Patent ID: 7579924
Filing Date: 2009-08-25
Classification: H03H,H04B

Abstract:
1. 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 1.55 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 and third elements are connected in series between the first and second input terminals, wherein the first output terminal is connected to a connection node between the first and fourth elements, and wherein the second output terminal is connected to a connection node between the second and third elements, and wherein the first element is an inductor with an inductance of 4.030 nH, and wherein the second element is an inductor with an inductance of 11.208 nH, and wherein the third element is an inductor with an inductance of 2.497 nH, and wherein the fourth element is a capacitor with a capacitance of 2.233 pF.