Minimum directivity of multiple-beam antennas
Abstract
It is pointed out that multiple-beam antennas are attractive for space communications. A coverage on earth adjustable from a narrow beam to a full earth coverage can be obtained by employing such antennas. A description is given of a design in which beams arranged in a triangular lattice are switched on individually to cover desired areas on earth. The minimum value of directivity occurs along the intersection of three adjacent beams. Attention is given to the calculation of the directivity. The directivities of the secondary patterns were obtained by using a computer program to calculate the radiation characteristics of a paraboloid with offset feeds.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- March 1975
- DOI:
- 10.1109/TAP.1975.1141031
- Bibcode:
- 1975ITAP...23..283D
- Keywords:
-
- Antenna Feeds;
- Antenna Radiation Patterns;
- Directivity;
- Optimization;
- Spacecraft Communication;
- Antenna Design;
- Beams (Radiation);
- Paraboloid Mirrors;
- Power Gain;
- Spacing;
- Space Communications, Spacecraft Communications, Command and Tracking