Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1988-07-15
1989-07-04
Buczinski, Stephen C.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
505866, H01Q 916
Patent
active
H00006530
ABSTRACT:
A superconducting, superdirective antenna array wherein a superconductive terial is employed for the elements of the array which are arranged in a uniform half-wave dipole has low ohmic resistance and a very high radiation efficiency. The superdirective antenna array which is a linear array has element spacing less than .lambda.o/2 where .lambda.o is the center frequency of the dipoles. The material of the array elements has a very high critical current (i.e., and a critical magnetic field), a requirement for maximum efficiency. The superconducting, superdirective antenna array is housed in a vacuum insulated container and is provided outlet connecting to means for obtaining and sustaining a vacuum as required for element material of fabrication. The material of fabrication for the antenna array elements is selected from a type II superconductor material selected from the group consisting of iridiumm, lead, mercury, tantalum, vanadium, a composite of niobium-tin-bronze, and alloys of the same. The antenna array element material of fabrication, as fabrication techniques become available, can be a superconductive material selected from the ceramic oxides composition group consisting of La.sub.2-x Ba.sub.x CuO.sub.x and YBa.sub.2 Cu.sub.3 O.sub.x wherein x is an integer and wherein the transition temperature ranges from about 30.degree. K. to about 93.degree. K., and the thallium-calcium-barium-copper oxide family of compounds with a transition temperature as high as 125.degree. K. A dielectric window is employed for directing radiation of a very high directivity from the superconducting, superdirective antenna array.
Buczinski Stephen C.
Bush Freddie M.
Deaton James T.
The United States of America as represented by the Secretary of
Wallace Linda J.
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