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On the basis of the results obtained by Silver and Saunders  for the field radiated from an arbitrary slot in a perfectly conducting circular cylinder, expressions have been derived for the field radiated by a narrow helical slot, with an arbitrary aperture field distribution, in a circular cylinder. The cases of a standing wave and a progressing wave aperture field are given particular consideration. It has also been indicated how a finite width of the slot can be taken into consideration.doi:10.1109/tap.1959.1144776 fatcat:2bee47u5andzjkbz5gav6ilkby