Mingzheng Chen

Mingzheng Chen
KTH Royal Institute of Technology | KTH · Electromagnetic Engineering Lab (ETK)

Master of Engineering

About

44
Publications
17,574
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1,301
Citations

Publications

Publications (44)
Article
Full-text available
Recent progress in space‐time‐coding digital metasurface (STCM) manifests itself a powerful tool to engineer the properties of electromagnetic (EM) waves in both space and time domains, and greatly expands its capabilities from the physical manipulation to information processing. However, the current studies on STCM are focused under the synchrony...
Preprint
In the past years, wireless communications based on digital coding metasurfaces have gained research interests owing to the simplified architectures and low costs. However, in most of the metasurface-based wireless systems, single-polarization scenario is used, limiting the channel capacities. To solve the problem, multiplexing methods have been ad...
Article
Full-text available
Recently, the time‐domain sputtering effect has been discovered when the low‐scattering objects (LSOs) are illuminated by radar pulse signals. It results in large and sharp peaks at the beginning and end of the reflected waveforms, and presents a great challenge for them in stealth applications. To tackle that problem, herein, the sputtering effect...
Article
Full-text available
Metasurfaces are artificially engineered two‐dimensional materials composed of sub‐wavelength meta‐atoms, which have shown unprecedented capabilities in manipulating the amplitude, phase, frequency, and polarization states of electromagnetic waves. Specifically, polarization control can be attained via suitable anisotropic, linear, and time‐invaria...
Article
Full-text available
We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface (TDCM). Using the proposed mechanism and coding strategy, we design and fabricate a millimeter-wave (mmWave) TDCM, which is compos...
Article
Multiple-input multiple-output (MIMO) signaling is one of the key technologies of current mobile communication systems. However, the complex and expensive radio frequency (RF) chains have always limited the increase of MIMO scale. In this paper, we propose a MIMO transmission architecture based on a dual-polarized reconfigurable intelligent surface...
Preprint
Multiple-input multiple-output (MIMO) signaling is one of the key technologies of current mobile communication systems. However, the complex and expensive radio frequency (RF) chains have always limited the increase of MIMO scale. In this paper, we propose a MIMO transmission architecture based on a dual-polarized reconfigurable intelligent surface...
Preprint
Channel reciprocity greatly facilitates downlink precoding in time-division duplexing (TDD) multiple-input multiple-output (MIMO) communications without the need for channel state information (CSI) feedback. Recently, reconfigurable intelligent surfaces (RISs) emerge as a promising technology to enhance the performance of future wireless networks....
Article
Full-text available
Digitally programmable metasurfaces are of potential use in wireless multiplexing techniques because they can encode and transmit information without using traditional radio-frequency components such as antennas or mixers. Space–time-coding digital metasurfaces can, in particular, manipulate the propagation direction and harmonic power distribution...
Article
Metasurface has great capabilities in tailoring the electromagnetic (EM) waves in a controllable way owing to the carefully designed and arranged subwavelength meta-atoms. In this review paper, the digital version of metasurface, information metasurface (IM), is systematically introduced with its application in wireless communications. IM extends t...
Preprint
Full-text available
Reconfigurable intelligent surfaces (RISs) provide an interface between the electromagnetic world of the wireless propagation environment and the digital world of information science. Simple yet sufficiently accurate path loss models for RISs are an important basis for theoretical analysis and optimization of RIS-assisted wireless communication sys...
Article
Polarization Synthesis A general polarization regulation scheme based on anisotropic time‐domain digital coding metasurface is proposed by Qiang Cheng, Shi Jin, Tie Jun Cui, and co‐workers in article number 2000060. Both linear and nonlinear polarization syntheses and their real‐time programmable controls can be achieved, which offers a new approac...
Article
Full-text available
Metasurfaces have developed rapidly in the past decade because their customizable properties are able to regulate wave-matter interaction over a subwavelength scale. Recently, the space-time modulated metasurfaces have attracted significant attention for the additional degree of freedom they offer in the manipulation of the electromagnetic waves in...
Article
Full-text available
Spatial polarization converter can shift the polarization state of incident wave to another state in a specific frequency band. The traditional polarization conversion devices mainly include natural materials and artificial electromagnetic (EM) structures, which are generally sensitive to the incident polarization states and cannot realize polariza...
Article
Full-text available
Reconfigurable intelligent surfaces (RISs) comprised of tunable unit cells have recently drawn significant attention due to their superior capability in manipulating electromagnetic waves. In particular, RIS-assisted wireless communications have the great potential to achieve significant performance improvement and coverage enhancement in a cost-ef...
Article
We propose a low-profile broadband planar circularly polarized folded transmitarray antenna (CPFTA) based on welldesigned top and bottom metasurfaces (MSs). The top MS is employed to reflect the x-polarized wave as a ground, and at the same time convert the y-polarized wave to circularly-polarized waves with arbitrary phase shifts in the operation...
Article
Reconfigurable intelligent surface (RIS) is a new paradigm that has great potential to achieve cost-effective, energy-efficient information modulation for wireless transmission, by the ability to change the reflection coefficients of the unit cells of a programmable metasurface. Nevertheless, the electromagnetic responses of the RISs are usually on...
Article
Full-text available
A dispersive delay structure, or phaser, is an integral part of analogue signal processor. A phaser is a circuit, whose group delay can be engineered to obtain the desired response as a function of frequency. Traditionally, phasers have been implemented in circuits or waveguide structures, but they can never deal with electromagnetic waves in free...
