| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of easily and surely attenuating a leakage wave (an interference wave) reaching a reception antenna from a transmission antenna and ensuring isolation even if the frequency of a radio wave (the interference wave) transmitted from the transmission antenna or the distance between the transmission and reception antennas is different. <P>SOLUTION: An antenna device A is composed of a reception antenna 2, a transmission antenna 1, and a reflection member 3 which transmits a main radio wave and reflects part of a leakage wave leaked from the transmission antenna 1 toward the reception antenna. The reflection member 3 is disposed such that a reflection wave S2 reflecting part of the leakage wave and reaching the reception antenna 2 reaches the reception antenna 2 with a phase shifted with respect to a direct wave S1 of the leakage wave directly reaching the reception antenna 2. Interference is generated by the phase shift between the direct wave S1 and the reflection wave S2, thereby attenuating an interference wave (the direct wave S1) from the transmission antenna 1 to the reception antenna. <P>COPYRIGHT: (C)2012,JPO&INPIT |
