4.Return the receiver to its vertical position. Place the polarization grid between the transmitter and receiver, as shown below.
Rotate the polarization grid until it blocks all incoming microwaves, and note the orientation of the bars with respect to the incident electric field (i.e., either parallel or perpendicular). Explain what is happening. (This is not obvious. It has nothing to do with waves “squeezing between the bars”, but has much to do with the fact that the bars are conductors. You may wish to refer to your data in step 6 for a hint.)