Table of Contents
International Journal of Microwave Science and Technology
Volume 2010, Article ID 624846, 4 pages
Research Article

Very Wideband, Compact Microstrip Bandstop Filter Covering S-Band to Ku-Band

MEMS Development Divison, Semiconductor Laboratory (SCL), S.A.S Nagar, Chandigarh 160071, India

Received 2 September 2010; Accepted 22 November 2010

Academic Editor: Yong-Woong Jang

Copyright © 2010 Kamaljeet Singh and K. Nagachenchaiah. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper reports a wide bandwidth planar bandstop filter with improved RF characteristics. The proposed filter on alumina is realized incorporating tapped open stub along with spurline topology. Further, stepped impedance resonator (SIR) approach has been introduced in the tapped stubs to achieve wider band performance with improved selectivity. The proposed topology effectively controls the transmission poles. Fabrication of this BSF has been carried out on glass substrate showing minimal effect of permittivity variation on bandwidth performance. This validates the applied approach with achievable bandwidth of more than 100% ranging from S- to Ku-band. Close agreement with simulation and practical results have been demonstrated with measured insertion loss of less than 1 dB and attenuation loss better than 30 dB at C-band.