1. [1] K.R. Carver, “A cavity-fed concentric ring phased array of helices for use in radio astronomy,” Ph.D. dissertation, The Ohio State Univ., 1967.
2. [2] M. Haneishi and S. Saito, “Radiation properties of microstrip array antenna fed by radial line,” Antennas Propag. Soc. Symp. Dig., vol.2, pp.588-591, 1991. 10.1109/aps.1991.174908
3. [3] H. Nakano, H. Takeda, Y. Kitamura, H. Mimaki, and J. Yamauchi, “Low-profile helical array antenna fed from a radial waveguide,” IEEE Trans. Antennas Propag., vol.40, no.3, pp.279-284, March 1992. 10.1109/8.135470
4. [4] H. Nakano, S. Okuzawa, K. Ohishi, H. Mimaki, and J. Yamauchi, “A curl antenna,” IEEE Trans. Antennas Propag., vol.41, no.11, pp.1570-1575, Nov. 1993. 10.1109/8.267357
5. [5] T. Watanabe, M. Ogawa, K. Nishikawa, T. Harada, E. Teramoto, and M. Morita, “Mobile antenna system for direct broadcasting satellite,” IEEE Antennas Propag. Soc. Int. Symp. Dig., vol.1, pp.70-73, 1996. 10.1109/aps.1996.549544