1. Hui, H. T., E. K. N. Yung, C. L. Law, Y. S. Koh, and W. L. Koh, "Design of a small and low-profile 2×2 hemispherical helical antenna array for mobile satellite communications," IEEE Transactions on Antennas and Propagation, Vol. 52, No. 1, 346-348, 2004.
doi:10.1109/TAP.2003.822410
2. Li, X.-Q., Q.-X. Liu, X.-J. Wu, L. Zhao, J.-Q. Zhang, and Z.-Q. Zhang, "A GW level high-power radial line helical array antenna," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 9, 2943-2948, 2008.
doi:10.1109/TAP.2008.928781
3. Hassan, S. I. S., M. F. Ah, and A. R. Arief, "Four beams helical antenna array for mobile satellite application," 2004 RF and Microwave Conference, 53-55, Subang, Selangor, Malaysia, 2004.
4. Yang, F., P. Zhang, C.-J. Guo, and J.-D. Xu, "Axial-mode elliptical helical antenna with variable pitch angle," Electronics Letters, Vol. 44, No. 19, 1103-1104, 2008.
doi:10.1049/el:20081818
5. Sun, D. Y., "Design of reflector antenna fed by backfire helix," Spacecraft Engineering, Vol. 17, No. 2, 59-62, 2008 (in Chinese).