Design of ultra-wideband bandpass filter with two reconfigurable notches using terminated cross-shaped resonator

An ultra-wideband (UWB) bandpass filter (BPF) with two reconfigurable notch bands is proposed, based on cross-shaped resonator (CSR) without using coupled line structure. With the use of even and odd-mode approaches, the proposed UWB bandpass filter bandwidth is from 2.8–10.9 GHz, with 118% fractional bandwidth (FBW), and the dual reconfigurable notch bands is tuned from 4–5.3 GHz, and 7.9–8.8GHz.