| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-frequency shared antenna capable of providing a resonance circuit in an antenna body of a freely expandable/contractable rod antenna while applied to demand of downsizing, diameter reduction and space saving of an accommodation space or the like and simultaneously capable of ensuring flexibility of the antenna body of the freely expandable/contractable rod antenna and sufficient elasticity.SOLUTION: A multi-frequency shared antenna 1 comprises: a freely expandable/contractable rod-shaped antenna element section 2 and a holding section 3 for holding the antenna element section 2 in a flexible manner. The holding section 3 includes: a substantially tubular antenna element conduction part which is provided to be conducted with the antenna element section 2; a substantially tubular feeding conduction part which is provided to be conducted with a feeding part; an insulation tube 35 which is substantially packaged within the feeding conduction part and interposed between the antenna element conduction part and the feeding conduction part; and a coil 36 which is disposed within the insulation tube 35 while matching an axial line direction with the insulation tube 35, conductively couples the upper end portion thereof to the antenna element conduction part and conductively couples the lower end portion thereof to the feeding conduction part. |
