Prof. Anxue Zhang

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Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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20 May 2021 in Nature Communications

Journal Article

Phase-to-pattern inverse design paradigm for fast realization of functional metasurfaces via transfer learning

Tianshuo Qiu

Chenglong Hao

Metasurfaces have provided unprecedented freedom for manipulating electromagnetic waves. In metasurface design, massive meta-atoms have to be optimized to produce the desired phase profiles, which is time-consuming and sometimes prohibitive. In this paper, we propose a fast accurate inverse method of designing functional metasurfaces based on transfer learning, which can generate metasurface patterns monolithically from input phase profiles for specific functions. A transfer learning network based on GoogLeNet-Inception-V3 can predict the phases of 2^8×8 meta-atoms with an accuracy of around 90%. This method is validated via functional metasurface design using the trained network. Metasurface patterns are generated monolithically for achieving two typical functionals, 2D focusing and abnormal reflection. Both simulation and experiment verify the high design accuracy. This method provides an inverse design paradigm for fast functional metasurface design, and can be readily used to establish a meta-atom library with full phase span.

17 August 2022 in IEEE Transactions on Microwave Theory and Techniques

Journal Article

Millimeter-Wave E-Plane Waveguide Bandpass Filters Based on Spoof Surface Plasmon Polaritons

A class of millimeter-wave E-plane waveguide bandpass filters (BPFs) based on spoof surface plasmon polaritons (SSPPs) have been presented in this article. Three kinds of SSPPs, with different patterns coated on the dielectric substrate, are inserted into the E-plane of WR-10 standard rectangular waveguide for the design of BPFs. To clarify the filtering characteristics of the proposed BPFs, the dispersive properties of different SSPP unit cells are investigated and discussed. The electromagnetic simulation results demonstrate that the bandwidths and center frequencies of the proposed E-plane waveguide BPFs can be flexibly adjusted by controlling the asymptotic frequencies of SSPP unit cells. For verifying the design feasibility, these three E-plane waveguide BPFs are fabricated and measured. Good agreement between measurements and simulations indicates that the proposed idea will be a good candidate for the BPF design with low insertion loss and flexible adjustment of center frequency and bandwidth.

28 January 2023 in Nanomaterials

Journal Article

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Metasurfaces have shown their great capability to manipulate electromagnetic waves. As a new concept, reconfigurable metasurfaces attract researchers’ attention. There are many kinds of reconfigurable components, devices and materials that can be loaded on metasurfaces. When cooperating with reconfigurable structures, dynamic control of the responses of metasurfaces are realized under external excitations, offering new opportunities to manipulate electromagnetic waves dynamically. This review introduces some common methods to design reconfigurable metasurfaces classified by the techniques they use, such as special materials, semiconductor components and mechanical devices. Specifically, this review provides a comparison among all the methods mentioned and discusses their pros and cons. Finally, based on the unsolved problems in the designs and applications, the challenges and possible developments in the future are discussed.

1 September 2016 in IEEE Transactions on Signal Processing

Journal Article

Robust Adaptive Beamforming Based on Conjugate Gradient Algorithms

Ming Zhang

Anxue Zhang

Qingqing Yang

The mismatches of signal and array geometry will seriously degrade the performance of adaptive beamformer. In this paper, we propose two methods for robust adaptive beamforming based on the conjugate gradient (CG) algorithm. The proposed beamformers offer a significant improvement in the computational complexity while providing the same performance of the best robust beamformers at present. The first method belongs to the diagonal loading technique. We derive a diagonal loading CGLS algorithm (CG applied to normal equations) and propose a simple method to choose the loading level based on a coarse estimation of the desired signal power. This parameter-free method can effectively reduce the signal self-cancellation at high signal-to-noise ratio. The second method belongs to the regularization technique. Since the CG algorithm has a regularizing effect with iteration number being the regularization parameter, the stopping criterion plays an important role on the robustness. We develop three fast stopping criteria for CG iteration, which reduce the stopping complexity from O(N) or O(N ² ) to O(1). The former two are the fast versions of existing methods and the later one is new. Moreover, the new criterion based on fast Ritz value estimation has better performance than others.

1 September 2020 in IEEE Antennas and Wireless Propagation Letters

Journal Article

Split-Ring Resonator-Loaded Baffles for Decoupling of Dual-Polarized Base Station Array

Ahmed Abdelwahed Kishk

Baffles loaded by split-ring resonator (SRR) are proposed to reduce the mutual coupling for ± 45° dual-polarized multiple-input-multiple-output (MIMO) antenna. Each baffle consists of two rectangular SRR printed on one side of a 1-mm FR4 substrate. The final decoupling structure contains four baffles forming a barrier wall that reduces the coupling over the 5G band of 3.4-3.8 GHz. Dual-polarized cross-dipole array with SRR loading baffles is simulated and measured to demonstrate their effectiveness in the coupling reduction. The results show that the mutual coupling can be effectively reduced below -25 dB over the entire bandwidth while maintaining a compact array.

12 November 2018 in IEEE Antennas and Wireless Propagation Letters

Journal Article

Generation of Multiple Modes Microwave Vortex Beams Using Active Metasurface

In this letter, an active metasurface for vortex beam generation is proposed. This metasurface can transform the incident plane wave into beams carrying orbital angular momentum (OAM) of three different orders. This active metasurface is composed of an array of varactor diodes loaded unit cells. The transmission phase of each metasurface unit cell can be fully controlled by the capacitance of the varactor diodes. Different modes of vortex beams can be separately generated by simply changing the transmission phase distribution on the metasurface aperture. The properties of the proposed active metasurface are demonstrated by simulation and measurement results, which have a good agreement with each other.

About Me

Professor of Xi'an Jiaotong University, doctoral supervisor, deputy director of the Department of Information and Communication Engineering, director of the Institute of Microwave Engineering and Optical Communication, member of the Professional Committee of the Chinese Antenna Society, member of the Academic Committee of the Antenna Society of the Chinese Academy of Sciences ultra-high-speed circuit design and electromagnetic compatibility Ministry of Education main lab. Their research direction involves new antenna design and diversity technology, mobile communication microwave radio frequency technology, intelligent radar signal processing, multi-antenna system and array signal processing, and microwave test theory and system design, among others. Presided over more than 30 general assembly exploration projects, conference pre-research projects, National Natural Science Foundation of China, and 863 other scientific research projects and enterprise cooperation projects, with a total funding of nearly 20 million yuan; authorized 14 Chinese invention patents and 1 American invention patent and published more than 200 papers; won 1 second prize of provincial and ministerial scientific and technological progress; many research results have been applied in communication equipment and equipment.

Prof. Anxue Zhang

Prof. Anxue Zhang

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