Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle

Shanghai, China

Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle

Shanghai, China

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Ying X.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Liao Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Shi G.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Zhang Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
ISAPE 2016 - Proceedings of the 11th International Symposium on Antennas, Propagation and EM Theory | Year: 2016

Electromagnetic environment has become more complex due to the rapid development of modern electronic techniques, and electromagnetic compatibility (EMC) problems caused by outside interference have become a big issue for many devices, and cannot be ignored. To minimize the impact from outer electromagnetic interference, metallic enclosure is widely used as a shield. Therefore, shielding effectiveness (SE) of enclosure becomes a critical factor that affects EMC of equipment. In this paper, a rectangular enclosure with a rectangular aperture is studied, and an equivalent circuit model for SE evaluation is built via a vector fitting (VF) tool. The equivalent circuit saves time and calculating resource during simulation, and can be used to predict the SE performance efficiently. Also, equivalent circuit offers a new angle of view for better SE comprehension, and is applied to control SE of the rectangular enclosure. © 2016 IEEE.


Tian X.,Shanghai JiaoTong University | Xiao G.,Shanghai JiaoTong University | Fang J.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2013

New and concise analytical formulae for calculating time domain potentials from Rao-Wilton-Glisson (RWG) type sources are derived in this paper, which can be applied to efficiently evaluate the interaction between two RWG elements in time domain, as is required in methods such as marching-on-in-time (MOT) for time-domain-integral-equations (TDIEs). Compared with previous analytical expressions, formulae in this paper are readily deduced through the RWG coordinates which are very compact to program without finding and paring the intersecting points between the concentric time spheres and the RWG triangles or categorizing the geometric relations of the observation point and the triangles into different occasions. Undifferentiated EFIE, MFIE and CFIE are applied to provide numerical examples that verify the efficacy of these formulae. © 2013 IEEE.


Yi L.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Ying X.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Shi G.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Yi W.,Wuhan Mechanical Technology College
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies, MAPE 2015 | Year: 2015

The dipole antennas are widely used for RF communication applications and usually provide a potential front-door path of coupling electromagnetic pulse (EMP). In this paper, the transient current response of dipoles exposed to EMP is calculated with an equivalent circuit based model, which consists of an equivalent pulse voltage source and an antenna equivalent circuit. A center-driven wire dipole and a normal mode helical antenna are utilized for validate the circuit models. The results from the circuit based models agree well with data obtained from full numerical solution of the actual antennas. They takes only a few seconds to calculate the transient response with circuit models, which could also be directly connected to RF front-end circuits of communication system for electromagnetic susceptibility assessment. © 2015 IEEE.


Ying X.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Yi L.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Shi G.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Chen A.,Beihang University
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies, MAPE 2015 | Year: 2015

Ringing signal has widely existed in digital circuits like integrated circuits, DC-DC circuits, etc. The ringing appears in the roads due to the parasitic effect in high frequency or the impedance mismatch, and may cause logical errors in signal processing, as well as electromagnetic interference (EMI) to other devices. To have a deeper understanding of the electromagnetic characteristics, we analyze the generic causes of ringing, and formulate its mathematic time-domain expression. Based on the time-domain formulations, a study of spectrum characteristics for ringing is made with the aid of Fourier transform, trying to find out ring's electromagnetic features. We also study the square wave signal's properties in time-frequency domain. Comparisons between ringing and square wave have been made, in order to support the electromagnetic compatibility (EMC) design of circuits. © 2015 IEEE.


Liang Z.C.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Gao W.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Wang X.-B.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
Applied Mechanics and Materials | Year: 2013

According to the matrix relationship between the induced source and an incident wave in the electromagnetic scattering theory, the formula connecting the scattering center parameters and the matrix element are deducted, and matrix diagonalization and aggregation approximation of the induced source and the incident wave is pointed as the main establish condition of scattering center. Based on the conclusion, the scattering center distribution of a metal plate is given; the RCS error of the scattering center approximate model is analyzed. It is demonstrated that the approximate establish condition of the scattering center is valid. © (2013) Trans Tech Publications, Switzerland.


