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A new type of lowpass filter with an ultra-wide stopband, sharp transition and compact size is proposed. To reduce the circuit size, a bended transmission line is adopted in the stepped impedance resonators. To achieve a sharp roll-off, a pendulum-shaped resonator is implemented in the filter. The transition band is from 1.30 to 1.45 GHz with -3 and -20 dB, respectively. The stopband with an attenuation...