PLANAR INVERTED F ANTENNA

Provided is a planar inverted F antenna to which a feeding line can be readily connected. Two slits are provided up to locations where input impedance is Z (=50 ), from the open end side of a main conductive plate that functions as an excitation conductive plate. Between these slits is used as a microstrip line (MSL) and the width (w) is determined such that the characteristic impedance for the transmission line is Z. A planar inverted F antenna having a U-shaped or L-shaped cross-section is formed by folding on both sides or on one side of the MSL, along the longitudinal direction of the MSL. In other words, a planar inverted F antenna is formed that has the excitation conductive plate and the MSL arranged separated by a prescribed distance, on the outside of a ground conductive plate bent into a U-shaped or L-shaped cross-section. The positional relationship between the connection position for the feeding pin and the radiation end can be changed, by folding the planar inverted F antenna along the longitudinal direction of the MSL.