This whitepaper presents RF simulations of two different methods of implementing power combining of eight, 1kW, 500 MHz solid state power amplifiers. The first using eight circulator plus isolation loads feeding an 8-way impedance combiner. The second method utilizes an eight input Gysel type power combiner. The overall electrical performance, response to the loss of one or two amplifiers, and estimated costs of each method is also compared to illustrate the issues involved.
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