Compact Bandpass Filter with high selectivity and wide stopband using Slotted Stepped-Impedance Resonator |
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Authors: | Jin Xu Yuxue Ji Chen Miao Wen Wu |
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Institution: | 1. Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing, 210094, China
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Abstract: | In this paper, a Slotted Stepped-Impedance Resonator (SSIR) is proposed. Due to the slots in the low-impedance section of the conventional SIR, the new resonator has a lower fundamental resonance f0 and can provide a potential finite transmission zero fz close to f0. Based on the proposed SSIR, a fourth-order Chebychev BandPass Filter (BPF) is designed at f0=1 GHz. The measured results show that a better than –65 dB rejection is achieved on both the lower and the upper stopband. Moreover, the new filter has a wide –30 dB rejection upper stopband from 1.13f0 to 6.52f0. The fab-ricated filter exhibits a size of The new filter has a planar topology and is easily integrated with modern portable communication systems. |
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Keywords: | Key words BandPass Filter (BPF) Stepped-Impedance Resonator (SIR) High selectivity Wide stopband |
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