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Abstract
This article presents a novel branch-line coupling topology, which offers superior performance to the conventional branch-line coupler. The structure of the proposed network is very simple; in fact, only one additional transmission line element is required to modify the ever-present branch-line coupler in such a way that the bandwidth is enhanced by roughly 25%. The proposed structure is analyzed using an even–odd analysis, and closed-form expressions for the dimensioning of the network parameters are given. The transmission-line impedances are equal or very close to the system’s impedance, and there is no need for very low or high transmission-line impedances.
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