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A printed triple-band monopole antenna appropriate for use as a terminal antenna in modern wireless multiband systems is proposed. The impedance bandwidth of each band has been optimised using a quasi-Newton technique and the bandwidth includes virtually all wireless bands. Various parameter sweeps are presented which improve our understanding of the antenna, in particular, the effect of groundplane-size and branch-off point on impedance bandwidth and radiation pattern.
John, M. and M. J. Ammann, "Integrated Antenna for Multiband Multi-National Wireless Combined with GSM/800/PCS1900/IMT2000+Extension", Microwave and Optical Technology Letters, vol. 48, issue 3, pp. 613-615, 03/2006.