Circular polarization of microwaves: With reflector and grids.

Circular polarization of microwaves: With reflector and grids. In this demo, microwaves from a transmitter are broken up into equal vertical and horizontal polarized components. These are then added together so that they are 90 deg out of phase: a criteria for circular polarization. The 3 cm. microwave transmitter horn produces polarized microwaves with the electric field in the vertical direction. The 3 cm. microwave receiver is designed to sense these polarized microwaves, and to emit an audible tone from its speaker. See figures 1, 2, and 3. The transmitter horn is rotated 45 deg . Upon hitting the first vertical-wire polarizing grid, the E field is broken up into two equal components. The horizontal component reflects off the grid, and then off the aluminum plate, then off the second polarizing grid and into the receiver horn. The vertical component is transmitted through the first and second grid and into the receiver horn. Moving the metal plate carefully back and forth, allows the horizontal wave to be adjusted to be 90 deg out of phase with the vertical wave, creating circular polarization. No matter how the receiver is rotated, microwaves are detected.