Abstract
A novel low-profile inset-fed ultrawideband printed antenna with triple band-notched characteristics is proposed. Wide inverted U-shaped and crescent-shaped slots are used to achieve first and second notched bands in the 3.3-3.7 GHz and 5.1-5.9 GHz ranges for WiMAX and WLAN systems, respectively. Additionally, an altered ground plane with an open-ended L-shaped slot generated a third notched band in the 7.25-7.85 GHz range for downlink of X-band satellite communication systems. The center frequencies of the stop bands are adjusted by altering the parameters of corresponding slots. The antenna prototype is built on a 28 mm x 24 mm Rogers RT/duroid 5880 (epsilon(r) = 2.2) substrate over a partial ground plane. Two concave circular curves were deployed on the patch with an inset feeding in order to obtain wideband performance in the 2.5-12 GHz (VSWR < 2) range with relatively good matching. The antenna prototype was fabricated and tested, and it was found to exhibit wideband performance, acceptable gain, and stable radiation pattern.