Abstract-340-GHz 3-D Imaging Radar With 4Tx-16Rx MIMO Array

Binbin Cheng,  Zhenmao Cui, Bin Lu,  Yuliang Qin,  Qiao Liu,  Peng Chen,  Yue He,  Jun Jiang,   Xiaoyang He, Xianjin Deng, Jian Zhang, Liguo Zhu, 

https://ieeexplore.ieee.org/document/8404082/

A standoff 3-D imaging radar for security body scan at 340 GHz has been described. This terahertz imager incorporates a multiple input multiple output (MIMO) array as an electronic beam former in a horizontal dimension and an elliptic cylinder as a focusing reflector in elevation. Frequency-modulated continuous-wave (FMCW) emission with 16-GHz bandwidth caused a 10-mm-range resolution after calibration for nonlinearities of the distorted radar signals. The horizontal MIMO array contains 4 transmitters and 16 receivers (4Tx-16Rx) to generate a 64-Tx/Rx full virtual array corresponding to an antenna size of approximately 128 mm, which caused a horizontal resolution of about 14 mm at a distance of 3 m. FMCW signals were transmitted from the 4-Tx sequentially and focused as narrow beam lines by the elliptic reflector to get a 12-mm vertical resolution at 3 m. A fast-scanning mirror swings in the light path to make these beam lines screen in the vertical direction. A 4-Hz frame rate is now possible for a personal screen with a field of view of 2 m × 0.6 m.

Abstract-A 21 km 5 Gbps real time wireless communication system at 0.14 THz

Qiuyu Wu,  Changxing Lin, Bin Lu, Li Miao, Xin Hao,  Zhaohui Wang,   Yi Jiang, Wenqiang Lei,   Xianjing Den, Hongbin Chen, Jun Yao ,  Jian Zhang

http://ieeexplore.ieee.org/document/8066870/

A 0.14 THz wireless communication system that can transmit data with bit rate of 5 Gbps in real time over more than 21 km is developed. Solid-state power amplifier and vacuum electronic amplifier are cascaded to achieve nearly watts output power. An all solid-state receiver running in room temperature with equivalent noise temperature of 1100 K is used. An experiment over 21 km is carried out with two 49.5 dBi antennas and measured bit error rate is bellow 10-12. Two uncompressed HD-SDI video streams are successfully transmitted in real time. The feasibility of terahertz wave applied in long range wireless communication and well penetrability through heavy haze is also demonstrated in this work.

Abstract-Practical dual-band terahertz imaging system

Deliang Zhou, Liwei Hou, Wei Xie, Yuanzhang Zang, Bin Lu, Jian Chen, and Peiheng Wu

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-11-3148

This paper introduces a dual-band terahertz imaging system as a potential product for nondestructive testing using heterodyne detectors and continuous-wave sources. The operating frequencies of the system are 110.4 and 220.8 GHz. Multiband fusion technology combines the advantages of the greater spatial resolution of the high-frequency band and the enhanced sensitivity of the low-frequency band to improve the detection ability of the system. Additionally, the interference cancellation technology is used to obtain a superior image quality. The spatial resolution of this system was approximately 3 mm. The results show that the system can be used for bonding quality and embedded defect detection in radomes and foam materials adhered to metal plates in aircrafts.

© 2017 Optical Society of America