DGS-based Chebyshev Low-pass Filter for Wireless Communication

Abstract

This work reports a systematic design of 5-pole and 7-pole low-pass Alter using defected ground structures for wireless communication system. The cut-off frequency 5GHz of the LPF has been selected to cover all the wireless communication bands (PCS-1900, UMTS, IMT-2000, ISM, Bluetooth, RFID, WLAN, and WiMAX bands). The sharpness of cut-off improves significantly from 8.3 to 19.2 dB/GHz, 20 dB rejection from 7.1 to 11.6 GHz and the 30 dB rejection bandwidth increases from 2.5 to 5.9 GHz with increase in the order of Alter from 5-pole to 7-pole.

Keywords:

• Defected ground structure
• Low-pass filter
• Microstrip

Additional information

Notes on contributors

Ashwani Kumar

Ashwani Kumar was born in Uttar Pradesh, India, in July 1979. He received the B.Sc. (H) Electronics, M.Sc. Electronics and M.Tech. Microwave Electronics from University of Delhi, Delhi, India in 2000, 2004 and 2006 respectively. He is an assistant Professor in Sri Aurobindo College, University of Delhi. He is currently working towards the Ph.D. degree at Department of Electronic Science, University of Delhi, India. He is a student member of MTT Society IEEE, USA. His research interests include the study of DGS, Periodic lines and Metamaterial. He is also interested in designing of DGS, periodic lines and metamaterial based microwave passive components. E-mail: [email protected]

A. K. Verma

A. K. Verma was born in Bihar, India, in October 1948. He received his Bachelor degree in Electronics and Communication Engineering in 1970 from B.I.T. Sindri, India, and Ph.D in Microwave Engineering in 1984 from Ranchi University, India. For 15 years he worked as broad casting engineer for the installation and maintenance of radio broadcasting studios, MW, SW and TV transmitters, and Satellite ground terminals. He is professor in the Department of Electronic Science, University of Delhi, India. He is involved in teaching Microwave Integrated Circuits, Antenna and Microwave Measurements. His research interest is in the field of closed form modeling of MMIC elements for dispersion, losses, discontinuities and slow wave propagation. He is interested in microstrip antenna, pulse propagation on multilayer micro-strip lines, filters, and couplers. He is also interested in DGS, periodic lines and metamaterial based components design. Prof.Verma is a member of MTT-S, IEEE, USA. Since 1992, he is a Fellow of Institution of Electronics and Telecommunications Engineers, India, and a Fellow of Broad casing Engineering Society, India. E-mail: [email protected]