To obtain a small-sized antenna system which is suitable to a communication system needing plural communication bands by providing a parasitic conductor that is made to operate as an antenna which is alienated from an antenna block, is arranged at a position where it faces the radiation conductor of the antenna block, is energized by electromagnetic coupling with the antenna block and has plural resonance points.
A parasitic conductor film 70 is made of a loop-shaped band body, and a part compressed in the middle is formed by such a manner that a band forming the parasitic conductor film 70 is bent inward in parts of left and right sides which face to each other. In such a case, the parasitic conductor film 70 is formed by etching a thin copper film formed on a thin Teflon film. The film 70 is made to operate as an antenna which is separated from an antenna block 10, is arranged at an upper part of the antenna block 10, is excited by electromagnetic coupling with the antenna block 10 and has two resonance points.
SAKAI NOBUTOMO
HIROSE EIICHIRO
YADOKORO HIROAKI
MATSUSHIMA HIDENAO
UCHIDA KOJI
NISHI NOBUAKI
ARAI HIROYUKI