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A novel split ring and complementary split ring resonator is proposed in this letter.The proposed resonator can generate two notches without increasing the physical size. A microstrip lowpass filter (LPF) is designed based on the proposed resonator. The cutoff frequency of the designed LPF is 3.7 GHz and the stopband with an attenuation level lower than −20 dB is obtained from 3.9 to 7.5 GHz. The...
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