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1.4 kV 4H-SiC pin diode with a robust non-uniform floating guard ring termination

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Journal of Semiconductors 2014年第5期35卷 32-35页

作者：陈思哲盛况王珏 College of Electrical Engineering Zhejiang University Intersil Corp.

This paper presents the design and fabrication of an effective, robust and process-tolerant floating guard ring termination on high voltage 4H-SiC pin diodes. Different design factors were studied by numerical simulations and evaluated by device fabrication and measurement. The device fabrication was based on a 12 μm thick drift layer with an N-type doping concentration of 8 × 10^15 cm^-3. P^＋ regions in the termination structure and anode layer were formed by multiple aluminum implantations. The fabricated devices present a highest breakdown voltage of 1.4 kV, which is higher than the simulated value. For the fabricated 15 diodes in one chip, all of them exceeded the breakdown voltage of 1 kV and six of them reached the desired breakdown value of 1.2 kV.

关键词： silicon carbide pin diode field guarding rings edge termination

Motion of current filaments in avalanching pin diodes

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Journal of Semiconductors 2013年第4期34卷 37-41页

作者：任兴荣柴常春马振洋杨银堂乔丽萍史春蕾任利华 Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi'an 710071China

The motion of current filaments in avalanching pin diodes has been investigated in this paper by 2D transient numerical simulations. The simulation results show that the filament can move along the length of the pin diode back and forth when the self-heating effect is considered. The voltage waveform varies periodically due to the motion of the filament. The filament motion is driven by the temperature gradient in the filament due to the negative temperature dependence of the impact ionization rates. Contrary to the traditional understanding that current filamentation is a potential cause of thermal destruction, it is shown in this paper that the thermally-driven motion of current filaments leads to the homogenization of temperature in the diode and is expected to have a positive influence on the failure threshold of the pin diode.

关键词： pin diode moving current filament self-heating effects impact ionization thermal runaway

An Analysis of the Equivalent Resistance of pin diodes at Microwave Frequencies

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Journal of Electronic Science and Technology of China 2004年第2期2卷 23-25页

作者：杨国渝宋开军 School of Electronic Engineering UESTC Chengdu 610054 China

The forward bias equivalent resistance of pin diodes, an important parameter in applications, is usually measured at lower frequencies. But in fact, due to skin effect the effective conduction area of the region I of a pin diode decreases as the frequency increases. In this paper, the affection of skin effect to forward bias equivalent resistance is considered and an analytic expression of the equivalent resistance of the region I is presented. In result, the forward bias resistance of a pin diode at microwave frequencies is much higher than that at DC and low frequencies. It is necessary, therefore, to consider the skin effect of pin diodes in high frequency applications.

关键词： the forward bias resistance skin effect pin diode microwave Kelvin functions

Characteristic Mode Design of Dual-Band Reconfigurable Frequency Selective Surface

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Chinese Journal of Electronics 2022年第6期31卷 1129-1137页

作者： NING Zihao LI Mengmeng DING Dazhi AI Xia LIU Jiaqi Department of Communication Engineering Nanjing University of Science and Technology National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics

In this paper, a characteristic mode design of dual-band reconfigurable frequency selective surface(RFSS) with transmission/reflection band is presented. Through the visualization of modal behavior, the theory of characteristic modes(TCM) is used to guide design from a physical perspective. At first, the dominant modes of two basic structures that have a major impact on reflection are clarified by observing the modal *** appropriate combination of the two structures forms an initial element with bandpass properties. Then, the positive-intrinsic-negative(pin) diode is placed in the middle of the microstrip line and as the state shifts from ON to OFF, the dominant mode resonant frequency of the microstrip line shifts upward. Such a feature can be used to design the transmission/reflection RFSS. Experimentally, a dual-band RFSS operating at 8.8 GHz and 10.4 GHz is designed and fabricated. The measured results that agree with the full-wave simulation validate the proposed TCM-based design.

关键词： dual-band reconfigurable frequency selective surface dual-band RFSS positive-intrinsic-negative diode theory of characteristic modes characteristic mode design full-wave simulation transmission band p-i-n diodes modal behavior visualization bandpass properties microstrip lines microstrip line dominant mode resonant frequency pin diode microwave filters frequency selective surfaces TCM-based design reflection band transmission RFSS microwave diodes band-pass filters microstrip filters reflection RFSS

Optimized online filter stack spectrometer for ultrashort X-ray pulses

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Nuclear Science and Techniques 2024年第5期35卷 85-98页

作者： Jia-Xing Wen Ge Ma Ming-Hai Yu Yu-Chi Wu Yong-Hong Yan Shao-Yi Wang Huai-Zhong Gao Lu-Shan Wang Yu-Gang Zhou Qiang Li Yue Yang Fang Tan Xiao-Hui Zhang Jie Zhang Wen-Bo Mo Jing-Qin Su Wei-Min Zhou Yu-Qiu Gu Ming Zeng Zong-Qing Zhao Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEPMianyang 621900China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

Currently,with the advent of high-repetition-rate laser-plasma experiments,the demand for online diagnosis for the X-ray spectrum is increasing because the laser-plasma-generated X-ray spectrum is very important for characterizing electron dynamics and *** this study,scintillators and silicon pin(P-type–intrinsic-N-type semiconductor)diodes were used to construct a wideband online filter stack *** X-ray sensor and filter arrangement was optimized using a genetic algorithm to minimize the condition number of the response ***,the unfolding error was significantly reduced based on numerical *** detector responses were quantitatively calibrated by irradiating the scintillator and pin diode with various nuclides and comparing the measuredγ-ray peaks.A prototype 15-channel spectrometer was developed by integrating an X-ray detector with front-and back-end *** prototype spectrometer could record X-ray pulse signals at a repetition rate of 1 ***,an optimized spectrometer was employed to record the real-time spectra of laser-driven bremsstrahlung *** optimized spectrometer offers a compact solution for spectrum diagnostics of ultrashort X-ray pulses,exhibiting improved accuracy in terms of spectrum measurements and repetition rates,and could be widely used in next-generation high-repetition-rate high-power laser facilities.

