Patent ID: 8248322
Filing Date: 2012-08-21
Classification: H01Q

Abstract:
1. An antenna system comprising: a linearly polarized horn antenna with a direction of linear polarization, the antenna having an axis; a rotatable parallel plate polarizer disposed on the axis inside the linearly polarized horn antenna, the rotatable parallel plate polarizer having a phase advance orientation orthogonal to the axis; and a rotatable anisotropic dielectric polarizer disposed on the axis inside the linearly polarized horn antenna, the rotatable anisotropic dielectric polarizer having a phase advance orientation orthogonal to the axis, wherein, when the phase advance orientation of the rotatable parallel plate polarizer is at an angle of about 45° or about 135° with respect to the direction of linear polarization, and the phase advance orientation of the rotatable anisotropic dielectric polarizer is at an angle of about 45° or about 135° with respect to the direction of linear polarization, the rotatable parallel plate polarizer and the rotatable anisotropic dielectric polarizer have a combined differential phase shift for a first frequency f