ANTENNA DEVICE AND PORTABLE RADIO DEVICE

摘要

An antenna device is provided with a spiral first antenna and linear second antenna which slides in the first antenna in the axial direction. When this antenna device is housed, the upper end of the conductor portion of the second antenna is passed through the first antenna and placed apart from the lower end of the first antenna and, when the antenna device is pulled out, the lower end of the conductor portion of the second antenna is electrically connected to the upper end of the first antenna. Therefore, the length of the second antenna can be short in accordance with the wavelenght of electromagentic waves used. As a result, the housing space of the antenna device can be reduced further.