| Microsoft DirectX 9.0 |
Specifies the polarization type.
| Constant | Value | Description |
| BDA_POLARISATION_NOT_SET | -1 | Polarization not set. |
| BDA_POLARISATION_NOT_DEFINED | 0 | Polarization not defined. |
| BDA_POLARISATION_LINEAR_H | 1 | Linear horizontal polarization. |
| BDA_POLARISATION_LINEAR_V | 2 | Linear vertical polarization. |
| BDA_POLARISATION_CIRCULAR_L | 3 | Circular right polarization. |
| BDA_POLARISATION_CIRCULAR_R | 4 | Circular left polarization. |
| BDA_POLARISATION_MAX | 5 | Maximum polarization. |