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cent1metr1c aer1al requ1rements
polar d1agram theory
types of aer1al
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Abbe sine condition aerial system amplitude distribution aperture dimension aperture distribution aperture horn axis beam-width centimetric circular polarization construction cosec pattern described dielectric lens difficulties dipole direction displaced double-curvature edge slot effect elevation equiphase feeder field strength flared focal length Fourier method free space give H plane impedance band-width incremental conductance lenses line source linear array longitudinal polarization main beam matched maximum measured metal plate metal-plate lens mismatch mode non-resonant array normal obtained optical method parabolic cylinder paraboloid parallel plates particular perpendicular phase centre phase change phase velocity point source polar diagram polyrod power gain produce propagated radiation pattern radiator spacing rays rear feed reflector reflexion refractive refractive index resonant array rotated satisfactory scanner scanning secondary radiator shaped patterns shown in fig side-lobes simple Snell's law spherical aberration standing wave ratio surface tapered thin cheese tion tolerances unipole usually vector wave-guide wave-length wide width