Polarization loss and isolation

Polarization loss and isolation

To receive the greatest possible energy, transmitting and receiving antennas must be of the same polarization, namely, V-polarized waves must be received by V-polarized receiver antennas, and the same goes for other types. If  he polarization direction of the radio wave is different from that of the receiver antenna, polarization loss results.

To summarize polarization loss, polarizations can be put into two cases: circular polarization and the rest linear polarization.

The linear-circular loss is 3dB, namely, half the energy is lost. The circular-circular or mismatching case, that is, the left and right circular working together, results no energy received; and the linear-linear perpendicular case, results no energy received. Such cases are called isolation of polarization.

Isolation is defined as the proportion of the signal fed to one polarization to that appearing in another polarization.