Spherical antennas having isotropic radiation patterns

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

1978-09-13

1980-01-22

Moore, David K.

Communications: radio wave antennas

Antennas

Slot type

343769, 343767, 343898, H01Q 1310

Patent

active

041852893

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 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.

REFERENCES:
patent: 3100892 (1963-08-01), Cutler
patent: 4032917 (1977-06-01), Chin et al.
Stratton, J. A., Electromagnetic Theory, 1941, McGraw Hill, pp. 558-561.
Harrington, R. F., Time Harmonic Electromagnetic Fields, 1961, McGraw Hill, p. 298-303.
Weeks, W. L., Electromagnetic Theory for Engineering Applications, Wiley and Sons, pp. 541-549.

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