A broadband folded‐slot antenna with a semi‐circular extension

A coplanar waveguide (CPW)-fed broadband folded-slot antenna is proposed. Broadband operation is achieved by designing an adjacent semicircular slot to a folded-slot antenna. A prototype antenna was fabricated on RO4003 (er = 3.38, substrate thickness = 1.5 mm) and measured for VSWR characteristics. The antenna can operate in the 4–6-GHz frequency range and has a bandwidth of 42.8% within 2:1 VSWR. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 32–37, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20037