Abstract
The geometric optics condition for zero crosspolarization in offset Cassegrain antennas is discussed. It is shown that with a feed having perfect pattern symmetry the crosspolar performance of the offset Cassegrain is limited by diffraction. As a result, minimum crosspolarization is only achieved at the geometric optics condition when the subreflector diameter is at least 40 wavelengths. 9 refs.
| Original language | English |
|---|---|
| Pages (from-to) | 585-586 |
| Number of pages | 2 |
| Journal | Electronics Letters |
| Volume | 17 |
| Issue number | 17 |
| Publication status | Published - 1 Jan 1981 |