Bandwidth enhanced compact fractal antenna for UWB applications with 5-6 GHz band rejection

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

A Review: Circuit Theory of Microstrip Antennas for Dual-, Multi-, and Ultra-Widebands

“…Zheng et al [95] investigated compact optically controlled UWB antenna with reconfigurable band-notched characteristics for cognitive radio (CR) applications. Rajesh Kumar and Raghavan [96] demonstrated a compact microstrip-fed novel U-shaped fractal monopole antenna with enhanced bandwidth and band-notched characteristics for ultra-wideband applications.…”

Design of miniaturized single band-notch micro strip antenna with enhanced UWB performance

“…Therefore, it is necessary to notch out portions of the band to avoid interference with existing wireless networking technologies. There are several methods with which one can achieve a band‐notched UWB antenna . The band‐notched property is achieved by etching two split‐ring resonator slots on the radiators respectively .…”

“…In Ref. , the stop band for wireless local area network and HIPERLAN/2 (5.15–5.825 GHz) system is obtained by etching a novel complementary split‐ring resonator in the ground plane. Ultrawide bandwidth is obtained by using a star like‐shaped radiator and a defected rectangular ground plane and band‐notched functions are obtained by attaching L‐ and I‐shaped structure on the ground and a capacitive‐loaded loop (CLL) resonator on the patch .…”

Design of an Uwb Antenna With Adjustable Rejection Bandwidth Using Novel Dual-T Square Resonator

“…Additionally, embedding slots in radiating patch or in ground plane [9][10][11][12][13][14] is a effective method to obtain band-rejection characteristic. Bandwidth enhanced antennas [15,16] are also be researched. In [15], wider impedance bandwidth is obtained by using the tridentshaped feed line.…”

“…In [15], wider impedance bandwidth is obtained by using the tridentshaped feed line. By increasing the number of fractal iterations to three wider bandwidth is achieved [16]. However, most of the structures in these UWB antennas have been designed with one pole at one rejection bandwidth, and the bandrejection is not adjustable.…”