A5102828626- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Superconducting and THz Device Technology
- Terahertz technology and applications
- Gyrotron and Vacuum Electronics Research
- Geophysical Methods and Applications
- Antenna Design and Analysis
- GaN-based semiconductor devices and materials
- Infrastructure Maintenance and Monitoring
- Photonic and Optical Devices
- Geotechnical Engineering and Underground Structures
- Advanced MIMO Systems Optimization
- Antenna Design and Optimization
- Photonic Crystals and Applications
- Millimeter-Wave Propagation and Modeling
National Space Science Center
2023-2025
Chinese Academy of Sciences
2023-2025
University of Chinese Academy of Sciences
2023-2024
In this article, a novel waveguide reconfigurable Schottky diode-based frequency doubler with tunable multiband high efficiency output is proposed and demonstrated. The achieved by input matching cross-band circuits matching. the doubler, whole cavity composed of two parts: cavities coused main circuit associated cavity. These are designed to match impedance for corresponding band. adopted weight optimization fulfill multiband. Then, assembled into through reduced-height choke flange, which...
In this paper, a high efficiency and power 165–180 GHz balanced doubler based on the planar Schottky diode is presented. To maximize of in target frequency band, an in-band embedded impedance optimization method (IEIOM) adopted. The aims to extract conjugate value impedances three-dimensional electromagnetic (3D-EM) model diode. Compared at single point using Load-Pull, proposed not only takes account for both conversion bandwidth but also simplifies operation process. verify concept, was...
Summary This paper proposes a high‐power solid‐state power combining frequency multiplier source based on waveguide magic‐T divider. The has the merits of high isolation and reliability compared to conventional Y/T junction dividers wider bandwidth 3 dB couplers. In magic‐T, two‐stage cuboid ridge is employed reduce difference‐port reflection act as matching element for improved port. Furthermore, two bent waveguides are connected with output port which can achieve phase congruence. be...
Terahertz scattering-type scanning near-field optical microscopy (THz-s-SNOM), known for its high resolution, is widely used across fields. However, application to sample shapes underexplored. This study simulates rough surfaces, revealing the impact of surface roughness on scattered signals. Using a self-built THz-s-SNOM system, it images contaminated samples, aiding in determining contaminant nature. These findings enhance our understanding morphology effects signals, showcasing diverse...
To address the requirement of functioning as a transmit/receive isolation device in terahertz transceiver systems, this paper, we present two high−isolation multi−branch waveguide directional couplers operating at center frequency 510 GHz. One is high−performance five−branch coupler, and other new type three−branch coupler with lower processing difficulty. Both were fabricated using low−cost CNC milling technologies. The performance these was verified through measurement results,...
The detachment of railway tunnel lining constitutes a grave danger to train operation safety and drastically curtails the tunnel’s service life. This study endeavors efficiently detect void defects in by creating finite element model structures. Utilizing this model, simulates nonlinear acoustic wave propagation cloud maps for three representative structures: void-free, air void, water void. facilitates thorough examination signal characteristics wavefield, time domain, frequency domain. To...
In this paper, a high-power 170 GHz frequency doubler based on Schottky diode is proposed using an in-phase power-combining structure. Unlike conventional doubler, the utilizes combination of T-junction power divider and two bend waveguides to eliminate phase difference between output ports divider, so as achieve combining with concise The was fabricated 50 μm thick AlN high-thermal-conductivity substrate reduce impact thermal effect performance. measured results show that exhibits...
In this paper, A 170GHz frequency doubler based on thermal optimization with high output power is proposed. The gap between different rows of anodes optimized by simulation, while the effect phase difference caused also considered. influence coupling and performance compromised to achieve best performance. With input 29dBm diode bias voltage -11V, simulated above 100 mW for band 165-175GHz.The maximum 107 at 172GHz. Compared without optimization, efficiency increased 3.1%, handling capacity...
In this paper, a monolithically integrated 170 GHz doubler based on GaN Schottky barrier diode (SBD) is proposed. Unlike the traditional hybrid frequency multiplier technology, monolithic technology has been used in design and fabrication of SBD-based doubler. The ones can achieve low conversion loss by reducing mounting error. circuit designed 75um thick sapphire substrate. Measured results show that peak output power 12.7mW under continuous wave (CW) input 404mW at 166GHz, efficiency 3.1%.