Design and characterization of mesoscopic dielectric cuboid antenna for operation in WR-3.4 waveguide bandwidth (220–330 GHz)

• Published in: Scientific reports 2023-09, Vol.13 (1), p.15552-15552, Article 15552
• Main Authors: Ohno, Towa, Yabuki, Ayumu, Inagaki, Keizo, Kanno, Atsushi, Nakajima, Junichi, Sekine, Norihiko, Hisatake, Shintaro
• Format: Article
• Language: English
• Subjects: 639/166/987; 639/766/1130; Antennas; Bandwidths; Humanities and Social Sciences; multidisciplinary; Prototypes; Science; Science (multidisciplinary)
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-023-42640-x

We designed a mesoscopic dielectric cuboid antenna connected to a flangeless WR-3.4 open-ended waveguide, and the antenna characteristics at 300 GHz were examined through simulations and experiments. Simulations confirmed that the flangeless design eliminated the flange-induced ripples in the radiation pattern, whose shape varied with frequency, and that the antenna operated in the full bandwidth of the WR-3.4 waveguide (220–330 GHz). Prototypes were then fabricated based on the simulation findings. A prototype with an antenna aperture area of 1.5 mm × 1.5 mm and an antenna length of 2.35 mm exhibited an antenna gain of 17.2 dBi at 300 GHz and a voltage standing wave ratio of less than 1.5 throughout the WR-3.4 waveguide bandwidth. The level of the side lobes at about ± 30 degrees in the E-plane pattern was approximately - 10 dB that of the main lobe. Therefore, the proposed antenna, connected to a flangeless waveguide, is a promising antenna for use in future short-range high-speed terahertz wireless applications such as kiosk downloads and board-to-board communication.