Abstract
The authors present the full even–odd mode analysis of two novel power routing schemes and the router-integrated dual-operating mode amplifier. The routers provide two switchable operating states: a two-way 3-dB power divider (1 : 1) or a one-way signal path (1 : 0). These power routers, which satisfy matching requirements for the two different operations, are realised by means of coupled-line couplers. A 2.12 GHz GaAs FET dual-operating mode amplifier was demonstrated by employing the power routers. Switching the ratio in the amplifier prevents power losses through both the divider and combiner in a conventional balanced amplifier when one of the amplifiers is inoperable. Moreover, it has an attractive feature to enhance the amplifier efficiency by dynamically switching power dividing and combining ratios as well as controlling the operation of two reference amplifiers in a balanced-like configuration. The measured results of the implemented GaAs FET dual-mode amplifier in both the static and dynamic operations showed advantages over an in-phase balanced amplifier with an ordinary 3-dB Wilkinson power divider/combiner.
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