Abstract
An ultrabroadband power amplifier using 16-way spatial power divider/combiner that using a quasi-TEM-guided wave structure is designed. An oversized coaxial waveguide was used as the host of the dividing/combining circuits that incorporates an antipodal finline array. Galerkin's technique in the spectral domain was used to analyze the antipodal finline. The oversized TEM-guided wave structure and antipodal transitions were designed using the theory of small reflection and near optimum design. A high power amplifier using 16 monolithic-microwave integrated-circuit power amplifiers is built. The measured results show 160% bandwidth impedance match covering the entire 2–18 GHz with maximum output power of 39 dBm CW (Continous Wave) and corresponding gain greater than 11 dB. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:454–460, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27321
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