A new design of compact dual band-notch UWB BPF based on coupled wave canceller

Abstract

The procedure of attaining a compact bandpass filter (BPF) with dual band-notch function for ultra-wideband (UWB) applications is presented and discussed in this paper. In the proposed BPF defected ground structure (DGS) is used in order to improve the out-of-band performance of the filter and also four short-circuited bent stubs are employed in order to improve the selectivity of the filter at its cut-off frequencies. Dual band-notch function is added to the performance of the filter by coupling two short-circuited inverted T-shaped stubs to the filter main resonator. The fabricated filter satisfies well the demands of the Federal Communications Committee (FCC) with two narrow band-notch functions at 5.5 GHz and 8 GHz which eliminates the interference of the UWB system with WLAN and satellite communication systems, respectively. The improved upper stop-band of the proposed filter with more than 20dB attenuation level extends up to 20 GHz.

Design and analysis of compact BPF with dual notch bands based on stepped‐impedance resonator for UWB applications

“…Therefore, the bigger SIR with L 4 = 6 mm, L 6 = 3.2 mm, W 3 = 2 mm, and W 13 = 0.8 mm and the smaller SIR with L 5 = 4 mm, L 3 = 2 mm, W 4 = 2.5 mm, and W 5 = 1 mm is utilized in this design. To improve the design parameters of the suggested filter, a parametric study was carried out .…”