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Microwave Thermal Ablation Near Metallic Bronchial Prostheses: Numerical Models and Experiments 金属支气管假体附近的微波热消融:数值模型与实验
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597684
L. Capineri, M. Dimitri, G. B. Gentili
{"title":"Microwave Thermal Ablation Near Metallic Bronchial Prostheses: Numerical Models and Experiments","authors":"L. Capineri, M. Dimitri, G. B. Gentili","doi":"10.23919/PIERS.2018.8597684","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597684","url":null,"abstract":"The microwave ablation processes are now extensively used for minimally-invasive interventions on the liver, kidney, lung and other organs using a laparoscopic approach. There is a wide scientific literature focused on the results and clinical expectations of these processes, describing in detail all aspects of the methodology with the aid of numerical simulations or trials on ex-vivo and in-vivo tissues. One aspect not yet explored concerns the electromagnetic (EM) interaction between a microwave antenna and nearby metallic implants that could interfere with the device's radiation mechanism. An example is the transbronchial thermal ablation of the lung tumor tissue that surrounds or invades a metallic bronchial prosthesis. The paper aims to fill this gap by presenting: •the electromagnetic analysis of the applicator-prosthesis interaction; •the transient thermal simulation; •the comparison between the numerical results and those obtained from experiments on an ex-vivo phantom. Simulations firstly analyse the EM interaction of a microwave (MW) applicator with a 12 mm diameter tubular bronchial stent made of a metallic grid. The results show that when the applicator is located in close proximity of the stent or even internally to it, its operation is not substantially perturbed; in fact the reflection coefficient of the applicator is kept below −10 dB in any case. The thermal transient analysis shows that the heating profiles obtained by applying 50 W of input MW power for 60 seconds (3 kJ of energy) are compatible with the clinical needs of obtaining very localized thermal ablations without damaging the surrounding healthy tissues. The experiments performed using a phantom made of fresh ex vivo porcine loin confirm the EM and thermal simulation results.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131641383","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
Investigation of Low-Profile RFID Antenna Using AMC Substrate for Anti-Metallic Application 基于AMC基板的低轮廓RFID天线抗金属应用研究
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598043
Wang He, Bo Xu
{"title":"Investigation of Low-Profile RFID Antenna Using AMC Substrate for Anti-Metallic Application","authors":"Wang He, Bo Xu","doi":"10.23919/PIERS.2018.8598043","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598043","url":null,"abstract":"A low-profile radio frequency identification (RFID) tag antenna mounted on an artificial magnetic conductor (AMC) substrate is investigated for the anti-metal application. The AMC substrate consists of two rectangular patches and a metal ground, which is used to reduce the profile as well as enhance the insensitivity to the metal object. The anti-metal mechanism is studied through the near-field coupling behavior. The gain of final configuration is 4.1 dBi, and the total size is 130mm×60mm×3 mm.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131823448","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
Numerical Study of Hyperthermia Applicator System for Tumor Treatment in Head and Neck Region 头颈部肿瘤热疗应用系统的数值研究
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597679
O. Fiser, I. Merunka, J. Vrba
{"title":"Numerical Study of Hyperthermia Applicator System for Tumor Treatment in Head and Neck Region","authors":"O. Fiser, I. Merunka, J. Vrba","doi":"10.23919/PIERS.2018.8597679","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597679","url":null,"abstract":"The purpose of this contribution is to study the influence of the number of waveguide applicators for the hyperthermia treatment in the head and neck region. The number of applicators observing the SAR distribution in the target of the simple phantom was changing from one to five. The influence of the optimization of the amplitudes and phases for the microwave energy steering was observed. The best result was achieved for four applicators when the difference between optimized and non-optimized SAR25 was 48%.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133627331","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
A New High Gain Antenna Based on MIM Composite Extraordinary Optical Transmission Structure 基于MIM复合超常规光传输结构的新型高增益天线
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597819
Xuhui Zhang, Minquan Li, Xu Pan
