Patent ID: 7176845

Claim:
An antenna matching system comprising: an antenna having an interface port with a frequency-dependent impedance; and a sub-band matching circuit including an output port connected to the antenna interface port, the sub-band matching circuit including: a first tuning circuit selectively tunable to a first sub-band within a first communication band and selectively tunable to a second sub-band within a second communication band, the first tuning circuit comprising a first tunable ferroelectric (FE) capacitor having a first variable dielectric constant responsive to a first control voltage; and, a second tuning circuit selectively tunable to a third sub-band within the first communication band when the first tuning circuit is tuned to the first sub-band and selectively tunable to a fourth sub-band within the second communication band when the first tuning circuit is tuned to the second communication band, the second tuning circuit comprising a second tunable FE capacitor having a second variable dielectric constant responsive to a second control voltage; wherein the first tuning circuit and the second tuning circuit supply a first conjugate impedance for receiving the first communication band on the antenna interface port and supply a second conjugate impedance for receiving the second communication band on the antenna interface port.