| 摘要 |
In a portable telephone 10, a first housing 11 and a second housing 12 are connected to each other by hinge sections 13a and 13b which makes the first housing 11 and the second housing 12 rotatable about the long-side direction of the housings 11 and 12. A metal frame 14 is provided at a peripheral section of the first housing 11, and a display section 15 is provided at the central section of the first housing 11. A metal, such as, for example, a magnesium alloy and SUS, which is highly conductive, light in weight, and high in mechanical strength, is used for the metal frame 14. When such kind of metal is used, the mechanical strength can be secured even in a thin shape, and the metal frame 14 can also be operated as an antenna element. On the other hand, in the second housing 12, a circuit board 16 to which a baseband circuit, a radio circuit, and the like, are mounted, a first feeding section 17 which supplies electric power to the metal frame 14, and a draw-out rod antenna 18 which can be drawn out from and housed in the housing are supplied with electric power by the second feeding section 19. Further, a key section (input section) 20 with which input operations of a telephone number, characters, and the like, are performed is provided at the second housing 12. Further, a cellular antenna 21 which performs communication with a base station is also incorporated in the second housing 12. The rod antenna 18 can be drawn out in the direction substantially in parallel with the rotation axis of the above described hinge. On the housing end side opposite to the first feeding section 17 and the second feeding section 19 in the X-axis direction, the ground in the first housing 11 and the ground of the circuit board 16 are connected to each other by a flexible ground conductor 22 via the hinge section 13b. The ground is provided over substantially the whole rear surface of the circuit board 16. |
