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In this work, a wide bandwidth Sequential Power Amplifier (SPA) is demonstrated for the first time. Using wide band and high efficiency 10 Wand 45 W amplifiers, an SPA is described, capable of delivering high efficiency at back-off without the bandwidth limitations of the traditional Doherty PA. Measurement results of the implemented amplifier are presented, with an average back-off drain efficiency of 59 % achieved between 1.45 GHz and 2.4 GHz, and a peak back-oil" drain efficiency of 65 % at 1.7 GHz. Index Terms-Broadband, high efficiency, power amplifiers (PAs).

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