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A novel miniaturised dual-band bandpass filter (BPF) using improved split ring λ/4 resonator and stepped impedance resonator (SIR) is proposed. A simple analysis is given for each resonator. By tuning the geometric parameters of the resonators, the two passbands of the BPF can be adjusted separately. Source-load coupling is adopted to achieve more transmission zeros in the stopband. The new dual-band...
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