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Experimental Validation of a Notch-Beam and Frequency-Scanning Sub-THz Radar 槽口波束和频率扫描次 THz 雷达的实验验证
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-30 DOI: 10.1109/TTHZ.2024.3471929
Mohammad-Reza Seidi;Armin Karimi;Alireza Madannejad;Umer Shah;Joachim Oberhammer
{"title":"Experimental Validation of a Notch-Beam and Frequency-Scanning Sub-THz Radar","authors":"Mohammad-Reza Seidi;Armin Karimi;Alireza Madannejad;Umer Shah;Joachim Oberhammer","doi":"10.1109/TTHZ.2024.3471929","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3471929","url":null,"abstract":"This article experimentally demonstrates a frequency-sweeping notch-beam sub-THz radar frontend based on a two-line array antenna featuring computational imaging. Operating within 237.5 GHz and 250 GHz with 12.5 GHz bandwidth, the radar utilizes a 12\u0000<inline-formula><tex-math>$lambda _{c}$</tex-math></inline-formula>\u0000 delay line to achieve frequency-sweeping capabilities. This configuration allows dynamic notch-beam scanning across angular ranges from \u0000<inline-formula><tex-math>$-$</tex-math></inline-formula>\u000026.5\u0000<inline-formula><tex-math>$^circ$</tex-math></inline-formula>\u0000 to 28\u0000<inline-formula><tex-math>$^circ$</tex-math></inline-formula>\u0000. The radar frontend is highly compact with a total size of 20 mm× 14.3 mm× 1.2 mm, including the beam-steering network, a magic-tee for creating the 180\u0000<inline-formula><tex-math>$^circ$</tex-math></inline-formula>\u0000 phase shift required for creating the notch-beam, and the antenna array, and is implemented by silicon micromachining. The radar was evaluated with single and dual-target scenarios utilizing and benchmarking different computational imaging algorithms, i.e., matched filter (MF), fast iterative shrinkage-thresholding algorithm (FISTA), and multiple signal classification (MUSIC). It was found that the MUSIC algorithm outperforms MF and FISTA in range and angular resolution in single-target scenes, achieving a range resolution of 7.8 mm and an angular resolution of 15.7\u0000<inline-formula><tex-math>$^circ$</tex-math></inline-formula>\u0000, with detection errors of less than 6.6 mm and 3.5\u0000<inline-formula><tex-math>$^circ$</tex-math></inline-formula>\u0000, respectively. Although the MUSIC algorithm maintains reliable range resolution in dual-target scenarios, it performs poorly in providing angular information.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 6","pages":"865-873"},"PeriodicalIF":3.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10700982","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MEMS Phase Shifters for THz Beam-Scanning: Demonstration With a 500–600 GHz Phased Array With Leaky-Wave Feeds 用于太赫兹波束扫描的 MEMS 移相器：使用泄漏波馈电的 500-600 GHz 相控阵演示
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-30 DOI: 10.1109/TTHZ.2024.3471898
Sven van Berkel;Subash Khanal;Sofia Rahiminejad;Cecile Jung-Kubiak;Alain Eric Maestrini;Goutam Chattopadhyay
{"title":"MEMS Phase Shifters for THz Beam-Scanning: Demonstration With a 500–600 GHz Phased Array With Leaky-Wave Feeds","authors":"Sven van Berkel;Subash Khanal;Sofia Rahiminejad;Cecile Jung-Kubiak;Alain Eric Maestrini;Goutam Chattopadhyay","doi":"10.1109/TTHZ.2024.3471898","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3471898","url":null,"abstract":"Beam-scanning capabilities for space-borne submillimeter-wave spectrometers are critical for instrument calibration and field-of-view mapping. However, the lack of low-loss waveguide-integrated phase shifters above 500 GHz has been a significant challenge for realizing Terahertz phased array antennas. Recently developed microelectromechanical system (MEMS)-actuated phase shifters have emerged as promising candidates, initially demonstrating a 145\u0000<inline-formula><tex-math>${}^circ$</tex-math></inline-formula>\u0000 phase shift. As a first demonstration of the efficacy of these phase shifters for electronic beam-steering, we present the design, fabrication, and characterization of a linear, near-Nyquist sampled, 4 × 1-element phased array operating from 500 to 600 GHz. The array element is a silicon micromachined leaky-wave feed based on a Fabry–Pérot cavity to enhance directivity and reduce grating lobes while achieving bandwidth requirements with minimal scan loss. It is shown, through measurements, that