Octahedron-Shaped Linearly Polarized Antenna for Multistandard Services Including RFID and IoT

Abstract

In this paper, a novel topology of the coplanar waveguide fed truncated octahedron-shaped antenna is proposed. The linearly polarized antenna operates over the triple radio frequency identification technique (RFID) bands of 858–930MHz, 2.4–2.454 GHz, and 5.725–5.875 GHz at ultrahigh frequency (UHF), microwave-, and super high-frequency bands, respectively. In addition, it also supports long-term evolution 4G, TV broadcasting, and 5G bands of the electromagnetic spectrum. The <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S_{11} = -10$ </tex-math></inline-formula> dB impedance bandwidth is 294 MHz (697–991 MHz), 120 MHz (2.38–2.5 GHz), 310 MHz (3.07–3.35 GHz), and 310 MHz (5.61–5.92 GHz) in the various bands. The antenna is fabricated on a polyguide substrate of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.3023\lambda _{L}\times 0.209\lambda _{L }\times 0.014\lambda _{L}$ </tex-math></inline-formula> dimension, where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{L}$ </tex-math></inline-formula> is the free-space wavelength at the lowest operating frequency. The antenna’s <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S_{11}$ </tex-math></inline-formula> and the radiation patterns have been measured, and a good agreement between simulated and the measured results has been found. In addition, the proposed antenna is also experimentally verified for the UHF band RFID detection and the global standard for mobile communications 900 band cellular applications. We also propose a system-level schematic to integrate this antenna to other communication standards for the automated RFID applications needed for the Internet of Things.