A Metasurface-Inspired Antenna in L-Band Using Defected Ground Structure (DGS)

In this paper, an antenna incorporating defective ground structure (DGS) has been proposed to integrate with metasurface (MS)-inspired layer, which simply acts as a band pass filter, to achieve significant improvements in radiation efficiency, gain, and radiation pattern. The MS-inspired layer consists of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2 \times 2$</tex> patch array with ring-shaped slot to exhibit passband feature. The antenna cantains of a conventional patch with defective ground structure (DGS). The patch of the antenna is etched by seven rectangular slots towards the edge of the width of the patch. A peak return loss (RL) of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{3 7. 8 0 ~ d B}$</tex> at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{1. 4 6}$</tex> GHz and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$-10-\text{dB}$</tex> impedance bandwidth (BW) of 50 MHz has been observed, which shows enhanced impedance matching because of the superstrate layer inspired by MS design. Additionally, a realized gain of 6 dBi and radiation efficiency (RE) of 74.50 % at 1.46 GHz has been achieved. The presented antenna is highly suitable for modern wireless communication in L-band.