A conformal spiral array antenna radiating an omnidirectional circularly-polarized wave

摘要

A conformal spiral antenna above a finite-length conducting cylinder has been numerically analyzed using the method of moments (MoM). In this paper, spiral elements are arrayed above a conducting cylinder. The radiation characteristics of the array are evaluated with emphasis on the radiation patterns. The formation of an omnidirectional radiation pattern is discussed. The mutual coupling among spiral elements is investigated. The radiation patterns calculated by the MoM are compared with those calculated by the pattern multiplication method (PMM). The limitations of the PMM calculation are revealed.