| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna which is small-sized and has reception characteristics more excellent than that of conventional antennas. SOLUTION: In transmission lines 4, a transmission line 4A parallel to a flat portion 2A and the flat portion of a reflector 2 form a first strip line. Furthermore, in the transmission lines 4, a transmission line 4A perpendicular to the flat portion 2A and a conductive plate 5A, 5B similarly form a second strip line. Both a radiation impedance of radiators 6A, 6B and a characteristic impedance of the transmission lines 4 are set, respectively, at 150Ωwhen the antenna's output terminal has a reference impedance of 75Ω. If the transmission line 4A has a midpoint serving as the output terminal of the antenna, this portion's input current is divided in two so that an impedance of half that of the strip line can be provided and a coaxial cable can directly be connected to the transmission lines 4. Therefore, a matcher or a mixer is not included in the antenna 1, so that matching and mixing losses can be prevented. COPYRIGHT: (C)2006,JPO&NCIPI
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