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2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)最新文献

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Sub-mm Resolution 3D SAR Imaging at 1.5 THz 1.5太赫兹下的亚毫米分辨率3D SAR成像
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486780
A. Batra, M. Wiemeler, D. Göhringer, T. Kaiser
{"title":"Sub-mm Resolution 3D SAR Imaging at 1.5 THz","authors":"A. Batra, M. Wiemeler, D. Göhringer, T. Kaiser","doi":"10.1109/IWMTS51331.2021.9486780","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486780","url":null,"abstract":"The frequency range of synthetic aperture radar is being extended to the promising THz spectrum as it provides high spatial resolution. The spectrum broadens the SAR applications to sub-mm resolution imaging and localization, non-destructive testing, and material characterization. Although the spectrum suffers from high atmospheric attenuation and free space path loss limiting the sensing range, it has emerging short-range applications. State-of-the-art THz SAR imaging is demonstrated primarily up to 1.1 THz with electronic transceiver modules. This paper presents one of the first demonstrations of 3D SAR imaging at 1.5 THz. The frequency band of 1.1-1.5 THz is considered for imaging a metallic target at a reference range of approx. 40 cm. The enhancement in terms of imaging quality compared to SAR image for the frequency band, 0.85-1.1 THz, is also presented.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126716673","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
Dynamic Array of Subarrays Architecture Based Hybrid Beamforming in UM-MIMO Systems 基于动态子阵列结构的UM-MIMO系统混合波束形成
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486830
A. Najjar, M. El-Absi, T. Kaiser
{"title":"Dynamic Array of Subarrays Architecture Based Hybrid Beamforming in UM-MIMO Systems","authors":"A. Najjar, M. El-Absi, T. Kaiser","doi":"10.1109/IWMTS51331.2021.9486830","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486830","url":null,"abstract":"The TeraHertz (THz) band ranging between 0.1 THz and 10 THz offers huge vacant bandwidths and consequently enormous link capacities. Still, the severe path loss imposed at THz frequencies makes the adoption of beamforming techniques imperative for optimal exploitation of this frequency range. In this paper, aiming at taking full advantage of the available bandwidths in this frequency range, we propose a hybrid beamforming algorithm adopting dynamic array of subarrays architecture in a point-to-point Ultra Massive Multiple Input Multiple Output (UM-MIMO) system. Firstly, we evaluate the unique trade-off between the spectral efficiency and the hardware complexity of the system, that the proposed algorithm enjoys. Finally, we merge the proposed beamforming algorithm with the IEEE 802.15.3d standard and evaluate the performance of a point-to-point link using the proposed algorithm.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129086677","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
Performance Comparison of Digital Modulations in the Presence of Gaussian Phase Noise in the Sub-THz Context 亚太赫兹环境下存在高斯相位噪声的数字调制性能比较
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486786
Paul Desombre, Haifa Fares, Y. Louët
{"title":"Performance Comparison of Digital Modulations in the Presence of Gaussian Phase Noise in the Sub-THz Context","authors":"Paul Desombre, Haifa Fares, Y. Louët","doi":"10.1109/IWMTS51331.2021.9486786","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486786","url":null,"abstract":"Driven by the need of more available frequency bands, an increasing attention has been paid to the use of sub-THz bands. In such high frequency bands, the signal is expected to be impaired by phase noise, I/Q mismatch, power amplifier non linearities, etc. It has been shown that at such frequencies, with possibly large bandwidth (∼ 50 GHz), Gaussian phase noise models accurately the phase noise. This paper studies the effect of Gaussian phase noise on several waveforms. Here, five performance metrics are used to compare them: Bit Error Rate (BER), Peak-to-Average Power Ratio (PAPR), Adjacent Channel Power Ratio (ACPR), spectral efficiency (SE) and Error Vector Magnitude (EVM). The aim of this comparison is to give recommandations on which waveform to use in this context, depending on the impact of the phase noise on the performance of such transmissions.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114362341","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
Interpolation Methods for SAR Backprojection at THz Frequencies 太赫兹波段SAR反投影插值方法
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486824
Y. Ivanenko, V. Vu, M. Pettersson
