A novel 180 - hybrid is proposed, based on a modifled Gysel power combiner, using phase shifter and ground bridge for the difierence output. Also the Defected Microstrip Structure has been used to increase the hybrid's phase matching. All steps of the design are simulated using HFSS 11 and the flnal design is validated by the fabrication. It has good results between 7GHz to 10GHz and can be used between 6GHz to 11GHz with less accuracy.
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Fartookzadeh et al. (2012) studied this question.
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