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2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)最新文献

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Wideband Characterization of 3D Printed THz Rectangular Dielectric Waveguides by THz Frequency-Domain Spectroscopy 3D打印太赫兹矩形介质波导的太赫兹频域光谱宽带表征
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823720
X. Liu, K. Kolpatzeck, A. Öztürk, B. Friederich, D. Damyanov, L. Häring, T. Schultze, J. Balzer, A. Czylwik
{"title":"Wideband Characterization of 3D Printed THz Rectangular Dielectric Waveguides by THz Frequency-Domain Spectroscopy","authors":"X. Liu, K. Kolpatzeck, A. Öztürk, B. Friederich, D. Damyanov, L. Häring, T. Schultze, J. Balzer, A. Czylwik","doi":"10.1109/IWMTS.2019.8823720","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823720","url":null,"abstract":"In this paper single-mode dielectric waveguides for 140 GHz are designed and fabricated by 3D printing technology. The waveguides are simulated using the finite difference time domain method and characterized by determining their frequencydependent attenuation constant and frequency-dependent effective refractive index from 100 GHz to 180 GHz using THz frequency-domain spectroscopy. Furthermore, the mode patterns at different frequencies are observed by performing transversal scans of the far-field radiation pattern at the output of the waveguide.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122655632","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
Monitoring the Variability of Water Dynamics in Plant Leaves at Cellular Level Using Terahertz Sensing 利用太赫兹传感技术在细胞水平上监测植物叶片水分动力学的变化
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823719
A. Zahid, H. Abbas, H. Heidari, M. Imran, A. Alomainy, Q. Abbasi
{"title":"Monitoring the Variability of Water Dynamics in Plant Leaves at Cellular Level Using Terahertz Sensing","authors":"A. Zahid, H. Abbas, H. Heidari, M. Imran, A. Alomainy, Q. Abbasi","doi":"10.1109/IWMTS.2019.8823719","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823719","url":null,"abstract":"The growing aridification has posed huge challenges in the agriculture sector, and effective use of water resourcesisvital to timely growth of plantsleaves to maintain healthy physiology, and for precision agriculture applications. This paper presents a nowl and simple THz sensing technique to monitor the water content (WC) of three fresh leaves for continuously four days in the frequency range of 0.75 to 1.1 THz by determining the electromagnetic parameter. The weights of all three leaves were also measured for consecutiw four days. By observing absorption coefficient, an upward trend was noticed with increasing frequency from day 1 to 4. However, absorption coefficient was found to be high on day 1 due to the presence of high WC in leaves and as days passed, the loss was evidently reduced due to the evaporation of WCinleaves. Upon close analysis, the results demonstrated a strong correlation of absorption coeffi cient with WC of leaves.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134572173","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
Wave Scattering from Non-Gaussian Rough Surfaces at Terahertz Frequencies 太赫兹下非高斯粗糙表面的波散射
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823778
Mai Alissa, F. Sheikh, A. A. Abbas, T. Kaiser
{"title":"Wave Scattering from Non-Gaussian Rough Surfaces at Terahertz Frequencies","authors":"Mai Alissa, F. Sheikh, A. A. Abbas, T. Kaiser","doi":"10.1109/IWMTS.2019.8823778","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823778","url":null,"abstract":"Concerning the facile solution to the problem of electromagnetic waves’ scattering by a random rough surface, the surface distribution is generally assumed to be Gaussian. In this work, the scattering by non-Gaussian rough surfaces is investigated analytically and by simulation at terahertz (THz) frequencies. We found that for a slightly rough surface, a change in the distribution plays no major role in the scattering behavior at frequency of interest. However, for a very rough surface, with standard height deviations in the order of wavelength, the scattering pattern was distinctly affected thus changing the distribution when all other scattering factors are constant. The simulation results agree well with the analytical model, and prove that a normally distributed surface model may exhibit as an overly general surface to all random rough surfaces at THz frequencies.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128073209","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
SAR Signal Processing Architecture and Effects of Motion Errors for mmWave and THz Frequencies 毫米波和太赫兹频率SAR信号处理体系及运动误差的影响
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823730
A. Batra, M. Wiemeler, T. Kreul, D. Goehringer, T. Kaiser
