METHOD FOR EMBODING ANTENNA CIRCUIT OF MOBILE PHONE FOR REDUCING AN INFLUENCE OF HUMAN BODY

摘要

PURPOSE: A method for implementing an antenna circuit of a handheld phone is provided to avoid performance deterioration of the antenna and increase of a standing wave ratio when the handheld phone is used closed to a human, and increase visible distance of the handheld phone. CONSTITUTION: An antenna circuit of a handheld phone is implemented by providing a RF module(10) having a first impedance, an antenna having a second impedance, and a matching circuit(30) coupled between the RF module(10) and the antenna for impedance matching. For implementing the antenna circuit, a pure resistor component value of the antenna and a pure resistor component value of the RF module(10) are searched from a Smith chart as a first and a second points. A parallel capacitance and a serial inductance for displacing the first and the second points are obtained from the admittance chart and the impedance chart of the Smith chart. An inductor(L) of the inductance is coupled between the RF module(10) and the antenna(ANT). A capacitor(C) of the capacitance is coupled to the antenna(ANT) and a ground in parallel to the inductor(L).