has wavelengths near the photoconductor film's spectral region of photoconductor sensitivity, which decreases the photoconductor film's transparency to the radio frequency carrier signal. By varying the strength of the illumination on the photoconductor film, one is able to optically modulate the radio frequency carrier signal propagated through the photoconductor.
REFERENCES:
patent: 3222601 (1965-12-01), Sartorio
patent: 4150382 (1979-04-01), King
patent: 4575727 (1986-03-01), Stern et al.
Seiler Milton R.
Walcott Kenneth J.
Auton William G.
Hille Rolf
Le Hoang-anh
Singer Donald J.
The United States of America as Represented by the Secretary of
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