| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna capable of preventing occurrence of a communication disabled region in a communication target region.SOLUTION: An antenna comprises: a first antenna part 3 composed of a leakage coaxial cable which includes a linear central conductor, an insulator covering the central conductor, an external conductor which covers the central conductor so as to sandwich the insulator between the external and central conductors and on which a plurality of slots are installed at a predetermined pitch along the axis direction of the central conductor, and a sheath covering the outer periphery of the external conductor, and extends in the axial direction from one end at which a signal is supplied to the other end; and a second antenna part 5 whose one end is connected to the central conductor and the other end is connected to the external conductor at a terminal end part. A radiation wave is radiated from the plurality of slots in a direction inclined to the start end part side with respect to the normal line of the leakage coaxial cable. Radiation having polarization which is the same as that of the radiation wave is performed in the normal direction from the second antenna part 5. |
