Spherical Antennas having Isotropic Radiation Patterns.
DEPARTMENT OF THE ARMY WASHINGTON DC
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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
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation