80 Appendix
NN47250-503 (323847-C Version 02.01)
With linearly polarized antennas, the polarization of each antenna must be of the same orientation to achieve
maximum energy transfer between the two antennas. If the two linearly polarized antennas are not identically
oriented, there will be a reduction in energy transfer due to polarization mismatch. The table below provides a
summary of polarization mismatch loss between two linearly polarized antennas that do not have the same
angular orientation.
The following table provides a summary of the polarization mismatch between a linearly polarized and a
circularly polarized wave as a function of the circularly polarized wave's axial ratio. It is assumed that the
circularly polarized wave's field components are orthogonal.
Table 16: Polarization mismatch
Orientation angle Polarization mismatch (dB)
0.0 (aligned) 0.00
15.0 0.30
30.0 1.25
45.0 3.01
60.0 6.02
75.0 11.74
90.0 (orthogonal) infinite
Table 17: Polarization mismatch between linear and circular
polarized waves
Axial Ratio
Minimum Polarization
Loss [dB]
Maximum Polarization
Loss [dB]
0.00 3.01 3.01
0.25 2.89 3.14
0.50 2.77 3.27
0.75 2.65 3.40
1.00 2.54 6.54
1.50 2.33 3.83
2.00 2.12 4.12
3.00 1.77 4.77
4.00 1.46 5.46
5.00 1.19 6.19
10.00 0.41 10.41
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