Discussion
What does Babinet's principle relate?
Answer: C
Babinet's principle, in its antenna form, states that a slot cut in a conducting sheet and the metal strip that would exactly fill it have complementary patterns, with the electric and magnetic fields interchanged. It gives the slot's impedance directly from the dipole's, and its polarisation is rotated ninety degrees. Reflector and lens equivalence, waveguide mode coupling and reciprocity are all different results. The principle is what makes slots analysable without any fresh calculation.
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