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A wideband planar monopole employing two broadbanding techniques is investigated, and is shown to yield an impedance bandwidth ratio of 10:1 or greater for a return loss of 8 dB. The radiation pattern bandwidth is also investigated
Ammann, M.: A wideband monopole for reconfigurable multiband radio terminals. Antennas and Propagation Society, IEEE International Symposium, Vol. 1, pp.170-173. Boston, United States, 8-13 July, 2001.