!full! — Waveguide Antennas
[ G = \frac4\pi A\lambda^2 \eta_a ] where (A) = aperture area, (\eta_a) ≈ 0.5–0.7 for typical horns.
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[ G = \frac4\pi A\lambda^2 \eta_a ] where (A) = aperture area, (\eta_a) ≈ 0.5–0.7 for typical horns.