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Compact dual-band bandpass filter with ultra-wide upper-stopband

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6 Author(s)
Wei, X.B. ; Res. Inst. of Electron. Sci. & Technol., Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Yue, G.T. ; Liao, J.X. ; Wang, P.
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Proposed is a compact dual-band bandpass filter (BPF) using stepped impedance resonators (SIRs). To improve the upper-stopband of the proposed filter, tri-section folded SIRs are used. By adjusting the impedance ratio and electronical length ratio of the tri-section SIR, the out-of-band of the filter can be improved. A 2.09/2.62 GHz dual-band experimental BPF has been designed and fabricated to demonstrate the proposed method. The measured results are in good agreement with the electromagnetic simulation. The spurious frequencies of the upper-stopband are suppressed below 20 dB from 2.79 to 22.13 GHz. The circuit only occupies 0.29 λg × 0.13 λg.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 11 )