DIPOLE ANTENNA HAVING REFLECTOR

PROBLEM TO BE SOLVED: To provide a dipole antenna having a reflector for substantially obtaining nondirectivity, even when it has a multi-surface arrangement of 5 surfaces or more, while not changing the basic configuration of a dipole antenna suitable to a four-surface arrangement, as much as possible. SOLUTION: The dipole antenna comprises a power supply circuit (power supply trap 20), a dipole element 10 and a power supply path 30 for connecting the power supply circuit and the dipole element 10. A length of the power supply path 30 is adjusted so as to secure a phase difference between emission from the dipole element 10 and emission from the power supply circuit, and the half width of horizontal plane directivity is made 90° or smaller in the electric field half width. COPYRIGHT: (C)2004,JPO