Accession Number : ADD007773

Title :   Spherical Antennas having Isotropic Radiation Patterns.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : DeSantis,Charles M ; Schwering,Felix

Report Date : 22 Jan 1980

Pagination or Media Count : 10

Abstract : Spherical antenna arrangements are disclosed utilizing annular slots in polar regions which are associated with resonant cavities having a TE sub 01 mode or a TE sub 11 mode of field distribution. This field distribution within the cavity produces a cosine field distribution around the annular slot which serves via proper cavity excitation to produce nearly hemispherical isotropic radiation characteristics. The resonant cavities may take on the form of a parallel-plate structure or a coaxial cylindrical structure. Circular polarization and hemispherical coverage with uniform gain is characteristics of the antenna when the cavities contain probes placed ninety degrees apart in azimuth at the same radius from center and coupled to the quadrature phase related ports of a signal coupler. (Author)

Descriptors :   *Patents, *Slot antennas, *Antenna radiation patterns, Cavity resonators, Polar regions, Electric fields, Spheres, Isotropism, Polarization, Distribution, Circular

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE