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Articles 721 - 750 of 3518
Full-Text Articles in Engineering
A Study Of Coverlay Coated Microstrip Lines For Crosstalk Reduction In Ddr5, Qiang Ming Cai, Yuyu Zhu, Runren Zhang, Yinglei Ren, Xiaoning Ye, Jun Fan
A Study Of Coverlay Coated Microstrip Lines For Crosstalk Reduction In Ddr5, Qiang Ming Cai, Yuyu Zhu, Runren Zhang, Yinglei Ren, Xiaoning Ye, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Crosstalk becomes a serious problem in microstrip design of printed circuit boards (PCBs) in DDR5. In high-density and high-speed PCBs, widening space or putting shielding between traces to mitigate crosstalk noise may become less effective, because of the limited space. This paper presents a simple and efficient crosstalk reduction approach by using coverlay coated microstrip lines. This coverlay is available in a variety of film and adhesive thicknesses, which is commonly used materials for the resistance welding transform in PCB production. Based on the simulated S-parameters, the FEXT keeps under -40 dB from dc to 16.0 GHz, and more than …
Sensitivity Analysis Of Local Soldermask And Coverlay In High Speed Transimission Lines For Ddr5 Applications To Reduce Fext, Zhu Lin, Xin Cao, Qiang Ming Cai, Yinglei Ren, Xiaoning Ye, Jun Fan
Sensitivity Analysis Of Local Soldermask And Coverlay In High Speed Transimission Lines For Ddr5 Applications To Reduce Fext, Zhu Lin, Xin Cao, Qiang Ming Cai, Yinglei Ren, Xiaoning Ye, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
This article investigated the effects of local solder-mask and overlay structure changes on crosstalk. This structure is based on a four-layer high-speed PCB on a computer DDR5 board. Our goal is to use the obtained simulation results to locate the optimal response that not only meets the performance requirements but is also robust to geometric changes caused by manufacturing tolerances. These two methods have a good correlation with the simulation results and show strong capabilities in the practical applications.
Predicting The Conducted Emission Of A Crm Pfc Below 1mhz By Transient Modeling, Hongseok Kim, Jiayi He, Chunyu Wu, Nicholas Erickson, Sangho Cho, Dohyung Kim, Yeong Hur, Jun Fan
Predicting The Conducted Emission Of A Crm Pfc Below 1mhz By Transient Modeling, Hongseok Kim, Jiayi He, Chunyu Wu, Nicholas Erickson, Sangho Cho, Dohyung Kim, Yeong Hur, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Power Factor Corrections (PFC) are widely used in ac to dc power supplies. Modeling the PFC circuits and predicting the conducted emission (CE) are important in power supply designs. This paper introduces a transient model of a critical conduction mode (CRM) power factor correction. The control circuit of the PFC is built to achieve a CRM working condition with a constant on-time switching. The simulated time domain noise waveform is converted to the conducted EMI in frequency domain via short-time fast Fourier transform (STFFT). The simulated conducted EMI is compared to measured results below 1MHz.
A Novel Wideband Decoupling Network For Two Antennas Based On The Wilkinson Power Divider, Min Li, Lijun Jiang, Kwan Lawrence Yeung
A Novel Wideband Decoupling Network For Two Antennas Based On The Wilkinson Power Divider, Min Li, Lijun Jiang, Kwan Lawrence Yeung
Electrical and Computer Engineering Faculty Research & Creative Works
In this article, a wideband decoupling network (DN) is presented based on the Wilkinson power divider (WPD). The DN is composed of 2 two-way unequal WPDs, three transmission lines (TLs), and two reactive components. Two techniques are introduced for the wideband performance: 1) by using the WPD with high output isolation, the antenna matching becomes independent of antenna decoupling. So, the decoupled antennas with the proposed DN could perform broad impedance bandwidths without using matching networks and 2) the DN is designed to minimize antennas' coupling coefficients at two frequencies, which collectively contribute to a broader decoupling bandwidth. In addition, …
Enhanced Deep Learning Approach Based On The Deep Convolutional Encoder-Decoder Architecture For Electromagnetic Inverse Scattering Problems, He Ming Yao, Lijun Jiang, Wei E.I. Sha
Enhanced Deep Learning Approach Based On The Deep Convolutional Encoder-Decoder Architecture For Electromagnetic Inverse Scattering Problems, He Ming Yao, Lijun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
This letter proposes a novel deep learning (DL) approach to resolve the electromagnetic inverse scattering (EMIS) problems. The conventional approaches of resolving EMIS problems encounter assorted difficulties, such as high contrast, high computational cost, inevitable intrinsic nonlinearity, and strong ill-posedness. To surmount these difficulties, a novel DL approach is proposed based on a novel complex-valued deep fully convolutional neural network structure. The proposed complex-valued deep learning model for solving EMIS problems composes of an encoder network and its corresponding decoder network, followed by a final pixel-wise regression layer. The complex-valued encoder network extracts feature fragments from received scattered field data, …
An Algorithm For The Evolutionary-Fuzzy Generation Of On-Line Signature Hybrid Descriptors, Marcin Zalasinski, Krzysztof Cpalka, Lukasz Laskowski, Donald C. Wunsch, Krzystof Przybyszewski
An Algorithm For The Evolutionary-Fuzzy Generation Of On-Line Signature Hybrid Descriptors, Marcin Zalasinski, Krzysztof Cpalka, Lukasz Laskowski, Donald C. Wunsch, Krzystof Przybyszewski
Electrical and Computer Engineering Faculty Research & Creative Works
In biometrics, methods which are able to precisely adapt to the biometric features of users are much sought after. They use various methods of artificial intelligence, in particular methods from the group of soft computing. In this paper, we focus on on-line signature verification. Such signatures are complex objects described not only by the shape but also by the dynamics of the signing process. In standard devices used for signature acquisition (with an LCD touch screen) this dynamics may include pen velocity, but sometimes other types of signals are also available, e.g. pen pressure on the screen surface (e.g. in …
Availability-Resilient Control Of Uncertain Linear Stochastic Networked Control Systems, Chandreyee Bhowmick, S. Jagannathan
Availability-Resilient Control Of Uncertain Linear Stochastic Networked Control Systems, Chandreyee Bhowmick, S. Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
The resilient output feedback control of linear networked control (NCS) system with uncertain dynamics in the presence of Gaussian noise is presented under the denial of service (DoS) attacks on communication networks. The DoS attacks on the sensor-to-controller (S-C) and controller-to-actuator (C-A) networks induce random packet losses. The NCS is viewed as a jump linear system, where the linear NCS matrices are a function of induced losses that are considered unknown. A set of novel correlation detectors is introduced to detect packet drops in the network channels using the property of Gaussian noise. By using an augmented system representation, the …
Measurement Of The Amplitude And Phase Response Of Harmonic Products In Protection Diodes, Marcelo B. Perotoni, Omid Hoseini Izadi, David Pommerenke
Measurement Of The Amplitude And Phase Response Of Harmonic Products In Protection Diodes, Marcelo B. Perotoni, Omid Hoseini Izadi, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
This paper provides initial data from a measurement setup that captures not only the magnitude of unwanted harmonic signals created by TVS diodes but also measures their phase. Initial SPICE simulations are used for qualitative comparison. Goal is to use the phase information to gain in-sight into the mechanisms that create harmonics, not only for Transient Voltage Supressor diodes, but also for imperfect metallic contacts.
Decoupling Capacitor Placement Optimization With Lagrange Multiplier Method, Zhifei Xu, Jun Wang, Jun Fan
Decoupling Capacitor Placement Optimization With Lagrange Multiplier Method, Zhifei Xu, Jun Wang, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a decoupling capacitor placement optimization method based on the cavity model and Lagrange multiplier. The variable conditions associating with coordinates (x,y) of input impedance expression based on the cavity model are combined with the Lagrange multiplier method. The decoupling capacitor optimum placement within a defined area of the board can be found through the proposed analytical method. The example of finding an optimum location of the decoupling capacitor within a defined area of the power delivery network is exposed, the results are compared to the brute-force method to prove the effectiveness of the proposed method.
Dipole Source Reconstruction By Convolutional Neural Networks, Jiayi He, Qiaolei Huang, Jun Fan
Dipole Source Reconstruction By Convolutional Neural Networks, Jiayi He, Qiaolei Huang, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Equivalent dipole moments are widely used for noise source reconstruction in radio frequency interference (RFI) study. The equivalent dipole sources are usually extracted from measured near-field pattern. This paper introduces a machine learning based method to extract the dipole moments. A convolutional neural network is trained to perform a multi-label classification to determine the type of dipole moments. The locations of the dipole moments are obtained from the global averaging pooling layer. Then the magnitude and phase of the dipoles can be calculated from least square (LSQ) optimization. The proposed method is tested on simulated near-field patterns. The comparison between …
Asymptotic Analysis For Overlap In Waveform Relaxation Methods For Rc Type Circuits, Martin J. Gander, Pratik M. Kumbhar, Albert E. Ruehli
Asymptotic Analysis For Overlap In Waveform Relaxation Methods For Rc Type Circuits, Martin J. Gander, Pratik M. Kumbhar, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
Waveform relaxation (WR) methods are based on partitioning large circuits into sub-circuits which then are solved separately for multiple time steps in so called time windows, and an iteration is used to converge to the global circuit solution in each time window. Classical WR converges quite slowly, especially when long time windows are used. To overcome this issue, optimized WR (OWR) was introduced which is based on optimized transmission conditions that transfer information between the sub-circuits more efficiently than classical WR. We study here for the first time the influence of overlapping sub-circuits in both WR and OWR applied to …
Online Optimal Adaptive Control Of A Class Of Uncertain Nonlinear Discrete-Time Systems, Rohollah Moghadam, Pappa Natarajan, Krishnan Raghavan, Sarangapani Jagannathan
Online Optimal Adaptive Control Of A Class Of Uncertain Nonlinear Discrete-Time Systems, Rohollah Moghadam, Pappa Natarajan, Krishnan Raghavan, Sarangapani Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a multi-layer neural network (MNN) based online optimal adaptive regulation of a class of nonlinear discrete-time systems in affine form with uncertain internal dynamics is introduced. The multi-layer neural networks (MNN)-based actor-critic framework is utilized to estimate the optimal control input and cost function. The temporal difference (TD) error is derived from the difference between actual and estimated cost function. The MNN weights of both critic and actor are tuned at every sampling instant as a function of the instantaneous temporal difference and control policy errors. The proposed approach does not require the selection of any basis …
Empirical Modeling Of Contact Intermodulation Effect On Coaxial Connectors, Xiong Chen, Yongning He, Ming Yu, David J. Pommerenke, Jun Fan
Empirical Modeling Of Contact Intermodulation Effect On Coaxial Connectors, Xiong Chen, Yongning He, Ming Yu, David J. Pommerenke, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
An empirical modeling of contact nonlinearity-induced intermodulation (IM) effect on the coaxial connector is presented in this article. The IM weights on inner and outer conductors are clarified using the measurement method. The contact degeneration-induced IM evolution is quantized by considering the contact coupling effect between the inner and outer conductors. This article demonstrated a set of test methods to quantify the oxide-induced nonlinearity with contact degeneration effects, and these methods can evaluate the contact IM products and further predict the low IM lifetime of passive devices.
Electric Parameter Tuning Of Wireless Power Transfer Coil For Charging Interoperability Of Electric Vehicles, Dongwook Kim, Seungyoung Ahn, Qiusen He, Anfeng Huang, Jun Fan, Hongseok Kim
Electric Parameter Tuning Of Wireless Power Transfer Coil For Charging Interoperability Of Electric Vehicles, Dongwook Kim, Seungyoung Ahn, Qiusen He, Anfeng Huang, Jun Fan, Hongseok Kim
Electrical and Computer Engineering Faculty Research & Creative Works
The SAE J2954 recommended practice (RP) contains the power transfer frequency, electric values, and test procedure for the electric vehicle (EV) wireless power transfer (WPT). In particular, this document expresses the inductance range of the powering coil, the power receiving coil and the coupling coefficient (k) and the impedance values. It is very important that adhering the electrical parameters in the standard considering that the wireless charging system's compatibility. However, once the coil is processed, it is not easy to adjust the inductance of each powering coil, power receiving coil as well as the coupling coefficient of between transmitting coil …
The Effect Of The Parallel-Plate Mode On Striplines In Inhomogeneous Dielectric Media, Jiayi He, Shaohui Yong, Zurab Kiguradze, Arun Chada, Bhyrav Mutnury, James Drewniak
The Effect Of The Parallel-Plate Mode On Striplines In Inhomogeneous Dielectric Media, Jiayi He, Shaohui Yong, Zurab Kiguradze, Arun Chada, Bhyrav Mutnury, James Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
Strip lines are widely used in high speed printed circuit boards (PCB). When the strip line is in inhomogeneous dielectric media, its principal operation mode is quasi-TEM. In this case, the parallel-plate mode between two ground planes can be excited as a parasitic mode. This paper investigates the effect of this parasitic mode on strip lines through simulations. The simulated S-parameters of strip lines when this parallel-plate mode is excited and suppressed are compared. The measured S-parameters of strip lines with and without the ground stitching vias are also compared. The impact of the parasitic mode on time domain crosstalk …
Low Emf Design Of Cochlear Implant Wireless Power Transfer System Using A Shielding Coil, Seokwoo Hong, Seungtaek Jeong, Seongsoo Lee, Boogyo Sim, Hongseok Kim, Joungho Kim
Low Emf Design Of Cochlear Implant Wireless Power Transfer System Using A Shielding Coil, Seokwoo Hong, Seungtaek Jeong, Seongsoo Lee, Boogyo Sim, Hongseok Kim, Joungho Kim
Electrical and Computer Engineering Faculty Research & Creative Works
Wireless power transfer (WPT) technology is widely used for various applications because of convenience and safety. Especially, medical implant devices such as a cochlear implant are one of the typical applications of the WPT technology. However, WPT systems have problems with electromagnetic field (EMF) leakage, which can cause electro-magnetic interference (EMI) issues in the human body. In this paper, we propose an additional shielding coil for the effective suppression of EMF radiation of a WPT system. The proposed method reduces the EMF leakage in operating frequency range. We verified that the proposed shielding coil reduced the EMF leakage by 5.1 …
An Enhanced Deep Reinforcement Learning Algorithm For Decoupling Capacitor Selection In Power Distribution Network Design, Ling Zhang, Wenchang Huang, Jack Juang, Hank Lin, Bin Chyi Tseng, Chulsoon Hwang
An Enhanced Deep Reinforcement Learning Algorithm For Decoupling Capacitor Selection In Power Distribution Network Design, Ling Zhang, Wenchang Huang, Jack Juang, Hank Lin, Bin Chyi Tseng, Chulsoon Hwang
Electrical and Computer Engineering Faculty Research & Creative Works
The selection of decoupling capacitors (decap) is a critical but tedious process in power distribution network (PDN) design. In this paper, an improved decap-selection algorithm based on deep reinforcement learning (DRL), which seeks the minimum number of decaps through a self-exploration training to satisfy a given target impedance, is presented. Compared with the previous relevant work: the calculation speed of PDN impedance is significantly increased by adopting an impedance matrix reduction method; also, the enhanced algorithm performs a better convergence by utilizing the techniques of double Q-learning and prioritized experience replay; furthermore, a well-designed reward is proposed to facilitate long-term …
High-Speed Channel Equalization Applying Parallel Bayesian Machine Learning, Zurab Kiguradze, Nana Dikhaminjia, Mikheil Tsiklauri, Jiayi He, Bhyrav Mutnury, Arun Chada, James L. Drewniak
