A high‐gain and low cross‐polarized printed fractal antenna for X‐band wireless application

Abstract

Summary This paper presents a newly introduced fractal microstrip patch antenna for X‐band wireless application. The proposed fractal printed antenna possesses a fourfold centrosymmetric structure and gives considerably high gain with relatively low cross‐polarization along the entire half‐power beamwidth (HPBW) region of its radiation pattern. The proposed structure has been derived through selectively etching intersection parts between 4 symmetric lens and 13 circle geometries. In order to resonate the structure as well as to reduce the cross‐polarization, three diagonal slots have been etched from its ground plane. The fabricated prototype resonates at 8.49 GHz and gives a gain and impedance bandwidth of 6.98 dBi and 494 MHz, respectively. The measured cross‐polarization of the antenna along the direction of the main beam is −34.28 dB. The measured radiation efficiency and the computed aperture efficiency of the prototype are 91.96 % and 78.25 % , respectively. The fabricated prototype shows a very good agreement between its simulated and measured results and hence is a suitable candidate for X‐band‐related wireless applications.