IEEE Transactions on Terahertz Science and Technology最新文献_第4页

WR-4.3 and WR-2.8 Band Waveguide Filters Using Micro Deformed Dual-Mode Cylindrical Resonators 使用微变形双模圆柱谐振器的WR-4.3和WR-2.8带波导滤波器

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-31 DOI: 10.1109/TTHZ.2025.3537467

Keqing Wang;Xiaozhu Wen;Guanghua Shi;Zhen Wang;Anxue Zhang;Yang Yu;Cheng Guo

{"title":"WR-4.3 and WR-2.8 Band Waveguide Filters Using Micro Deformed Dual-Mode Cylindrical Resonators","authors":"Keqing Wang;Xiaozhu Wen;Guanghua Shi;Zhen Wang;Anxue Zhang;Yang Yu;Cheng Guo","doi":"10.1109/TTHZ.2025.3537467","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3537467","url":null,"abstract":"This letter presents two WR-4.3 and WR-2.8 band fourth order waveguide dual-mode filters, fabricated by micro metal additive manufacturing technology. For the first time, microdeformed TM110 dual-mode cylindrical resonators are employed to realize both mode coupling and frequency tuning. This structure is more compatible with additive manufacturing. One filter centered at 220 GHz has a bandwidth of 4.5% (referred to as filter A), while another one centered at 340 GHz has a bandwidth of 1.2% (referred to as filter B). To achieve tuning and coupling, a rectangular iris structure integrated with the cylindrical resonator is introduced. Compared to classical structures, such as inserting screws or using local small perturbations, the proposed design utilizes a globally distributed small deformation, minimizing abrupt features in the cavities. This approach significantly reduces sensitivity to random manufacturing errors, resulting in good agreement between theoretical and fabricated results. The best measured return loss within the passband is 19 dB for filter A and 13.5 dB for filter B, while the insertion loss is 0.5 dB for filter A and 1.7 dB for filter B. The average center frequency shift is about 0.1% of 220 GHz and 0.35% of 340 GHz, respectively.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"531-535"},"PeriodicalIF":3.9,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908391","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

Micromachined High Gain Diagonal Horn Array Antenna With Suppressed Grating Lobes for 190 GHz-250 GHz 190 GHz-250 GHz抑制光栅瓣的微机械高增益对角喇叭阵列天线

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-30 DOI: 10.1109/TTHZ.2025.3536329

Yun Zhao;Shao-Min Zhang;Fan Ye;Sheng Li;Shi-Cheng Yang;Cai-Xia Wang;Jiang-Qiao Ding

{"title":"Micromachined High Gain Diagonal Horn Array Antenna With Suppressed Grating Lobes for 190 GHz-250 GHz","authors":"Yun Zhao;Shao-Min Zhang;Fan Ye;Sheng Li;Shi-Cheng Yang;Cai-Xia Wang;Jiang-Qiao Ding","doi":"10.1109/TTHZ.2025.3536329","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3536329","url":null,"abstract":"This article presents a high gain, broadband silicon micromachined diagonal horn array antenna for the 190 to 250 GHz frequency band. The antenna array is configured to be built from 34 silicon layers. The upper 25 layers of silicon wafers create an 8 × 8 diagonal horn array antenna and the lower 9 layers form the feed network. The diagonal horn is selected as a radiation element for its 45° polarization direction, which suppresses side and grating lobes in the <italic>E-plane and <italic>H-plane after array formation. Polarization converters are innovatively employed in the feed network to resolve the issue of opposite polarization from waveguide T-junctions. In order to meet the silicon micromachining criteria, all diagonal horns and the feed network are step-profiled designed based on silicon wafer thickness. The 34 silicon layers are aligned and fixed by computer numerical control-milling metal tooling. Monte Carlo analysis is utilized to quantify the interlayer offset errors introduced during the assembly of the wafers. The measurement results are within the error allowance. The antenna achieves a peak gain of 30.9 dBi and a working frequency bandwidth of 27%. Characterized by highly directive radiation patterns with low side lobe levels in the <italic>E-plane and <italic>H-plane, the antenna is well-suited for next-generation THz point-to-point communication systems.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"464-472"},"PeriodicalIF":3.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904667","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

An Interlaboratory Comparison of On-Wafer S-Parameter Measurements up to 1.1 THz 高达1.1太赫兹的片上s参数测量的实验室间比较

