Dual-band dichroic polarizer and system including same

摘要

A dual-band dichroic polarizer is provided for converting linearly polarized electromagnetic energy within distinct frequency bands into oppositely polarized circularly polarized electromagnetic energy. The polarizer includes an array of unit cells distributed across a sheet, wherein the unit cells each include a stack of one or more resonant structures, the stack configured to introduce a phase differential of approximately +90° to linearly polarized electromagnetic energy within a first distinct frequency band that is incident upon and passes through the sheet, and configured to introduce a phase differential of approximately −90° to linearly polarized electromagnetic energy within a second distinct frequency band, separate from the first distinct frequency band, that is incident upon and passes through the sheet, a linear polarization of the electromagnetic energy in the first distinct frequency band and a linear polarization of the electromagnetic energy in the second distinct frequency band being the same.

主权项

1. A dual-band dichroic polarizer for converting linearly polarized electromagnetic energy within distinct frequency bands into oppositely polarized circularly polarized electromagnetic energy, comprising:
an array of unit cells distributed across a sheet; wherein the unit cells each include at least one of a resonant structure or a plurality of resonant structures stacked one over the other, the at least one resonant structure or stacked resonant structures configured to introduce a phase differential of approximately +90° to linearly polarized electromagnetic energy within a first distinct frequency band that is incident upon and passes through the sheet, and configured to introduce a phase differential of approximately −90° to linearly polarized electromagnetic energy within a second distinct frequency band, separate from the first distinct frequency band, that is incident upon and passes through the sheet, a linear polarization of the electromagnetic energy in the first distinct frequency band and a linear polarization of the electromagnetic energy in the second distinct frequency band being the same, wherein constituent parts of each resonant structure include at least two different patches or apertures, and at least one of the constituent parts comprises complementary corner structures arranged in each corner of the unit cell, the complementary corner structures separate and distinct from the other of the at least two different patches or apertures, andwherein at least one of the corner structures is immediately adjacent to a corner structure of an adjacent unit cell.