Focal cloud

A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic.wikipedia
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Circle of confusion

circle of least confusioncircles of confusionacceptable circle of confusion
The effect is analogous to the circle of confusion in photography.

Feed horn

feedhornfeed antennafeedhorns
If the imperfections are formed in a way that the phase shifts of reflected waves, at a large portion of the dish, are near 180 degrees between them and the feed horn, this results in self-cancellation of the specific frequency.

Focus (optics)

focusfocal pointfocusing
A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic.

Lens

lensesconvex lensoptical lens
A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic.

Electrostatic lens

ion opticselectrostaticlens
A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic.

Parabolic antenna

dish antennaparabolicparabolic dish antenna
This includes parabolic antennas and lens-type reflective antennas of all kinds.

Optical resolution

resolutionresolvedresolve
The diameter of the focal cloud determines the maximum resolution of the optical system.

Phase (waves)

phasephase shiftout of phase
If the imperfections are formed in a way that the phase shifts of reflected waves, at a large portion of the dish, are near 180 degrees between them and the feed horn, this results in self-cancellation of the specific frequency.