Abstract: A detachable battery pack is connected to a personal computer card modem at the same side as an antenna. An advantage of this system is that the detachable battery pack can be added and removed from the personal computer card without affecting the antenna connection to the personal computer card. The antenna need not be connected to the personal computer card through the battery pack.

Abstract: An extendable antenna for a personal computer card uses two main antenna elements. A movable antenna element can be positioned in an extended position such that the base of the second antenna element electrically contacts the top of the other antenna element. The antenna in the extended position is connected to the antenna port through matching circuitry. In a closed position of the antenna, the second antenna element is electrically connected to the antenna port bypassing the matching circuitry. In one embodiment, the antenna is a quarter-wave length antenna in the closed position and a half-wave length antenna in the extended position.