Patent ID: 6907234

Claim:
An apparatus that includes an antenna that is automatically tuned, the apparatus comprising: a tuned circuit that includes the antenna and an adjustable tuning circuit, wherein the tuned circuit has a resonant frequency that is adjustable with a control signal; an amplifier circuit that is arranged to provide an output signal in response to an input signal that is received from the tuned circuit; a feedback circuit that is arranged to selectively couple at least a portion of the output signal to the tuned circuit such that the tuned circuit, amplifier circuit, and feedback circuit operate as an oscillator that oscillates at the resonant frequency when the feedback circuit is active; a receiver circuit that is tuned to a selected frequency is arranged to receive the output signal and to provide an indicator signal, wherein the indicator signal indicates a signal level of signals received at the selected frequency; and a tuning adjustment circuit that is arranged to selectively provide the control signal such that the control signal is adjusted until the signal level of the indicator signal exceeds a predetermined threshold, wherein the signal level of the indicator signal exceeds the predetermined threshold when the resonant frequency of the tuned circuit is matched to the selected frequency of the receiver.