Spherical antennas having isotropic radiation patterns

Details Spherical antennas having isotropic radiation patterns Spherical antennas having isotropic radiation patterns

H - Electricity

01

Q

351/31

H01Q 13/00 (2006.01) H01Q 5/00 (2006.01) H01Q 9/04 (2006.01) H01Q 13/18 (2006.01)

Patent

CA 1119290

ABSTRACT OF THE DISCLOSURE Spherical antenna arrangements are disclosed utilizing annular slots in polar regions which are associated with resonant cavities having a TE01 mode or a TE11 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 hermis- pherical 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 characteristic 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.

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