Yejun He

• Ph.D.
• Professor (Full) at Shenzhen University

Unmanned aerial vehicles (UAVs) with communication and computing capabilities are essential for supporting mobile edge computing (MEC). They can be deployed flexibly to provide computing services for remote mountainous areas or disaster-stricken areas with damaged communication facilities, thereby enhancing communication quality and coverage area....

As the demand for global internet connectivity continues to grow, the satellite-terrestrial integrated networks (STINs) have become more and more crucial for expanding the service coverage and enhancing the network performance. However, the task offloading problem in STINs faces many significant challenges such as high processing latency and energy...

Given the swift advancement of the Internet of Things (IoT) and wireless power transfer (WPT), there is an increasing need for incorporating new functionalities like wireless communication, recognition, sensing, and localization into existing systems. In response to these evolving demands, a transformative rectenna-based unified platform has been d...

A phased array of triple-mode cavity antennas (TMCA) has been developed and designed for multiband millimeter-wave (mmWave) applications. It dynamically adjusts frequency to simultaneously change polarization and beam direction, while also adapting broadside and endfire directions. The unique design of the cavity mode results in small frequency rat...

A wideband integrated antenna is proposed with the realization of radiation and dual-polarized absorption in the same frequency band. The novelty of the proposed integrated structure lies in the share-aperture of the frequency-selective absorber and magnetoelectric dipole, which remain mutually independent and have orthogonal operating characterist...

A stable high gain cylindrical dielectric resonator antenna (CDRA) based on high-order mode HEM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11δ+2</sub> is proposed. This design simplifies the complexity of the structure, combined with wideband feeding method, and exhibits a significant high gain pe...

Satellite communication networks with the characteristics of wide coverage, high deployment flexibility, and seamless communication services can provide communication services to users who don’t communicate with ground networks but directly communicate with satellites. In response to the increasing demand for user services, this paper proposes a co...

A novel approach for generation of the multiple three‐directional and controllable beams from a cubical electromagnetic (EM) wave radiator is proposed in this paper. This cubical radiator is a multiple‐mode EM resonator, which is formed by a cubical metal cavity. Three resonant modes are excited in this cavity resonator by a feeding slot. Besides t...

This article introduces a millimeter-wave (mmw) communication system with concomitant multifold orthogonal beamforming (CMOB) antenna array to support vehicle to vehicle (V2V) and vehicle to infrastructure (V2I) communications. Through a single feed, the antenna triggers the TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http:/...

This article proposes a full-metal omnidirectional series-fed filtenna array. The antenna is primarily composed of an outer metal shell, a built-in metal post and three pairs of open circuit branches. To achieve horizontal omnidirectional radiation, a circular groove is dug on the outer metal shell. Additionally, the built-in metal post is connecte...

Haptic communications require ultra-high reliability to provide real-time interact among human beings and remote machines. 6G mobile networks (beyond 5G) are the most prominent candidates to support haptic communications. This article describes technologies in 6G mobile networks, and how these technologies can support haptic communications. Reliabi...

Traditional multi-layer frequency selective absorbers (FSAs) with antenna circuit suffer from inter-layer interference, which can adversely affect the in-band frequency bandwidth of wireless communication (fractional bandwidth FBW <20% in literature). In this paper, a circuit design of decoupling between FSA-layer and antenna layer is proposed to s...

Computing offloading optimization for energy saving is becoming increasingly important in low-Earth orbit (LEO) satellite-terrestrial integrated networks (STINs) since battery techniques has not kept up with the demand of ground terminal devices. In this paper, we design a delay-based deep reinforcement learning (DRL) framework specifically for com...

The resource-constrained edge devices are struggling with the rising computational demands of modern user applications with many dependent tasks. In this paper, we investigate the dependent task offloading strategy by constructing graph theory for the dependent tasks so that the explicit priority relations based on deep reinforcement learning (DRL)...

Federated learning (FL) is a distributed machine learning (ML). Distributed clients train locally and exclusively need to upload the model parameters to learn the global model collaboratively under the coordination of the aggregation server. Although the privacy of the clients is protected, which requires multiple rounds of data upload between the...