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-30 DOI: 10.1109/TTHZ.2025.3537461

Faisal Ali Mubarak;Gia Ngoc Phung;Uwe Arz;Kamel Haddadi;Isabelle Roch-Jeune;Guillaume Ducournau;Thomas Flisgen;Ralf Doerner;Djamel Allal;Divya Jayasankar;Jan Stake;Robin Schmidt;Gavin Fisher;Nick M. Ridler;Xiaobang Shang

{"title":"An Interlaboratory Comparison of On-Wafer S-Parameter Measurements up to 1.1 THz","authors":"Faisal Ali Mubarak;Gia Ngoc Phung;Uwe Arz;Kamel Haddadi;Isabelle Roch-Jeune;Guillaume Ducournau;Thomas Flisgen;Ralf Doerner;Djamel Allal;Divya Jayasankar;Jan Stake;Robin Schmidt;Gavin Fisher;Nick M. Ridler;Xiaobang Shang","doi":"10.1109/TTHZ.2025.3537461","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3537461","url":null,"abstract":"This article reports on an interlaboratory measurement comparison involving on-wafer S-parameter measurements from 10 GHz to 1.1 THz. Seven laboratories are involved, and each participant has measured an individual reference substrate fabricated from a high-resistivity silicon wafer in the same batch. One- and two-port co-planar waveguide (CPW) structures are designed, simulated, and fabricated. The measurements from 10 GHz to 1.1 THz, extending across six frequency bands, are conducted using different equipment in terms of vendors and specifications (e.g., probe pitch size). Despite such differences, this interlaboratory study has shown a generally good agreement between results from different participants when uncertainties are considered. The comparison with simulated reference values demonstrates agreement within 0.08 for <inline-formula><tex-math>$|S_{11}|$</tex-math></inline-formula> and 2 dB for <inline-formula><tex-math>$|S_{21}|$</tex-math></inline-formula> measurements of matched devices up to 1.1 THz. The measurement comparison demonstrates the need for a standardized measurement approach and, with that, a potential to achieve accurate on-wafer CPW measurements up to THz frequencies, underpinning the development of integrated circuits for such high frequencies.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"344-358"},"PeriodicalIF":3.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10858780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904639","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

Site-Specific Ray-Tracing and Experimental Validation for THz Channel Characterization 太赫兹通道表征的特定位置光线追踪和实验验证

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-27 DOI: 10.1109/TTHZ.2025.3534736

Zhiqiang Yuan;Guangcheng Yu;Yejian Lyu;Jianhua Zhang;Fengchun Zhang;Wei Fan

{"title":"Site-Specific Ray-Tracing and Experimental Validation for THz Channel Characterization","authors":"Zhiqiang Yuan;Guangcheng Yu;Yejian Lyu;Jianhua Zhang;Fengchun Zhang;Wei Fan","doi":"10.1109/TTHZ.2025.3534736","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3534736","url":null,"abstract":"Terahertz (THz) technology is seen as a key component of the upcoming 6G networks due to the huge untapped spectrum. Accurate channel models are crucial for the design and development of such THz communication and sensing systems. As the THz channel exhibits unique features including high propagation loss, sparsity, and near-field properties (with ultramassive multiple-input multiple-output systems), deterministic ray-tracing (RT), which can simulate wireless channels in a site-specific manner based on the high-frequency approximation of Maxwell's equation, is considered suitable for THz channel modeling. However, a thorough analysis of RT-based THz channel modeling and its extensive experimental validation (especially at 300 GHz) is still missing in the literature. In this article, we develop an RT modeling framework tailored for THz channels, which incorporates processes of environment reconstruction and electromagnetic calculation, material calibration, and acceleration. Then, three measurements with 14 locations ranging from 3 to 58 m covering frequency bands at 300 and 100 GHz are used to validate the developed RT framework. It is observed that there is an excellent match for the dominant paths between the real-world measurements and the RT results, and the near-field characteristics are realistically and accurately captured in the modeling. Furthermore, the validated RT framework is employed to enable an in-depth THz channel characterization at 300 GHz in an indoor hall scenario. This analysis is rooted in extensive channel data across 30 locations, consisting of experimental data at 12 locations in the first measurement and RT-simulated data for another 18 locations. The developed RT framework and the channel characterization aim to provide insights for future THz channel modeling and standardization studies.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 3","pages":"319-331"},"PeriodicalIF":3.9,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904595","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

