Patent ID: 7639099

Claim:
A dual-frequency matching circuit comprising: first and second input terminals that receive a first RF signal with a frequency of 0.85 GHz and a second RF signal with a frequency of 1.7 GHz, respectively, from an RF circuit with an impedance of 50Ω; first and second output terminals that are connected to an antenna; and a group of circuit elements that are connected between the input terminals and the output terminals, wherein the group of circuit elements includes first, second, third and fourth elements, and wherein the first and fourth elements are connected in series between the first and second input terminals and the second input terminal is short-circuited with the second output terminal, and wherein the second element is connected between the first input terminal and the first output terminal, and wherein the third element is connected between a connection node of the first and fourth elements and the first output terminal, and wherein the first element is an inductor with an inductance of 5.119 nH, and wherein the second element is a capacitor with a capacitance of 1.370 pF, and wherein the third element is an inductor with an inductance of 8.360 nH, and wherein the fourth element is a capacitor with a capacitance of 5.942 pF.