Publication: IEICE TRANSACTIONS on Communications Publication Date: 2011/05/01 Vol. E94-BNo. 5pp. 1276-1279 Type of Manuscript: Special Section LETTER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies) Category: Antennas Keyword: normal-mode helical antenna, self-resonant structure, capacitive reactance, inductive reactance,