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Compact Disc Monopole Antennas for Current and Future Ultrawideband (UWB) Applications

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4 Author(s)
Srifi, M.N. ; Telecommun. Syst. Lab., Ibn Tofail Univ., Kenitra, Morocco ; Podilchak, S.K. ; Essaaidi, M. ; Antar, Y.M.M.

Circular disc monopole antennas are investigated for current and future ultrawideband (UWB) applications. The studied antennas are compact and of small size (25 mm × 35 mm × 0.83 mm) with a 50-Ω feed line and offer a very simple geometry suitable for low cost fabrication and straightforward printed circuit board integration. More specifically, the impedance matching of the classic printed circular disc UWB monopole is improved by introducing transitions between the microstrip feed line and the printed disc. Two particular designs are examined using a dual and single microstrip transition. By using this simple antenna matching technique, respective impedance bandwidths (|Sn | <; -10 dB) from 2.5 to 11.7 GHz and 3.5 to 31.9 GHz are obtained. Results are also compared to a classic UWB monopole with no such matching network transitions. Measured and simulated reflection coefficient curves are provided along with beam patterns, gain and group delay values as a function of frequency. The transient behavior of the studied antennas is also examined in the time domain.

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Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 12 )