Abstract
ABSTRACT: A broadband monopole antenna is proposed experimen - tally. A parasitic planar thin conducti e element is placed in parallel withthe monopole, electromagnetically coupling to the monopole. The mea - sured impedance bandwidth for VSWR 2 reaches up to 1:8. 2000John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 209 210,2000. Key words: planar monopole; broadband antenna; input impedance 1. INTRODUCTION Monopole antennas are one of the popular types of antennaswith vertical polarization performance. Recently, a new classof planar monopole antennas has been presented to widenthe impedance bandwidth remarkably, where the planar platesreplaced the wire elements 1 4 . The design with a circulardisk for the Japanese television band covered the range from90 to 770 MHz 1 . After that, some schemes, such as ellipti-cal, square, trapezoidal disks, have been suggested for theenhancement of the bandwidths, and have been analyzedtheoretically and experimentally 1 5.In this paper, a novel broadband monopole antenna isproposed. A parasitic planar square conductive element isplaced in parallel to the monopole. The impedance perfor-mance has been largely improved due to the strong electro-magnetic coupling between the monopole and the parasiticelement. Typically, the measured bandwidth for a VSWR 2reaches up to 1:8 1Ĺ˝. 9 GHz .
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