A 300-GHz low-cost high-gain fully metallic Fabry–Perot cavity antenna for 6G terahertz wireless communications

Abstract

A low-cost, compact, and high gain Fabry–Perot cavity (FPC) antenna which operates at 300 GHz is presented. The antenna is fabricated using laser-cutting brass technology. The proposed antenna consists of seven metallic layers; a ground layer, an integrated stepped horn element (three-layers), a coupling layer, a cavity layer, and an aperture-frequency selective surface (FSS) layer. The proposed aperture-FSS function acts as a partially reflective surface, contributing to a directive beam radiation. For verification, the proposed sub-terahertz (THz) FPC antenna prototype was developed, fabricated, and measured. The proposed antenna has a measured reflection coefficient below − 10 dB from 282 to 304 GHz with a bandwidth of 22 GHz. The maximum measured gain observed is 17.7 dBi at 289 GHz, and the gain is higher than 14.4 dBi from 285 to 310 GHz. The measured radiation pattern shows a highly directive pattern with a cross-polarization level below − 25 dB over the whole band in all cut planes, which confirms with the simulation results. The proposed antenna has a compact size, low fabrication cost, high gain, and wide operating bandwidth. The total height of the antenna is 1.24 $${\lambda }_{0}$$ λ 0 ($${\lambda }_{0}$$ λ 0 at the design frequency, 300 GHz) , with a size of 2.6 mm × 2.6 mm. The proposed sub-THz waveguide-fed FPC antenna is suitable for 6G wireless communication systems.

Tunable Perfect Absorber of Graphene Metamaterial in the Terahertz Band and Its Sensing Properties

“…[1,2] As this band contains the physical, chemical, and structural information of the substance, terahertz technology has become a research hotspot in recent years, and has been widely applied in atmospheric monitoring, nondestructive testing, terahertz communication, and radar detection. [3][4][5] Owing to the unique advantages of terahertz-based metamaterial absorbers in energy harvesting, medical imaging, optical invisibility, and sensing, research on perfect absorbers has attracted extensive attention from researchers. [6][7][8][9] In particular, graphene has been receiving significant attention due to its high carrier mobility, remarkable optical properties, excellent mechanical properties, and adjustable electrical conductivity.…”

Effective terahertz shielding properties of extreme graphene-silver nanowire surfaces investigated by nanoprobing

“…The THz-integrated technology has emerged as a promising technology for various applications, such as wireless communication ( Yang et al., 2020b ), nondestructive detection ( Kato et al., 2016 ), biomedical sensing ( Lee et al., 2020a ; 2020b ), imaging ( Stantchev et al., 2020 ), spectroscopy ( Choi et al., 2019b ), and security ( Federici et al., 2005 ; Gui et al., 2019 ). Recently, the THz band has gained attention as a nondestructive security system and intrachip/interchip communication as a high-speed connection, because it is harmless and uses non-ionizing radiation ( Aqlan et al., 2021 ; Liang et al., 2015 ). In particular, sub-THz frequencies (100 GHz–1 THz) constitute the next-generation wireless communication network band according to the rapid growth of Internet technology and demands of broad bandwidth and ultrahigh data rates, up to terabits per second, over long distances ( Rappaport et al., 2019 ; Zhang et al., 2019 ).…”

Metamaterial Structure Based Dual-Band Antenna for WLAN

“…And almost all terminal devices are optimized for miniaturization. Therefore, the demands for compact [14], [15], low-cost [16], [17], light weight [18] and multiband antennas [19]- [21] are increasing. With the rapid development of microstrip circuits [22], [23], a coplanar waveguide circuit [24]- [26] is proposed for the miniaturization of the antennas.…”