Abstract
Two novel wideband bandpass filtering balun power dividers using modified Schiffman phase shifter are proposed in this article. Two types of wideband Wilkinson power dividers are adopted, respectively, in the two structures for wide passband. The Schiffman phase shifters are used in the structures for realizing 180° phase shift between output ports modified by connecting each of them with a short-ended stub for weak coupling coefficient. In addition, two transmission zeros are realized by an open-ended stub connected in parallel at the input port to realize the filtering characteristic. To verify the proposed structures, two wideband bandpass filtering balun power dividers (εr = 3.66，h = 0.762 mm, tanδ = 0.004) centering at 2GHz are designed and fabricated. The simulated and measured results are discussed.
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