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

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Frequency-Coded Spherical Retroreflector for Wide-Angle Indoor Localization Tag Landmarks 频率编码球面后向反射器用于广角室内定位标签地标
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486810
Jesús Sánchez-Pastor, A. Jiménez-Sáez, M. Schüßler, R. Jakoby
{"title":"Frequency-Coded Spherical Retroreflector for Wide-Angle Indoor Localization Tag Landmarks","authors":"Jesús Sánchez-Pastor, A. Jiménez-Sáez, M. Schüßler, R. Jakoby","doi":"10.1109/IWMTS51331.2021.9486810","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486810","url":null,"abstract":"This paper studies the suitability of frequency-coded spherical retroreflectors as passive tag landmarks in a mmwave indoor self-localization system. By designing a spherical tag as a combination of two simple structures, spherical retroreflectors with frequency selective surfaces, wide readout angles are expected, while keeping manufacturing complexity low. The fabricated tag presents successful frequency coding at 82 GHz in an angular range of 120°, with a measured average radar-cross section of −15 dBsqm in that range. Moreover, the tag works for both transverse electric and transverse magnetic plane waves and has an operating bandwidth of 6.1%, allowing for the encoding of 9 notches, or 3.17 bits, in W-band.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"315 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":"131261179","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
FPGA-Based Acceleration of THz SAR Imaging 基于fpga的太赫兹SAR成像加速
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486819
A. Batra, Ahmed Kamaleldin, L. Zhen, M. Wiemeler, D. Göhringer, T. Kaiser
{"title":"FPGA-Based Acceleration of THz SAR Imaging","authors":"A. Batra, Ahmed Kamaleldin, L. Zhen, M. Wiemeler, D. Göhringer, T. Kaiser","doi":"10.1109/IWMTS51331.2021.9486819","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486819","url":null,"abstract":"Terahertz (THz) Synthetic Aperture Radar (SAR) is an emerging domain as it provides high spatial resolution in the range of sub-mm compared to the conventional lower frequency spectrum SAR. Despite the limited propagation range at the THz spectrum, it is suitable for short-range applications. One primary potential application could be unmanned aerial vehicle (UAV) based THz SAR for environment mapping and profiling. To address real-time mapping/profiling, a Field-Programmable Gate Array (FPGA) based signal processing platform seems to be promising. Firstly, due to energy efficiency in comparison to CPU and GPU. Secondly, it provides massive parallelism data processing. Therefore, in this paper, a hardware-accelerated 2D THz SAR imaging is presented. The time-domain image reconstruction algorithm Backprojection is implemented using hardware description language (HDL) for the FPGA platform and in consideration of measured data for the 220-330 GHz spectrum. Further, the paper presents the estimation of accuracy in comparison to CPU-based results and hardware resource utilization. Besides, the analysis on execution time and speed-up is provided. The proposed SAR imaging accelerator is implemented and evaluated on Xilinx Zynq Ultrascale+ ZCU102 FPGA board.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"28 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":"115080143","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
Unexplored Aspects in THz Ray-Tracing 太赫兹射线追踪中未探索的方面
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486785
F. Sheikh, Bahaa E. A. Salah, D. Lessy, T. Kaiser
{"title":"Unexplored Aspects in THz Ray-Tracing","authors":"F. Sheikh, Bahaa E. A. Salah, D. Lessy, T. Kaiser","doi":"10.1109/IWMTS51331.2021.9486785","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486785","url":null,"abstract":"Presented in this paper are unexplored aspects of terahertz (THz) ray-tracing from antennas to propagation domains. Firstly, we come forth with a realistic angle spacing (or interval) for exporting composite 3D beam antenna patterns into shooting bouncing ray-tracing (SBR) method also verified by measurement data at 300 GHz carrier frequency. Further, the simulation results obtained for random and non-random rough surfaces at the frequency of interest in a realistic simple office environment encompassing both line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios are compared to highlight the unexpected disparity observed in multipath dynamics and received signal strength. The real 3D surface topography parameters are inculcated for the random whilst the non-random rough surface adopts Rayleigh-Rice (R-R) and Beckmann-Kirchhoff (B-K) modeling approaches. Next, the issue of XY-grid spacing at 300 GHz is addressed to acquire a thorough understanding of in-room wave propagation which poses unique challenges for channel modeling.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"34 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":"123346717","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
Design of a 1-to-4 Subarray Element for Wireless Subharmonic Injection in the THz Band 一种用于太赫兹波段无线次谐波注入的1对4子阵列元件的设计
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486781
Meng Zhang, Peng-Yuan Wang, A. Rennings, S. Clochiatti, W. Prost, N. Weimann, D. Erni
