Lin Meng
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View article: High-Density Neuromorphic Inference Platform (HDNIP) with 10 Million Neurons
High-Density Neuromorphic Inference Platform (HDNIP) with 10 Million Neurons Open
Modern neuromorphic processors exhibit neuron densities that are orders of magnitude lower than those of the biological cortex, hindering the deployment of large-scale spiking neural networks (SNNs) on single chips. To bridge this gap, we …
View article: A 0.96pJ/SOP, 30.23K-neuron/mm^2 Heterogeneous Neuromorphic Chip With Fullerene-like Interconnection Topology for Edge-AI Computing
A 0.96pJ/SOP, 30.23K-neuron/mm^2 Heterogeneous Neuromorphic Chip With Fullerene-like Interconnection Topology for Edge-AI Computing Open
Edge-AI computing requires high energy efficiency, low power consumption, and relatively high flexibility and compact area, challenging the AI-chip design. This work presents a 0.96 pJ/SOP heterogeneous neuromorphic system-on-chip (SoC) wi…
View article: Switchable and high-efficiency phase-locking of S-band magnetrons with coaxial line
Switchable and high-efficiency phase-locking of S-band magnetrons with coaxial line Open
We propose a coaxial line structure for phase-locking between magnetrons in the S-band for the first time. In this structure, two magnetrons operating in the π-mode are tightly coupled by the coaxial line. The design of a coaxial line stru…
View article: Study of an overmoded structure for megawatt <i>Ka</i>-band extended interaction klystron
Study of an overmoded structure for megawatt <i>Ka</i>-band extended interaction klystron Open
For most applications in the millimeter wave band, corresponding to Ka and higher-frequency bands, relatively high atmospheric absorption necessitates the use of high-power sources. Here, a new approach for projecting an oversized beam tun…
View article: High-efficiency phase-locking experiment of modular Ka-band coaxial magnetrons
High-efficiency phase-locking experiment of modular Ka-band coaxial magnetrons Open
The first full demonstration of a high-efficiency phase-locking mechanism was accomplished in the millimeter-wave (mm wave) bands. Two modular Ka-band coaxial magnetrons were fabricated and phase-locked. The coaxial magnetron consisted of …
View article: Particle-in-Cell Simulations on High-Efficiency Phase-Locking Millimeter-Wave Magnetrons with Unsynchronized High-Voltage Pulses
Particle-in-Cell Simulations on High-Efficiency Phase-Locking Millimeter-Wave Magnetrons with Unsynchronized High-Voltage Pulses Open
Phase locking is an essential choice for building a coherent array, and a system of phase-locked magnetrons is relatively compact and cheaper than other microwave sources. Previous theoretical and experimental studies on phase locking are …
View article: Design and Non-Uniform Current Analysis of a 0.35-THz Extended Interaction Oscillator Based on Pseudospark-Sourced Multiple Sheet Electron Beams
Design and Non-Uniform Current Analysis of a 0.35-THz Extended Interaction Oscillator Based on Pseudospark-Sourced Multiple Sheet Electron Beams Open
A novel method, which combines a multiple-beam extended interaction oscillator (EIO) with pseudospark-sourced (PS) sheet electron beams, is applied to generate high-power terahertz sources. For a multiple-beam EIO, the beam cross-section i…
View article: Particle-In-Cell Simulations of High Efficiency 12-Vanes 2.45 GHz Continuous Wave Magnetron
Particle-In-Cell Simulations of High Efficiency 12-Vanes 2.45 GHz Continuous Wave Magnetron Open
As an essential vacuum electronic device for producing the microwave, the magnetron has various applications. This study developed a novel high-efficiency 12-vanes CW magnetron and anode resonance system that improved mode separation, expa…
View article: Characteristics of Ionospheric Scintillations in Chengdu, China
Characteristics of Ionospheric Scintillations in Chengdu, China Open
The atmosphere was affected by ionospheric irregularity when wireless electromagnetic waves pass through the region.And the amplitude and phase fluctuate rapidly in a short period, which is called ionospheric scintillation.To better invest…
View article: Preliminary Study of a G-Band Extended Interaction Oscillator Operating in the TM31-3π Mode Driven by Pseudospark-Sourced Multiple Electron Beams
Preliminary Study of a G-Band Extended Interaction Oscillator Operating in the TM31-3π Mode Driven by Pseudospark-Sourced Multiple Electron Beams Open