{"title":"Interpolation Methods for SAR Backprojection at THz Frequencies","authors":"Y. Ivanenko, V. Vu, M. Pettersson","doi":"10.1109/IWMTS51331.2021.9486824","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486824","url":null,"abstract":"The paper proposes the extensions of the available linear and cubic interpolation methods for backprojecting complex SAR data into an image plane. Due to the fact that the phase of complex SAR data is very sensitive to the shift in time, the proposed interpolations include the phase control of the interpolated complex values. The proposed methods are examined with the global backprojection algorithm that is used to process SAR data at THz frequencies. In numerical examples, a two-dimensional indoor THz SAR imaging for a point target is considered, where the developed interpolation methods are compared with the nearest neighbor approach.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114769397","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 and Fabrication of MEMS Reflectors for THz Reflect-Arrays 太赫兹反射阵列MEMS反射器的设计与制造
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486804
Lisa Schmitt, Xuan-He Liu, A. Czylwik, M. Hoffmann
{"title":"Design and Fabrication of MEMS Reflectors for THz Reflect-Arrays","authors":"Lisa Schmitt, Xuan-He Liu, A. Czylwik, M. Hoffmann","doi":"10.1109/IWMTS51331.2021.9486804","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486804","url":null,"abstract":"We present the design and fabrication of MEMS reflectors intended to be part of a mechanical terahertz (THz) beam steering reflect-array. Each reflector is shifted by a bidirectional stepwise electrostatic actuator system. The design and functionality of actuator system and reflect-array limit and determine the reflector design. In this paper, we adapt a dicing-free Silicon-on-Insulator (SOI) fabrication process to the requirements of a THz MEMS reflector. We present the partial release of the handle layer from the SOI substrate on wafer level, leaving the remaining connected part as a functional system component. To realize an open interface for the interaction of the reflector with the THz beam, the device layer and the handle layer frame surrounding the SOI chip are partially released during hydrofluoric (HF) vapor etching making a mechanical destruction of the surrounding frame obsolete.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132451507","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
Frequency-Coded Lens by Photonic Crystal Resonator for mm-Wave Chipless RFID Applications 毫米波无芯片射频识别中光子晶体谐振器的频率编码透镜
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486828
A. A. Abbas, Yamen Zantah, K. Solbach, T. Kaiser
{"title":"Frequency-Coded Lens by Photonic Crystal Resonator for mm-Wave Chipless RFID Applications","authors":"A. A. Abbas, Yamen Zantah, K. Solbach, T. Kaiser","doi":"10.1109/IWMTS51331.2021.9486828","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486828","url":null,"abstract":"One-dimensional Photonic Crystal (1D PhC) resonator is recently introduced as a good nominee to replace conventional tags at mm-wave and THz bands. For a use of such tags as landmarks in mm-wave indoor self-localization systems, an augmentation of their RCS is required to improve the reading range. As a solution, we propose the integration of a 1D PhC resonator with a dielectric lens (i.e. frequency coded lenses). This concept is demonstrated by locating a 1D PhC resonator in the focal area of a spherical dielectric lens made of PolyPropylene (PP) material with a relative permittivity of 2.0. On the other hand, the PhC resonator is designed by introducing a defect layer between two quarter-wave Bragg mirrors in order to produce a notch signature in the backscattering. Two frequency coded lenses of 24 mm and 40 mm diameter are simulated, fabricated, and experimentally examined. Results show that these coded lenses can achieve 9 dB and 14 dB improvement in RCS, respectively.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123832815","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
Terahertz Three-Dimensional SAR Imaging Using Time- and Frequency-Domain Algorithms 使用时域和频域算法的太赫兹三维SAR成像
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486769
V. Vu, M. Pettersson
{"title":"Terahertz Three-Dimensional SAR Imaging Using Time- and Frequency-Domain Algorithms","authors":"V. Vu, M. Pettersson","doi":"10.1109/IWMTS51331.2021.9486769","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486769","url":null,"abstract":"Terahertz (THz) SAR opens opportunity for some new applications, e.g., sub-mm localization based on 3D SAR imaging, that cannot be based on the conventional SAR operating at frequency ranges below THz. For 3D THz SAR imaging, the image formation algorithms play an important role. Two 3D SAR image formation algorithms, Range Migration (RM) operating in frequency domain and Backprojection (BP) operating in time domain are considered in this comparative study. The algorithms are first used to form 3D images from simulated THz SAR data. The comparison is then based on image quality measurements such as range and cross-range resolutions, and peak sidelobe ratio (PSLR).","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122241000","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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