Broadband Bandpass Filter for UWB Networks with Multiple In-Band Transmission Zeros

Abstract

Proposed in this manuscript is a broadband bandpass filter (BPF) with dual in-band transmission zeros (TZs) and elongated stopband for application in ultra-wideband (UWB) networks. The basic structure is developed on the principle of broadside coupling of microstrip-to-coplanar waveguide (CPW). Semi-elliptical microstrips on the top are arranged in back-to-back manner and coupled to the open circuited CPW in the ground. The basic BPF is of 3rd order with good insertion/return loss. To this basic BPF structure multiple defected ground structures (DGS) in the shape of complimentary split ring resonator (CSRR) are appended to place dual Tzs within the passband and later dumbbell-shaped DGS are engraved in the CPW to widen the stopband. Also, an approximate equivalent lumped element circuit model is developed and its frequency characteristics matched against full-wave EM simulation. The proposed dual notched BPF is finally fabricated and is found to occupy a compact area of 13.6 × 6.75 mm².

KEYWORDS:

• Bandpass Filter (BPF)
• Broadside coupled
• Coplanar waveguide (CPW)
• Defected ground structures (DGS)
• Surface-to-surface transition
• Ultra-wideband (UWB)

Additional information

Notes on contributors

Abu Nasar Ghazali

Abu Nasar Ghazali received his BTech degree in electronics & communication engineering (ECE) from SRM University, Chennai, in 2008 and ME degree in microwave engineering from Birla Institute of Technology (BIT) Mesra, in 2010 where he was a GATE scholar. He completed his doctorate in 2014 from BIT Mesra. He worked as an assistant professor (I) in the Dept of ECE at the BIT Mesra, Patna campus. Currently, he is an assistant professor (II) in the School of Electronics Engineering, at the Kalinga Institute of Industrial Technology (KIIT), deemed University, Bhubaneswar, India

He is an Associate Member, The Institution of Engineers (IEI), India and member of IEEE. He has published papers in SCI/SCOPUS indexed journals and conferences. His main research interests are UWB filters, microstrip filters and passive microwave circuit components.

Jabir Hussain

Jabir Hussain received his BTech degree in electronics and telecommunication from Assam Engineering College in 2009 and MTech degree in RF and microwave engineering from IIT Kharagpur in 2016 where he was a GATE scholar. He worked as an assistant professor in the School of Electronics Engineering at KIIT deemed University, Bhubaneswar, India, from 2016 till 2019. Currently he’s an early stage researcher in the microwave components group, Department of Electrical, Electronic and Communication Engineering, at the Public University of Navarre, Spain.

His research interests include microstrip based circuit, microstrip filters and mixed signal design. Email:[email protected]