High-Quality-Factor AlON Transparent Ceramics for 5 GHz Wi-Fi Aesthetically Decorative Antennas

Chao Du; Di Zhou; Shu-Zhao Hao; He-Tuo Chen; Jian Zhang; Shi-Kuan Sun; Tao Zhou; Ming-Zhao Dang; Shao-Fei Wang; Hai-Wen Liu; Long Li; Zhuo Xu

doi:10.1021/acsami.1c12223

High-Quality-Factor AlON Transparent Ceramics for 5 GHz Wi-Fi Aesthetically Decorative Antennas

ACS Appl Mater Interfaces. 2021 Oct 6;13(39):46866-46874. doi: 10.1021/acsami.1c12223. Epub 2021 Sep 24.

Authors

Chao Du¹, Di Zhou¹, Shu-Zhao Hao¹, He-Tuo Chen^{2

3}, Jian Zhang^{2

3}, Shi-Kuan Sun⁴, Tao Zhou⁵, Ming-Zhao Dang⁶, Shao-Fei Wang⁷, Hai-Wen Liu⁷, Long Li⁸, Zhuo Xu¹

Affiliations

¹ Multifunctional Materials and Structures, Key Laboratory of the Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
² State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
³ CAS Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China.
⁴ School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong 528000, China.
⁵ School of Electronic and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
⁶ Guangdong Fenghua Advanced Technology Holding Co., Ltd, Zhaoqing, Guangdong 526000, China.
⁷ School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
⁸ School of Electronic Engineering, and the Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi'an 71007, China.

PMID: 34559512
DOI: 10.1021/acsami.1c12223

Abstract

Transparent material has been widely used in product design and has seen a large increase in its use. In this paper, a kind of aesthetically decorative 5 GHz Wi-Fi dielectric resonator antenna (DRA) of aluminum oxynitride (AlON) transparent ceramic has been designed. High-quality-factor AlON transparent dielectric ceramics were fabricated by presintering at 1780 °C and further cold isostatic pressing (CIP) under a 200 MPa argon atmosphere. For a 9.0 mm thick specimen, the in-line light transmittance reached 83%. Optimum dielectric constant (ε_r = 9.32), quality factor (Qf = 47 960) and temperature coefficient (TCF = -51.7 ppm/°C) was achieved in the AlON transparent ceramic by cold isostatic pressing. As a result, the proposed aesthetically decorative DRA can achieve an impedance bandwidth of 32% (4.48-6.19 GHz), a high radiation efficiency of 85%, and a low cross-polarization discrimination (XPD) of -30 dB. To achieve a broad bandwidth, the proposed antenna was excited in its dominant TE₁₁₁^x mode and higher-order TE₁₁₃^x mode. The proposed antenna is thus an excellent candidate for an indoor decoration Wi-Fi antenna.

Keywords: aesthetically decorative; dielectric resonator antenna; indoor Wi-Fi; microwave dielectric ceramics; transparent ceramics.