Abstract
A knob placed at the vertex of a subreflector to reduce subreflector mismatch in a shaped Cassegrain antenna can significantly degrade the radiation pattern and reduce efficiency. A practical procedure is described to lessen these effects. Best results are obtained using a cosine-squared-shaped knob, keeping a low knob height and knob base within the feed blockage region. The importance of simultaneously optimising for return loss, antenna efficiency and sidelobe level is emphasised.
| Original language | English |
|---|---|
| Pages (from-to) | 781-782 |
| Number of pages | 2 |
| Journal | Electronics Letters |
| Volume | 32 |
| Issue number | 9 |
| Publication status | Published - 25 Apr 1996 |
| Externally published | Yes |
Keywords
- Antenna feeds
- Antenna radiation patterns
- Antennas