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A miniaturised dual-band bandpass filter (DB-BPF) centred at 2.45/5.70 GHz using novel symmetric double-spiral resonators is proposed. The measured and simulated results of the proposed DB-BPF are in good agreement with each other except for a slight frequency shift downwards in the measurement. According to the measurements, the measured 3 dB bandwidths are 6.53% (2.35–2.51 GHz) at 2.45 GHz and 4...
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