Abstract
A compact microstrip-line dual-band bandpass fllter using a short stub-loaded resonator is presented. The resonator is formed by loading one short stub in shunt to a simple uniform impedance line. A key merit of the fllter conflguration is that the center frequency and bandwidth of the flrst passband can be conveniently controlled by properly adjusting the lengths of the short stubs and the coupling between the short stubs, whereas those of the second passband are flxed. To illustrate the concept, a third-order dual-band fllter is designed, fabricated and measured. Simulated and measured results are found to be in good agreement with each other.
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