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Proposed is the design of a multiple stage uncompensated Marchand balun. A coplanar waveguide with a ground plane is used as the coupled line structure providing tight coupling by shielding the centre line from the ground. Wide bandwidth is achieved by the combination of a wideband impedance matching L-section and multiple stages of λ/4 step transformers. Measurements indicate an approximate −20 dB return loss from 1 to 7.5 GHz, and less than 4° phase imbalance from DC to 7.2 GHz.
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Xu et al. (2009) studied this question.
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