this antenna feed is suitable for use in larger 8 × 1-element arrays for applications that require moderate gain (20 dBi) and scanning (\u0000<inline-formula><tex-math>$pm 20^circ$</tex-math></inline-formula>\u0000) with a fan beam. Furthermore, we present measurement results of a second generation of MEMS phase shifters with an increased measured phase shift up to 350\u0000<inline-formula><tex-math>${}^circ$</tex-math></inline-formula>\u0000. A full 360\u0000<inline-formula><tex-math>${}^circ$</tex-math></inline-formula>\u0000 phase-wrapping capability is desired as this will enable high-gain lens-scanning phased arrays that can be used for future submillimeter-wave spectrometers.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 6","pages":"830-842"},"PeriodicalIF":3.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fiber-Coupled THz TDS System With mW-Level THz Power and up to 137-dB Dynamic Range 具有毫瓦级太赫兹功率和高达 137 分贝动态范围的光纤耦合太赫兹 TDS 系统
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-24 DOI: 10.1109/TTHZ.2024.3467173
Alexander Dohms;Nico Vieweg;Steffen Breuer;Tina Heßelmann;Robert Herda;Nadja Regner;Shahram Keyvaninia;Marko Gruner;Lars Liebermeister;Martin Schell;Robert B. Kohlhaas
{"title":"Fiber-Coupled THz TDS System With mW-Level THz Power and up to 137-dB Dynamic Range","authors":"Alexander Dohms;Nico Vieweg;Steffen Breuer;Tina Heßelmann;Robert Herda;Nadja Regner;Shahram Keyvaninia;Marko Gruner;Lars Liebermeister;Martin Schell;Robert B. Kohlhaas","doi":"10.1109/TTHZ.2024.3467173","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3467173","url":null,"abstract":"Terahertz (THz) time-domain spectroscopy (TDS) offers considerable potential for a wide range of industrial applications, including thickness determination and defect identification through imaging. Fiber-coupled THz TDS systems are particularly promising due to their flexible and robust operation in a variety of environments. However, increasing the THz power of these systems remains a critical challenge for applications that require high dynamic range in very short acquisition times. Here, we present a significant improvement of a commercially available THz TDS system by combining a novel ultrafast Er-doped fiber laser and improved iron-doped InGaAs photoconductive THz emitters. The Er-doped fiber laser offers the combination of high average power up to 70 mW and ultrashort pulse duration down to 45 fs with a fiber delivery of 6.3 m to the THz antennas. The THz emitters are optimized in terms of the photoconductive material and gap size for excitation at optical power >50 mW and provide up to (958 ± 67) µW of emitted THz power. These improvements enable a record peak dynamic range of 117 dB for 60-s acquisition time and the highest peak dynamic range ever measured in a THz TDS setup of 137 dB.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 6","pages":"857-864"},"PeriodicalIF":3.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10690264","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Toward Advanced Security Fingerprint Biometrics Using Super-Resolution Terahertz Microscopy 利用超分辨率太赫兹显微镜实现先进的安全指纹生物识别技术
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-19 DOI: 10.1109/TTHZ.2024.3465226
Yiran Cui;Panagiotis C. Theofanopoulos;Hrishikesh V. Panchawagh;Georgios C. Trichopoulos
{"title":"Toward Advanced Security Fingerprint Biometrics Using Super-Resolution Terahertz Microscopy","authors":"Yiran Cui;Panagiotis C. Theofanopoulos;Hrishikesh V. Panchawagh;Georgios C. Trichopoulos","doi":"10.1109/TTHZ.2024.3465226","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3465226","url":null,"abstract":"We propose a high spatial resolution fingerprint scanning method that utilizes subterahertz (THz) waves to image the finger skin surface and subsurface. The fingerprint is a biomarker widely used as an identifier in security applications. However, current popular fingerprint scanners mostly detect skin surface undulation and hence are vulnerable to spoofing attacks. The proposed approach leverages THz wave penetration into the multilayered skin structure to provide a unique spectral response and enable higher security fingerprint scanning. By implementing an imaging system that scans the fingerprint using a tightly focused THz beam, we present measurement results of an in-vivo finger specimen in the 330–500 GHz range. High-resolution fingerprint images and THz frequency responses are obtained. Besides, two spoof samples are fabricated using latex for comparison. The measurement results show a noticeable discrepancy compared with real skin, which can be used to distinguish fake fingerprints (spoofs).","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 6","pages":"874-883"},"PeriodicalIF":3.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
