Self-complementary antenna: Difference between revisions

The [[log-periodic antenna]] is a modified, folded up, square self-complementary antenna with log-periodic shape, and the original structure before its modification has a typical self-complementary shape. The log-periodic shape does not provide the broadband property for antennas.<ref>Y. Mushiake, “Constant-impedance antennas," ''J. IECE Japan'', 48, 4, pp. 580-584, April 1965</ref> This fact is experimentally proven.<ref>http://www.sm.rim.or.jp/~ymushiak/sub.non-const.htm#####</ref> It is also evident from the IEEE definition of “Log-Periodic Antenna”.<ref>“''Log-periodic antenna'' Any one of a class of antennas having a structural geometry such that its impedance and radiation characteristics repeat periodically as the logarithm of frequency.”(see ''The new IEEE Standard Dictionary of Electrical and Electronics Terms'',1993).</ref> The "Log-Periodic Dipole Array"<ref>D. E. Isbell, “Log-periodic dipole arrays” IRE Trans. Antennas Propag., vol. AP-8, pp.260-267, May 1960.</ref> or "Log-Periodic Dipole Antenna"<ref>R. L. Carrel, “The design of log-periodic dipole antennas,” ''IRE Intl. Conv. Rec., pt.Ⅰ'', pp. 61-75, 1961</ref> (LPDA), is a practically modified self-complementary antenna. LPDA has [[transposed excitation]]<ref>{{cite web|url=http://www.sm.rim.or.jp/~ymushiak/sub.4.htm |title=Y. Mushiake, &#39;''Self-Complementary Antennas―Principle of Self-Complementarity for Constant Impedance―,''&#39; 139 pages, Springer-Verlag London Ltd., London,1996.pp.75-80 |publisher=Sm.rim.or.jp |date= |accessdate=20152019-1012-2413}}</ref> for the dipole array resulted from folding up<ref>http://www.sm.rim.or.jp/~ymushiak/sub.4.htm#%%#</ref> the antenna structure to obtain unidirectional radiation, that is inevitable outcome of the modification.