This paper presents the first design that combines pseudospark-sourced (PS) electron beams with a multiple-beam extended interaction oscillator (EIO). The PS electron beam is an excellent choice for driving EIOs because it has high current…
View article: The Transformation from Surface Wave into Radiation Wave Using Composite Subwavelength Holes Array
The Transformation from Surface Wave into Radiation Wave Using Composite Subwavelength Holes Array Open
Smith–Purcell radiation (SPR) is a phenomenon in that free electrons moving above a periodic structure deliver a part of their kinetic energies to electromagnetic waves. It plays an important role in the development of radiation sources an…
View article: Design of high-power arbitrary multi-way radial power dividers using periodic matching structure
Design of high-power arbitrary multi-way radial power dividers using periodic matching structure Open
An arbitrary multi-way radial power divider/combiner with high-power capacity based on the coaxial waveguide TE01-mode is presented in this paper. The study of the TE01-mode in the coaxial waveguide shows the radial power divider can opera…
View article: Research of the Oscillation Start-Up Time in an Extended Interaction Oscillator Driven by a Pseudospark-Sourced Sheet Electron Beam
Research of the Oscillation Start-Up Time in an Extended Interaction Oscillator Driven by a Pseudospark-Sourced Sheet Electron Beam Open
High current density and high brightness are critical factors for high-power and compact extended interaction oscillators (EIOs) which are operated in the terahertz (THz) waveband. The pseudospark-sourced (PS) sheet electron beam, which co…
View article: Simplistic, Efficient, and Low-Cost Crack Detection of Dielectric Materials Based on Millimeter-Wave Interference
Simplistic, Efficient, and Low-Cost Crack Detection of Dielectric Materials Based on Millimeter-Wave Interference Open
This paper proposes a simplistic, efficient, and low-cost method of millimeter-wave nondestructive testing (NDT) of dielectric material cracks based on millimeter-wave interference. A relationship between combining efficiency, phase differ…
View article: Clarifying duplicated electromagnetic characteristics for 220-GHz two-beam extended interaction oscillator
Clarifying duplicated electromagnetic characteristics for 220-GHz two-beam extended interaction oscillator Open
In this paper, we clarify the duplicated electromagnetic characteristics between the proposed two-beam overmoded multi-gap structure published in the paper titled “Tractable resonant structure with two nonuniform beams for a high-power 0.2…
View article: Transient Response of Twisted Wire Pairs Illuminated by HEMP
Transient Response of Twisted Wire Pairs Illuminated by HEMP Open
In this paper, the time domain characters of the response of twisted wire pairs (TWPs) excited by the high-altitude electromagnetic pulse (HEMP) have been proposed. The finite different time domain transmission line model (FDTD-TLM) method…
View article: Dual-mode terahertz extended interaction oscillator driven by a pseudospark-sourced sheet electron beam
Dual-mode terahertz extended interaction oscillator driven by a pseudospark-sourced sheet electron beam Open
A terahertz dual-mode extended interaction oscillator (EIO) driven by a pseudospark-sourced sheet electron beam (SEB) was presented. The major advantages of the newly developed circuit include 1) high-density SEB interacting with the TM11 …
View article: Design and analysis of a quasi-TM03 mode <i>G</i>-band extended interaction radiation source
Design and analysis of a quasi-TM03 mode <i>G</i>-band extended interaction radiation source Open
A disk-loaded coupled cavity structure operating in the quasi-TM03 mode has been used here to develop a high electron efficiency, high output power terahertz radiation source, demonstrating that it is possible to concentrate the axial fiel…
View article: Smith-Purcell radiation based on the transmission enhancement of a subwavelength hole array with inner tunnels
Smith-Purcell radiation based on the transmission enhancement of a subwavelength hole array with inner tunnels Open
The use and control of the extraordinary optical transmission through subwavelength hole arrays has enormous application potential in photonic devices. In this paper, we propose a subwavelength hole array with inner tunnels, for which the …