A Novel Polarization-Maintaining Antiresonant Waveguide for Low-Terahertz Transmission 一种用于低太赫兹传输的新型保偏反谐振波导

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-27 DOI: 10.1109/TTHZ.2025.3534749

Qiyuan Mu;Shijie Wang;Depeng Kong;Yuan Yuan;Zhen Liu

{"title":"A Novel Polarization-Maintaining Antiresonant Waveguide for Low-Terahertz Transmission","authors":"Qiyuan Mu;Shijie Wang;Depeng Kong;Yuan Yuan;Zhen Liu","doi":"10.1109/TTHZ.2025.3534749","DOIUrl":"https://doi.org/10.1109/TTHZ.2025.3534749","url":null,"abstract":"In this article, a high birefringence and low loss polarization-maintaining terahertz waveguide based on the antiresonant mechanism is proposed, of which the cladding comprises six circular tubes and four curved thin walls. The thickness difference between the horizontal outer tubes and the vertical circular tubes brings a high birefringence, which can be further improved by the structural difference attributable to the nested tubes. Moreover, the nested tubes and four curved thin walls also reduce waveguide losses. The simulated results show that the birefringence of the designed waveguide at 0.14 THz is 0.00165, and the <italic>x-polarized and <italic>y-polarized loss is 0.096 dB/cm and 0.104 dB/cm, respectively. In addition, fabricated waveguides by three-dimensional printing technology are characterized by a single-frequency system working in 0.14 THz and a THz time-domain spectroscopy (THz-TDS) system. The experimental results by the THz-TDS system show that the waveguide has two low-loss antiresonant windows (0.13–0.16 THz and 0.26–0.33 THz), which agree with the simulated results. The birefringence of the waveguide at 0.14 THz is 0.0038, and the transmission loss of the two polarizations is 0.17 and 0.165 dB/cm, respectively. Moreover, the waveguide achieves minimum experimental <italic>x-polarized losses of 0.077 dB/cm @0.29 THz and <italic>y-polarized losses of 0.073 dB/cm @0.29 THz. The polarization ratio of the waveguide measured by the single-frequency system also verified the polarization-maintaining ability, which changes from 96.81% to 96.46% after the 0.14 THz wave passes through the waveguide. This proves that our proposed waveguide can effectively transmit low-terahertz waves while maintaining the direction of incident linearly polarized waves.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"15 2","pages":"250-259"},"PeriodicalIF":3.9,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553178","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

THz Metal-Mesh Bandpass Filters With Diamond-Shaped Apertures for Sensitive THz Receivers 太赫兹金属网带通滤波器与钻石形孔径的敏感太赫兹接收器

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-27 DOI: 10.1109/TTHZ.2025.3534757

Changyun Yoo;Jeffrey L. Hesler;Boris S. Karasik

引用次数: 0

A 225-GHz Coupled Harmonic Oscillator With −179 dBc/Hz FoM in 65-nm CMOS - 179 dBc/Hz FoM的65nm CMOS 225 ghz耦合谐振子

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-20 DOI: 10.1109/TTHZ.2025.3532157

Yue Liang;Jing Feng;Qin Chen;Xu Wu;Xiangning Fan;Lianming Li

{"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}

引用次数: 0

Multiuser Long-Distance Sub-THz Wireless Communication 多用户远距离亚太赫兹无线通信

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-16 DOI: 10.1109/TTHZ.2025.3530757

Joel Dittmer;Akanksha Bhutani;Felix Beuthan;Luca Valenziano;Sandrine Wagner;Axel Tessmann;Christian Koos;Thomas Zwick;Sebastian Randel

{"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}

引用次数: 0

Silicon-Micromachined Wideband Sub-THz Frequency-Diverse Antenna 硅微加工宽带次太赫兹分频天线

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-10 DOI: 10.1109/TTHZ.2025.3528231

Mohammad-Reza Seidi;Mohammad Mehrabi Gohari;Alireza Madannejad;Umer Shah;Joachim Oberhammer

{"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}

引用次数: 0

IEEE Microwave Theory and Techniques Society Information IEEE微波理论与技术学会信息

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2025-01-07 DOI: 10.1109/TTHZ.2024.3520370

引用次数: 0