A5087906386- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- Advanced Power Amplifier Design
- Advancements in PLL and VCO Technologies
- Photonic and Optical Devices
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Electromagnetic Compatibility and Noise Suppression
- Energy Harvesting in Wireless Networks
- Advancements in Semiconductor Devices and Circuit Design
- Terahertz technology and applications
- Analog and Mixed-Signal Circuit Design
- Microwave and Dielectric Measurement Techniques
- Full-Duplex Wireless Communications
- Semiconductor Quantum Structures and Devices
- Silicon Carbide Semiconductor Technologies
- Superconducting and THz Device Technology
- Antenna Design and Optimization
- Copper Interconnects and Reliability
- Electrostatic Discharge in Electronics
- Gyrotron and Vacuum Electronics Research
- GNSS positioning and interference
- Machine Fault Diagnosis Techniques
Tianjin University
2016-2025
Tianjin University of Technology
2019-2023
Jet Propulsion Laboratory
2020
Space Information Laboratories (United States)
2020
North Carolina State University
2020
Aalto University
2020
The University of Western Australia
2020
UCLA Health
2020
The University of Adelaide
2020
Ocean University of China
2018
A low-profile microstrip antenna with stable radiation pattern in a relatively wide band is presented for 5G operation. Four resonant modes different frequencies are integrated single structure to enhance the bandwidth gain, and well matched by introducing folded walls. An impedance of 58.3% has been achieved from 2.84 5.17 GHz compact 0.84λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.68λ 0.06λ , where λ free-space wavelength at...
<?Pub Dtl=""?> To provide wide frequency tuning range (FTR) with compact implementation area, a new inductive method is introduced in this paper for CMOS 60 GHz voltage controlled oscillator (VCO). The based on switching inductor-loaded transformer by configuring different current return-paths the secondary coil of transformer. Different from previous methods, proposed VCO topology can achieve FTR multiple sub-bands at within area only one Two VCOs are demonstrated 65 nm design targets...
A 239–281 GHz sub-THz imager with circular- polarize d substrate-integrated-waveguide (SIW) antenna is demonstrated in CMOS 65 nm process high spectrum resolution and sensitivity for spectroscopy imaging system consideration of depolarization effects. The a receiver that consists circular polarized substrate integrated waveguide antenna, down-conversion mixer power gain amplifier (PGA). proposed measured <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Chalkiness in rice is adversely affected by high temperatures during the flowering and grain-filling stages. Potassium (K) essential for improving grain quality heat resilience. The effects of split application K fertilizer on chalkiness under stages were investigated this study. Four treatments, including ambient with basal (AT-K1), (HT-K1), 70% pre-transplanting 30% at heading stage (HT-K2), (HT-K3), conducted. results revealed that chalky rate degree reduced 9.2–13.72% 12.16–19.91%,...
Abstract The paper presents the design of a tetrode radio frequency (RF) amplifier system for high-current proton cyclotron accelerators used in production medical isotopes, targeting cyclotrons different energy levels. is based on variable with tuning mechanism, making it adaptable to devices operating at various levels and frequencies. wideband covers typical range 30–90 MHz, power output from 50 kW 150 kW. Based this design, performance testing was conducted, RF successfully tuned...
This brief presents the analysis and design of a two-stage stacked power amplifier (PA) with very broadband gain frequency response performance in small chip size. The load impedance match is realized using modified field-effect transistors (FETs) resistive feedback by analyzing matching condition source input FET. In order to further improve response, effectiveness expansion from driver demonstrated compensate compression last-stage amplifier. To verify concept, three-stacked PA has been...
The design strategies and the implementation of a two-stage concurrent dual-band (DB) microwave harmonic-tuned power amplifier (PA) are presented in this paper. stage driver circuit designed to operate under DB class-F conditions inverse conditions, respectively. proposed harmonic control network is implemented by combining composite right/left-handed transmission line biasing with tuning. A novel interstage matching developed transfer optimum fundamental output impedances input stage, as...
A dual-band multimode high-gain stacked-patch antenna based on substrate integrated suspended line (SISL) is proposed for 5G applications. The comprises five low-cost FR4 dielectric layers and ten metal with embedded air cavities. driven patch generates TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sub> mode xmlns:xlink="http://www.w3.org/1999/xlink">02</sub> mode, the other two modes are generated by etching U-slot horizontal slot to...
This article presents a 2.4–4-GHz wideband 7-bit switch-type phase shifter (STPS) with switch driver. Three shifting topologies are employed for the design of (PS), including switched <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$L/C$ </tex-math></inline-formula> structure, T-type and high-/low-pass network. For minimizing amplitude deviations, an improved structure filter has been proposed to boost...