Traditional centralized machine learning uses a large amount of data for model training, which may face some privacy and security problems. On the other hand, federated learning (FL), which focuses on privacy protection, also faces challenges such as core network congestion and limited mobile device (MD) resources. The computation offloading techno...

A novel grid dielectric resonator antenna (DRA) planar arrays are proposed in this paper. In this design, the concept of traditional microstrip grid antenna array is applied to DRA for the first time, which greatly simplifies the complexity of the feeding network. It is noteworthy that the grid DRA array was constructed in a DR structure with a sim...

A modified Jerusalem-cross absorber (MJCA) based on resistors is presented to minimize mutual coupling at two independent bands of a very compact quad-port multiple-input-multiple-output (MIMO) antenna. The double E-shaped radiating element features sectoral slots, enabling the antenna to function at two distinct frequencies: a lower band of 6.5 GH...

This article introduces a compact and low phase noise (PN) 19-GHz quad-core class-F voltage-controlled oscillator (VCO) based on a square-geometry transformer tank using the inductor-sharing technique. The proposed square-geometry transformer tank is inherently more compact than the prevalent topologies such as star geometry, dual-row geometry, and...

In millimeter-wave (mmW) and terahertz (THz) applications, the transmission behavior along circuit structures and components, such as radiation and leakage losses, is critical for their overall performances. It is imperative to develop low-loss interconnect and transmission techniques that should be used for the construction of building circuit blo...

This paper provides a printed patch with the benefits of low size and easy geometrical arrangement for fifth-generation (5G) 28 GHz communication networks. The patch antenna's radiator is defective with a circular slit for improved performance. The antenna has a wide working bandwidth while maintaining a good gain. Later, A four-element multiple-in...

Unmanned aerial vehicles (UAVs) -assisted mobile edge computing (MEC) communication system has recently gained increasing attention. In this paper, we investigate a 3D multi-UAV trajectory optimization based on ground devices (GDs) selecting the target UAV for task computing. Specifically, we first design a 3D dynamic multi-UAV-assisted MEC system...

This communication proposes a wideband 3-D-printed transmit-reflect-array (TRA) antenna. The transmission and reflection functions of this TRA antenna are determined by the polarization of the incident electromagnetic wave. The proposed TRA element is composed of a dielectric post and three copper wires, which can be realized by the low-cost 3-D pr...

This paper proposed the design of bandpass filter (BPF) based on stepped window resonators (SWRs) which allows inline resonators to produce transmission zero (TZ). Compared with traditional cavity resonator using iris-coupled structure, the proposed SWR consists of two metal cavities, the larger cavity is regarded as a bandstop resonator to provide...

A novel low-cost, dual-polarized, two-dimensional (2-D) leaky-wave antenna (LWA) with four beams is proposed in this paper. The proposed 2-D LWA includes a 2-D leaky-wave radiation aperture and an orthogonal feeding network. The 2-D leaky-wave radiation aperture is evolved from two identical 1-D parallel-plate long-slot LWAs that are orthogonally p...

In this communication, a novel tightly coupled dual-polarized reflectarray antenna is presented. The antenna consists of a dual-polarized feed antenna and a wideband dual-polarized reflecting surface. The reflecting surface is composed of dual-polarized tightly coupled unit cells. Each unit cell contains two types of elements, of which the polariza...

A novel Filtenna-Filter-Filtenna (FA-F-FA)-based frequency selective surface (FSS) technique is proposed using multiple-mode resonators (MMRs). Based on this method, a bandpass FSS with simultaneous wide passband and wide out-of-band rejection is validated. The MMR unit cell consists of two back-to-back magneto-electric (ME-) dipole antennas and a...

In this paper, a new compact ultrawideband (UWB) circularly polarized (CP) antenna array for vehicular communications is proposed. The antenna array consists of a 2 × 2 sequentially rotated T-shaped cross dipole, four parasitic elements, and a feeding network. By loading the T-shaped cross dipoles with parasitic rectangular elements with cut corner...

