Use of the minimum crosspolarization modes through rain to reduce the rain crosspolarization in communication systems
Abstract
It is shown that use of two orthogonal linear polarizations oriented at an optimal angle with respect to the conventional vertical and horizontal directions can reduce the rain crosspolarization to its minimum. This is actually the characteristic mode of the raindrop medium in which the transmitted signal will not change its polarization. Thus, no crosspolarization can result. Instead of finding the characteristic modes, this situation simply suggests the use of two crosscoupling networks introducing additional crosspolarization with controlled amplitude and phase before transmitting and after receiving to cancel out the crosspolarization by rain. The network applied before transmitting to the satellite is to compensate for the uplink rain effect, and that applied after receiving is to compensate for the downlink rain effect.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- October 1977
- Bibcode:
- 1977PhDT........70L
- Keywords:
-
- Communication;
- Polarization Characteristics;
- Rain;
- Coupling;
- Linearity;
- Networks;
- Communications and Radar