| 摘要 |
PROBLEM TO BE SOLVED: To receive radio waves without lowering the sensitivity, even when an antenna is not used and contracted and to discriminate whether a portable telephone set belongs to its owner with only one glance by providing an antenna cap on the top tip of an antenna body that is extendible and contractible and providing a series resonance circuit which consists of capacitive resistance and a coil. SOLUTION: An antenna cap 10, whose upper part is made of transparent or translucent insulating material, is provide on the top tip of an antenna body 7 of a portable telephone set. A serial resonance circuit 13, which consists of capacitive resistance 11 and a coil 12 and an identification body 14 of the insulating material to which various colors and designs which are risible from the outside are added on top of the circuit 13, are contained in the cap 10. This enables receiving radio waves through the circuit 13, even when the body 7 is contracted and to confirm whether a portable telephone set belongs to its owner with the body 14. |
