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    Design of a Power Output Unit for HF Transmitters
    (IEEE, 2017) Palamutcuogullari, Osman; Ozoguz, Serdar; Aydin, Omer; Kaya, Ilker; Atasoyu, Mesut
    In this paper, complete power output unit for an highfrequency (3-30MHz) transmitter system is presented. The system consists of a 4: 1 power combiner block, a power control unit which is vital for the effective operation of the system and four commercially available power amplifiers. In order to achieve high-performance, we have focused on the design of power combiners and power control unit. To this end, modeling and analysis of power combiners are reconsidered and an efficient power combiner realization based on double-sided parallel-striplines is obtained. Using the proposed power combiners and the designed power control unit, the overall 1000W high-frequency output stage is built and its performance is verified via measurements results.
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    Wideband Hybrid Power Combiner using Double-Sided-Parallel-Strip Lines
    (IEEE, 2016) Atasoyu, Mesut; Ozoguz, Serdar; Paker, Selcuk; Palamutcuogullari, Osman
    A new design of a hybrid power combiner using double-sided parallel-striplines is proposed for wideband and high power applications. The circuit is used to realize a 4: 1 power combiner. The use of double-sided parallel-strip lines adds flexibility to the design, since different characteristic impedances can readily be realized by simply adjusting the offset between parallel lines, without having to change the width of the lines. Moreover, a new approach using ferrite cores in order to improve low frequency performance of the power combiner is successfully applied. The proposed power combiner is studied analytically; its performance is verified via detailed HFSS simulations and measurements results.