Curl and spiral antennas without horizontal straight sections

This paper is a sequel to the previous paper (K. Hirose et al., 2004), and demonstrates the effects of the HS sections on the radiation characteristics. For this, the method of moments is applied to the analyses of curl and spiral antennas whose HS sections are removed. Using the analyzed current distributions, the radiation characteristics are calculated and compared with those of curl and spiral antennas with HS sections.