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access icon openaccess Notched UWB filter using exponential tapered impedance line stub loaded microstrip resonator

This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 15/03/2018, Accepted 12/06/2018, Revised 15/05/2018, Published 16/08/2018

In this study, two ultra-wideband (UWB) filters having the fractional bandwidth >120% are designed, analysed and fabricated. The first filter is designed with three quarter-wavelength short-circuited stubs and second by using exponential tapered impedance line stub loaded microstrip resonator. The first filter consists of five transmission poles within the passband. The second filter with tapered inductive loading on quarter-wavelength high impedance line exhibits a sharp notch stopband around 5.5 GHz, to suppress the interference from IEEE 302.11a WLAN band signals with an attenuation level >30 dB. A good agreement between the measured and predicted results is achieved, which validate the authors’ filter designs.

Inspec keywords: microstrip filters; notch filters; microstrip resonators; wireless LAN; ultra wideband technology; resonator filters

Other keywords: ultra-wideband filters; quarter-wavelength short-circuited stubs; notched UWB filter; exponential tapered impedance line stub loaded microstrip resonator; tapered inductive loading; IEEE 302.11a WLAN band signals; quarter-wavelength high impedance line

Subjects: Passive filters and other passive networks; Waveguide and microwave transmission line components

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