Compact dual‐band bandpass filter with ultra‐wide upper‐stopband. Issue 11 (1st May 2013)

• Record Type: Journal Article
• Authors: Wei, X.B.; Yue, G.T.; Liao, J.X.; Wang, P.; Xu, Z.Q.; Shi, Y.
• Is Part Of: Electronics letters. Volume 49:Issue 11(2013)
• Page Start: 708
• Page End: 709
• Publication Date: 2013-05-01
• Subjects: band‐pass filters -- ultra wideband communication; electromagnetic simulation -- stepped impedance resonators -- ultra‐wide upper‐stopband -- compact dual‐band bandpass filter; band‐pass filters -- ultra wideband communication; electromagnetic simulation -- stepped impedance resonators -- ultra‐wide upper‐stopband -- compact dual‐band bandpass filter; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2013.0862
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : 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.