Design of Compact UWB Filter Using Parallel-coupled Line and Circular Open-circuited Stubs

Abstract

This article encompasses the design of compact ultra-wideband (UWB) bandpass filter with low insertion loss and high selectivity using circular open-circuited stubs (COSs). Low insertion loss from two COSs and Multiple Mode Resonator (MMR) from three pairs of parallel-coupled lines are constituted to obtain the UWB band. The proposed filter has multiple resonant frequencies in the passband and two transmission zeros perceived at stop band/passband transition edges. It has a 3-dB fractional bandwidth of 110% and it covers the entire UWB band of 3.1–10.6 GHz. The measured passband insertion loss and group delay are 0.35 dB and 0.42 ns, respectively. Moreover, the presented filter is a single-layered structure since it is more comfortable to be integrated into a printed circuit board (PCB). The simulated and measured performance of the presented filter is in good agreement. The filter finds its application in low power handling single-layered PCBs, unlicensed short and medium distance communications.

KEYWORDS:

• Asymmetric parallel coupled lines (APCL)
• Circular open-circuited stubs
• Single-layered structure
• UWB bandpass filter

Additional information

Notes on contributors

Parthasarathy Ramanujam

Parthasarathy Ramanujam received his BE, and ME degrees from Anna University Chennai in the years 2012 and 2014, respectively. He is currently serving as an assistant professor in the Department of Electronics and Communication Engineering, St Joseph's College of Engineering, Chennai, India. His research interests include microwave components and circuits, antenna engineering, signal integrity analysis and solution to EMI problems. Pursues PhD in Anna University in microwave antennas. To his credit, he has published several research articles on antennas and microwave components in leading international journals. He has also presented and published his research articles in the proceedings of international conferences. He is currently serving as reviewer in International Journal of RF and Microwave Computer aided Engineering and International Journal of Microwave and Wireless Technologies.

Chandrasekar Arumugam

A Chandrasekar received his BE in computer science engineering in 1996 from Bharthidasan University, ME in software engineering in 2000 from College of Engineering, Anna University and PhD degree in 2009 from Anna University. He is professor and head of the department of CSE at St. Joseph's College of Engineering, Chennai, Tamil Nadu, India. His research interests include microwave components, network security, cloud security, data mining, artificial intelligence and big data analysis. Email: [email protected]

Ramesh Venkatesan P G

Ramesh Venkatesan P G received his BEng in electronics and communication engineering in 1996 from Bharthidasan University, MTech in laser and electro optical engineering in 2000 from College of Engineering, Guindy, Anna University and PhD Degree in 2014 from Anna University. He is currently working as professor in Department of Electronics and Communication Engineering. His research interests include RF and microwave components, elastic optical networks, resource provisioning, traffic shaping for contention control and hybrid switching for access networks in optical transport networks. Email: [email protected]

Manimaran Ponnusamy

Manimaran Ponnusamy was born in Chennai, India, in June 1979. He received the bachelor's degree in electronics and communication engineering form Uni versity of Madras in 2001 and masters and PhD degrees in electronic engineering and optical communication from Madras Institute of Technology, Anna University, Chennai, India in 2005 and 2018, respectively. He has diversified experience both as engineer and an academician. He worked for a Japanese firm as a senior electrical engineer (R&D) for two years overseas. Since 2008, he has taken up academics and research as his profession and passion. Currently, working as senior assistant professor in School of Electronics Engineering (SENSE) under the Department of Communication Engineering, Vellore Institute of Technology, Vellore, India (declared as Institute of Eminence (IoE) by Government of India) and he has a close relationship and interaction with current industries. His current research and area of interests are SOA, fiber optic sensors, modelling of optoelectronic devices, RF and microwave components and planar antennas for 5G applications. Email: [email protected]