mmWave Measurement of RF Reflectors for 5G Green Communications

In recent years, with the energy consumption and environmental degradation, science and technology embarked on a path of sustainable development. In this situation, 5G green communication system has been widely used. This paper introduces the application of RF reflectors to 5G mmWave, where line-of-sight (LoS) blockage is a major hindrance for the coverage. In particular, we investigate the lab measurement of RF reflectors, which is a critical step from the theory to the practice. Furthermore, through the lab measurement, a 3D near-field range migration (RM) imaging algorithm for MIMO array configuration is proposed, and the sampling scheme is improved to save the computation time while providing high-quality images.

Download Full-text

Research on the Dot-by-dot Imaging Algorithm for Multi-beam SAS Based on a New Array Configuration

JOURNAL OF ELECTRONICS INFORMATION TECHNOLOGY ◽

10.3724/sp.j.1146.2010.00730 ◽

2011 ◽

Vol 33 (4) ◽

pp. 838-843 ◽

Cited By ~ 1

Author(s):

Yong-hong Yao ◽

Tian Zhou ◽

Hai-sen Li ◽

Jian Xu

Keyword(s):

Imaging Algorithm ◽

Array Configuration

Download Full-text

Recent Advances in Antenna Pattern Measurement at Millimetre Wave Frequencies in a Spherical Near-field Range

Loughborough Antennas & Propagation Conference 2018 (LAPC 2018) ◽

10.1049/cp.2018.1451 ◽

2018 ◽

Cited By ~ 1

Author(s):

Z. Tian ◽

S.F. Gregson ◽

D.G. Gentle

Keyword(s):

Near Field ◽

Antenna Pattern ◽

Field Range ◽

Millimetre Wave ◽

Recent Advances

Download Full-text

Coherent suppression of backscattering in optical microresonators

Light Science & Applications ◽

10.1038/s41377-020-00440-2 ◽

2020 ◽

Vol 9 (1) ◽

Author(s):

Andreas Ø. Svela ◽

Jonathan M. Silver ◽

Leonardo Del Bino ◽

Shuangyou Zhang ◽

Michael T. M. Woodley ◽

...

Keyword(s):

Quality Factor ◽

Bulk Material ◽

Near Field ◽

High Quality Factor ◽

Dual Frequency ◽

High Quality ◽

Frequency Combs ◽

Optical Microresonators ◽

Whispering Gallery ◽

The Stability

AbstractAs light propagates along a waveguide, a fraction of the field can be reflected by Rayleigh scatterers. In high-quality-factor whispering-gallery-mode microresonators, this intrinsic backscattering is primarily caused by either surface or bulk material imperfections. For several types of microresonator-based experiments and applications, minimal backscattering in the cavity is of critical importance, and thus, the ability to suppress backscattering is essential. We demonstrate that the introduction of an additional scatterer into the near field of a high-quality-factor microresonator can coherently suppress the amount of backscattering in the microresonator by more than 30 dB. The method relies on controlling the scatterer position such that the intrinsic and scatterer-induced backpropagating fields destructively interfere. This technique is useful in microresonator applications where backscattering is currently limiting the performance of devices, such as ring-laser gyroscopes and dual frequency combs, which both suffer from injection locking. Moreover, these findings are of interest for integrated photonic circuits in which back reflections could negatively impact the stability of laser sources or other components.

Download Full-text