Preprint
Space-time modulated metasurfaces have attracted significant attention due to the additional degree of freedom in manipulating the electromagnetic (EM) waves in both space and time domains. However, the existing techniques have limited wave control capabilities, leading to just a few feasible schemes like regulation of only one specific harmonic. H...
Article
A new design of a space‐time‐coding digital metasurface for high‐efficiency spatial synthesis is proposed by Qiang Cheng, Shi Jin, Tie Jun Cui, and co‐workers, in article number 1900133. By employing linear phase modulation to the metasurface, both frequency conversion and beam shaping are implemented simultaneously with the maximum conversion effi...
Article
Full-text available
Space‐time modulated metasurfaces enable efficient manipulations of nonlinear harmonics with more degrees of freedom than conventional materials by simply controlling the element geometries and modulation signals. The theoretical analyses reveal that a group of harmonics in reflected waves could be generated by the metasurface under the incidence o...
Conference Paper
By the ability to periodically change the reflection coefficients of the unit cells of the reconfigurable intelligent surface (RIS), RIS-empowered wireless transmitter has emerged as an attractive paradigm that can achieve information modulation and transmission in a cost-effective and energy-efficient manner. However, only the phase electromagneti...
Article
Various emerging technologies, such as UM-MIMO, THz communications are under active discussion as promising technologies to support the extremely high access rate and superior network capacity in the future 6G mobile communication systems. However, such technologies are still facing many challenges for practical implementation. In particular, UM-MI...
Article
Full-text available
Time-domain digital coding metasurfaces have been proposed recently to achieve efficient frequency conversion and harmonic control simultaneously; they show considerable potential for a broad range of electromagnetic applications such as wireless communications. However, achieving flexible and continuous harmonic wavefront control remains an urgent...
Preprint
Full-text available
Reconfigurable intelligent surface (RIS) is a new paradigm that has great potential to achieve cost-effective, energy-efficient information modulation for wireless transmission, by the ability to change the reflection coefficients of the unit cells of a programmable metasurface. Nevertheless, the electromagnetic responses of the RISs are usually on...
Article
Full-text available
Recently, investigation of metasurface has been extended to nonreciprocity through breaking time‐reversal symmetry. Among a number of magnetless strategies, nonlinearity is an important nonreciprocal principle amenable to the metasurface. As passive analog‐based devices, most of the existing nonlinear nonreciprocal metasurfaces are inherently chara...
Article
Full-text available
Metasurfaces are well-designed artificial periodic or quasi-periodic structures to achieve customized electromagnetic responses. Based on the time-domain digital coding metasurface (TDCM) with dynamic reflection or transmission characteristics, one can realize direct information modulation on the metasurface, which has been used in wireless communi...
Preprint
Full-text available
Reconfigurable intelligent surfaces (RISs) comprised of tunable unit cells have recently drawn significant attentions due to their superior capability in manipulating electromagnetic waves. In particular, RIS-assisted wireless communications have the great potential to achieve significant performance improvement and coverage enhancement in a cost-e...
Preprint
Full-text available
Many emerging technologies, such as ultra-massive multiple-input multiple-output (UM-MIMO), terahertz (THz) communications are under active discussion as promising technologies to support the extremely high access rate and superior network capacity in the future sixth-generation (6G) mobile communication systems. However, such technologies are stil...
Article
A prototype of a time‐domain digital‐coding metasurface‐based wireless communication system is proposed by Qiang Cheng, Shi Jin, Tie Jun Cui, and co‐workers in article number 1900044. The metsurface directly modulates the baseband signal to the carrier wave, and a demonstration of their system shows that it can accommodate real‐time video transmiss...
Data
The processes of real-time video transmission through the proposed QPSK system are recorded in this Video. The experiment scene was set up in an office room to test the system performance in real scenario. A 480p (640×480) resolution video is successfully transmitted from the transmitting terminal to the receiving terminal with moderate data rate (...
Article
Full-text available
Tailoring the electromagnetic responses by metasurface greatly expands one's capabilities to manipulate light in a controlled manner. Either amplitude or phase of the incident wave can be altered during the light–matter interaction, and thus opens the possibility of information modulation without conventional analog or digital circuits. A prototype...
Preprint
Full-text available
In this letter, a wireless transmitter using the new architecture of programmable metasurface is presented. The proposed transmitter does not require any filter, nor wideband mixer or wideband power amplifier, thereby making it a promising hardware architecture for cost-effective wireless communications systems in the future. Using experimental res...
Article
Full-text available
In this Letter, a wireless transmitter using the new architecture of programmable metasurface is presented. The proposed transmitter does not require any filter, nor wideband mixer or wideband power amplifier, thereby making it a promising hardware architecture for cost-effective wireless communications systems in the future. Using experimental res...
Article
Full-text available
In the past few years, orbital angular momentum (OAM) has aroused great interest in the scientific communities, because it shows great potential for enhancing capacities of radio and optical communication systems. Here, we propose anisotropic metasurfaces to generate multiple OAM vortex beams at microwave frequencies. A phase compensation theory is...

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Projects

Projects (2)
Project
Functionalities and applications of STC digital metasurfaces in wireless communication
Project
Time-domain digital coding metasurface