High-Speed Channel Equalization Applying Parallel Bayesian Machine Learning, Zurab Kiguradze, Nana Dikhaminjia, Mikheil Tsiklauri, Jiayi He, Bhyrav Mutnury, Arun Chada, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
Recovering attenuated signals caused by different issues including connections between connectors and chips of the devices, channel loss, and crosstalk is a challenging problem. Equalization is the most popular way to restore distorted signals. Different optimization algorithms are used to find the best tap coefficients for each equalization that improves eye opening and decreases the bit error rate (BER). Nowadays algorithms of equalization mainly operate to reduce the difference between input and output signals. In turn, this will increase eye height indirectly, but direct maximization of the eye height will restore the signal even better. The paper proposes a new …
Rfi Estimation For Multiple Noise Sources Due To Modulation At A Digital Mic Using Diople Moment Based Reciprocity, Shengxuan Xia, Jingdong Sun, Qiaolei Huang, Yansheng Wang, Hanfeng Wang, Ken Wu, Songping Wu, Jun Fan
Rfi Estimation For Multiple Noise Sources Due To Modulation At A Digital Mic Using Diople Moment Based Reciprocity, Shengxuan Xia, Jingdong Sun, Qiaolei Huang, Yansheng Wang, Hanfeng Wang, Ken Wu, Songping Wu, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
Non-ideal ground structures in flexible printed circuit board, such as the meshed ground or discrete ground nets, can cause severe RFI to the nearby antennas. Those RF radiators can be modeled as a set of equivalent dipole moment(s) when they are electrically small. Then, the dipole moment-based reciprocity theorem can be applied to estimate the noise coupling level. In this article, a practical methodology using the dipole moment-based reciprocity is proposed to identify multiple radiation sources of a real cellphone product. Multiple equivalent dipole moments are constructed with one-to-one correspondence to the physical structures. The reciprocity calculations can eventually provide …
Decoupling Capacitor Power Ground Via Layout Analysis For Multi-Layered Pcb Pdns, Biyao Zhao, Shuang Liang, Samuel Connor, Matteo Cocchini, Brice Achkir, Albert E. Ruehli, Bruce Archambeault, Jun Fan, James L. Drewniak
Decoupling Capacitor Power Ground Via Layout Analysis For Multi-Layered Pcb Pdns, Biyao Zhao, Shuang Liang, Samuel Connor, Matteo Cocchini, Brice Achkir, Albert E. Ruehli, Bruce Archambeault, Jun Fan, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
A modeling methodology to calculate the decoupling capacitor interconnect inductance in a multi-layer PCB is proposed herein. The methodology is based on the resonant cavity model of parallel planes. The self-inductance and mutual inductance are extracted to understand the via configuration influence on the effectiveness of decoupling capacitors. A special layout of decoupling capacitor is proposed to increase the effectiveness of the decoupling capacitors by taking maximum advantage of the mutual inductance between interconnect vias with two decoupling capacitors placed in a pair, and two pairs of power and ground vias placed in alternating directions as close as possible. The …
One-Dimensional Sensor Learns To Sense Three-Dimensional Space, Chen Zhu, Rex E. Gerald, Yizheng Chen, Jie Huang
One-Dimensional Sensor Learns To Sense Three-Dimensional Space, Chen Zhu, Rex E. Gerald, Yizheng Chen, Jie Huang
Electrical and Computer Engineering Faculty Research & Creative Works
A sensor system with ultra-high sensitivity, high resolution, rapid response time, and a high signal-to-noise ratio can produce raw data that is exceedingly rich in information, including signals that have the appearances of "noise". The "noise"feature directly correlates to measurands in orthogonal dimensions, and are simply manifestations of the off-diagonal elements of 2nd-order tensors that describe the spatial anisotropy of matter in physical structures and spaces. The use of machine learning techniques to extract useful meanings from the rich information afforded by ultra-sensitive one-dimensional sensors may offer the potential for probing mundane events for novel embedded phenomena. Inspired by our …
Channel Estimators For Full-Duplex Communication Using Orthogonal Pilot Sequences, Arul Mathi Maran Chandran, Lei Wang, Maciej Jan Zawodniok
Channel Estimators For Full-Duplex Communication Using Orthogonal Pilot Sequences, Arul Mathi Maran Chandran, Lei Wang, Maciej Jan Zawodniok
Electrical and Computer Engineering Faculty Research & Creative Works
