| 摘要 |
A plane antenna system (1) which is stuck to mobile communication equipment (13) so that the system (1) can be used in a state where the system (1) is touched by the hand of a man is constituted by forming a receiving circuit (7) having three kinds of conductive layers composed of a pair of U-shaped conductive layers (3) which are arranged at an interval and have symmetrical shapes, a pair of conductive layers (5) which are arranged at distances from and on both sides of the layers (3) and have symmetrical shapes and bent sections (4) at their ends, and a conductive layer (6) which is positioned above the conductive layers (3) at distance from the layers (5 and 3) on a flexible insulating substrate (2) and coating the circuit (7) with an insulator (8) which is formed by the potting, etc., of insulating ink so that, when a man puts his hand on the insulator (8), a tuning capacitor can be formed among the hand, the insulator (8), and the circuit (7). Since the tuning capacitor is formed among the hand of a man, the insulator (8), and the circuit (7) when the man puts the hand on the insulator (8), noise can be reduced during speech and, even when the efficiency of radio waves is bad at the time of using the equipment (13) in an electric field having a low intensity, such troubles that the speech is interrupted by noise, speech is discontinued, and so on, can be eliminated. In addition, the antenna system (1) can be constituted in a small-sized, light, and thin flexible body so that the system (1) can be stuck to the rear surface, etc., of a portable telephone set.
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