This article presents the compact planar antenna with 3.5/5.5/8.2 GHz triple band-notched characteristics. The antenna consists of an octagon shape patch with 50 Ω transmission line. By etching two C-shaped slots in the patch and adding pair of L-shaped resonator coupled to the radiating patch, band-rejected filtering properties in the WiMAX/WLAN/ITU bands are achieved. The proposed ultrawide band (UWB) antenna is optimized to operate in the frequency band from 3 to 11 GHz for VSWR < 2. Measured results confirm that the antenna is suitable for UWB applications because of its compact size and high performance.
Dr. Natarajamani S., Behera, S. K., and Patra, S. K., “A triple band-notched planar monopole antenna for ultra-wide band applications”, Microwave and optical technology letters (Willey Publication), vol. 54, no. 2, pp. 539–543, 2011.