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Xiao, Jian-Kang; Zhu, Yu-Feng; Li, Yong; Li, Xi-Wen
Electronics letters, 04/2014, Letnik: 50, Številka: 9Journal Article
A novel quad-band bandpass filter with individually controllable centre frequencies and bandwidths using a folded stepped-impedance resonator (SIR) is proposed. The new filter that centres at 2.4, 3.3, 4.1 and 5.2 GHz has a measured passband insertion loss of no more than 1.6 dB, and has a miniature circuit size of 0.448λg × 0.027λg. The presented filter is fabricated and tested, and the experiment demonstrates the new design. The new quad-band bandpass filter has compact and simple circuit topology, good performance of low passband insertion loss and transmission zeros, and greatly reduced circuit size compared with the relative reports.
