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What is an open ended waveguide used as?

  • A.A simple low gain aperture antenna and array element
  • B.A termination that absorbs any power reaching the end of the guide
  • C.A filter that passes only frequencies above the guide cutoff frequency
  • D.A transition from rectangular to circular waveguide in a feed system

Answer: A

The open mouth of a waveguide radiates directly, giving a broad pattern and a gain of a few decibels, and it is a common element in phased arrays because it is compact and rugged. The match is imperfect, which is why horns flare the aperture out gradually. It absorbs nothing, the cutoff behaviour belongs to the guide rather than to the opening, and mode transitions are made by tapered sections. It is the simplest aperture antenna there is and the starting point for the horn.

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