{"title":"Design of a 1-to-4 Subarray Element for Wireless Subharmonic Injection in the THz Band","authors":"Meng Zhang, Peng-Yuan Wang, A. Rennings, S. Clochiatti, W. Prost, N. Weimann, D. Erni","doi":"10.1109/IWMTS51331.2021.9486781","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486781","url":null,"abstract":"This paper presents an on-chip 1 to 4 subarray element for wireless subharmonic injection (WSI) in the context of antenna-in-antenna THz oscillators. The proposed antenna receives the third-order subharmonic injection signal (SIS) at 100 GHz from one side and radiates the 300 GHz fundamental oscillation signal (FOS) to the opposite side, which performs like a subharmonic transmitarray. Each element is consisted of a single SIS receiving antenna (Receiver antenna, RA) connected with a $2times 2$ FOS array (Transmitter antenna, TA). By positioning more FOS antenna around the single SIS antenna, the element spacing at 300 GHz is shorted within one wavelength which inhibits the grating lobe. Through tuning the distance of the FOS array element, the surface wave in the thick indium phosphide (InP) substrate is also reduced to some degree. The simulation results show that the maximum radiation efficiency of the designed chip antenna structure is better than 50% in both the 100 GHz and the 300 GHz band. The conjugate impedance matching in the dual-band is achieved according to the active element requirement. Utilizing the antenna proposed in this work, a low injection loss is verified in the periodical boundary based WSI simulation.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"86 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":"123584455","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
Microwave Intermediate Frequency Equivalent Circuit of GaAs High Electron Mobility Field Effect Transistor Terahertz Detectors GaAs高电子迁移率场效应晶体管太赫兹探测器微波中频等效电路
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486796
Rahul Yadav, S. Regensburger, A. Penirschke, S. Preu
{"title":"Microwave Intermediate Frequency Equivalent Circuit of GaAs High Electron Mobility Field Effect Transistor Terahertz Detectors","authors":"Rahul Yadav, S. Regensburger, A. Penirschke, S. Preu","doi":"10.1109/IWMTS51331.2021.9486796","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486796","url":null,"abstract":"Field effect transistor (FET) based terahertz rectifiers are promising candidates for sensitive, room-temperature operated high speed (THz) detectors, e.g. in communication, medical, biochemical, security, quality control applications, or beam diagnostic applications at particle accelerators. This paper investigates the equivalent circuit in the intermediate frequency band from 0.1 to 65 GHz with S-parameter measurements in order to enable implementation with high speed post detection electronics. Preliminary results are obtained by de-embedding On-Wafer measurements and compared with theoretical expectations from hall measurements and a simplified equivalent circuit. The knowledge of the channel behavior and impedance is mandatory for impedance matching to IF circuitry in advanced detector designs.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"34 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":"125706094","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
Efficient Frequency Domain Sampling Schemes for THz SAR Systems 太赫兹SAR系统的有效频域采样方案
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486808
Jonas Schorlemer, K. Kolpatzeck, J. Balzer, A. Czylwik, I. Rolfes, J. Barowski
{"title":"Efficient Frequency Domain Sampling Schemes for THz SAR Systems","authors":"Jonas Schorlemer, K. Kolpatzeck, J. Balzer, A. Czylwik, I. Rolfes, J. Barowski","doi":"10.1109/IWMTS51331.2021.9486808","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486808","url":null,"abstract":"This paper addresses efficient frequency domain sampling techniques for faster Terahertz (THz) synthetic aperture radar (SAR) imaging. While the large available absolute bandwidths in the frequency range beyond 100 GHz enable very high resolution imaging techniques, sampling times e.g. in stepped continuous wave systems increase due to the large number of samples. Of course, fast scanning can be achieved by larger frequency steps but this comes at the cost of a smaller unambiguous range accessible to the measurement system. Especially in case of complex targets that are to be imaged, this can be a challenge. We propose, compare and discuss different sampling schemes in the frequency domain with non-equidistant frequency steps. The discussion is validated by measurements using a vector network analyzer (VNA) SAR imaging setup operating between 260 GHz and 400 GHz.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"12 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":"129918588","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
Low-Complexity Zero-Forcing Equalization for MIMO SC-FDMA Terahertz Communications MIMO SC-FDMA太赫兹通信的低复杂度零强制均衡
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486747
Mohamed Shehata, Ke Wang, W. Withayachumnankul
