A dual‐band planar inverted‐F antenna (PIFA), presented here, covers both 2.4‐ and 5‐GHz bands used in all IEEE 802.11 WLAN standards. Computed and measured return loss and radiation patterns of the antenna are presented and are in reasonable agreement. Experimental results indicate a very wide 32.5% operational bandwidth in the 5‐GHz band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 138–141, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23016

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[1] Using a Radial Guide Field Matching Method, an investigation is performed into reducing the height of an electronically steered circular array of monopole antennas composed of a central active element surrounded by passive elements being either shortor open-circuited. It is shown that a considerable height reduction can be achieved using top hats attached to monopoles ends and by applying dielectric coating underneath the top hats. The trade-off in achieving height reduction is narrower impedance bandwidth.INDEX TERMS: 0604 Electromagnetics: Antenna arrays; 0609 Electromagnetics: Antennas; 0644 Electromagnetics: Numerical methods; 0674 Electromagnetics: Signal processing and adaptive antennas; KEYWORDS: monopole antennas, antenna height reduction, antenna arrays Citation: Janapsatya, J., and M. E. Bialkowski (2004), Reducing the height of a circular array of monopoles using top hats and dielectric coatings, Radio Sci., 39, RS3004,