| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact antenna device which has four direction directivity and is large in F/B ratio. SOLUTION: The antenna device radiates or receives radiowaves in/from different four directions. A linear antenna 10 comprises a first wire line 11 and a second wire line 12 that is parallel to the first wire line. Moreover, the linear antenna 10 has a power feeding/receiving point 13 provided at proximal portions of the first wire line and second wire line, and comprises a terminal resistance 14 that is provided at distal end portions of the first wire line and second wire line. With a vector heading for the terminal resistance from the power feeding/receiving point as an orientation vector of the antenna, four antennas 10, 20, 30, and 40 are placed so that a first pair of antennas facing each other are parallel to each other with the orientation vector facing in the opposite direction, a second pair of antennas facing each other are parallel to each other with the orientation vector in the opposite direction, and directions of the orientation vectors of the first pair of antennas are not parallel to the second pair of antennas. COPYRIGHT: (C)2011,JPO&INPIT |
