Abstract
AbstractWe propose an electrically small antenna that achieves broad bandwidth with small antenna size. This antenna is composed of a hemispherical disk‐loaded monopole and a hemispherically wound helix to maximize the disk loading effect and the electromagnetic coupling between the two radiating elements in a given space. The fabricated antenna is 10.7 cm in size (kr = 0.449) and exhibits a measured −3 dB bandwidth of about 30% for a center frequency of 200 MHz. The antenna also achieves a radiation efficiency of over 85% and a transmission loss similar to that of a conventional λ/4 monopole, despite the fact that size of the antenna is about 30% that of the λ/4 monopole. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1369–1372, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25164
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