Discussion
What is a slot antenna cut in a large conducting sheet equivalent to?
Answer: C
By Babinet's principle the slot and the metal strip that would fill it are complementary, so the slot radiates the dipole pattern with electric and magnetic fields exchanged and the polarisation rotated by ninety degrees. Its impedance follows from the dipole's through the duality relation. Loops, waveguide apertures and monopoles are all different radiators with their own analyses. The value of the duality is that no fresh electromagnetic calculation is needed for the slot at all.
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