Abstract
Dualband Bandpass Filter (BPF) is a microwave device used in communication systems for selecting two wanted frequency bands while rejecting the unwanted frequencies. A Dual-band BPF provides the opportunity to have two BPF's built together. It reduces cost and can occupy less space when compared with two BPF's with the same properties. In [1] three pairs of U-shaped resonators were coupled in a parallel configuration to achieve a dual-band BPF. In [2], a dual-band BPF was achieved by inserting a stop-band into a wide-band BPF using a cascade connection. In [3],using stub-loaded resonators (SLRs), a dual-band BPF was implemented with improved frequency selectivity using spur-lines.
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