Journal of Infrared, Millimeter, and Terahertz Waves最新文献_第3页

Design of a Dual Layer, Via-free, Polarization-rotating Metasurface with Wideband Asymmetric Transmission 设计具有宽带非对称传输功能的双层、无通孔、偏振旋转元表面

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-06-04 DOI: 10.1007/s10762-024-00992-z

Chunyu Li, Peng Fei

引用次数: 0

Resonant Ring with a Gain of 36 for Use with a 1 MW 110 GHz Gyrotron 增益为 36 的谐振环，用于 1 MW 110 GHz 陀螺仪

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-31 DOI: 10.1007/s10762-024-00991-0

Elliot L. Claveau, Michael A. Shapiro, Richard J. Temkin

{"title":"Resonant Ring with a Gain of 36 for Use with a 1 MW 110 GHz Gyrotron","authors":"Elliot L. Claveau, Michael A. Shapiro, Richard J. Temkin","doi":"10.1007/s10762-024-00991-0","DOIUrl":"https://doi.org/10.1007/s10762-024-00991-0","url":null,"abstract":"A 110 GHz quasi-optical ring resonator, designed for use with a 1 MW pulsed gyrotron, has been built and successfully tested using a 100 mW solid-state source. A low reflectance (2.4%) input coupler and a low-loss, four-mirror ring demonstrated a compression ratio, defined as the ratio of output to input power, of 36. The 6 ns output pulses were generated from the 2 m length ring using a silicon laser-driven semiconductor switch (LDSS). The quasi-optical ring resonator was designed with large waist sizes so that input pulses of up to 1 MW will stay under the 35 kV/cm electric field limit for ionization in ambient air. Maximum compression gain was achieved by matching the input coupling fraction to the round trip loss in the ring, achieving close to critical coupling. The experimental output pulse shape obtained after firing the LDSS was modeled using the reflectance, transmittance, and absorptance of the switch vs. time and vs. laser pulse fluence, with good agreement found with theory. The timing for the peak energy efficiency of 32% was found and the main loss mechanism limiting that efficiency was found to be the absorptance in the silicon wafer.","PeriodicalId":16181,"journal":{"name":"Journal of Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141192608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

W-band Dual-band Filter and Diplexer Based on Mixed TE301- and TE102-Mode Cavities 基于 TE301 和 TE102 混合模式腔体的 W 波段双频滤波器和双工器

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-17 DOI: 10.1007/s10762-024-00989-8

Jiang-Qiao Ding, Ronghuai Nie, Yun Zhao, Jun Jiang, Kun Huang, Sheng Li

引用次数: 0

Performance Degradation Caused by Ionization of the Released Gas Molecules in W-Band Gyrotron Traveling Wave Tube Based on a Simplified Ionization Model 基于简化电离模型的 W 波段陀螺仪行波管中释放的气体分子电离导致的性能衰减

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-17 DOI: 10.1007/s10762-024-00988-9

Yu Wang, Guo Liu, Wei Jiang, Yelei Yao, Jianxun Wang, Yong Luo

引用次数: 0

Pattern Diversity Based Four-Element Dual-band MIMO Patch Antenna for 5G mmWave Communication Networks 用于 5G 毫米波通信网络的基于模式分集的四元件双频 MIMO 贴片天线

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-10 DOI: 10.1007/s10762-024-00983-0

Waleed Tariq Sethi, Saad Hassan Kiani, Mehre E. Munir, Daniyal Ali Sehrai, Huseyin şerif savci, Dawar Awan

{"title":"Pattern Diversity Based Four-Element Dual-band MIMO Patch Antenna for 5G mmWave Communication Networks","authors":"Waleed Tariq Sethi, Saad Hassan Kiani, Mehre E. Munir, Daniyal Ali Sehrai, Huseyin şerif savci, Dawar Awan","doi":"10.1007/s10762-024-00983-0","DOIUrl":"https://doi.org/10.1007/s10762-024-00983-0","url":null,"abstract":"This study presents a planar dual-band multiple-input multiple-output (MIMO) antenna design for the prospective fifth-generation (5G) frequency bands of 28 and 38 GHz. The antenna element is designed by utilizing a rectangular patch with an offset microstrip feeding technique. A dual-band response is achieved by placing semi-circular slots on each side of the patch element. To tune the frequency response and improve impedance matching, vertical rectangular slits are etched in the rectangular patch and the ground plane, respectively. The results show that the single antenna element offers an impedance bandwidth of 2.52 GHz (26.32–28.84 GHz) and 7.5 GHz (34–41.5 GHz). In addition, a MIMO configuration based on pattern diversity using four antenna elements is designed and fabricated. The designed MIMO configuration achieves an impedance bandwidth of 3 GHz (27–30 GHz) and 5.46 GHz (35.54–41 GHz) at operating bands of 28 and 38 GHz. The peak realized gain for the single element at 28 and 38 GHz is noted to be 7.4 dBi and 7.5 dBi, respectively. Furthermore, the polarization diversity configuration illustrates an isolation of > 15 dB and > 25 dB for the 28 and 38 GHz frequency bands, respectively. Moreover, the MIMO configuration attains appropriate values for the envelope correlation coefficient (ECC) and diversity gain (DG), Total Active Reflection Co-efficient (TARC), Channel Capacity Loss (CCL) and Mean Effective Gain (MEG) for the operating frequency bands. The proposed MIMO system based on results seems to be potential choice for mmwave Ka Band Applications.","PeriodicalId":16181,"journal":{"name":"Journal of Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140936507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hybrid Subterahertz Atmospheric Pressure Plasmatron for Plasma Chemical Applications 用于等离子化学应用的混合式次赫兹大气压力等离子体加速器

