Circularly Polarized Log Periodic Dipole Antennas
Keywords:Broadband, LPDA antennas
This Modified Self-complementary LPDA  has a second array of dipoles so arranged that each dipole of the second array has a quarter-wavelength phase difference from that of the corresponding dipole of the standard LPDA array for the given radiation field. The cross-element LPDA does not need a broadband 90-degree hybrid junction to produce circular polarization.
Y. Mushiake, Self-complementary Antennas. Springer, UK, 1996.
R. Carrel, “The Design of Log-Periodic Dipole Antennas,” Antenna Lab, University of Illinois, Urbana, Tech. Rep. 52, Sept. 1961.
R. S. Elliott, Antenna Theory and Design. Prentice-Hall, Inc., pp. 382- 384, 1981.
R. F. Harrington, Field Computation by Moment Methods. Macmillan Co., Ltd. N.Y., 1968.