IEEE Transactions on Terahertz Science and Technology最新文献

{"title":"A 225-GHz Coupled Harmonic Oscillator With −179 dBc/Hz FoM in 65-nm CMOS","authors":"Yue Liang;Jing Feng;Qin Chen;Xu Wu;Xiangning Fan;Lianming Li","doi":"10.1109/TTHZ.2025.3532157","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3532157","url":null,"abstract":"This letter presents a 225-GHz coupled second harmonic oscillator. The single-ended oscillator core utilizes a piecewise linear model with a phase factor to analyze the impact of the large-signal fundamental (<inline-formula><tex-math>$bm {f}_{bm {0}}$</tex-math></inline-formula>) voltages on the second-harmonic (<inline-formula><tex-math>$bm {2f}_{bm {0}}$</tex-math></inline-formula>) current, enabling the selection of optimal transistor conditions for efficient <inline-formula><tex-math>$bm {f}_{bm {0}}$</tex-math></inline-formula> oscillation and <inline-formula><tex-math>$bm {2f}_{bm {0}}$</tex-math></inline-formula> generation. To achieve good phase noise and output power performance, the coupling scheme of eight oscillator cores is proposed without extra components to suppress unwanted modes. Fabricated in a 65-nm CMOS process, the coupled oscillator generates 0.407-mW output power while consuming 40.5 mW from a 0.75-V power supply voltage. The measured dc-to-RF efficiency of the oscillator is 1% and the phase noise is −88 dBc/Hz at 1 MHz offset, resulting in a figure of merit of −179 dBc/Hz.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"291-295"},"PeriodicalIF":3.9,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553039","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}

{"title":"Multiuser Long-Distance Sub-THz Wireless Communication","authors":"Joel Dittmer;Akanksha Bhutani;Felix Beuthan;Luca Valenziano;Sandrine Wagner;Axel Tessmann;Christian Koos;Thomas Zwick;Sebastian Randel","doi":"10.1109/TTHZ.2025.3530757","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3530757","url":null,"abstract":"In this article, we present the first point-to-multipoint (P2MP) subterahertz (THz) wireless communication link capable of simultaneously transmitting data to multiple users over several meters at tens of gigabits per second (Gbps). The sub-THz wireless link employs an optoelectronic transmitter that generates digital subcarriers by modulating a single free-running laser with a high-bandwidth electro-optic inphase and quadrature modulator. A unitraveling-carrier photodiode downconverts the transmitted signal from the optical to the sub-THz domain, and the signal is transmitted by a lens-integrated leaky-wave antenna, offering a gain of up to 30 dBi and a wide beam-steering range of approximately 51° in the horizontal plane. The optoelectronic transmitter can simultaneously address multiple receiver units, i.e., users, hence enabling efficient multiuser operation. A sub-THz electronic receiver unit operating from 280 to 320 GHz is used for reception. In a proof-of-concept experiment, the sub-THz wireless link is implemented in a lecture hall scenario with one transmitter and two receiver units. The distance between the transmitter and receivers is 16 m, with the two receivers having a maximum spacing of 3.3 m. Measurements have been conducted for single-, dual-, and up to four-user configurations using quadrature phase-shift keying and 16-quadrature amplitude modulation modulation schemes. To the best of the authors' knowledge, record-high data rates of up to 80 Gbps for a single user, 40 Gbps for dual users, and 20 Gbps for four users are demonstrated for the first time in a sub-THz P2MP system.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"332-343"},"PeriodicalIF":3.9,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10843358","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904628","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}

{"title":"Silicon-Micromachined Wideband Sub-THz Frequency-Diverse Antenna","authors":"Mohammad-Reza Seidi;Mohammad Mehrabi Gohari;Alireza Madannejad;Umer Shah;Joachim Oberhammer","doi":"10.1109/TTHZ.2025.3528231","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3528231","url":null,"abstract":"This article presents the first compact, wideband, silicon-micromachined frequency-diverse antenna, operating across the 220–330 GHz range, designed explicitly for sub-THz imaging applications. The antenna consists of 80 slot radiating elements of twelve distinct sizes corresponding to half of the uniformly sampled wavelengths within the operating bandwidth. These elements are arranged in a Mills-Cross configuration for antenna designs A and B, supported by an innovatively shaped air-filled cavity. The cavity is engineered to support multiple higher-order, high-Q resonance modes, generating highly frequency-diverse, pseudorandom radiation patterns. The frequency-diverse antenna is fed by a three-section impedance-matching transitional direct waveguide and is fabricated using advanced silicon micromachining technology. This article comprehensively analyzes the antenna's radiation patterns and impedance matching across the entire waveguide band. The compact prototype, with an overall size of 18 mm × 16 mm × 0.933 mm (effective antenna dimensions of 11<inline-formula><tex-math>$lambda times 11lambda times 0.85lambda$</tex-math></inline-formula>), is the most compact air-filled, cavity-backed frequency-diverse antenna reported to date. It demonstrates high radiation efficiency and is designed for direct mounting on a standard WR-3.4 waveguide flange. The antenna achieves a fractional bandwidth of 34%, with a return loss better than 10 dB, extending to 40% with a return loss better than 5 dB.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"456-463"},"PeriodicalIF":3.9,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10836891","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908412","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}

