Accession Number : ADD008571

Title :   Electron Beam-Semiconductor Diode Hybrid Device for Phase Control.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Yoder,Max N

Report Date : 21 Apr 1981

Pagination or Media Count : 7

Abstract : This invention relates to phase-control devices and methods and especially to electron-beam/semiconductor-diode means for independently controlling the phase of rf or microwave signals. In the transmission of radar signals, antenna arrays are employed in which the phases of the signals radiated by the various antennas in the array are different so that a beam is formed in a certain direction. It would be desirable, also, to have a technique and means for varying the phases of the signals received by such an antenna array. A broadband antenna beam scanning technique does exist whereby, in theory, a compatible microwave receiver could be built. A strip transmission line whose conductors are separated by a ferroelectric dielectric is employed. The velocity of propagation along the transmission line is in inversely proportional to the value of the dielectric constant of the insulator. A direct- current bias applied to this line, through the action of the ferroelectric coupling constants, changes the value of the dielectric constant and thereby varies the signal transit time. Unfortunately, the transmission velocity is varied. Another inherent limitation is the high loss tangent of the ferroelectric insulator which manifests itself in large signal attenuation. (Author)

Descriptors :   *Patents, *Electron beams, *Traveling waves, *Semiconductors, *Control systems, *Phase, *Semiconductor diodes, Output, Deflection, P type semiconductors, Hybrid systems, Schematic diagrams, Microwaves, Beam forming, Feedback

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE