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A notched ultra-wideband (UWB: 3.1GHz–10.6GHz) bandpass filter (BPF) using step impedance resonator (SIR) with LTCC technology and coplanar waveguide (CPW) was presented in this paper. And it with a controllable narrow notch (rejection) band with 1/2λ SIR structure. It was verified that the SIR was able to create a narrower notch band than other structures, such as spur-lines and open circuited. And...
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