Miniaturized ultra-wideband filter with independently controlled notch bands for 5.1/6/8 GHz wireless applications

• Main Authors: Abdul Basit, Abdul Basit, Khattak, Muhammad Irfan, Zubir, Farid, Shah, Syed Waqar
• Format: Article
• Language: English
• Published: Public Library of Science 2022
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/103655/1/FaridZubir2022_MiniaturizedUltraWidebandFilter.pdf; http://eprints.utm.my/103655/; http://dx.doi.org/10.1371/journal.pone.0268886

A novel three-mode step impedance resonator (TSIR) is developed to design a miniaturized multi-pole microstrip planar ultra-wideband (UWB) filter with independently controlled notched bands at different frequencies is presented in this work. The basic UWB filter consists of four L-shaped λ/4 short-circuited stubs operating in the range of i.e. 2.7 to 12.1 GHz with fractional bandwidth (FBW) 127%, and the TSIR is constructed using two T-shaped λ/2 open ended step impedance resonator (SIR) and one λ/4 short-circuited uniform impedance resonator (UIR) is coupled to the basic UWB design in order to achieve the stopbands performance at 5.1 GHz, 6 GHz, and 8 GHz, to supress the unwanted bands of WLAN, Wi-Fi 6E, and X-band satellite communication system, respectively. Commercial full-wave electromagnetic (EM) software HFSS-13 was used to design an ultra-compact structure having size 0.07 λg×0.02 λg on Rogers RT/Duroid 5880 substrate to justify good agreement between simulated and measured S-parameters.