{"title":"A New High Gain Antenna Based on MIM Composite Extraordinary Optical Transmission Structure","authors":"Xuhui Zhang, Minquan Li, Xu Pan","doi":"10.23919/PIERS.2018.8597819","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597819","url":null,"abstract":"This article is based on the related theory of extraordinary optical transmission (EOT), which is composed by a metal-insulator-metal (MIM) by the process of opening an array of holes and embedding split ring resonators (SRR) structure. For the purpose of bringing the MIM composite EOT structure into the complex layer structure of microstrip antenna, we propose a novel high gain microstrip antenna. Using the HFSS simulation software to simulate and analyze the abnormal transmission characteristics of the structure, we found that added the MIM composite EOT structure on the antenna has made its gain raised by 4.6 dB when compared with the original microstrip antenna. What's more, $E$-plane and $H$-plane were reduced by half-power beam width of 24 degrees and 92 degrees respectively. According to the designed ideas to introduce a physical test, the results of physical testing are in good agreement with the simulation results. This designed method has provided us a new train of thought to study the novel high gain antenna. Besides, it has also high research value.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133457425","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
A C-band Geophysical Model Function for Determining Coastal Wind Speed Using Synthetic Aperture Radar 利用合成孔径雷达确定海岸风速的c波段地球物理模型函数
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598163
Yiru Lu, Biao Zhang, W. Perrie, A. Mouche, Xiaofeng Li, He Wang
{"title":"A C-band Geophysical Model Function for Determining Coastal Wind Speed Using Synthetic Aperture Radar","authors":"Yiru Lu, Biao Zhang, W. Perrie, A. Mouche, Xiaofeng Li, He Wang","doi":"10.23919/PIERS.2018.8598163","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598163","url":null,"abstract":"A new geophysical model function (GMF), called C_SARMOD2, has been developed to determine coastal wind speed. A total of 3078 RADARSAT-2 and Sentinel-1A VV-polarized SAR images were collocated with in situ buoy measurements, which was used to derive transfer functions and then to validate the wind speed retrievals. The wind speeds retrieved by the proposed C_SARMOD2 model are more similar to buoy measurements with almost no bias and a root mean square error of 1.84 m/s. Two representative quad-and dual-polarization SAR images acquired from coastal regions are used as case studies to examine C_SARMOD2 performances. The case study and statistical validation results suggest that the proposed C_SARMOD2 has the potential to measure coastal wind speeds at sub-kilometer resolutions and also advocate for the necessity of revisiting the methodologies for ocean surface wind speed measurements in coastal areas.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133470562","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: 6
The Laser Scattering and Statistical Characteristics of Haze Particles Which Have Rarefied Random Distribution 具有稀薄随机分布的雾霾粒子的激光散射和统计特性
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597996
Ming-jun Wang, Ji-hua Yu, X. Ke, Ting Wu
{"title":"The Laser Scattering and Statistical Characteristics of Haze Particles Which Have Rarefied Random Distribution","authors":"Ming-jun Wang, Ji-hua Yu, X. Ke, Ting Wu","doi":"10.23919/PIERS.2018.8597996","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597996","url":null,"abstract":"Haze phenomenon frequently occurs in recent years. Therefore, the development light scattering characteristics of haze particles has great significance for haze particle size and composition analysis, as well as the impact of wireless optical communications. Combining Mie theory and Rayleigh scattering, the differential scattering section (DSS) of single haze particle and the statistical average DSS of ellipsoid particles with different aspect ratios which have lognormal distribution are analyzed and calculated at the laser wavelength of $1.06 mu text{m}$ in this paper. Our works will further study to carry out laser scattering characteristics of thin random distributed and complex shaped haze particles and provide the basic theoretical basis for the study of the influence of real haze environment on wireless laser communication.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115207886","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
Analysis of SiGe Heterojunction Tunneling Field-Effect Transistor in the Microwave Regime Through Its Small-Signal Equivalent Circuit 微波环境下SiGe异质结隧道场效应晶体管的小信号等效电路分析
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598056
Y. Jung, I. Kang, Seongjae Cho
