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This article presents a compact printed monopole antenna for 3G and UWB mobile and wireless communication systems. The antenna consists on printed microstrip arms on a Rogers' substrate with a slotted partial ground plane. The size of the antenna is only 16 mm × 36 mm × 0.83 mm. The simulated and measured results show very good agreement. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1939–1942, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24462 [ABSTRACT FROM AUTHOR]

In this article, we present a novel circular disc antenna for current and future ultrawideband (UWB) applications. The proposed antenna has a small size of 30 mm × 35 mm, a simple geometry, and the excitation is launched through a 50-Ω microstrip feed line. The impedance matching of the proposed antenna is improved by introducing a second microstrip line between the feed line and the circular patch. A prototype of the proposed antenna has been fabricated and its performances are measured. The obtained results show that the proposed antenna operates on UWB frequency range from 2.7 to 28.8 GHz. Measured radiation patterns and simulated gain and radiation efficiency of the proposed antenna are presented and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1130–1133, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24261 [ABSTRACT FROM AUTHOR]