Patent ID: 7642977

Claim:
An extendable built-in antenna unit for a mobile device, the antenna unit comprising: an antenna receiving part formed in the mobile device, having a first portion and a second portion; a helical antenna extractably and retractably mounted in the antenna receiving part; a whip antenna extractably and retractably mounted in the helical antenna, a feed point formed in the first portion of the antenna receiving part; and an intenna pattern formed in the second portion of the antenna receiving part, wherein, when the helical antenna and the whip antenna are retracted, the helical antenna and the whip antenna are wholly inserted in the antenna receiving part, and the helical antenna is connected to the feed point and the intenna pattern, and signals are transmitted through the helical antenna and the intenna pattern, and wherein, when the helical antenna and the whip antenna are extracted, the helical antenna and the whip antenna connect in series, and the helical antenna is connected to the feed point, and signals are transmitted through the helical antenna and the whip antenna.