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Quangui He,Jia Zhuang,Qiuxiang Wen,Yang Deng,Jun Yu,Haimin Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6
An anatase TiO2 photoanode with a novel three-dimensional nest-like structure was prepared directly on a transparent conductive glass substrate through hydrothermal cycles by three times. First, an unidirectional banded structure film was prepared by a facile hydrothermal method. And then, with the time of hydrothermal cycle increased, part of nanobelts were ruptured into a lot of small polyhedrons, but they still maintained a trend of the previous connection, and some fine nanobelts were interweaved in small polyhedrons. Finally, we successfully prepared a film with a novel 3D nest-like structure, and it had all the characteristics of the hierarchitectures. It had better photoelectric properties than the film with fewer times of hydrothermal cycle. Its photoelectric conversion efficiency reached 3.81%, which is due to a large dye adsorption amount, rapid electronic transmission, and superior light scattering and more electrons transmission paths.
A Dual-Band Dual-Polarized Antenna for Small Base Station Applications
Cao Rong,Sim Chow-Yen-Desmond,Zhuang Jia-He 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
This paper proposes a dual-band dual-polarized antenna which can operate at both the 1.71–2.69 GHz band (3G/4G band) and the 3.3–3.8 GHz band (5G NR band 78). The main radiator (crossed dipoles) is meticulously designed to obtain the two desired bands of interest, and the fan-shaped feeding structures are used to obtain good impedance matching. The measured low band and high band operations was 49.8% (1.69–2.81 GHz, VSWR ≤ 1.5) and 14.8% (3.32–3.85 GHz, VSWR ≤ 2), respectively. The measurement results also show that this antenna has good isolation, stable radiation pattern, and good XPD.