Like free-space vortex beams, surface plasmon polaritons can carry orbital angular momentum to form plasmonic vortices (PVs). Recently, research interest in PV fundamentals and applications has increased. However, generating and manipulating the topological charges of PVs over wide ranges using on-chip devices remains challenging. Here, we propose...

This paper presents a novel and highly miniaturized single-layer frequency selective surface (FSS) for RF shielding. The FSS unit cell is comprised of a meandered crossed dipole structure designed over a low-profile laminate. The FSS achieves a shielding effectiveness of 43 dB at the 10 GHz frequency. Moreover, it provides a fractional bandwidth of...

This letter presents a low-profile, single-layer wide�band metamaterial-inspired circularly polarized (CP) multiple�input multiple-output (MIMO) antenna array. An 8×8 antenna array is manufactured on the Rogers RT/Duroid 5880 substrate with a partial ground plane. The dimensions of the proposed MIMO antenna array are 0.285λ × 0.11λ × 0.001λ at 28 G...

Reactive oxygen species (ROS)‐induced mitophagy is associated with a variety of diseases. Therefore, visualizing and modulating the process of ROS‐induced mitophagy is essential for understanding the role of mitophagy in cellular homeostasis, physiological processes, and pathogenesis. Herein, using fluorescence lifetime imaging microscopy (FLIM), f...

In the era of Internet of Things (IoT), mobile edge computing (MEC) and wireless power transfer (WPT) provide a prominent solution for computation-intensive applications to enhance computation capability and achieve sustainable energy supply. A wireless-powered mobile edge computing (WPMEC) system consisting of a hybrid access point (HAP) combined...

The integrated backscatter communication (BackCom) and active communication (AC) scheme can improve wireless powered mobile edge computing (WPMEC) system performance in general single-user and multi-user scenarios. However, there is little research in the cooperation-assisted WPMEC scenario. In this paper, we consider a cooperation-assisted WPMEC s...

A Ka-band 4TX/4RX dual-stream joint radar-communication phased-array transceiver is presented for the emerging radar-communication integrated wireless system. Different from the existing joint radar-communication transceiver with separated downconversion path and analog baseband, the proposed joint radar-communication transceiver features completel...

In order to design the wideband patch antenna, a hybrid method based on the artificial neural network (ANN) and the simulated annealing (SA) algorithm is proposed in this communication. The ANN is employed to describe the nonlinear relationship between the geometric parameters and the $S$ -parameters of the antenna. The ANN is trained by the data...

Dielectric resonator antennas (DRAs) under high-order multiple-modes resonator (MMR) for stable high gain are proposed in this communication. The approach is to implement slot cuts on the surface of DR for reconstructing the electric field distribution of high-order resonance modes. In this way, the sidelobes are reduced and two high-order modes ar...

Reconfigurable and Intelligent Metasurfaces In article number 2203747 the recent progress of intelligent metasurfaces, focusing on tuning mechanisms, hardware designs, and applications, is presented. Yejun He and co‐workers discuss the reconfigurable and programmable metasurfaces, classified as space‐gradient, time‐modulated, and space‐time modulat...

A circularly polarised (CP) antenna with highly symmetrical radiation patterns and wide operating bandwidth is presented for millimetre‐wave (mm‐wave) applications. By loading four parasitic inverted‐F components around a SIW‐fed S‐dipole antenna, better axial ratio (AR) performance and higher gain performance are realised. Furthermore, the propose...

This article presents two types of dual-narrowband/ wideband filters using modified coaxial cavities with large frequency ratios. The dual-narrowband/ wideband filters mean two dual-band bandpass filters, one of which is a dual-band wideband filter, and the other is a dual-band narrowband filter. The proposed coaxial resonator in the dual-narrowban...

Intelligent metasurfaces have gained significant importance in recent years due to their ability to dynamically manipulate electromagnetic (EM) waves. Their multifunctional characteristics, realized by incorporating active elements into the metasurface designs, have huge potential in numerous novel devices and exciting applications. In this article...