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A planar MMIC balun covering 2 to 20 GHz has been demonstrated with better than plusmn1.2 dB amplitude and plusmn9 degrees phase accuracy. This 1.2times1.5 mm 2 circuit is a novel connection of a 2 to 7 GHz spiral coupled line balun, a 6 to 20 GHz coupled line balun, and lumped diplexer filter components with absorbed parasitic elements from the two baluns
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D. E. Meharry (2006) studied this question.
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