{"title":"IEEE Microwave Theory and Techniques Society Information","authors":"","doi":"10.1109/TTHZ.2024.3520370","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520370","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"C2-C2"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938252","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}

{"title":"IEEE Transactions on Terahertz Science and Technology Information for Authors","authors":"","doi":"10.1109/TTHZ.2024.3520372","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520372","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"137-138"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832407","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938318","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}

{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TTHZ.2024.3520433","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520433","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"140-140"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832421","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938200","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}

{"title":"IEEE Women in Engineering","authors":"","doi":"10.1109/TTHZ.2024.3520431","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520431","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"139-139"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938236","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}

{"title":"IEEE Transactions on Terahertz Science and Technology Publication Information","authors":"","doi":"10.1109/TTHZ.2024.3520374","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3520374","url":null,"abstract":"","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 1","pages":"C3-C3"},"PeriodicalIF":3.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10832417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938237","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}

{"title":"Terahertz Integrated Polarization Filter Based on Slotted Bragg Grating","authors":"Linxi Chen;Weijie Gao;Christophe Fumeaux;Withawat Withayachumnankul","doi":"10.1109/TTHZ.2024.3518083","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3518083","url":null,"abstract":"All-silicon substrateless integrated systems are suitable to wide-ranging terahertz applications due to their low-loss characteristics. A broadband, high-extinction level polarization filter is in demand for these on-chip systems to select the desired polarization when monomode operation of the dielectric host waveguide is required. Existing photonic designs for polarization filtering cannot cope with a large fractional bandwidth in the terahertz range. To increase the bandwidth and rejection level of the filter, a longitudinal slot is introduced into the host waveguide. Experimental validation shows a high average polarization extinction ratio of 23.5 dB between the TM and TE polarizations and an insertion loss of around 1.5 dB for the TM polarization over a 3-dB bandwidth of 87 GHz covering the whole IEEE communications band between 252 and 325 GHz. The proposed filter will be an essential component for terahertz communications to maintain the polarization purity in substrateless dielectric waveguides.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"473-480"},"PeriodicalIF":3.9,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904614","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}

{"title":"High-Performance Reverse-Coupler OMT With Submicron Alignment for the 209–281 GHz Band","authors":"Alessandro Navarrini;Philip Dindo;Anthony R. Kerr;Joseph Lambert;F. Patricio Mena;Greg Morris;Benjamin Casto;John Effland;Kamaljeet Saini","doi":"10.1109/TTHZ.2024.3518095","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3518095","url":null,"abstract":"We describe the design, construction, and performance of a waveguide orthomode transducer (OMT) for the 209–281 GHz frequency band. The device is one of three candidates being considered for deployment in the upgraded Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 receiver, known as “Band 6v2,” currently under development by the National Radio Astronomy Observatory (NRAO). The OMT is based on a symmetric reverse coupler structure. It has a circular waveguide input port (diameter 1.29 mm) and two single-mode oval waveguide output ports with full-radius corners matched to WR3.7 rectangular waveguide (0.94 mm × 0.47 mm). A circular-to-square waveguide transition is used on the input side. The two oval waveguide outputs have E-plane orientations parallel to each other and are located on opposite sides of the OMT module. The device was optimized using a commercial 3D electromagnetic simulator. The OMT consists of a split-block assembly, fabricated using a conventional CNC micromilling machine. It was tested at room temperature using a commercial vector network analyzer equipped with WR-3.4 frequency extension modules. An initial OMT design demonstrated excellent performance but was susceptible to micron alignment shifts. These shifts, caused by thermal contraction during cryogenic cooling, resulted in inconsistent isolation and cross-polarization. To overcome these problems, innovative alignment and module locking techniques were developed to ensure stable OMT operation with thermal cycling. This article details these methods and their successful implementation. Across the 209–281 GHz band, the measured input and output return losses exceed 17 dB, the room temperature insertion losses are less than 0.5 dB, isolations surpass 52 dB and cross-polarizations are greater than 40 dB for both polarization channels. The device meets the requirements set for the ALMA Band 6v2 OMT. The OMT design is scalable to higher frequencies, and the alignment and locking techniques are suitable for submillimeter applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"228-241"},"PeriodicalIF":3.9,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553159","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}