1. [1] N. Stutzke and D. Filipovic, “Broadband two-arm dual-mode dual-polarized spiral antenna,” Proc. 2005 IEEE Antennas and Propagation Society International Symposium, Washington, D.C., USA, pp. 414-417, July 2005.
2. [2] Y. Li, Z. Zhang, W. Chen, Z. Feng, and M. F. Iskander, “A Dual-Polarization Slot Antenna Using a Compact CPW Feeding Structure,” IEEE Antennas Wireless Propag. Lett., vol. 9, pp. 191-194, 2010.
3. Investigation of circularly polarized loop antennas with a parasitic element for bandwidth enhancement
4. [4] M. Matsunaga, T. Matsuoka, and T. Matsunaga, “A Suggested Shape of Spirals for Expanding the Half-Power Beamwidths of UHF Band RFID's Planar Spiral Antennae,” Proc. 2008 International Symposium on Antennas and Propagation, Taipei, pp. 1422-1425, Oct. 2008.
5. [5] M. Matsunaga, K. Kakemizu, M. Candotti, and T. Matsunaga, “An Omni-Directional Multi-Polarization and Multi-Frequency Antenna,” Proc. 2011 IEEE Antennas and Propagation Society International Symposium, Spokane, USA, pp. 2765-2768, July 2011.