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Publications (155)
This paper proposes a time-varying parametric scattering model guided network that estimates the multidimensional parameters of group cone-shaped targets. Firstly, the time-varying parametric scattering model is extracted by an inverse parametric modeling method, which eliminates the false scattering centers (SCs), supplements the occluded SCs, and...
Non-contact target identification technology serves as a critical requirement for intelligent microwave sensing systems. In this article, we propose a novel electromagnetic (EM) tag for cooperative target identification based on a multi time-scale modulated metasurface (MTM-MTS). The modulation scheme of the metasurface involves pseudorandom modula...
This letter provides a forward parametric model to obtain strong coupling scattering from metallic cavities accurately. To evaluate the coupling scattering effectively, optical path difference equivalence method and parametric extraction are proposed. Firstly, the rays are transformed into 3-D equivalent reflection points during ray tracing based o...
Time-modulated metasurface can serve as a spoofing cloak partially covering on a static real target, thereby generating false targets in the High-Resolution Range Profile (HRRP) and making the real target undetectable. This paper proposes an Electronic Counter-CounterMeasures (ECCM) detection method to nullify the spoofing capabilities of time-modu...
This letter proposes a novel analysis and design methodology for angle-stable frequency selective surface (ASFSS) based on high-order modes modulation. The theory of characteristic mode (TCM) is introduced to expand these resonance properties into the modal space. The provided orthogonal eigen-solutions can effectively distinguish the high-order mo...
This article presents an accurate automatic forward parametric scattering model with bi-directional ray tracing (BRT) and attribute scattering center (ASC) for complex coated structure. The model can accurately reconstruct the radar cross section (RCS) characteristics and the synthetic aperture radar (SAR) image signatures of targets. Compared with...
The emergence of space-time modulated metasurface (STMM) as a novel platform for signal modulation holds significant promise for wireless secure communication, particularly within modern information technologies such as the Internet of things and 5G+. While previous secure communication methods based on STMM have primarily focused on ensuring infor...
A novel resonance model is formulated to evaluate the resonance properties of frequency-selective surfaces (FSSs) using characteristic modes (CMs). This CM-based resonance model, derived from the Poynting theorem, extends its application to accommodate reconfigurable frequency-selective surfaces (RFSSs) by integrating the equivalent circuit of diod...
In this paper, we propose a multifunctional time-modulated metasurface-enabled electromagnetic tag as a low-complexity, low-cost, and effective alternative for cooperative target recognition. The novel metasurface can execute reflection, absorption, and detection functions within a singular structure, capable of switching among the three impedance...
In this work, we present a radar countermeasure technique based on time-modulated metasurfaces for false target generation in radar systems that make use of symmetrical triangular linearly frequency modulated (ST-LFM) signals. The technique leverages on the dynamic change of the artificial Doppler frequency shift induced by the metasurface, enablin...
In this work, we present an anti-interference direction of arrival (DoA) estimation system based on a space–time-modulated metasurface (STM-MTS). The proposed system, composed by a 1-bit STM-MTS and a single receiving antenna, can accurately estimate DoA of a linearly frequency modulated (LFM) plane wave in the presence of several other LFM interfe...
In this letter, we propose a novel micro-motion false target generation method based on the scattering center model using time-modulated metasurface. First, the scattering center model is constructed to analyze the micro-Doppler characteristics of the intended deceptive target, which extracts both the echo phase and micro-Doppler frequency of the s...
A forward parametric modeling method is proposed to establish three-dimensional (3-D) attributed scattering center (ASC) models for dynamic group targets. The main steps include computer-aided design (CAD) model component decomposition, occlusion analysis for group targets, selection of scattering sources, extracting scattering center parameters, a...
An electromagnetic (EM) metasurface is a passive device capable of manipulating the reflected signal of a radar in both spatial and frequency domains. This paper presents a novel analytical design of EM scattering center model guided passive synthetic aperture radar (SAR) deception based on diverse frequency time-modulation. The objective of this d...
This paper presents a fast solver for volume surface integral equations (VSIEs) of composite perfect electric conductor (PEC) and high contrast dielectric objects by a nested kernel-independent method. The kernel-dependent approximations are effective only when groups are far away from each other in terms of wavelength. However, this will restrict...
