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Two microstrip multiband diplexers are investigated in this paper. The diplexers consist of channel bandpass filters and long feeding lines. Every bandpass filter controls one respective channel characteristic resulting in a high design freedom. The channel filters are fed through long microstrip feeding lines with good isolating property. The proposed method is then time-saving in comparison with previous ones. To validate the design concept, four-and six-channel diplexers are designed, fabricated, and tested.Index Terms-Multiband multiplexer.