RESONANCE FREQUENCY AND INPUT IMPEDANCE CONTROL THE MULTIPLEX FREQUENCY BAND INTERNAL ANTENNA WHICH IT IS POSSIBLE

摘要

A multi frequency band internal antenna controlling a resonant frequency and an input impedance is provided to adjust the value of an inductor selectively according to operation method(GSM/DCS/UP-PCS/WCDMA) of a mobile communication terminal, by controlling the resonant frequency and the input impedance by coupling variation due to electrical length change of a feeding point and a short circuit point by the value of the inductor. A multi frequency band internal antenna controlling a resonant frequency and an input impedance controls the resonant frequency and the input impedance by including an inductor(30,40) between a short-circuit point and a ground plane(50), one feeding point and two short-circuit points. The internal antenna comprises a PIFA(Planar Inverted F Antenna)(10) and a half-wavelength loaded line antenna(20), and shares two short-circuit pins and one feeding pin(12).