Abstract
ABSTRACTIn this article, a novel triband bandpass filter with high design flexibility and wide stopband is designed by combining a shorted stub‐loaded resonator and two cross‐coupled DGS (defected ground structure) resonators [two RF (radio frequency) passages] with the same feeding structure. The three passbands can be flexibly designed not only because there is no cross‐coupling between the two passages but also because the harmonic passband can be easily eliminated just by embedding the feeding structure with open‐circuited stubs, while the performance of the three passbands remains the same. What's more, there are two transmission zeros beside each passband. A prototype filter with three passbands centered at 1.57, 3.45, and 5.28 GHz is designed and fabricated, and it behaves a wide upper stopband to about 9.6 GHz with rejection better than 20 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1226–1228, 2015
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