📡 Dish Antenna: Gain, Beamwidth, Ruze Surface Loss and Pointing Error (2D)

Cross-section of a parabolic dish that focuses a plane wave onto its feed, next to the beam pattern it forms on the sky. Set the dish diameter, the frequency, the aperture efficiency, the surface error, the pointing error and the range and power of a spacecraft, and see the gain, the half-power beamwidth, the loss from a rough surface, the loss from mispointing and the signal to noise density received. The aperture directivity, the beamwidth, the Ruze loss and the pointing loss are checked numerically, with four in-page numerical checks.