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Phase-Switched TMNs achieve tunability by incorporating one or more phase-switched variable reactances (circuit elements which resist changes in the current flow rate). Using an innovative method, circuit elements such as capacitors or inductors are reconfigured to become tunable circuit elements which can then be assembled into a larger Tunable Matching Network. In addition, the TMN can be integrated into a novel highly efficient RF amplifier, called a zero-voltage-switched switching RF amplifier, which can modulate a wide range of output power, match highly variable loads and operate over wide frequency ranges.