PURPOSE: A stub antenna of non-linear double bandwidth is provided to perform an operation of resonance in a multiple frequency band by using a non-linear radiative element. CONSTITUTION: A signal is inputted to one end portion of the first radiative element(11) from an external feeding circuit. The inputted signal is transferred to the first radiative element(11) and the second radiative element(12). The second radiative element(12) is extended from the other end portion of the first radiative element(11). The first radiative element(11) resonates with the first frequency. A lower portion of the first radiative element(11) is formed with a shape of zigzag in order to reduce total length of an antenna and form a snap-in connection structure. The total length between a feed point(13) and an upper end portion(14) of the first radiative element(11) corresponds to 1/4 of the length of the first frequency.