{"title":"SAR Signal Processing Architecture and Effects of Motion Errors for mmWave and THz Frequencies","authors":"A. Batra, M. Wiemeler, T. Kreul, D. Goehringer, T. Kaiser","doi":"10.1109/IWMTS.2019.8823730","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823730","url":null,"abstract":"Most commonly used frequencies in Synthetic Aperture Radar (SAR) imaging are from hundreds of MHz to tens of GHz. Nowadays, the unexplored mmWave and THz regimes are being investigated for SAR imaging to have higher resolution. Two research challenges for this technology motion compensation and real-time processing are addressed in this paper. SAR image reconstruction algorithms lack data dependencies. Therefore, it can be processed in a parallel computing environment to accelerate the image reconstruction. This paper presents the theoretical model of a distributed signal processing testbed. The performance enhancement with the inclusion of high performance computing for image processing is also explained. Another challenge for this technology comes from a motion compensation point of view. The SAR signal processing assumption is that the radar-carrying platform follows an ideal path. However, in reality, the platform deviates from this path. Especially at THz, very small deviations in the range of sub-mm produce motion errors because of wavelengths in the range of deviations. It degrades the image quality and provides wrong estimations of range and azimuth scatters. The paper summarizes motion error types, their characterization, and constraint on the amplitude of deviation. Also, the paper presents effects of these errors at 100 GHz with simulation results.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134542715","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
Terahertz Sensing for Fruit Spoilage Monitoring 太赫兹传感用于水果变质监测
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823735
A. Ren, A. Zahid, M. Imran, A. Alomainy, Dou Fan, Q. Abbasi
{"title":"Terahertz Sensing for Fruit Spoilage Monitoring","authors":"A. Ren, A. Zahid, M. Imran, A. Alomainy, Dou Fan, Q. Abbasi","doi":"10.1109/IWMTS.2019.8823735","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823735","url":null,"abstract":"A novel method was presented in this paper to obtain the absorption coefficient of pear and apple slices based on the scattering parameters, which were measured by employing Vector Network Analyzer (VNA) extended into the Terahertz (THz) frequency range of 0.75 THz to 1.1 THz with Swissto 12 waveguide systems. The results show the significant difference of absorption coefficient and transmission response between pear and apple slices when the Moisture Content (MC) value is less than 50% with the passing days. The comparison results display that the decreasing ratio of the absorption with the MC in apple slice is nearly three times faster than that in pear slice due to the different characteristics of the internal constituents and texture structures in the THz region. The application presented in this paper can be applied to detect the chemical characteristics and the signatures of inner compositions for quality control in fruits.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114407883","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: 9
2D Metamaterial Luneburg Lens for Enhancing the RCS of Chipless Dielectric Resonator Tags 用于增强无芯片介质谐振器标签RCS的二维超材料Luneburg透镜
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823784
Y. Zhao, J. Weidenmueller, G. V. Bögel, A. Grabmaier, A. A. Abbas, K. Solbach, Alejandro Jiménez-Sáez, M. Schüßler, R. Jakoby
{"title":"2D Metamaterial Luneburg Lens for Enhancing the RCS of Chipless Dielectric Resonator Tags","authors":"Y. Zhao, J. Weidenmueller, G. V. Bögel, A. Grabmaier, A. A. Abbas, K. Solbach, Alejandro Jiménez-Sáez, M. Schüßler, R. Jakoby","doi":"10.1109/IWMTS.2019.8823784","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823784","url":null,"abstract":"In this paper, a 2D Luneburg lens is proposed to improve the Radar Cross Section (RCS) of dielectric resonator (DR) tags, which would be used for an indoor localization system at THz frequencies where the low RCS of the tag makes the detection against clutter signals difficult. A Luneburg lens made of PTFE is fabricated using milling technique based on metamaterial concept, and characterized using a Vector Network Analyzer (VNA). Three ceramic resonators with different resonance frequencies are placed at different positions in the lens focal area to test the performance of the lens. To prove the concept, the simulation and measurement have been performed at scaled frequencies in the 4.5-7 GHz range. The RCS improvement is found to depend on the lens dimensions and frequencies of operation. A Luneburg lens with a height of 35 mm and a diameter of 66 mm boosts the RCS by 18 dB at 6.2 GHz.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116016658","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: 5
Antenna design for subharmonic injection-locked triple barrier RTD oscillator in the 300 GHz band 300 GHz频段亚谐波注入锁态三势垒RTD振荡器天线设计
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823656
Meng Zhang, S. Clochiatti, A. Rennings, K. Arzi, W. Prost, N. Weimann, D. Erni