关键词： Filter stack spectrometer Laser plasma diagnostics X-ray diagnostics Scintillator pin diode

Frequency Reconfigurable Antenna for Multi Standard Wireless and Mobile Communication Systems

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Computers, Materials & Continua 2021年第8期68卷 2563-2578页

作者： Ikhlas Ahmad Haris Dildar Wasi Ur Rehman Khan Sadiq Ullah Shakir Ullah Mahmoud AAlbreem Mohammed HAlsharif Peerapong Uthansakul Department of Telecommunication Engineering University of Engineering&TechnologyMardan23200Pakistan Department of Electronics and Communications Engineering A’Sharqiyah UniversityIbra 400Oman Department of Electrical Engineering College of Electronics and Information EngineeringSejong UniversitySeoul05006Korea School of Telecommunication Engineering Suranaree University of TechnologyNakhon RatchasimaThailand

In this paper,low profile frequency reconfigurable monopole antenna is designed on FR-4 substrate with a compact size of 30 mm^(3)×20 mm^(3)×1.6 mm^(3).The antenna is tuned to four different modes through three pin diode *** Mode 1(SW1 to SW3=OFF),antenna covers a wideband of 3.15–8.51 *** Mode 2(SW1=ON,SW2 to SW3=OFF),the proposed antenna resonates at 3.5 *** antenna shows dual band behavior and covers 2.6 and 6.4 GHz in Mode 3(SW1 and SW2=ON,SW3=OFF).The same antenna covers three different bands of 2.1,5 and 6.4 GHz when operating in Mode 4(SW1 to SW3=ON).The proposed antenna has good radiation efficiency ranges from 70%∼84%,providing adequate average gain of 2.05 dBi in mode 1,1.87 dBi in mode 2,1.4–1.75 dBi in mode 3 and 1.05–1.56 dBi in mode *** achieved impedance bandwidths at respective frequencies ranges from 240 to 5000 *** Voltage Standing Waves Ratio(VSWR)of less than 1.5 is achieved for all operating *** validate the simulation results,the proposed antenna is fabricated and experimentally tested in antenna measurement *** to its reasonably small size and support of multiple bands operation,the proposed antenna can be used in modern communication systems for supporting various applications such as fifth generation(5G)mobile and wireless local area networks(WLAN).

关键词： Reconfigurable antenna pin diode communication systems 5G WLAN

Cactus-Shaped Frequency Reconfigurable Antenna for Sub 10 GHz Wireless Applications

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Computer Systems Science & Engineering 2023年第6期45卷 2693-2704页

作者： Muhammad Irfan Wasi Ur Rehman Khan Sadiq Ullah Naveed Mufti Muhammad Fawad Khan Rizwan Ullah Usman Ali Fazal Muhammad Faisal Althobiani Mohammed Alshareef Shadi Alghaffari Saifur Rehman V.R.Shamji Electrical Engineering Department College of EngineeringNajran UniversitySaudi Arabia Department of Telecommunication Engineering University of Engineering and TechnologyMardanKPPakistan Department of Electrical Engineering University of Engineering and TechnologyMardanKPPakistan Faculty of Maritimes Studies King Abdulaziz UniversityJeddahSaudi Arabia Ports&Maritime Transportation Faculty of Maritimes StudiesKing Abdulaziz UniversityJeddahSaudi Arabia Faculty of Maritime Studies King Abdulaziz UniversityJeddahSaudi Arabia

This paper presents,a novel cactus shaped frequency reconfigurable antenna for sub 10 GHz wireless *** diode is utilized as an electrical switch to achieve reconfigurability,enabling operation in four different frequency *** the switch ON state mode,the antenna supports 2177-3431 and 6301-8467 MHz ***,the antenna resonates within 2329-3431 and 4951-6718 MHz while in the OFF state *** efficiency values,ranging from 68%to 84%,and gain values,ranging from 1.6 to 4 dB,in the operating frequency *** proposed antenna satisfy the practical requirements and *** overall planner dimensions of the proposed antenna model is 40×21 mm^(2).Moreover,the measurement results from the prototype support the simulation *** on the frequency ranges supported by the antenna,it can be used for multiple wireless standards and services,including Worldwide interoperability and Microwave Access(WiMAX),Wireless Fidelity(Wi-Fi),Bluetooth,Long Term Evolution(LTE)and satellite *** increases its applicability for use in mobile terminals.

关键词： Antenna frequency reconfigurable pin diode switch wireless technology

Conversion of Common-Frequency Absorption/Transmission Based on Semiconductor Switch

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Conversion of Common-Frequency Absorption/Transmission Based...

A Multiband Frequency Reconfigurable Antenna for Wireless Communication

2021年全国天线年会

作者： Caijie Dong Lina Zhu Zengtao Wang Jianjia Yi Xidian University Xi'an Jiaotong University

In this paper,a novel design is proposed that can realize the switch between absorption and transmission mode in the same *** structure comprises periodic arrays of metallic patterns imprinted on both sides of an FR4 ***,the varactors and pin diodes are embedded on the top and bottom layers,*** modulating responses of active components,the full-wave simulations validate the performance of conversion of the same frequency absorption and transmission modes under normal *** proposed structure has been fabricated,and the experimental results are in good agreement with the numerical simulation results under normal incidence.

关键词： Active frequency-selective surface multifunction pin diode varactor

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A Multiband Frequency Reconfigurable Antenna for Wireless Co...