| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device that has a narrower width of an umbrella element while maintaining similar reception performance, and has a narrower width of an upper part of an antenna case for an improved design.SOLUTION: The antenna device includes an antenna case 10, an antenna base 11, an umbrella element 13, an amplifier board 16 and a coil 14. The antenna case 10 has an open bottom to form a storage space therein. The antenna base 11 is fitted with the antenna case 10. The umbrella element 13 is arranged over the antenna base 11. The amplifier board 16, which has an amplifier for amplifying a signal received by the umbrella element 13, is mounted on the antenna base 11. The coil 14, which is inserted between an output end of the umbrella element 13 and an input end of the amplifier to cause the umbrella element to resonate with a predetermined frequency, is arranged substantially in the lateral middle of the umbrella element 13. |