200–390 GHz Photonic Terahertz Noise Source 200-390 GHz 光子太赫兹噪声源
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-16 DOI: 10.1109/TTHZ.2024.3462095
Zeyu Zhao;Pu Li;Yuehui Sun;Lijuan Liu;Xingyu Tao;Feifei Qin;Yuncai Wang
{"title":"200–390 GHz Photonic Terahertz Noise Source","authors":"Zeyu Zhao;Pu Li;Yuehui Sun;Lijuan Liu;Xingyu Tao;Feifei Qin;Yuncai Wang","doi":"10.1109/TTHZ.2024.3462095","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3462095","url":null,"abstract":"In this article, we present a terahertz photonic noise source by photomixing three Gaussian-shaped noise slices from a superluminescent diode. Experimental results demonstrate that terahertz noise with a frequency range of 200–390 GHz can be obtained with an excess noise ratio (ENR) up to 48 ± 4.3 dB, corresponding to an equivalent noise temperature exceeding 10\u0000<sup>7</sup>\u0000 K. Furthermore, the proposed noise source is used to measure the noise figure of a mature mixer product, holding the promise of generating terahertz noise at a higher frequency and with a larger bandwidth. The proposed photonic noise source possesses a high integration and raises the frequency range and the ENR of the noise spectrum to a new level.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 6","pages":"791-798"},"PeriodicalIF":3.9,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Microwave Theory and Techniques Society Information 电气和电子工程师学会微波理论与技术协会信息
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-09 DOI: 10.1109/TTHZ.2024.3450131
{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2024.3450131","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3450131","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669949","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Microwave Theory and Techniques Society Information 电气和电子工程师学会微波理论与技术协会信息
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-09 DOI: 10.1109/TTHZ.2024.3450171
{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2024.3450171","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3450171","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669947","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Transactions on Terahertz Science and Technology Publication Information 电气和电子工程师学会太赫兹科学与技术论文集》出版信息
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-09 DOI: 10.1109/TTHZ.2024.3450175
{"title":"IEEE Transactions on Terahertz Science and Technology Publication Information","authors":"","doi":"10.1109/TTHZ.2024.3450175","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3450175","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"C3-C3"},"PeriodicalIF":3.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669948","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TechRxiv: Share Your Preprint Research with the World! TechRxiv：与世界分享您的预印本研究成果！
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-09 DOI: 10.1109/TTHZ.2024.3450771
{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TTHZ.2024.3450771","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3450771","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"663-663"},"PeriodicalIF":3.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669946","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IEEE Transactions on Terahertz Science and Technology Publication Information 电气和电子工程师学会太赫兹科学与技术论文集》出版信息
IF 3.9 2区 工程技术
IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-09-09 DOI: 10.1109/TTHZ.2024.3450133
{"title":"IEEE Transactions on Terahertz Science and Technology Publication Information","authors":"","doi":"10.1109/TTHZ.2024.3450133","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3450133","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 5","pages":"C3-C3"},"PeriodicalIF":3.9,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669941","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142159805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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