2018 First International Workshop on Mobile Terahertz Systems (IWMTS)最新文献

System-Theoretical Modeling and Analysis of Phase Control in a Photonically Steered Terahertz Phased Array Transmitter 光导太赫兹相控阵发射机相位控制系统理论建模与分析

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-02 DOI: 10.1109/IWMTS.2018.8454691

K. Kolpatzeck, Xuan-He Liu, L. Häring, A. Czylwik

{"title":"System-Theoretical Modeling and Analysis of Phase Control in a Photonically Steered Terahertz Phased Array Transmitter","authors":"K. Kolpatzeck, Xuan-He Liu, L. Häring, A. Czylwik","doi":"10.1109/IWMTS.2018.8454691","DOIUrl":"https://doi.org/10.1109/IWMTS.2018.8454691","url":null,"abstract":"The use of photonic phase shift beamforming is highly attractive in terahertz transmitters due to its seamless integration with terahertz generation by photomixing. By feeding several photodiodes with coherent infrared signals with well-defined phase relationships, highly directed and steerable terahertz radiation can be generated. At the same time, the total radiated power is increased by free-space power combining. Since optical phase modulators are readily available in planar lightwave circuit technology and do not need to scale with RF frequency, planar optic integration is simplified compared to photonic true time delay beamforming. However, phase fluctuations due to thermal and mechanical influences become a major issue if fiber-optic components are used and necessitate the implementation of a phase control circuit. Since direct detection of the terahertz phases is not feasible, an alternative approach is needed. In this paper, a concept for controlling the terahertz phases using a lower-frequency reference tone generated by a second set of infrared lasers is proposed and a simplified system-theoretical model is developed and analyzed.","PeriodicalId":267901,"journal":{"name":"2018 First International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132573370","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

Study of 130 nm SiGe HBT Periphery in the Design of 160 GHz Power Amplifier 160ghz功率放大器设计中130nm SiGe HBT外围器件的研究

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454697

Abdul Ali, E. Cipriani, T. Johansen, P. Colantonio

引用次数: 8

Terahertz Time-Domain Spectroscopy by Asynchronous Sampling with Modelocked Semiconductor Lasers 锁模半导体激光器异步采样的太赫兹时域光谱学

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454698

N. Surkamp, B. Döpke, Y. Hu, C. Brenner, M. Hofmann, A. Klehr, A. Knigge, G. Tränkle

引用次数: 5

A Novel Ray-Tracing Algorithm for Non-Specular Diffuse Scattered Rays at Terahertz Frequencies 一种新的太赫兹非镜面漫射散射射线追踪算法

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454694

F. Sheikh, D. Lessy, T. Kaiser

{"title":"A Novel Ray-Tracing Algorithm for Non-Specular Diffuse Scattered Rays at Terahertz Frequencies","authors":"F. Sheikh, D. Lessy, T. Kaiser","doi":"10.1109/IWMTS.2018.8454694","DOIUrl":"https://doi.org/10.1109/IWMTS.2018.8454694","url":null,"abstract":"This paper presents a novel self-programmed three-dimensional (3D) ray-tracing algorithm (RTA) based on Beckmann-Kirchhoff (B-K) model for modeling diffuse scattering mechanism in non-specular directions at terahertz (THz) frequencies. The terahertz or submillimeter-wave frequencies pose unique challenges for channel modeling due to sparse and extreme frequency selective behaviour of the propagation mechanism. In particular, the most critical feature proved to provide important contributions in determining spatial and temporal dispersion in the submillimeter-wave band is the diffuse scattering mechanism, wherein an incident ray may split into a specular and several non-specular (diffused scattered) rays after bouncing off from rough materials. This makes the diffuse scattering or scattering from rough surfaces a necessary design consideration constituting a high proportion of all the propagation rays and hence, must be accounted for propagation modeling to accurately predict channel characteristics. Next, we integrate our MATLAB-based proposed algorithm to a commercial ray-tracing tool to derive a spatiotemporal model of scattered multipath propagation channels considering rough materials in a realistic office environment for both line-of-sight (LoS) and non-line-of-sight (NLoS) scenarios. So far none of the commercially available ray-tracing tools have implemented this scattering model yet.","PeriodicalId":267901,"journal":{"name":"2018 First International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126265859","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: 20

Super-Resolution FMCW Radar System at 60 GHz for 3D Measurements 用于3D测量的60 GHz超分辨率FMCW雷达系统

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454688

D. Damyanov, T. Schultze, I. Willms

引用次数: 1

Compact Optoelectronic THz Frequency Domain Spectroscopy System for Refractive Index Determination based on Fabry-Perot Effect 基于Fabry-Perot效应的紧凑光电太赫兹频域光谱系统折射率测定

