Band Notched UWB-BPF Based on Broadside Coupled Microstrip/CPW Transition

ABSTRACT

A planar band notched ultra-wideband (UWB) bandpass filter based on broadside coupling of microstrip/co-planar waveguide (CPW) transition is proposed and implemented. The UWB filter topology is made up of microstrip lines on the top coupled in broadside fashion to an open ended CPW in the ground plane. Dual narrow notches at 5.2 and 7.9 GHz are implemented by etching two meander shaped defected ground structures in the CPW under the microstrip lines. A wideband stopband for improved isolation is obtained with the suppression of spurious harmonics by the attenuation poles generated by the spur line structures embedded in the input and output feeding lines. The proposed structure exhibits good frequency characteristics and is of compact size.

KEYWORDS:

• Bandpass filter (BPF)
• Co-planar waveguide (CPW)
• Defected ground structures (DGS)
• Spur line
• Ultra-wideband (UWB)

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Abu Nasar Ghazali

Abu Nasar Ghazali received his BTech degree in electronics and 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 in the Department of electronics and communication engineering at the Manav Rachna College of Engineering, Haryana in 2010 and is currently an assistant professor at the BIT Mesra, Patna campus.

He is an associate member of The Institution of Engineers (IEI), India, and member of IEEE. He has published quite a few papers in peer reviewed journals and conferences. His main research interests are UWB filters, defected ground structures, microstrip filters, and microwave circuit components.

E-mail: [email protected]

Avantika Singh

Avantika Singh did her BTech degree from BIT Mesra, Patna Campus in 2014 and is currently pursuing her Master's degree in integrated circuit (IC) design at the Nanyang Technological University (NTU), Singapore, under the Technische Universität München joint programme, Germany (NTU-TUM). She was ranked 2nd at the Electromagnetics Olympiad organised by the IEEE AP-MTT chapter, Kolkata, India in 2013. Her project on Innoculation Monitoring Device (IMD) was selected in top 15 of IEEE President's change the world Competition in 2013.

She has published several papers in journals and at the IEEE conferences. Her research interest lies in RF/Microwave circuit design, analogue/digital IC design, RFIC.

E-mail: [email protected]