INVESTIGATIONS ON THE DIRECTIVITY OF CIRCULAR ANTENNA ARRAYS IN COMPARISON WITH THE BEAMWIDTH OF PARABOLIC REFLECTORS IN THE DECIMETER AND CENTIMETER WAVE BAND.
WAECHTLER (MAXIMILIAN) HAMBURG (GERMANY)
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Those questions of the research on electronically steerable antennas and circular arrays are discussed, which refer to the problem of suitable antenna arrangements. The required fixed antenna arrangement which has to be a circular array, can only be equivalent with a rotatable parabolic reflector, if the pattern of the circular array has the same directional sharpness and reduction of side lobes as that of a usual parabolic reflector width of main beam at half-power point circ. 2 degrees and side-lobe level down from peak at least 28 db. The research under this contact results in the data for such a circular array. The investigations required for finding the most suitable dimensions of the antenna system and the necessary amplitude tapering of its aerials, were carried out after considerations about the influence of the laws of tapering on the properties of the directional pattern of rotatable arrays. For these rotatable antenna systems the investigations were made for arrays with discrete aerials as well as for arrays with continuously distributed amplitudes. Because of the required directional sharpness narrow width of main beam all antenna systems considered, necessarily have large dimensions and thus a high number of aerials. This fact causes considerable work for the numerical calculation of the patterns. Author
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