| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device in which the width of an umbrella element can be narrowed while maintaining the reception performance equally, and the design can be improved by narrowing the width at the upper part of an antenna case.SOLUTION: The antenna device consists of an antenna case 10, an antenna base 11, an element holder 12, an umbrella element 13, an amplifier substrate 16, and a coil 14. The antenna case 10 is fitted to the antenna base 11. The element holder 12 is insulating and provided to stand on the antenna base 11. The umbrella element 13 is installed above the element holder 12 so as to be positioned substantially at the center of right and left. The coil 14 causes the umbrella element, inserted between the umbrella element 13 and the input end of an amplifier, to resonate at a predetermined frequency, and is secured to the element holder. |