Liao Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Cai K.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Hubing T.H.,Clemson University | Wang X.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
IEEE Transactions on Antennas and Propagation | Year: 2014

An equivalent circuit consisting of eight frequency independent lumped elements is derived for center-driven normal mode helical antennas. The equivalent circuit is composed of two parts; a five-element circuit representing the wire antenna and a three-element circuit for the helical turns. Comparison of the calculated input impedance of the equivalent circuit with full-wave simulations demonstrates reasonable agreement over a broad frequency range that includes the first resonant frequency, where the antenna usually operates. Application of the equivalent circuit does not require an EM solver and it is readily implemented in circuit simulators. © 2014 IEEE.


Liao Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Zhang Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Cai K.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Liang Z.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
ISAP 2013 - Proceedings of the 2013 International Symposium on Antennas and Propagation | Year: 2013

The normal mode helical antenna (NMHA) is widely used on RFID applications because it fits well with the requirements of smaller physical size and high inductive impedance. In this paper, a power transmission coefficient method of mapping a modified impedance function onto the conventional Smith chart is applied to conjugate matching design between NMHA and chips. Moreover, the effect of various geometrical parameters of NMHA on resonant frequency and input impedance is investigated. Some significant characteristics of NMHA in the Smith chart are obtained by varying each parameter. It could provide an effective guidance to tune the antenna to desirable complex impedance in the Smith chart. Finally, impedance matching design of a specific NMHA is conducted according to the previously mentioned method. © 2013 Antenna Society of the Chinese Institute of Electronics.


Liao Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Zhang Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Cai K.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
Progress in Electromagnetics Research Symposium | Year: 2014

The purpose of this paper is to investigate the use of equivalent-layer models for the analysis of finite-size carbon-fiber composite materials. A macroscopically equivalent model based on the homogenization technique, which is a more efficient method for analyzing fiber composite is investigated. Finite size composite slabs, consist of loose carbon fibers mixed with resins, are used to validate the equivalent models. Different thicknesses and sizes of the slabs, as well as relative volume of carbon fibers are considered. It is found that the breakdown frequencies of equivalent models vary significantly with the various geometries. It is important to validate the equivalent models of each finite-size composite block before simplifying them in the whole large structure model.


Li X.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Min W.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Yao F.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Zhu L.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies, MAPE 2015 | Year: 2015

Based on the substrate integrated waveguide (SIW) technology, a two-layer slot array working at Ka band is designed by transferring the conventional waveguide resonant slot array antenna to the substrate integrated waveguide structure., which fed by standard metallic waveguide. The integration of the slotted-waveguide array with the feeding network is an important goal in the design process. Reduced size of the antenna can be obtained using multilayered substrates, the power divider can be integrated in different layers at the bottom of the slot array antenna by coupling inclined slots. with the characters of small, light weight, simple framework, it can be easy for produce. © 2015 IEEE.


Liao Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Zhang Y.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle | Shi G.,Shanghai Key Laboratory of Electromagnetic Environmental Effects for Aerospace Vehicle
2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2015 - Proceedings | Year: 2015

The normal mode helical antenna (NMHA) is widely used for RF communication applications and usually provides a potential front door path of coupling electromagnetic pulse (EMP). Many numerical methods are employed to analyze the transient response of antennas under EMP, such as time-domain finite difference (FDTD) and time domain integral equation (TDIF) methods. While the numerical methods give accurate results, they can be time-consuming and only provide snapshots of EMP response in very specific circumstances. In addition, the transient data obtained from numerical tools is often required to be handled for the subsequent EMP vulnerability assessment in the RF front end circuits of communication system. The analysis of transient response for communication systems in the presence of EMP was usually complicated in the traditional field-circuit method. © 2015 IEEE.

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