It Is Often Necessary to Change the Physical Direction of Propagation

Multiple Choice

It is often necessary to change the physical direction of propagation or the wave's polarization in waveguides. What is the purpose of a twist section?

A) To produce shunting reactance across the guide
B) To change the plane of polarization of the wave
C) To change the physical direction of propagation
D) So low received power does no damage to the powerful transmitter output