Built-in antenna for portable wireless terminal

PURPOSE: An integrated antenna device of a portable terminal wireless terminal is provided to improve the radiation efficiency by using a metallic tool of a portable wireless terminal as the ground of an antenna radiator. CONSTITUTION: A mainboard(310) includes a feeding pad and a grounding pad. The feeding pad is connected to a feeding unit. The feeding unit supplies the electric signal. The grounding pad is connected to the ground. An antenna radiator(320) is electrically connected to the feeding pad and the grounding pad of the mainboard. The antenna radiator radiates the signal in a fixed frequency band. A conductor interlinks the grounding pad of the mainboard and a metallic tool(330) of a portable wireless terminal. The ground and metallic tool of the mainboard are used as the same ground of the antenna radiator.