2022 年 15 巻 p. E22-001-1-E22-001-7
Dielectric-metal-dielectric (DMD) films exhibit high optical transmittance and conductivity. In recent years, the application of these DMD materials to antennas has been actively investigated. However, the radiation efficiency of these antennas is less than 70%, so their performance as antennas remains a challenge. This study investigated the optical and electrical properties of indium tin oxide (ITO)/Ag/ITO, and a basic structural monopole antenna was fabricated and measured. As a result, the optical transmittance of 76.7% and radiation efficiency of 81.4% were achieved by using ITO (300 nm)/Ag (5 nm)/ITO (30 nm) as the DMD film. In particular, the obtained radiation efficiency was higher than that of small antennas built into standard mobile and wearable devices, which have excellent characteristics, practicality, and usefulness.