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-07 DOI: 10.1007/s10762-024-00987-w

S. V. Sintsov, A. V. Vodopyanov, D. A. Mansfeld, A. P. Fokin, A. A. Ananichev, A. A. Goryunov, E. I. Preobrazhensky, N. V. Chekmarev, M. Yu. Glyavin

引用次数: 0

Static Reflective Surfaces for Improved Terahertz Coverage 提高太赫兹覆盖率的静态反射表面

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-05-06 DOI: 10.1007/s10762-024-00985-y

Thanh Le, Suresh Singh

{"title":"Static Reflective Surfaces for Improved Terahertz Coverage","authors":"Thanh Le, Suresh Singh","doi":"10.1007/s10762-024-00985-y","DOIUrl":"https://doi.org/10.1007/s10762-024-00985-y","url":null,"abstract":"LoS (Line of Sight) MIMO (Multiple Input Multiple Output) is considered the best way to deliver high-capacity channels for terahertz communications due to the severe attenuation suffered by reflected components. Unfortunately, terahertz links are easily blocked by any obstruction resulting in link breakage. Therefore, it is necessary to provide alternative paths via reflectors. A problem shared by LoS paths and reflected paths (via polished reflectors) is that the channel matrix is rank 1 in the far field. As a result, the achieved capacity is lower than what can theoretically be achieved in a rich multi-path environment. In this work, we simultaneously solve the channel rank problem and the coverage problem by using static reflective surfaces which provide limited scattering of the incident signal in a way that minimizes signal loss but provides multiple paths to the receiver with varying phase. We construct such a surface and characterize the received signal using a terahertz testbed. We show that using our surface, we can improve channel capacity for 2 × 2 LoS MIMO. We also develop a theoretical model for the received signal and show that the reflected capacity matches the measured capacity well.","PeriodicalId":16181,"journal":{"name":"Journal of Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140884750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Augmented Reality Terahertz (AR-THz) Sensing and Imaging with Frequency-Modulated Continuous-Wave Radar 利用频率调制连续波雷达进行太赫兹增强现实（AR-THz）传感和成像

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-04-30 DOI: 10.1007/s10762-024-00984-z

Jean-Paul Guillet, Frédéric Fauquet, Jean Rioult

引用次数: 0

Real-time Monitoring of Hydration Reaction of Theophylline Anhydrous via Terahertz Attenuated Total Reflection Time Domain Spectroscopy 通过太赫兹衰减全反射时域光谱实时监测无水茶碱的水合反应

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-04-26 DOI: 10.1007/s10762-024-00986-x

Kazuhiro Takahashi, Koichiro Akiyama, Kazuki Horita, Tomoaki Sakamoto, Hiroshi Satozono

{"title":"Real-time Monitoring of Hydration Reaction of Theophylline Anhydrous via Terahertz Attenuated Total Reflection Time Domain Spectroscopy","authors":"Kazuhiro Takahashi, Koichiro Akiyama, Kazuki Horita, Tomoaki Sakamoto, Hiroshi Satozono","doi":"10.1007/s10762-024-00986-x","DOIUrl":"https://doi.org/10.1007/s10762-024-00986-x","url":null,"abstract":"In pharmaceuticals, pseudo-polymorphism, e.g., the existence of hydrate and anhydrous forms, affects their physicochemical characteristics. Therefore, the evaluation of pseudo-polymorphism is one of the most important quality analyses. In this research, we investigate the real-time monitoring of the hydration reaction of theophylline using terahertz attenuated total reflection time domain spectroscopy (THz-attenuated total reflection (ATR)-TDS). We continuously measured a mixture of hydroxypropyl cellulose solution and theophylline anhydrous (TPA) while keeping it pressed to the ATR surface. We observed that the absorption peaks derived from TPA decreased and those derived from theophylline monohydrate (TPM) increased with time, demonstrating that the hydrate reaction of TPA can be monitored. Subsequently, we performed an accurate and quantitative evaluation of the hydration reaction by calculating the temporal changes in the crystal form ratio of TPM based on the changes in its second derivative peak intensity followed by a curve fitting. In addition, we performed real-time monitoring of the reaction using two different pressure mechanisms, finding that using a weight to apply pressure provided better reproducibility than using a screw. This study demonstrates that THz spectroscopy is a useful method for the evaluation of pseudo-polymorphism in pharmaceuticals.","PeriodicalId":16181,"journal":{"name":"Journal of Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140802485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Experimental Delay Tests in Causal THz Channel Model 因果太赫兹通道模型的实验延迟测试

IF 2.9 3区工程技术

Journal of Infrared, Millimeter, and Terahertz Waves Pub Date : 2024-04-24 DOI: 10.1007/s10762-024-00981-2

Zhaona Wu, K. Umebayashi, Janne J. Lehtomäki, Nizar Zorba

引用次数: 0