This paper aims at designing adjacent dual-passband filters for cell phones with dual-band operation (1.8GHz/1.9GHz). Several related papers have been published recently. However, dispersive and complicated design techniques make it arduous to design an adjacent dual-passband filter successfully based on only one or two related papers. Techniques about improving the passband performances of the experimental filters are almost ignored in these published papers. In our paper, comprehensive and systematic design procedure has been addressed. The reader can clearly understand every key points in designing adjacent dual-passband filters by this paper. Besides, skills and fine tuning methods for improving passband performances have been proposed in this paper.
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