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454695

S. Dülme, N. Schrinski, B. Khani, P. Lu, V. Rymanov, A. Stöhr, C. Brenner, M. Hofmann

{"title":"Compact Optoelectronic THz Frequency Domain Spectroscopy System for Refractive Index Determination based on Fabry-Perot Effect","authors":"S. Dülme, N. Schrinski, B. Khani, P. Lu, V. Rymanov, A. Stöhr, C. Brenner, M. Hofmann","doi":"10.1109/IWMTS.2018.8454695","DOIUrl":"https://doi.org/10.1109/IWMTS.2018.8454695","url":null,"abstract":"In this work, we present a compact optoelectronic THz frequency domain spectroscopy (FDS) system for determination the real part of the refractive index of a semiconductor wafer with a given thickness. The concept is based on the detection of transmission maxima, which appear due to Fabry-Perot interferences inside the wafer and which depend on the refractive index of the semiconductor material. This all-fiber based THz FDS setup consists of two external cavity laser diodes and an uni-traveling-carrier photodiode (UTC-PD) module on the emitter side, while a Schottky barrier diode (SBD) is used as THz receiver. Since we don't need any additional lenses and because of the small device dimensions, this setup is compact in size, compared with traditional bulky TDS systems. We prove our THz FDS concept by characterizing of a semi-insulating iron-doped indium phosphide (InP:Fe) wafers with different thicknesses within a frequency range from 220 GHz up to 450 GHz. Based on the determination of the free spectral range (FSR) between the Fabry-Perot transmission maxima, a refractive index of 3.475 for this frequency region is obtained. Additional THz time domain spectroscopy experiments match the THz FDS results very well and confirm our results. Furthermore, analytic calculations are in excellent agreement with the measurements. A planned transfer of this THz FDS approach to a completely hybrid or monolithic integration of all photonic devices in a compact module could be offer a very small and full mobile THz spectroscopy setup.","PeriodicalId":267901,"journal":{"name":"2018 First International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128908365","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

Metallic 3D Printed Rectangular Waveguides (WR3) for Rapid Prototyping of THz Packages 用于太赫兹封装快速成型的金属3D打印矩形波导(WR3)

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454684

S. Makhlouf, B. Khani, J. Lackmann, S. Dülme, A. Stöhr

{"title":"Metallic 3D Printed Rectangular Waveguides (WR3) for Rapid Prototyping of THz Packages","authors":"S. Makhlouf, B. Khani, J. Lackmann, S. Dülme, A. Stöhr","doi":"10.1109/IWMTS.2018.8454684","DOIUrl":"https://doi.org/10.1109/IWMTS.2018.8454684","url":null,"abstract":"In this work, laser beam melting (LBM) is used for direct 3D printing of hollow-metallic rectangular waveguides (WRs) within the WR3-band (230–320 GHz). By using laser beam melting of stainless steel (SS) 316L powder, a WR3 waveguide is fabricated in a single 3D printing process. This eliminates the need for costly mechanical and chemical post-printing processes required in traditional micromachining and non-metallic 3D printing technologies. In addition, the metallic LBM waveguides outperform the non-metallic ones in mechanical robustness. On the other hand, the surface roughness for LBM SS316L is typically higher as compared to non-metallic printed structures. For rectangular waveguides, this leads to slightly higher transmission losses. According to these performances, 3D metallic printing can be considered as a suitable technology for rapid prototyping, e.g. for high-frequency photodiode (PD) packages, where complex PD packages are printed in a single fabrication step. Since the length of the rectangular waveguide in the terahertz photodiode package is only a few millimeter long, slightly higher transmission losses can be accommodated. To investigate the use of LBM technology for THz PD packages, the impact of the surface roughness on the electrical performance of the fabricated waveguides is numerically and experimentally analyzed. The measured average inner surface roughness is about 50 µm, whereas it is about 47.7 µm at the WR3 flange surface, resulting in an RF insertion loss of about 0.7 dB/mm. By smoothing the WR3 flange surface to values as low as 2 µm via a simple milling process, RF losses are reduced down to 0.3 dB/mm.","PeriodicalId":267901,"journal":{"name":"2018 First International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133368246","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

A Comparison Study of Non-specular Diffuse Scattering Models at Terahertz Frequencies 太赫兹非镜面漫射散射模型的比较研究

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454692

F. Sheikh, D. Lessy, Mai Alissa, T. Kaiser

{"title":"A Comparison Study of Non-specular Diffuse Scattering Models at Terahertz Frequencies","authors":"F. Sheikh, D. Lessy, Mai Alissa, T. Kaiser","doi":"10.1109/IWMTS.2018.8454692","DOIUrl":"https://doi.org/10.1109/IWMTS.2018.8454692","url":null,"abstract":"At terahertz (THz) frequencies, dimensions of optically thin building materials (e.g., sand-lime brick, gypsum plaster) are comparable to or even larger than the wavelength. Such materials, normally neglected and assumed smooth evidently become rough now. A smooth material will reflect the incident ray specularly in a single direction, whilst a rough material will scatter it into various directions. Perhaps, for very rough materials the specular reflection loses its privileged position, and the non-specular diffusely scattered rays dominate the reflection behaviour. Likewise, a widely known fact that the surface roughness alters the scattered field far more than its electrical properties, emphasizes that these unique features lead to new multipath scattering models to characterize the THz channel. Effective Roughness (ER) and Beckmann-Kirchhoff (B-K) models address the problem of diffuse scattering by means of approximate models. This paper compares the aforementioned models considering the impact of diffuse scattering on total received power by employing ray-tracing tool in an indoor office environment. For this study, particular attention is diverted to the non-line-of-sight (NLoS) scenario due to its imminence in terms of coverage and performance.","PeriodicalId":267901,"journal":{"name":"2018 First International Workshop on Mobile Terahertz Systems (IWMTS)","volume":"35 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125721634","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: 15

Photonic Crystal THz High-Q Resonator for Chipless Wireless Identification 无芯片无线识别用光子晶体太赫兹高q谐振器

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454693

Alejandro Jiménez-Sáez, M. Schüßler, R. Jakoby, Christopher Krause, F. Meyer, G. V. Bögel

引用次数: 13

Experimental Validation of a Phase Control Concept for Photonically Steered Terahertz Phased Array Transmitters at Microwave Frequencies 微波频率下光导太赫兹相控阵发射机相位控制概念的实验验证

2018 First International Workshop on Mobile Terahertz Systems (IWMTS) Pub Date : 2018-07-01 DOI: 10.1109/IWMTS.2018.8454685

Xuan-He Liu, K. Kolpatzeck, L. Häring, A. Czylwik

引用次数: 1