Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]最新文献_第9页

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851662

I. El-Babli, A. Sebak

{"title":"Using the unrelated illumination method in the reconstruction of three dimensional dielectric bodies","authors":"I. El-Babli, A. Sebak","doi":"10.1109/ANTEM.2000.7851662","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851662","url":null,"abstract":"In the last decade several numerical techniques have been developed for solving the inverse electromagnetic scattering problems and microwave imaging of inhomogeneous dielectric bodies. In particular two approaches have been utilized. The first is the microwave diffraction tomography [1]. This approach is based on the generalization of the classical x-ray computed tomography by taking into consideration the diffraction effects. This method can only handle low contrast dielectric bodies. The second approach aims to solve the exact equation of the electromagnetic inverse scattering problem by numerical methods such as the method of moments (MoM) [2]. In the MoM, the problem solution is reduced to the solution of linear system of algebraic equations. Unfortunately the scattering matrix that governs the external scattered field induced by an internal equivalent current is highly ill-conditioned. Thus any attempt to compute its inverse makes the system ill-posed especially in the presence of noise. Several regularization techniques have been used [3], [4] aiming to reduce the effect of the ill-conditioning. These employ priori information either to select a suitable regularization parameter or to enforce convergence in iterative techniques. Moreover, most of these techniques require the presence of a few number of scatterers and employ multiview illumination and some are only applicable to two-dimensional problems.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133773428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Physical modeling of linear systems of equations 线性方程组的物理建模

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851657

I. Ciric

引用次数: 1

A monolithic low noise amplifier antenna 单片低噪声放大天线

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851712

L. Roy, Patrick DiFazio, N. Gagnon

引用次数: 0

An X-band microstrip VCO with 900MHz tuning range 具有900MHz调谐范围的x波段微带VCO

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851701

M. K. Ozdemir, Te-Hsin Huang, E. Arvas

{"title":"An X-band microstrip VCO with 900MHz tuning range","authors":"M. K. Ozdemir, Te-Hsin Huang, E. Arvas","doi":"10.1109/ANTEM.2000.7851701","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851701","url":null,"abstract":"A low phase-noise, microwave voltage controlled oscillator (VCO) is built to operate between 7.8GHz and 8.7GHz. The circuit is built on Roger RO6002 with a thickness of 20 mils, and a dielectric constant of 2.94. The loss tangent of the substrate is 0.0009. The active element used is a dual emitter Infineon (former Siemens) BFP420 low noise bipolar transistor. It is in a SOT-343 package and used in a common collector configuration. The oscillator circuit contains both coarse and fine tune controls. An active bias circuit is used to power the oscillator. The output is loosely coupled, resulting in better phase noise. Two varactors used in the coarse tune circuit are connected back-to-back to improve the noise performance. As the coarse tune voltage is changed from −1.0Vdc to −19.0Vdc, the frequency of oscillation changes from 7.8GHz to 8.7GHz. For a fixed coarse tune voltage, when the fine tune voltage is changed from 6.5V dc to 13.5V dc, the oscillation frequency varies by about 5MHz per volt. The circuit was designed using the small signal scattering parameters (s-parameters) of the transistor provided by the manufacturer. The circuit prototype, including the impedance matching sections, was simulated using Serenade, Ansoft Ensemble, and other simulators.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"650 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115830982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Microwave stimulation of active points and its effect on electrical activity of brain fields 微波刺激脑活动点及其对脑电活动的影响

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851727

T. Sulima, O. Sulima

引用次数: 0

Diversity: An efficient means for reducing error rates in building-scattered LMCS data transmissions at rates of hundreds of megabits per second 分集:在以每秒数百兆比特的速率传输建筑物分散的LMCS数据时，降低错误率的有效手段

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851688

J. LeBel

引用次数: 2

Tools for electromagnetic modeling and visualization using the FDTD technique 使用FDTD技术进行电磁建模和可视化的工具

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851669

A. Elsherbeni, A. Glisson, C. Riley, Charles E. Smith

{"title":"Tools for electromagnetic modeling and visualization using the FDTD technique","authors":"A. Elsherbeni, A. Glisson, C. Riley, Charles E. Smith","doi":"10.1109/ANTEM.2000.7851669","DOIUrl":"https://doi.org/10.1109/ANTEM.2000.7851669","url":null,"abstract":"Because of the invisible nature of electromagnetic waves, the tasks of analyzing, modeling, and designing of antennas and microwave devices are less manageable than the design of other types of electronic circuits or devices. Efforts have been focused on building tools for visualizing electromagnetic waves emerging from canonical and simple structures. With lesser success, there are a few modeling tools available for a true analysis of practical EM designs. However, the majority of such available tools are basically commercial in nature and are cost prohibitive to the researchers in the academic environment. This paper provides an overview of several graphical user interfaces (GUIs) developed for electromagnetic computational tools for the finite difference time domain (FDTD) technique. These user interfaces overcome the major difficulties that slow down the EM analysis process. The main tasks of these GUIs are to simplify the process of describing a composite structure to the computational engine, to provide real-time visualization of the generated fields and other related parameters, and to allow for post processing of the computed field values. Tools for 1D, 2D FDTD, and 3D FDTD interface, are presented.","PeriodicalId":416991,"journal":{"name":"Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000]","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132730814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A low-noise MMIC amplifier as a microwave-to-optics link 作为微波-光学链路的低噪声MMIC放大器

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851749

E. Zencir, E. Arvas, R. Michalak

引用次数: 0

Mutual coupling factor of rectangular loops in rectangular coaxial cavities 矩形同轴腔中矩形回路的互耦系数

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851648

A. Borji, S. Safavi-Naeini, S. Chaudhuri

引用次数: 2

Scan range enhancement using WAIM sheets for infinite planar waveguide phased array antennas 无限平面波导相控阵天线的WAIM片扫描范围增强

Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2000] Pub Date : 2000-07-01 DOI: 10.1109/ANTEM.2000.7851717

Satish K. Sharma, A. Sebak, L. Shafai

引用次数: 2