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

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 (εr = 9.32), quality factor (Q f = 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.

Phase transitions and microwave dielectric behaviors of the (Bi1−xLi0.5xY0.5x)(V1−xMox)O4 ceramics

“…The similar change trend was also found in other BiVO 4 ‐based monoclinic scheelite solid‐solution ceramics, 24,25 and the peak value of permittivity at boundary composition x = 0.1 was ascribed to the minimum value of cell volume. When x value becomes larger than 0.1, the linear decrease in permittivity could be attributed to the smaller equivalent molecular polarizability of (Li 0.5 Y 0.5 )MoO 4 (13.82 Å 3 ) than that of BiVO 4 (17.08 Å 3 ). 34 Permittivities of all the compositions first increased with the sintering temperature and then reached saturated values.…”

“…Microwave dielectric ceramics have been studied for more than half a century since they were found to effectively reduce the dimensions of resonant cavity due to the large permittivity and low dielectric loss in 1970s 1–8 . Nowadays, microwave dielectric ceramics have been widely used as capacitors, dielectric resonators, filters, substrates, and so on in modern microwave devices 7–12 .…”

Optical transmission, dispersion, and transition behavior of ZnGa2O4transparent ceramic

“…Recently, the high optical quality ZnGa 2 O 4 transparent ceramic has been successfully fabricated 1 . The microstructural characteristics of transparent ceramics with few pores, high density, and no second phase could also minimize the influence of external factors on the optical properties 6,7 . Therefore, a meaningful purpose of the current work is to obtain a complete set of detailed experimental optical data, including refractive index, extinction coefficient, optical transmittance, band gap, Abbé number, and phonon frequency.…”

Microwave dielectric properties of (0.75ZnAl2O4–0.25TiO2)–MgTiO3 ceramics prepared using digital light processing technology

“…With the rapid development and commercialization of 5G communication technology, the demand for microwave dielectric ceramics is increasing 1–3 . To realize antennas with high integration, microwave components should feature complex structures, functional integration, and ultralow power consumption 4,5 .…”

“…With the rapid development and commercialization of 5G communication technology, the demand for microwave dielectric ceramics is increasing. [1][2][3] To realize antennas with high integration, microwave components should feature complex structures, functional integration, and ultralow power consumption. 4,5 Microwave dielectric ceramics with a low dielectric constant possess a moderate dielectric constant, a high quality factor, and adequate temperature stability.…”