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Novel microwave bandpass filters using defected-ground structures

N. MILITARU1,* , M. G. BANCIU2, G. LOJEWSKI1

Affiliation

  1. Faculty of Electronics, Telecommunications and Information Technology, University POLITEHNICA of Bucharest, 061071, Bucharest, Romania
  2. National Institute R&D for Materials Physics, 077125, Bucharest-Măgurele, Romania

Abstract

In this paper a study of some microwave microstrip bandpass filters (BPF) using defected ground structures (DGS) is presented. This technique allows designs of tight couplings without the necessity of using very narrow coupling gaps. Based on the results of the study, four-pole cross-coupled planar microwave bandpass filters with a single and with two ground slots are designed, fabricated and measured. The performances of these novel structures indicate some technological advantages, compared to classical microstrip filters, without defected ground..

Keywords

Filter, Defected ground, Transmission zeros, Cross-coupling, Extended coupling matrix, Hairpin resonator.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

N. MILITARU, M. G. BANCIU, G. LOJEWSKI, Novel microwave bandpass filters using defected-ground structures, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1060-1064 (2007)