Compact Spatial Triple-Band-Stop Filter for Cellular/PCS/IMT-2000 Systems

  • Kim, Dong-Ho (Broadcasting & Telecommunications Convergence Research Laboratory, ETRI) ;
  • Yeo, Jun-Ho (School of Computer & Communication Engineering, Daegu University) ;
  • Choi, Jae-Ick (Broadcasting & Telecommunications Convergence Research Laboratory, ETRI)
  • Received : 2008.05.28
  • Accepted : 2008.08.05
  • Published : 2008.10.31

Abstract

We propose a novel spatial multi-band-stop filter using modified multiple loop array elements to block electromagnetic waves or signals of mobile phones in public facilities. It operates at the following frequency bands: Korean cellular (824 MHz to 894 MHz), Personal Communication Service (PCS) (1.75 GHz to 1.87 GHz), and IMT-2000 (1.92 GHz to 2.17 GHz). Two frequency selective surfaces with modified multiple-loop elements are printed on the top and bottom of a pair-glass pane, which is a pair of glass panes with an air gap between them. A modified multiple-loop element with a meander line is used to make the size of the filter compact. The simulated and measured results show good agreement, which confirms the usefulness of the proposed tri-band spatial filter.