In this paper, a characteristic mode (CM)-based design methodology is developed for the reconfigurable microwave metasurface absorbers (MMA) with using commercially available substrates. Theoretical intrinsic connection between modal behaviors and absorption properties is first formulated for the design of the structures. As a proof of the method,...
p> In this paper, we propose a multifunctional space-time modulated metasurface (STM-MTS) able to perform simultaneously a direction of arrival (DoA) estimation and radar cross section (RCS) manipulation in a single system. The metasurface consists of an alignment of unit-cells, whose scattering response can be dynamically controlled to be transpar...
p>In this letter, we propose a nonlinear reflective metasurface-based frequency mixing system able to perform second-harmonic generation (SHG) and third-harmonic generation (THG). The metasurface consists of a planar bidimensional alignment of unit-cells, each of which encompasses a receiving element at fundamental frequency, and two transmitting e...
p> In this paper, we propose a multifunctional space-time modulated metasurface (STM-MTS) able to perform simultaneously a direction of arrival (DoA) estimation and radar cross section (RCS) manipulation in a single system. The metasurface consists of an alignment of unit-cells, whose scattering response can be dynamically controlled to be transpar...
p>In this letter, we propose a nonlinear reflective metasurface-based frequency mixing system able to perform second-harmonic generation (SHG) and third-harmonic generation (THG). The metasurface consists of a planar bidimensional alignment of unit-cells, each of which encompasses a receiving element at fundamental frequency, and two transmitting e...
In this letter, we propose a nonlinear reflective metasurface-based frequency mixing system able to perform second-harmonic generation (SHG) and third-harmonic generation (THG). The metasurface consists of a planar bidimensional alignment of unit-cells, each of which encompasses a receiving element at fundamental frequency, and two transmitting ele...
In this article, we propose a multifunctional space–time-modulated metasurface (STM-MTS) able to perform simultaneously a direction of arrival (DoA) estimation and radar cross section (RCS) manipulation in a single system. The metasurface consists of an alignment of unit cells, whose scattering response can be dynamically controlled to be transpare...
p>This paper presents a new design of diverse frequency time-modulation for linear frequency modulated (LFM) radar passive false target spoofing. To realize the passive diverse frequency time-modulation, the modulated metasurface is designed accordingly, which is composed by a set of elements, each of which is independently time-modulated to realiz...
This paper presents a new design of diverse frequency time-modulation for linear frequency modulated (LFM) radar passive false target spoofing. To realize the passive diverse frequency time-modulation, the modulated metasurface is designed accordingly, which is composed by a set of elements, each of which is independently time-modulated to realize...
Three different deep learning models were designed in this paper, to predict the electric fields of single nanoparticles, dimers, and nanoparticle arrays. For single nanoparticles, the prediction error was 4.4%. For dimers with strong couplings, a sample self-normalization method was proposed, and the error was reduced by an order of magnitude comp...
Planar metasurfaces have been applied in several fields. Near-field coupling is typically neglected in traditional metasurface designs. A numerical modeling method for macrocells that considers near-field couplings between meta-atoms is proposed. A deep neural network (DNN) is constructed to accurately predict the electromagnetic response from diff...
Doppler cloaks are engineered electromagnetic covers, based on (space-)time modulated metamaterials and metasurfaces, able to compensate the Doppler effect induced by the motion of a scattered, making it appears as if it were at rest to a detecting radar system. Perfect Doppler compensation can be theoretically always achieved for any relative velo...
—This paper presents a false target jamming method
for linear frequency modulated (LFM) radar based on diverse
frequency time-modulated metasurface (DF-MTS). The DF-MTS
is composed by a set of elements, each of which is independently
time-modulated to realize specific false targets in the
high-resolution range profile (HRRP) of the radar syste...
Three different deep learning models were designed in this paper, to predict the electric fields of single nanoparticles, dimers, and nanoparticle arrays. For single nanoparticles, the prediction error was 4.4%, respectively. For dimers with strong couplings, a sample self-normalization method was proposed, and the error was reduced by an order of...
p> Planar metasurfaces have been applied in several fields. Near-field coupling is typically neglected in traditional metasurface designs. A numerical modeling method for macrocells that considers near-field couplings between meta-atoms is proposed. A deep neural network (DNN) is constructed to accurately predict the electromagnetic response from d...
p> Planar metasurfaces have been applied in several fields. Near-field coupling is typically neglected in traditional metasurface designs. A numerical modeling method for macrocells that considers near-field couplings between meta-atoms is proposed. A deep neural network (DNN) is constructed to accurately predict the electromagnetic response from d...
A metasurface-based Direction of Arrival (DoA) estimation method is presented. The method exploits the properties of space-time modulated reflective metasurfaces to estimate in real-time the impinging angle of an illuminating monochromatic plane wave. The approach makes use of the amplitude unbalance of the received fields at broadside at the frequ...
An effective method for identifying inertia characteristics of cone-shaped space target based on deep learning is proposed. The inertia ratio is determined by the time-varying scattering fields from the cone-shaped targets. The multistatic method is introduced to reduce the evaluation time of time-varying scattering fields. The micro-Doppler spectr...