Full-duplex communication is desirable to maximize the spectral efficiency, despite the challenges it puts forth. The key challenge inhibiting the operation of radios in full-duplex mode is self-interference. In this paper, we propose a pilot-based channel estimation to estimate both self-interference and communication channels simultaneously at both ends of a full-duplex link using orthogonal sequences. The Cramer-Rao Lower Bound for estimators of both the channels was determined and compared with the half-duplex channel estimator. We performed simulations varying sequence length and channel taps and studied the performance of the estimators. We also studied the effect of synchronization between the sequences …
A General And Systematic Method To Design Neutralization Lines For Isolation Enhancement In Mimo Antenna Arrays, Min Li, Lijun Jiang, Kwan Lawrence Yeung
A General And Systematic Method To Design Neutralization Lines For Isolation Enhancement In Mimo Antenna Arrays, Min Li, Lijun Jiang, Kwan Lawrence Yeung
Electrical and Computer Engineering Faculty Research & Creative Works
A general and systematic approach is the first time proposed in this paper to design the neutralization line (NL) for isolation enhancement in multiple-input multiple-output (MIMO) antenna arrays. Each NL consists of a metal strip and a reactive component attached at its middle position. It is connected with every two antenna radiators to generate an additional coupling path against the original antenna coupling for isolation enhancement. A general network model that leads to a systematic design procedure is developed to meet the required isolation criteria. Three practical examples are presented and used to verify the proposed NL-based decoupling technique (DT). …
Optical And Structural Properties Of Nickel Doped Zinc Oxide Grown By Metal Organic Chemical Vapor Deposition (Mocvd) At Different Reaction Chamber Conditions, Zahra Manzoor, Vishal Saravade, Alexis Margaret Corda, Ian Ferguson, Na Lu
Optical And Structural Properties Of Nickel Doped Zinc Oxide Grown By Metal Organic Chemical Vapor Deposition (Mocvd) At Different Reaction Chamber Conditions, Zahra Manzoor, Vishal Saravade, Alexis Margaret Corda, Ian Ferguson, Na Lu
Electrical and Computer Engineering Faculty Research & Creative Works
Metal organic chemical vapor deposition (MOCVD) growth of nickel-doped zinc oxide (Ni-doped ZnO) thin films on sapphire was investigated. The structural and optical properties were studied. The samples were grown at two substrate temperatures (i.e., 450 and 550°C) and at three chamber pressures (22, 30 and 100 Torr). The Ni-doped ZnO samples showed the (002) hexagonal crystal structure with signs of secondary phases in X-ray diffraction (XRD) measurements. However, different XRD peak intensities were observed for these samples at different growth conditions with the same Ni flow rate injection to the reaction chamber. The samples grown at different growth conditions …
Statistical Eye Diagram Analysis Based On Double-Edge Responses For Coding Buses, Xiuqin Chu, Wenwu Wang, Jun Wang, Xiangyu Dai, Jun Fan, Yushan Li
Statistical Eye Diagram Analysis Based On Double-Edge Responses For Coding Buses, Xiuqin Chu, Wenwu Wang, Jun Wang, Xiangyu Dai, Jun Fan, Yushan Li
Electrical and Computer Engineering Faculty Research & Creative Works
For high-speed coding buses, it is a great challenge to evaluate the eye diagram accurately. Assuming that all data bits are independent and have uniform probabilities as previous estimation methods have done is not valid. In this paper, a new statistical method is proposed to estimate the worst-case eye diagrams and bit-error-rate (BER) eye diagrams for coding buses. The probability distribution of coded bus bit vectors is modeled based on the coding rule constraints. Then, actual worst pattern and eye diagram calculation is derived based on bus bit transition probabilities and double-edge responses. In order to validate the method, a …
Rugged Linear Array For Iot Applications, Lidong Chi, Zi Bin Weng, Shu Meng, Yihong Qi, Jun Fan, Weihua Zhuang, James L. Drewniak
Rugged Linear Array For Iot Applications, Lidong Chi, Zi Bin Weng, Shu Meng, Yihong Qi, Jun Fan, Weihua Zhuang, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
In this article, a rugged linear array is proposed for covering both the LTE and 5G bands with an intermediate gain. The antenna is composed of a driven element, a set of directors, and a set of reflectors, where the excited element is a wideband high-efficiency electromagnetic structure (WHEMS) and the parasitic elements consist of metal rods. To achieve a rugged design, similar to the classic Yagi antenna, all of the elements should be conductively connected, so that it can be welded. The weldable mechanism is started on the driven radiating element. In addition, a balun is introduced in the …
