Miniature Millimeter-Wave 5G Antenna Fabricated Using Anodized Aluminum Oxide for Mobile Devices

Jongsun Choi; Jaehyun Choi; Woonbong Hwang

doi:10.1021/acsomega.0c03795

Miniature Millimeter-Wave 5G Antenna Fabricated Using Anodized Aluminum Oxide for Mobile Devices

ACS Omega. 2020 Oct 5;5(40):26206-26210. doi: 10.1021/acsomega.0c03795. eCollection 2020 Oct 13.

Authors

Jongsun Choi¹, Jaehyun Choi¹, Woonbong Hwang¹

Affiliation

¹ POSTECH Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea.

Abstract

A miniature millimeter-wave 5G antenna fabricated using anodized aluminum oxide (AAO) is devised and demonstrated for mobile devices. The proposed structure creates a dielectric layer on an aluminum plate using AAO topology and allows the antenna pattern to be placed on the dielectric layer. The proposed AAO-based antenna reduces the size (1.87 (0.18λ₀) mm × 2.34 (0.22λ₀) mm) of the antenna in proportion to the dielectric constant (ε_r = 6.7), which is higher than those of the conventional materials such as polycarbonates (PC) or a flame retardant (FR4). In addition, it is possible to precisely control the dielectric layer dimensions and generate a dielectric layer on the metal substrate itself, which greatly increases the design freedom. As a result, the devised antenna resonates at 29 GHz, and the measured gain is 5.02 dBi.