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A dielectric slab is used as a radome in front of an antenna. To avoid reflection its thickness should be

  • A.as small as the mechanical strength allows, whatever the wavelength
  • B.a half wavelength in the material, or a multiple of it
  • C.a quarter wavelength in the material
  • D.a half wavelength in free space

Answer: B

A half-wave slab transforms the impedance behind it into itself, so the antenna sees free space and nothing is reflected. A quarter-wave slab of the geometric mean impedance is the matching case for two different media, which is a different problem.

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