Spectrum Analyzer-Based Phase Measurement For Near-Field Emi Scanning, Shubhankar Marathe, Zongyi Chen, Kaustav Ghosh, Hamed Kajbaf, Stephan Frei, Morten Sorensen, David Pommerenke, Jin Min
Spectrum Analyzer-Based Phase Measurement For Near-Field Emi Scanning, Shubhankar Marathe, Zongyi Chen, Kaustav Ghosh, Hamed Kajbaf, Stephan Frei, Morten Sorensen, David Pommerenke, Jin Min
Electrical and Computer Engineering Faculty Research & Creative Works
Often, electromagnetic interference (EMI) scanning applications require phase and magnitude information for the creation of equivalent radiation models and far-field predictions. Magnitude information can be obtained using a spectrum analyzer (SA), which is relatively inexpensive compared to phase resolving instruments such as vector network analyzers (VNAs) and oscilloscopes at tens of GHz. This paper introduces and optimizes a cost-effective SA-based phase measurement method and compares the results to a VNA and oscilloscope-based methods for EMI signal sources. The measured-phase distribution obtained from the three different instruments is additionally compared with the simulated phase determined from full-wave simulation. The three measurement …
Jet Ejection Following Drop Impact On Micropillared Hydrophilic Substrates, Anayet Ullah Siddique, Marcus Trimble, Feng Zhao, Mark M. Weislogel, Hua Tan
Jet Ejection Following Drop Impact On Micropillared Hydrophilic Substrates, Anayet Ullah Siddique, Marcus Trimble, Feng Zhao, Mark M. Weislogel, Hua Tan
Electrical and Computer Engineering Faculty Research & Creative Works
Droplet-wall interactions are well known to generate a wide variety of outcomes such as spreading, splashing, receding, jetting, and rebounding. In this paper, we focus on the evolution of jets that form during the recoil of impinging drops on partially wetting hydrophilic substrates composed of cylindrical micropillars. The impact of the millimeter-sized drops of water-glycerol mixtures on the micro structured hydrophilic substrates is investigated by high-speed video photography. Impact velocity and fluid viscosity are varied to characterize the jets. Wetting angles are maintained in the range of 43.6° ≤θ≤51.4°. A regime map is constructed to convey the jet behavior at …
Dc Ir-Drop Analysis Of Multilayered Power Distribution Network By Discontinuous Galerkin Method With Thermal Effects Incorporated, Ping Li, Min Tang, Zhi Xiang Huang, Li (Lijun) Jun Jiang, Hakan Bagci
Dc Ir-Drop Analysis Of Multilayered Power Distribution Network By Discontinuous Galerkin Method With Thermal Effects Incorporated, Ping Li, Min Tang, Zhi Xiang Huang, Li (Lijun) Jun Jiang, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
Due to the temperature-dependent resistivity of power distribution network (PDN) interconnects, a wiser and necessary strategy is to proceed the electrical-thermal cosimulation in order to include the thermal effects caused by Joule heating. As a natural domain decomposition method (DDM), in this article, a discontinuous Galerkin (DG) method is proposed to facilitate the steady-state electrical and thermal coanalysis. With the intention to avoid solving a globally coupled steady-state matrix system equations resulted from the implicit numerical flux in DG, the block Thomas method is deployed to solve the entire domain in a subdomain-by-subdomain scheme. As a direct solver, the block …
Software-Based Monitoring And Analysis Of A Usb Host Controller Subject To Electrostatic Discharge, Natasha Jarus, Antonio Sabatini, Pratik Maheshwari, Sahra Sedigh Sarvestani
Software-Based Monitoring And Analysis Of A Usb Host Controller Subject To Electrostatic Discharge, Natasha Jarus, Antonio Sabatini, Pratik Maheshwari, Sahra Sedigh Sarvestani
Electrical and Computer Engineering Faculty Research & Creative Works
Observing, understanding, and mitigating the effects of failure in embedded systems is essential for building dependable control systems. We develop a software-based monitoring methodology to further this goal. This methodology can be applied to any embedded system peripheral and allows the system to operate normally while the monitoring software is running. We use software to instrument the operating system kernel and record indicators of system behavior. By comparing those indicators against baseline indicators of normal system operation, faults can be detected, and appropriate action can be taken. We implement this methodology to detect faults caused by electrostatic discharge in a …