IMPEDANCE MATCHING FOR VARIABLE IMPEDANCE ANTENNAS

摘要

An impedance matching circuit (128) for a wireless communication device includes: a first node that receives a first impedance; a second node that is connected to an antenna (124) having a second impedance; a first variable capacitor (204) that is connected between the first node and a third node;a second variable capacitor (216) that is connected between the third node and a reference potential; a first inductive element (212) that is connected in parallel with the second variable capacitor (216) between the third node and the reference potential; and a third variable capacitor (224) and a second inductive element (228) that are connected in series between the third node and the second node.