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A compact ultra-wideband (UWB) bandpass filter with an inherent notched band and steep slopes has been presented and implemented with the low temperature cofired ceramic technology. The filter is realized by a stepped-impedance T-shaped resonator (SITR) coupled to a pair of quarter-wavelength input/output feed-lines. The proposed SITR can facilitate not only a notched band, but also sharp roll-off...
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