An apparatus and method is related to a wireless system with an antenna that
is
automatically tuned to a desired frequency. The antenna is coupled to an adjustable
tuning circuit to form a tuned antenna circuit that has a resonant frequency. The
adjustable tuning circuit may be adjusted by activating a sweep generator that
varies a tuning element over a broad frequency range. The sweep of the sweep generator
is terminated after the proper frequency is found. Alternatively, the adjustable
tuning circuit may be adjusted using an array of switched capacitors using a successive
approximation method. The tuned antenna circuit may be employed to receive and/or
transmit information. The resonant frequency is dynamically shifted in response
to a data signal such that the antenna transmits FSK encoded signals.
