Printed band‐notched ultra‐wideband quasi‐dipole antenna

A printed ultra-wideband (UWB, 3.1–10.6 GHz) quasi-dipole antenna with the band-notched characteristic is presented. The antenna mainly comprises two radiating elements: an upper semi-circular disk and a lower semi-circular disk embedded with a pair of narrow slits, whose length is about one quarter-wavelength at the desired notched frequency. Both the upper and lower semi-circular disks are of the same dimensions, thus making the proposed antenna tend to be a dipole structure. With a compact size of 25 × 25 mm2, the proposed antenna showing UWB operation with a notched frequency band at 5 GHz is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 418–420, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21368