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2. G. A. Deschamps, “Impedance properties of complementary multiterminal planar structures,” IRE Trans. Antennas Propag., vol. AP-7, pp. S371 — S378, December 1959.
3. R. H. DuHamel and D. E. Isbell, “Broadband logarithmically periodic antenna structure,” IRE Natl. Cony. Rec., pt. I, pp. 119–128, 1957.
4. D. E. Isbell, “Nonplanar logarithmically periodic antenna structures,” Tech. Rep. 30, Univ. of Illinois Antenna Lab, Contract AF33(616)-3220, February 1958.
5. R. H. DuHamel and F. R. Ore, “Logarithmically periodic antenna design,” Tech. Rep. CTR-198, Collins Radio Co., Cedar Rapids, Iowa, March 1958.