Discussion
What is an E-plane sectoral horn?
Answer: A
An E-plane sectoral horn opens out in the direction of the electric field and keeps the guide dimension in the other plane, so it narrows the beam in the E-plane only. The H-plane version does the opposite, and flaring both gives the pyramidal horn. An unflared guide is simply an open ended waveguide. Sectoral horns are used where a fan beam is wanted, narrow in one plane and broad in the other, which suits many radar and landing aid applications directly.
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