| 摘要 |
PROBLEM TO BE SOLVED: To receive radio waves arriving from different directions by changing directional characteristics with simple constitution. SOLUTION: Dipole antenna elements 4 and 6 having a lengthλ/4 are disposed in a line, and a feed unit 8 feeds electricity to between nearby ends of the dipole antennas 4 and 6. Extension elements 10a and 10b having a lengthλ/4 are disposed in a line outside the dipole antenna elements 4, and extension elements 14a and 14b having a lengthλ/4 are disposed in a line outside the dipole antenna element 6. Switches 12a, 12b, 16a, 16b are provided between the extension elements 10a and 10b, between the dipole antenna element 4 and extension element 10a, between the extension elements 13a and 14b, and between the dipole antenna element 6 and extension element 14a respectively. COPYRIGHT: (C)2009,JPO&INPIT
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