Fractal Patch Antenna with Exalted Bandwidth and Harmonic Suppression for WiMAX Applications

摘要

Here, a compact and single-layer fractal patch antenna is proposed, having potential of bandwidth enhancement and harmonic rejection. For achieving these two crucial factors, a pair of quarter wavelength microstripline resonator is instigate and coupled in proximity to a rectangular patch. Miniaturization is explored by Koch slot to radiating edge of the reference antenna through its symmetry plan. The broadband property can be obtained by making partial ground and coupled radiating λ/4 resonators. This antenna is having a low-profile property since it does not need electrically thick substrate. Harmonic suppression-the necessity of highly advanced communication systems has achieved with aid of good aspects of λ/4 resonators and partial ground scheme. The antenna has been designed on FR4 substrate having dielectric constant 4.4 with an overall dimension of 34 mm * 36 mm * 1.5 mm. The substrate has thickness of 1.5 mm. According to simulated results, fractal patch antenna achieves good impedance matching over operating bandwidth 2.52-4.27 GHz (52.09%). Thus, it covers Wi-MAX 3.30-3.70 GHz band. Finally, an antenna operating at 3.5 GHz is designed on HFSS software operating at wide impedance bandwidth of 1752 MHz (see the below comparison table) and effectively wipe out higher order radiating modes up to fourth harmonics of fundamental frequency.