Range-testing a conical logarithmic spiral antenna for a dual-polarized riometer
Abstract
In the experiments described in the present paper, the off-axis axial ratios and the radiation patterns of conical log spiral antenna models were studied at a single frequency with the object of obtaining a circularly polarized antenna of small physical height, for use in a decametric dual-polarized riometer. The experimental data and theoretical analysis on the far-zone field directional patterns of nonplanar aperture surfaces point to a significant role of the surface curvature in the design of microwave antennas. It is seen that the idea of providing curvature to an aperture-type antenna could be useful in designing the primary feed for passive antenna reflectors in the microwave frequency band. The curvatures studied were in the form of parabolic cylinders, but they could equally well be hyperbolic, elliptical, or any regular smooth surfaces.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- November 1978
- DOI:
- 10.1109/TAP.1978.1141959
- Bibcode:
- 1978ITAP...26..870W
- Keywords:
-
- Antenna Radiation Patterns;
- Galactic Radiation;
- Log Spiral Antennas;
- Riometers;
- Backlobes;
- Circular Polarization;
- Dipole Antennas;
- Instrument Orientation;
- Pitch (Inclination);
- Range;
- Sidelobes;
- Instrumentation and Photography