A low-profile and wideband patch antenna is proposed for base station applications. In order to realize a wide band, two types of slots are adopted three resonant modes constructed within band interest. The mode analysis conducted clarify the performance. designed has an impedance bandwidth 52.7% (from 1.62 2.78 GHz) with structure 0.7λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.47λ 0.084λ , where λ free-space wavelength at...
A transparent reflectarray antenna integrated with solar cells is presented for satellite communications in the paper. The electromagnetic characteristics of at Ka-band are investigated, and a sub-wavelength X-shaped dipole element designed to augment reflectarray's performance. prototype an aperture 160 × 150 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> then analyzed, fabricated, tested validate proposed design. simulation...
The design and implementation of a GaN stacked distributed 2-19GHz monolithic microwave integrated circuit (MMIC) power amplifier (PA) is presented in this paper. PA architecture uses six cells, each containing stack three transistors. A method that employs capacitance compensation applied to 5-10-W for the 2-19-GHz range 100-nm on Si technology. resulting measured performance at 28-V supply shows gain flatness 20.5 ± 1.5 dB, with an output 37.4-40.9 dBm corresponding power-added efficiency...
In this article, a novel design method of dual-band and dual-state (DBDS) Doherty power amplifier (DPA) is proposed. Considering the actual parasitic parameters, DPA can be designed by using impedance transformation saturation back-off points at dual frequency bands DBDS as well second harmonic matching. The for (DB) 5G application, i.e., 3.4 4.9 GHz band are implemented, first time, metal-integrated substrate-integrated suspended line (MI-SISL) technology, which has advantages high...
A 2.1-GHz dividerless PLL with low power, reference spur and in-band phase noise is introduced in this paper. new detection mechanism using aperture-phase detector (APD) phase-to-analog converter (PAC) generates an analog voltage proportion to the error between VCO, then controls current amplitude of following charge pump (CP). The charging discharging currents proposed CP have equal pulse width small locked state, which reduces power consumption effectively. Moreover, compared conventional...
A reconfigurable injection-locked local oscillator (RE-ILO) generator that leverages a multitanks wideband-harmonic-shaping Class-F23 voltage-controlled (VCO), RE frequency multiplier (RE-ILFM), and power-efficient amplifier (ILFA) for multiple fifth-generation (5G) millimeter-wave (mm-wave) bands is hereby presented. For the VCO, an inductive inside positive feedback loop boosts drain-to-gate voltage gain (Av). Besides, source-inductive loaded on output buffer, coupled with separated...
Abstract The highly nonlinear variation of the ionospheric F 2 layer critical frequency ( f o ) greatly limits efficiency communications, radar, and navigation systems that employ high‐frequency radio waves. This paper proposes an effective method to predict using extreme learning machine (ELM). Compared with previous neural network model based on feedforward algorithm, ELM offers advantages faster training speed less manual intervention. is trained daily hourly values at Darwin (12.4°S,...
This brief presents a passive hybrid phase shifter consisted of 5-bit switch-type (STPS) and 4-bit high resolution reflection-type (RTPS). The STPS as the main body circuit utilizes bridged T-type high-pass/low-pass shifting cells. A novel high-resolution RTPS is proposed supplement to improve minimize error. In RTPS, reflective load, which contains transformer digital-controlled switched capacitor array, adopted. in can weaken variation reflection coefficient resulted by large-capacitance...
A reconfigurable injection-locked frequency multiplier (RE-ILFM) with both <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times 2$ </tex-math></inline-formula> doubler mode (DM) and 3$ tripler (TM) is proposed to increase the operation range power efficiency. The wideband RE-ILFM has common input output ports by switching working DM TM without any calibration. For TM, harmonic suppression technology...
This brief presents an overview of the recent progress on silicon-based millimeter-wave SoCs for short-range radar in imaging and sensing applications. The process, operating frequency, basic architectures are firstly summarized. Then, topology performance excellent reviewed from different applications: automotive radar, gesture recognition, vital signs monitoring, security biomedical sensing, industrial detection imaging. Future trends also discussed.
This article is mainly to investigate the responsivity ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">R<sub>v</sub></i> ) and noise equivalent power (NEP) performance of a 2.58 THz complementary metal-oxide-semiconductor (CMOS) detector under transistor parasitic capacitance effect between gate-source gate-drain with different distances. The was incorporated into existing response models explore enhanced response. A 4×8 terahertz (THz)...