Patent ID: 8717248

Claim:
An electronic device for processing radio frequency (RF) signals, comprising: an antenna; an RF circuit; and a matching circuit configured to provide variable impedance between the antenna and the RF circuit, wherein the antenna is capable of operating in a first frequency band or a second frequency band according to the variable impedance, and comprising: a first element having a first terminal and a second terminal, wherein the first terminal is coupled to the antenna; a second element having a third terminal connected to the second terminal of the first element and a fourth terminal coupled to the RF circuit; a first tuning cell connected to the second terminal of the first element and the third terminal of the second element, and comprising a first tuning element, a second tuning element and a first control element, wherein the first control element determines whether to make a first node connected between the first and second tuning elements couple to a voltage level according to a first control signal; and a selecting circuit coupled to the first control element and configured to generate the first control signal so as to adjust the variable impedance.