co-polarization

When i read papers about the antennas , I often see that the co-polarization and cross-polariazation in the same one radiation pattern plotting . SO I can't know it ! Generally ,we plot E-plane radiation pattern with "theta " changing and H-plane radiation pattern with "phi" changing ,but what does the co-po and cross-po mean in one plotting?who can tell me ? Thanks a lot

Hi,

You can find info on your question at URLs like
http://www.ethertronics.com/assets_f...%200120031.pdf on Page 4:

""Co-polarization: Co-polarization is the polarization in which the antenna is intended to radiate.
Cross-polarization: Cross-polarization discrimination is the measure of discrimination to oppositely polarized electromagnetic waves (e.g. the discrimination that a vertically polarized antenna has to horizontally polarized radio waves or the polarization orthogonal to a specified reference polarization). When plotted along with the principal plane pattern of the antenna on a relative dB scale, cross-polarization discrimination is simply the difference between the co-polarized level and the cross-polarized level in any given direction.""

See also
http://www.utexas.edu/research/mopro.../chapter06.pdf
http://cellphones-accessories.com/pcsantenna.html

rgds, unkarc