MULTIPLEX FREQUENCY BAND DMB ANTENNA

摘要

A multiplex frequency band DMB(Digital Multimedia Broadcasting) antenna with a built-in type is provided to control a coupling and an impedance of a terrestrial DMB band by adjusting a distance between an upper radiator and a lower radiator. A multiplex frequency band DMB antenna with a built-in type includes a loop type upper radiator(10), a meander type lower radiator(20), a support structure(30), and a ground surface. The loop type upper radiator(10) covers a mobile communication and satellite DMB bands. The meander type lower radiator(20) covers a terrestrial DMB band. The support structure(30) forms a dielectric substance layer between the upper radiator(10) and the lower radiator(20). The lower radiator(20) includes two shorting posts(21,22). And, a switch unit determines the opening and shorting of each of shorting posts(21,22).