{"title":"Low-Complexity Zero-Forcing Equalization for MIMO SC-FDMA Terahertz Communications","authors":"Mohamed Shehata, Ke Wang, W. Withayachumnankul","doi":"10.1109/IWMTS51331.2021.9486747","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486747","url":null,"abstract":"Multiple input-multiple output (MIMO) transmission diversity has proven to be a spectrally-efficient technique that multiplies the capacities of band-limited wireless channels. However, employing this technique to the inherently bandwidth-generous terahertz technologies results in massive data volumes, which calls for computationally-affordable signal processing techniques. In this paper, we propose an implementation for zero-forcing (ZF) equalizers in single-carrier frequency domain multiple access (SC-FDMA) MIMO systems operating at terahertz frequencies, where the high-speed processing of massive data is of paramount importance. The proposed method explores the sparseness of the MIMO channel matrix to reduce the computational complexity. Simulation results show that the proposed equalizer is comparable to the conventional ZF equalizer in terms of the bit error rate (BER), with a much lower computational complexity. The proposed equalization approach can be considered as a potentially significant step towards the implementation of real-time terahertz communications applications.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"71 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120970629","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
THz Detectors and Emitters with On-Chip Antenna aligned on Hyper-Hemispherical Silicon Lenses 片上天线对准超半球面硅透镜的太赫兹探测器和发射器
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486802
R. Kress, C. Preuss, E. Mutlu, S. Clochiatti, W. Prost, N. Weimann
{"title":"THz Detectors and Emitters with On-Chip Antenna aligned on Hyper-Hemispherical Silicon Lenses","authors":"R. Kress, C. Preuss, E. Mutlu, S. Clochiatti, W. Prost, N. Weimann","doi":"10.1109/IWMTS51331.2021.9486802","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486802","url":null,"abstract":"On-chip antennas with radiation towards the substrate are affected by modest coupling performance to a free-space path. (Hyper-)hemispherical silicon lenses can improve the efficiency of quasi-optical emission and detection even at THz frequencies. This approach requires an alignment accuracy in the $mumathrm{m}$-scale at THz frequencies. In this contribution, we report on the benefit of hyper-hemispherical silicon lenses in terms of relaxed alignment accuracy needs. We present the impact of alignment on quasi-optical measurements using indium phosphide resonant-tunneling diodes. The main components of the resulting setups are discussed while the effect of alignment is quantitatively evaluated for both, hemispherical and hyper-hemispherical silicon lenses. Moreover, design rules and concepts for a heterointegrated system are derived on consecutive observations.","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":"114065229","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
Broadband THz Detection Using InP Triple-Barrier Resonant Tunneling Diode With Integrated Antenna 带集成天线的InP三势垒谐振隧道二极管宽带太赫兹探测
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486794
S. Clochiatti, E. Mutlu, C. Preuss, R. Kress, W. Prost, N. Weimann
{"title":"Broadband THz Detection Using InP Triple-Barrier Resonant Tunneling Diode With Integrated Antenna","authors":"S. Clochiatti, E. Mutlu, C. Preuss, R. Kress, W. Prost, N. Weimann","doi":"10.1109/IWMTS51331.2021.9486794","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486794","url":null,"abstract":"A broadband THz detector consisting of a triple-barrier InP Resonant Tunneling Diode (RTD) with a monolithically integrated circularly polarized spiral antenna is designed, fabricated, and measured at room temperature. A free space measurement setup is utilized for far-field characterization. The detector (evaluated at zero-bias) is illuminated by a chopped continuous wave signal in the 220–330 GHz band, and the direct detection scheme consists of a lock-in amplifier in voltage mode readout. The measured average responsivity RV is in the range of 750 V/W with a peak of 900 V/W at 257.5 GHz, with the lowest calculated NEP of 2.5 pW/√Hz.","PeriodicalId":429985,"journal":{"name":"2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"146 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":"116486994","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
Theoretical Study of a 1.94 THz RTD-gHEMT Oscillator Towards THz Communications 1.94太赫兹RTD-gHEMT振荡器对太赫兹通信的理论研究
2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2021-07-05 DOI: 10.1109/IWMTS51331.2021.9486829
Rafael Nóbrega, T. Raddo, Ulysses R. Duarte, A. Sanches, M. Loiola
{"title":"Theoretical Study of a 1.94 THz RTD-gHEMT Oscillator Towards THz Communications","authors":"Rafael Nóbrega, T. Raddo, Ulysses R. Duarte, A. Sanches, M. Loiola","doi":"10.1109/IWMTS51331.2021.9486829","DOIUrl":"https://doi.org/10.1109/IWMTS51331.2021.9486829","url":null,"abstract":"Suitable power levels remain constant challenges in terahertz (THz) communications. This work analytically investigates a 1.94 THz resonant tunneling diode-gated high-electron mobility transistor (RTD-gHEMT)-based oscillator along with a graphene antenna for future 6G wireless networks. We obtain the negative conductance of a distributed circuit model from experimental results of an InGaAs/AlAs RTD oscillator. Analytical results show the device notably achieves an output power up to 14 mW (∼11.5 dBm) whilst operating at frequencies as high as 1.94 THz. Furthermore, the RTD-gHEMT device has a 37.4 nm gate length, which renders a substantial decrease in the system form factor. These unique features place the device as part of potential solutions for generation and transmission of THz signals in 6G networks.","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":"121407168","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
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