Range distance requirements for measuring low and ultralow sidelobe antenna patterns
Abstract
Consideration of the effects of quadratic phase errors resulting from finite length pattern ranges on the measurement of low and ultralow sidelobe antennas shows the 2D-squared/wavelength rule distance to be inadequate for the measurement of sidelobe patterns if the near-in sidelobes are to be preserved within errors of less than 1 dB. A relationship between sidelobe errors and range distances is derived from calculated patterns for several one-dimensional amplitude distributions having various quadratic phase errors. This relationship is plotted in terms of highest sidelobe change versus range distances, showing range distance requirements for low sidelobe patterns and measurement tolerances. It is found that the effects of quadratic phase error on near-in pattern sidelobes diminishes rapidly with angular distance from the main beam.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- September 1982
- DOI:
- 10.1109/TAP.1982.1142916
- Bibcode:
- 1982ITAP...30..956H
- Keywords:
-
- Antenna Radiation Patterns;
- Error Analysis;
- Phase Error;
- Radio Range;
- Sidelobe Reduction;
- Signal Measurement;
- Distance;
- Electromagnetic Measurement;
- Far Fields;
- Tolerances (Mechanics);
- Communications and Radar