View article: Characteristics of Ionospheric Scintillation in Chengdu, China
Characteristics of Ionospheric Scintillation in Chengdu, China Open
When wireless electromagnetic waves pass through the earth's atmosphere, they are affected by ionospheric irregularities, and their amplitude and phase will jitter rapidly in a short period of time, which is called ionospheric scintillatio…
View article: Analysis of the Resonator Part of a Ka-Band Multiple-Beam Extended-Interaction Oscillator through Electric Field Uniformity
Analysis of the Resonator Part of a Ka-Band Multiple-Beam Extended-Interaction Oscillator through Electric Field Uniformity Open
The development of multiple-beam devices is required due to the increasing demand of compact, high-frequency, and high-power vacuum devices. A Ka-band multiple-beam extended-interaction oscillator which operates in TM01 mode with a large d…
View article: Effect of ions on conductivity and permittivity in the Polar Mesosphere Summer Echoes region
Effect of ions on conductivity and permittivity in the Polar Mesosphere Summer Echoes region Open
For the first time, the effect of ions on complex conductivity and permittivity of dusty plasma at Polar Mesosphere Summer Echoes (PMSE) altitude is analyzed. Because of ions higher mass and smaller thermal velocity, generally, their effec…
View article: Exploring the occurrence rate of PMSE-Es by Digisonde at Tromsø
Exploring the occurrence rate of PMSE-Es by Digisonde at Tromsø Open
Polar mesosphere summer echoes (PMSE) are observed simultaneously with Digisonde and EISCAT VHF radar. The phenomenon of irregular Es layers is called PMSE-like or PMSE-Es (Polar Mesosphere Summer Echoes-Es) and has some relationship with …
View article: Characteristic analysis of layered PMSEs measured with different elevation angles at VHF based on an experimental case
Characteristic analysis of layered PMSEs measured with different elevation angles at VHF based on an experimental case Open
Polar Mesosphere Summer Echoes (PMSEs) are very strong radar echoes observed at altitudes near the polar summer mesopause. One of the essential properties of these radar echoes is that they can give useful diagnostic information about the …
View article: Measurement of axial field distribution in a W-band extended interaction resonant cavity based on perturbation technique
Measurement of axial field distribution in a W-band extended interaction resonant cavity based on perturbation technique Open
The theoretical analysis and the experiment of perturbation techniques to the quantitative measurement of electric field characteristics in a 94 GHz extended interaction resonant cavity (EIRC) are described. Parameters such as the observed…
View article: Third harmonic working based on the Smith–Purcell radiation in a closed structure
Third harmonic working based on the Smith–Purcell radiation in a closed structure Open
Smith–Purcell radiation is well analyzed in an open structure; however, it is seldom studied in a closed structure. In a high order mode resonant system, the harmonics of the spoof surface plasmon in the subwavelength hole array will be tr…
View article: A fractional phase-coding strategy for terahertz beam patterning on digital metasurfaces
A fractional phase-coding strategy for terahertz beam patterning on digital metasurfaces Open
Coding metasurfaces have drawn great attention for its digital wave manipulation in deep subwavelength-scale in the last decade, more sophisticated and flexible coding strategies suitable for terahertz wavefront manipulations are becoming …
View article: Experimental Research of X-Band Dual-Frequency Coaxial Relativistic Backward Wave Oscillator
Experimental Research of X-Band Dual-Frequency Coaxial Relativistic Backward Wave Oscillator Open
The design and experimental demonstration of an X-band coaxial dual-frequency relativistic backward wave oscillator (CRBWO) with sectioned slow wave structures (SWSs) is presented. In this paper, we describe the experimental measurement me…
View article: On the radar frequency dependence of polar mesosphere summer echoes
On the radar frequency dependence of polar mesosphere summer echoes Open
Polar mesosphere summer echoes (PMSEs) are very strong radar echoes in the polar mesopause in local summer. Here we present the frequency dependence of the volume reflectivity and the effect of energetic particle precipitation on modulated…