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139 results on '"Wang, Shao-Fei"'

3. A large-aperture, high-power ultrawideband radiation system with beam broadening capacity.

Author

Zhang, Pu-qing, Xie, Yan-zhao, Wang, Shao-Fei, Qiu, Yang-xin, Zhu, Kai-yuan, Zhang, Yang-shuo, Wu, Qing-yu, Wang, Zi-rui, and Yuan, Yi-zhou

Abstract

Due to the limited maximum output power of the pulsers based on avalanche transistors, high-power ultrawideband (UWB) radiation systems usually synthesize plenty of modules simultaneously to achieve a high peak effective potential (rEp). However, this would lead to an increased aperture size as well as a narrower beam, which would limit their applications in intentional electromagnetic interference fields. In this paper, a high-power UWB radiation system with beam broadening capacity is developed. To achieve beam broadening in the time domain, a power-law time delay distribution method is proposed and studied by simulation, and then the relative excitation time delays of the modules are optimized to achieve higher rEp and avoid beam splitting in the beam broadening mode. In order to avoid false triggering of the pulser elements when implementing the beam broadening, the mutual coupling effect in the system is analyzed and suppressed by employing onboard high-pass filters, since the mutual coupling effect is much more severe in the low-frequency range. Finally, a radiation system with 36 modules is developed. Measuring results indicate that in the high-rEp mode, the developed system could achieve a maximum effective potential rEp of 313.6 kV and a maximum pulse-repetition-rate of 20 kHz. In the beam broadening mode, its half-peak-power beam width in the H-plane is broadened from the original value of 3.9° to 7.9°, with a maximum rEp of 272.9 kV. The polarization direction of the system could be flexibly adjusted by a built-in motor. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Fabrication of High Radiation Efficiency Dielectric Resonator Antenna Array Using Temperature Stable 0.8Zn 2 SiO 4 ‐0.2TiO 2 Microwave Dielectric Ceramic

Author

Du, Chao, primary, Li, Xiang‐Kun, additional, Zhou, Di, additional, Wang, Shao‐Fei, additional, Li, Rui‐Tao, additional, Yao, Xiao‐Gang, additional, Lin, Hui‐Xing, additional, Peng, Hai‐Yi, additional, Zhou, Tao, additional, Sun, Shi‐Kuan, additional, Xia, Song, additional, and Xu, Zhuo, additional

Published
2023
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15. Fabrication of High Radiation Efficiency Dielectric Resonator Antenna Array Using Temperature Stable 0.8Zn2SiO4‐0.2TiO2 Microwave Dielectric Ceramic.

Author

Du, Chao, Li, Xiang‐Kun, Zhou, Di, Wang, Shao‐Fei, Li, Rui‐Tao, Yao, Xiao‐Gang, Lin, Hui‐Xing, Peng, Hai‐Yi, Zhou, Tao, Sun, Shi‐Kuan, Xia, Song, and Xu, Zhuo

Subjects
DIELECTRIC resonator antennas, ANTENNA arrays, MOBILE communication systems, MICROWAVE heating, CERAMICS, TELECOMMUNICATION systems, DIELECTRIC properties
Abstract

Array antenna is of great significance in realizing the Sub‐6 GHz fifth‐generation (5G) mobile communication systems, however, its utilization in the base station systems implementation is limited due to high power consumption. In this paper, a high radiation efficiency 4 × 4 cylindrical dielectric resonator antenna (CDRA) array fabricated using the temperature stable 0.8Zn2SiO4‐0.2TiO2 composite ceramic is proposed. TiO2‐doped Zn2SiO4 composite ceramics are synthesized by the conventional solid‐state method. Notably, 0.8Zn2SiO4‐0.2TiO2 composite ceramic sintered at 1250 °C demonstrates excellent microwave dielectric properties with dielectric constant (εr ≈ 8.24), high‐quality factor (Q × f ≈ 35 000@8.08GHz), and the temperature coefficient of resonant frequency (TCF ≈ +4.6 ppm °C−1). Moreover, the composite ceramic CDRA array is designed by exciting fundamental HE11δ mode using the aperture coupling microstrip feeding network. The fabricated composite ceramic based 4 × 4 CDRA array has enhanced measured radiation efficiency of up to 87%, high gain of 17.85 dBi and is a promising candidate for utilization in Sub‐6 GHz 5G Base Station communications systems. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Dielectric resonator antenna with Y3Al5O12 transparent dielectric ceramics for 5G millimeter‐wave applications.

Author

Du, Chao, Fu, Mao‐Sen, Zhou, Di, Guo, Huan‐Huan, Chen, He‐Tuo, Zhang, Jian, Wang, Jun‐Ping, Wang, Shao‐Fei, Liu, Hai‐Wen, Liu, Wen‐Feng, Li, Long, and Xu, Zhuo

Subjects
DIELECTRIC resonator antennas, TRANSPARENT ceramics, MOBILE communication systems, DIELECTRIC resonators, 5G networks, DIELECTRIC materials, ISOSTATIC pressing
Abstract

Microwave dielectric ceramics are considered to be one of the key materials for dielectric resonators (DR) and have very broad application prospects in the fifth generation (5G) mobile communication system. Here we have prepared high‐quality factor Y3Al5O12 (YAG) transparent dielectric ceramics using high‐purity α‐Al2O3 and Y2O3 powders by cold isostatic pressing of the vacuum sintered with tungsten meshes as the heating elements. Optimum relative permittivity (εr) ~10.53, quality factor Q × f (Q = 1/dielectric loss, f = resonant frequency) ~95, 270 GHz (at =7.37 GHz), and temperature coefficient of resonant frequency (TCF) ~ −51.7 ppm °C−1 were obtained at a sintering temperature of 1780°C for 12 h. For the first time, YAG transparent ceramic dielectric resonator antenna (DRA) is designed as a dominant TE111y mode and a higher‐order TE113y mode using the aperture coupling feeding configuration excitation. The proposed transparent dielectric ceramic DRA can provide a broad impedance bandwidth of 4.193 GHz (ranging from 21.90 to 26.09 GHz) for S11 < −10 dB, radiation efficiency of 92.1%, and compact DR unit. The proposed DRA can be used potentially as a 5G millimeter (mm)‐wave multiple‐input‐multiple‐output (MIMO) antenna unit. [ABSTRACT FROM AUTHOR]

Published
2021
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