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Keywords:

  • bandstop;
  • defected ground structure;
  • elliptical antennas;
  • L-shaped parasitic strip;
  • rectangular slits;
  • slot antennas;
  • ultrawideband

Abstract

In this letter, a microstrip fed ultra-wideband (UWB) antenna with different band rejection techniques is presented. The designed antennas consist of a defected ground plane with an elliptical slot and elliptical shaped radiating element. The measured and calculated impedance bandwidth of the proposed antenna ranges from 3 to 14 GHz for a return loss (S11) less than −10 dB. Also, it has a relatively stable radiation patterns over its whole frequency band of interest. Two different techniques have been proposed to achieve band-notch characteristic in the 5.0- to 6.0-GHz wireless local area network frequency band. The first one uses L-shaped parasitic strip into the radiating patch, whereas the other one uses two rectangular slits cut away from the ground plane creating defected ground structure. The proposed antenna is considered a good candidate for UWB applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:181–187, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26449