Ultra-wideband bandpass filter with a notch band using EBG array etched ground

Abstract

A novel ultra-wideband (UWB) bandpass filter (BPF) with a notch band is proposed and implemented. The filter is realized by using a high-pass filter (HPF) and an array of multiband electromagnetic bandgap (EBG) cells etched on the ground of a 50-Ω microstrip line. The first and third stopband of the designed EBG array generate sharp falling edges at each side of the passband of the UWB BPF, whereas the second stopband creates a desired notch response. As it is the passband of the designed EBG array at lower frequency, a HPF is involved. The proposed filter was successfully designed, simulated, and fabricated. The measured results show that the proposed BPF has a wide bandwidth from 3.8 to 10.1 GHz with a notch response centered at 5.1 GHz. Both simulated and measured results are described. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1290–1293, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25978