Editing Electronic counter-countermeasure (section)

===Polarization===
[[Polarization (waves)|Polarization]] can be used to filter out unwanted signals, such as jamming. If a jammer and receiver do not have the same polarization, the jamming signal will incur a loss that reduces its effectiveness. The four basic polarizations are linear horizontal, linear vertical, right-hand circular, and left-hand circular.  The signal loss inherent in a cross polarized (transmitter different from receiver) pair is 3 [[decibels|dB]] for dissimilar types, and 17&nbsp;dB for opposites.

Aside from power loss to the jammer, radar receivers can also benefit from using two or more antennas of differing polarization and comparing the signals received on each.  This effect can effectively eliminate all jamming of the wrong polarization, although enough jamming may still obscure the actual signal.