{"title":"Antenna design for subharmonic injection-locked triple barrier RTD oscillator in the 300 GHz band","authors":"Meng Zhang, S. Clochiatti, A. Rennings, K. Arzi, W. Prost, N. Weimann, D. Erni","doi":"10.1109/IWMTS.2019.8823656","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823656","url":null,"abstract":"This paper presents a dielectric lens antenna (DLA) for a wireless subharmonic injection-locked triple barrier (TB) resonant tunneling diode (RTD) oscillator. The proposed DLA receives power from a reference source in the 100 GHz band and radiates at 300 GHz corresponding to the fundamental frequency of the TB RTD. An extended hemispherical alumina lens is utilized to enhance the gain of the antenna while inhibiting the emergence of surface waves in the underlying indium phosphide (InP) substrate. The feed of the DLA consists of a fat monopole with a slot-like counterpoise yielding a bandwidth that can cover both, the 100 GHz subharmonic frequency band and the 300 GHz. In order to maximize the injection power, a near-field coupling topology as well as a dual-band complex impedance matching network are applied. The coupling part, which is placed in the near field of the antenna, has minimal impact on the antenna’s far field radiation pattern and shows a good coupling efficiency in the meantime.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132891250","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
A Compact THz Quasi TDS System for Mobile Scenarios 面向移动场景的紧凑太赫兹准TDS系统
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823786
S. Tonder, K. Kolpatzeck, Xuan-He Liu, Sebastian Rumpza, A. Czylwik, J. Balzer
{"title":"A Compact THz Quasi TDS System for Mobile Scenarios","authors":"S. Tonder, K. Kolpatzeck, Xuan-He Liu, Sebastian Rumpza, A. Czylwik, J. Balzer","doi":"10.1109/IWMTS.2019.8823786","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823786","url":null,"abstract":"In this paper, a compact and affordable approach for terahertz spectroscopy is proposed. A quasi time-domain spectroscope, based on a multimode laser diode, is combined with a data acquisition setup consisting of an Arduino microcontroller platform and a Raspberry Pi single-board computer. The measurement results are verified with common laboratory equipment. A bandwith of more than 1 THz was achieved.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114319079","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: 3
Electromagnetic Identification from UHF to THz: State of the Art, Novel Approaches and Outlook 从UHF到THz的电磁识别:技术现状、新方法与展望
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823715
M. Khaliel, T. Kaiser
{"title":"Electromagnetic Identification from UHF to THz: State of the Art, Novel Approaches and Outlook","authors":"M. Khaliel, T. Kaiser","doi":"10.1109/IWMTS.2019.8823715","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823715","url":null,"abstract":"This paper presents a brief review of the passive EM identification technologies up to THz frequency range. Special attention is devoted to THz identification, where a Dielectric Resonator (DR) is considered to be the most effective frequency encoding element up to date. In this paradigm, the recent advances in DR based identification are comprehensively reviewed. Furthermore, the DR resonance modes are for the first time separated and thus the corresponding RCS of each mode is accurately evaluated. However, the literature counterpart, the superposition of all modes is considered to be the DR RCS. After that, the clutter suppression is discussed in the context of a specific indoor localization scenario. Accordingly, the backscattering signal and system models for separating and detecting these modes are presented. Hence, these developed models are paving the way for developing a unifying evaluation framework which aspires to evaluate performance of the various tag design approaches in different real scenarios.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125112841","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
Mutually Coupled Dielectric Resonators for On-Chip Antenna Efficiency Enhancement 提高片上天线效率的互耦介质谐振器
2019 Second International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2019-07-01 DOI: 10.1109/IWMTS.2019.8823752
B. Sievert, J. Svejda, D. Erni, A. Rennings
{"title":"Mutually Coupled Dielectric Resonators for On-Chip Antenna Efficiency Enhancement","authors":"B. Sievert, J. Svejda, D. Erni, A. Rennings","doi":"10.1109/IWMTS.2019.8823752","DOIUrl":"https://doi.org/10.1109/IWMTS.2019.8823752","url":null,"abstract":"Dielectric Resonator Antennas (DRA) are designed for high efficiency operation utilizing the low dielectric losses of appropriately chosen materials. Although the mode and thus the resonance frequency is determined by the dielectric resonator, the (metal) structure used for excitation needs to fit the resonance frequency as well. This paper presents a novel method of using dielectric resonators as coupling elements into free space. The resonance frequency is determined by the exciting grounded $lambda$ -dipole, the dielectric resonators are driven approximately at eigenresonance. A close proximity of the dielectric resonators (DR) enforces a coupling which leads to fringing fields contributing to the radiation. Finally, an increased radiation efficiency is predicted for the on-chip enviroment at 220 GHz.","PeriodicalId":126644,"journal":{"name":"2019 Second International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125343137","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
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