Patent attributes
A planar inverted F antenna has a ground conductive plate and a main conductive plate that are short-circuited by a short circuit member. The main conductive plate connects to a feeding line for feeding power to the antenna and includes opposite side ends, a base extending from one side end to a prescribed position in the direction toward the other side end, and at least one slit extending from the other side end up to the prescribed position to form a microstrip line to which the feeding line is connected and at least one excitation conductive plate spaced apart from the microstrip line. Power is supplied to a feeding point at the prescribed position from the feeding line via the microstrip line which has a width selected so that both an input impedance of the antenna at the feeding point and a characteristic impedance of the transmission line become Z.
