According to a preferred aspect of the instant invention, there is provided a system and method for content recognition in portable devices. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. Several semiconductor devices 13 are attached to the ceramic base plate by means of lead-free solder 16. The turbine portion of the gas turbine has an inlet in fluid communication with the combustion chamber for performing work by expansion of the first working fluid, and a gas turbine exhaust.