Theory of characteristic modes (TCM) is applied to the design of a programmable flexible metasurface (PFMS) to achieve its multistate tunable microwave absorption. The designed metasurface consists of two layers. The first layer is a very thin polyimide (PI), on which unit cells consisting of two trapezoidal patches symmetrical along the central bi...
An effective method for identifying inertia characteristics of cone-shaped space target based on deep learning is proposed. The inertia ratio is determined by the time-varying scattering fields from the cone-shaped targets. The multistatic method is introduced to reduce the evaluation time of time-varying scattering fields. The micro-Doppler spectr...
We demonstrate a high-efficiency on-chip one-dimensional metalens for three-dimensional (3D) light focusing. The metalens consists of a one-dimensional dielectric nano-antenna array, which scatters the evanescent wave of a nano-waveguide into free space and focuses this scattered light into a 3D ring. The corresponding phase profile of the metalens...
Surface Enhanced Raman Scattering (SERS) has been widely used in the fields of surface science, spectral analysis, biosensors, and biomedical detection. A wideband nested equivalent source approximation (WNESA) accelerated method of moments (MoM) of multiple material regions is proposed, for the analysis of SERS by nanostructure. The SERS affected...
In this paper, we propose a reduced-complexity finite difference time domain (FDTD) simulations of modulated metasurfaces with arbitrary unit cells. The three dimensional (3D) physical structure of the metasurface is substituted by a spatially-varying surface impedance boundary condition (IBC) in the simulation; as the mesh size is not dictated by...
Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domain simultaneously. In this paper, an analytical design of space-time-modulated metasurfaces with modulation elements composed of two paths, In-phase (I) and Quadrature (Q), is proposed. The model is derived analytically, the space/frequency domain mani...
p>Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domain simultaneously. In this paper, an analytical design of space-time- modulated metasurfaces with modulation elements composed of two paths, In-phase (I) and Quadrature (Q), is proposed. The model is derived analytically, the space/frequency domain m...
In this paper, we present a metasurface-based Direction of Arrival (DoA) estimation method that exploits the properties of space-time modulated reflecting metasurfaces to estimate in real-time the impinging angle of an illuminating monochromatic plane wave. The approach makes use of the amplitude unbalance of the received fields at broadside at the...
In this paper, we present a metasurface-based Direction of Arrival (DoA) estimation method that exploits the properties of space-time modulated reflecting metasurfaces to estimate in real-time the impinging angle of an illuminating monochromatic plane wave. The approach makes use of the amplitude unbalance of the received fields at broadside at the...
A fast and accurate numerical method based on the theory of characteristic mode (TCM) is proposed for analyzing electromagnetic scattering from repetitive multiscale array structures. In order to overcome the low frequency breakdown problem when interacting at short distances between observation and source basis functions, the CMs are extracted fro...
p>Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domain simultaneously. In this paper, an analytical design of space-time- modulated metasurfaces with modulation elements composed of two paths, In-phase (I) and Quadrature (Q), is proposed. The model is derived analytically, the space/frequency domain m...
p>Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domain simultaneously. In this paper, an analytical design of space-time- modulated metasurfaces with modulation elements composed of two paths, In-phase (I) and Quadrature (Q), is proposed. The model is derived analytically, the space/frequency domain m...
In this paper, a review of the low-rank factorization method is presented, with emphasis on their application to multiscale problems. Low-rank matrix factorization methods exploit the rank-deficient nature of coupling impedance matrix blocks between two separated groups. They are widely used, because they are purely algebraic and kernel free. To im...
Planar achromatic metalenses with a thickness of the order of wavelength have attracted much attention for their potential applications in ultra-compact optical devices. However, realizing single-layer achromatic metalenses across a wide bandwidth requires that the corresponding meta-atoms have complex cross-sections for correct phase profile and d...
Frequency selective surface (FSS) is of great research interest for its wide applications in radome, absorber, electromagnetic filters, and artificial electromagnetic bandgap materials. In order to achieve a multifunctional FSS with real-time manipulated RCS, there are mainly three ways, i.e. to design reconfigurable FSS unit cell, reconfigurable s...
We propose an effective domain decomposition method with spherical equivalence surface for the electromagnetic modeling and imaging of moving bodies of revolution (BoRs) from near coupling to far coupling region. The moving BoRs are modeled with a series of stationary moments with respect to the time, each object is enclosed by a spherical equivale...
Frequency selective surface (FSS) is of great research interest for its wide applications in radome, absorber, electromagnetic filters, and artificial electromagnetic bandgap materials. In order to achieve a multifunctional FSS with real-time manipulated radar cross-section (RCS), there are mainly three ways, i.e. to design reconfigurable FSS unit...
