2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)最新文献_第7页

A planar near-field measurement system of UWB antennas for medical diagnostics 医学诊断用超宽带天线平面近场测量系统

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324934

Xuyang Li, K. Sam, W. Wiesbeck, T. Zwick

引用次数: 0

Spectral imaging for complex clinical breast structures 临床复杂乳腺结构的光谱成像

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324907

P. Meaney, Amir H. Golnabi, M. Pallone, N. Epstein, P. Kaufman, S. Geimer, K. Paulsen

{"title":"Spectral imaging for complex clinical breast structures","authors":"P. Meaney, Amir H. Golnabi, M. Pallone, N. Epstein, P. Kaufman, S. Geimer, K. Paulsen","doi":"10.1109/APWC.2012.6324907","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324907","url":null,"abstract":"We have imaged several breast cancer patients at multiple intervals during her neoadjuvant chemotherapy to assess the capability of microwave tomography as a therapy monitoring device. For the patient discussed here, we illustrate the spectral behavior of our tomographic approach in the context of a complex imaging situation with a large scattering tumor along with less frequently encountered structures such as thickened skin in the tumor vicinity. These results demonstrate that the microwave technology is sensitive to dielectric property perturbations associated with treatment-induced physiological changes. In addition, it also confirms previously hypothesized notions that the lower frequency images provide lower resolution but useful counterparts to the enhanced resolution, higher frequency images. This spectral data can be instructive for both UWB radar approaches and multi-frequency or time-domain tomographic approaches. The chemotherapy patients are unique with respect to breast cancer imaging cases in that they usually involve electrically large tumors along with other non-standard features such as extra-thick skin (easily as thick as 1 cm). These large, high contrast features are quite challenging for all types of microwave imaging (radar and tomography-based) and form an important benchmark for testing imaging techniques. For our efforts, we have developed a log transformation as part of the image reconstruction process which we have shown to have superior convergence behavior (i.e. no local minima) while retaining phase wrapping information that is generally lost when only considering more classical minimization criteria. As we will show, this technique requires broadband scattering data which we provide from measurements using our ultrawideband monopole antennas.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77942129","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

Insights into factors contributing to the observability of a submarine at periscope depth by modern radar: Part 2 - EM simulation of mast RCS in a realistic sea surface environment 现代雷达对潜望镜深度下潜艇可观测性的影响因素:第2部分-真实海面环境下桅杆RCS的EM模拟

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324977

J. C. Smit, J. Cilliers

引用次数: 4

Insights into factors contributing to the observability of a submarine at periscope depth by modern radar. part 1 - high resolution measurements 现代雷达对潜望镜深度下潜艇可观测性的影响因素的洞察。第1部分:高分辨率测量

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324976

F. Anderson, K. Naicker, J. Mocke

引用次数: 1

One-dimensional beam scanning reflector antenna for small satellite applications 用于小卫星的一维波束扫描反射天线

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324903

M. Takikawa, Y. Inasawa, Y. Konishi

引用次数: 1

Hybrid elliptic TEM horn with internal fins 带有内翅片的混合椭圆TEM角

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324982

J. Malherbe

引用次数: 4

GTD and PTD at DTU DTU的GTD和PTD

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324988

O. Breinbjerg

引用次数: 1

Can ultrawideband antennas be miniaturized effectively by dielectric loading? 超宽带天线能否通过介质加载有效小型化?

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324924

Yifei Shi, A. Amert, K. Whites

引用次数: 5

Variations on loop and Adcock array topologies for improved radio direction finding performance 改进无线电测向性能的环路和Adcock阵列拓扑的变化

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324979

C. Vale

引用次数: 1

GTD, UTD, UAT and STD: A Historical Revisit GTD, UTD, UAT和STD:历史回顾

2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC) Pub Date : 2012-10-08 DOI: 10.1109/APWC.2012.6324957

Y. Rahmat-Samii

{"title":"GTD, UTD, UAT and STD: A Historical Revisit","authors":"Y. Rahmat-Samii","doi":"10.1109/APWC.2012.6324957","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324957","url":null,"abstract":"In his landmark paper dated February 1962, Prof. Keller introduced the notion of Keller's cone and stated, “Geometrical optics, the oldest and most widely used theory of light propagation, fails to account for certain optical phenomena called diffraction...”. I had a personal encounter with Keller's cone at a hotel in Florida! In an early morning on October 14, 2007, I witnessed Keller's cone on the door of my hotel room resulting from edge diffraction from a TV stand due to the sun rays coming through an opening of a window curtain. By now we know how to construct the local plane wave behavior of the diffracted field along the diffracted rays by invoking the fact that an edge forms one of the caustics of the diffracted wave front. We also know that the diffracted field is of the order of k-1/2 in comparison to the geometrical optics field which is of the order of k0. In many antenna and scattering problems this added diffracted term enhances the accuracy of the total field immensely. Due to the boundary layer properties of the diffracted ray field, along the incident and shadow boundaries and also caustics the original form of Keller's construction fails. This shortcoming has been overcome through construction of the Uniform Theory of Diffraction (UTD by Kouyoujian and Pathak), Uniform Asymptotic Theory (UAT by Ahluwalia, Beorsma, Lewis, Lee and Deschamps) and the Spectral Theory of Diffraction (STD by Rahmat-Samii and Mittra). An overview and salient features of these theories are revisited in a novel and unified manner.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86719897","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: 4