Bandwidth capabilities of array-fed parabolic cylinders
Abstract
The bandwidth of hybrid phased-array/reflector antennas, in which a large parabolic cylinder reflector is fed by a relatively small phased array, is investigated. Two types of array feeds are considered: one employs only phase-amplitude matching, the other employs amplitude and time-delay matching. In the case of phase-amplitude matching, the on-axis hybrid array/reflector designs are shown to have substantially higher bandwidth than pure phased arrays. A form of time-delay compensation is described which removes the bandwidth limitations of hybrid array/reflectors, but introduces interfering signals. This interference can be avoided by either locating the feed outside the caustic zone or by using off-axis array feeds.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- July 1982
- DOI:
- 10.1109/TAP.1982.1142877
- Bibcode:
- 1982ITAP...30..693S
- Keywords:
-
- Antenna Feeds;
- Bandwidth;
- Parabolic Reflectors;
- Phased Arrays;
- Time Lag;
- Amplitudes;
- Cylindrical Bodies;
- Electromagnetic Interference;
- Matching;
- Phase Shift;
- Signal Distortion;
- Communications and Radar