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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 fabricated filter exhibits a size of The new filter has a planar topology and is easily integrated with modern portable communication systems.
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 finite 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. The new filter has a wide-30 dB rejection upper stopband from 1.13f0 to 6.52f0. The fabricated filter exhibits a size of The new filter has a planar topology and is easily integrated with modern portable communication systems.