| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform non-contact communication of a high speed and a wide band while following the regulation of limiting electric field and magnetic field strength to be radiated to the outside and suppressing the influence of jamming. <P>SOLUTION: Since the antenna device is structured such that two loop antennas with a magnetic body sheet are vertically symmetrically disposed to a conductor surface, a communication antenna and a canceling antenna have the mutually same reception characteristics to radio waves made incident from the horizontal direction of an antenna surface. Then, since both antennas have the antenna loops in directions opposite to each other, the antenna surface horizontal direction components of the incident radio waves are canceled with each other when reception signals are processed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
