A low-profile circularly polarized medium gain antenna is presented. This traveling-wave antenna consists of a conducting wire or strip placed above a ground plane and following the contour of a cross with four or more branches and a diameter of around 1.5 wavelengths. The length of the wire is typically 5-20 wavelengths over one or more turns. The antenna is fed from a coaxial input and terminated in a load. Multiple arm configurations are also introduced. The antenna and its principles of operation are described. Computer modeling of the antenna is followed by the optimization of a few configurations for which design data and typical performances are given. Experimental results on both one- and two-turn versions agree well with predictions and confirm the practical value of this novel antenna configuration.>
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