| 摘要 |
A mobile radio apparatus that has a reduced thickness and exhibits a high antenna radiation efficiency without any occurrence of communication troubles even in various usage conditions of the folding mobile radio apparatus. In the mobile radio apparatus, first and second cases are joined by use of a hinge part so that the mobile radio apparatus has a mechanism for allowing it to be freely folded and opened. The first case includes plate-shaped conductors (104,106,107), and the plate-shaped conductors (106,107) are spaced from the plate-shaped conductor (104). A gravity sensor (122) is provided for determining the slope angle of the mobile radio apparatus by which to determine the usage condition of the mobile radio apparatus. A control part (123) controls, in accordance with the slope angle, a high frequency switch (112), thereby selectively supplying an electric power to the plate-shaped conductors (106,107). During communication, the plate-shaped conductor (104) is always supplied with the electric power in a phase different from the phase in which the plate-shaped conductor (106) or plate-shaped conductor (107) is supplied with the electric power.
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