Bandwidth enhanced compact fractal antenna for UWB applications with 5–6 GHz band rejection. Issue 3 (March 2015) - Rajeshkumar, V.
ABSTRACT A compact microstrip fed novel U‐shaped fractal monopole antenna with enhanced bandwidth and band notched characteristics is presented for ultrawideband applications. The self‐similar fractal property is used in the U‐shape monopole to obtain 2n surface current paths to achieve good impedance matching over a wider bandwidth. A parametric study is performed to optimize the crucial antenna parameters. The proposed fractal antenna exhibits wider impedance bandwidth from 2 to 13.7 GHz for VSWR ≤ 2. By increasing the number of fractal iterations to three (n = 3), wider bandwidth of about 149% (impedance bandwidth ratio 6.85:1) is achieved with 43% improvement in impedance bandwidth. By etching a novel complementary split ring resonator in the ground plane, the stop band for wireless local area network and HIPERLAN/2 (5.15–5.825 GHz) system is obtained. The total volume of the presented antenna is 20 × 20 × 1.0 mm3 and the simulated and measured antenna characteristics are in good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:607–613, 2015