{"title":"Analysis of SiGe Heterojunction Tunneling Field-Effect Transistor in the Microwave Regime Through Its Small-Signal Equivalent Circuit","authors":"Y. Jung, I. Kang, Seongjae Cho","doi":"10.23919/PIERS.2018.8598056","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598056","url":null,"abstract":"In this study, Si1-xGex is used as the source junction material in a tunneling field-effect transistor (TFET)and the device is analyzed in the perspectives of radio-frequency (RF)performances. Using the small-signal equivalent circuit with high accuracy in the RF domain, the errors in capacitances and transconductances have been effectively suppressed below 11 % at 600 GHz.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115241664","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
Terahertz-Wave Communication System Using a Traveling-Wave Tube Amplifier 使用行波管放大器的太赫兹波通信系统
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597955
A. Kanno, N. Sekine, A. Kasamatsu, N. Yamamoto, Mitsuru Yoshida, N. Masuda
{"title":"Terahertz-Wave Communication System Using a Traveling-Wave Tube Amplifier","authors":"A. Kanno, N. Sekine, A. Kasamatsu, N. Yamamoto, Mitsuru Yoshida, N. Masuda","doi":"10.23919/PIERS.2018.8597955","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597955","url":null,"abstract":"We propose a THz communication system using the combination of high-gain antennas and an amplifier chain. A Cassegrain antenna used as a high-gain antenna enhances a link gain with an antenna gain of 40 dBi or more. Finally, an effective isotropic radiated power is achieved more than 40 dBm. The proof-of-concept demonstration is performed for the realization of THz point-to-point communication systems with moderate spectral efficiency.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115543045","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: 2
Design of a Ring Oscillator with Temperature and Process Compensation Adopting a Novel Method 采用新方法设计具有温度和过程补偿的环形振荡器
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598161
Jian-Chang Du, Zhigong Wang, Xi Chen, Jian Xu, Bing-Bing Ma
{"title":"Design of a Ring Oscillator with Temperature and Process Compensation Adopting a Novel Method","authors":"Jian-Chang Du, Zhigong Wang, Xi Chen, Jian Xu, Bing-Bing Ma","doi":"10.23919/PIERS.2018.8598161","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598161","url":null,"abstract":"Due to the variation of temperature and process corner, a ring oscillator implemented in a CMOS process will not have a constant output frequency. In order to get a relatively constant frequency, an additional circuit is needed to compensate the variation in both temperature and process corner. Based on the traditional method of ring-oscillation linear compensation, a new type of compensation coefficient least-squares algorithm is presented in this paper. This method is used to approximate the optimal solution of the system of equations, and the best possible compensation control voltage group is obtained. The proposed oscillator has a center frequency of 9.844 MHz in the temperature range of −20°C to 80°C and at various process corners, with a maximum deviation of only 1.5% (pre-simulation) and 1.7% (post-simulation). The design was simulated and verified in SMIC 0.18-μm CMOS technology, uses a 2.5-V supply, and consumes a maximum power of 1 m W.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115577432","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
Meandered Inductor Shape of DGS for Coupling Suppression Between Adjacent Elements of Array Antenna 阵列天线相邻单元间耦合抑制的DGS弯曲电感形状
2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597776
M. Yunus, Prama Artha Nugraha, Waryari, H. Nusantara, A. Munir
{"title":"Meandered Inductor Shape of DGS for Coupling Suppression Between Adjacent Elements of Array Antenna","authors":"M. Yunus, Prama Artha Nugraha, Waryari, H. Nusantara, A. Munir","doi":"10.23919/PIERS.2018.8597776","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597776","url":null,"abstract":"Defected ground structure (DGS) has been recently applied to enhance the bandwidth and gain of microstrip antenna, as well as to effectively improve the radiation characteristics by suppressing the higher mode harmonics and coupling between adjacent elements of array antenna. This paper presents the use of DGS which takes meandered inductor (MI) shape to improve the return loss ($S_{11}$) and to suppress the coupling between adjacent elements ($S_{21}$) of array antenna. An FR4 epoxy dielectric substrate with the thickness of 1.6 mm is used for deploying the antenna. The MI shape slot is embedded on the groundplane at the bottom side of dielectric substrate between two elements of array antenna which are deployed on the top side. The simulated results show that values of $S_{11}$ and $S_{21}$ have been improved up to 4.4 dB and 1.9 dB, respectively, at the resonant frequency of 2 GHz. This is comparable with the measured results which have achievement up to 8 dB and 5 dB for $S_{11}$ and $S_{21}$, respectively.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124356997","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: 7
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