Circuit for dual band tuning

摘要

A dual band RF tuning circuit (1) has a first impedance element (4) and a second impedance element (5) between an RF input port (2) and an RF output port (3). Tuning is provided by the impedance elements (4,5) to a first RF signal and a switching transistor (9) is connected to the second impedance element (5) to short the second impedance element (5) for tuning to a second RF signal by the first impedance element (4) alone. <IMAGE>