Microwave and Optical Technology Letters最新文献

Design of Angular Stability Dual-Stopband Frequency-Selective Surface With Tightly Spaced Frequency Response Characteristics 具有紧密间隔频率响应特性的角稳定双阻带选频面设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-30 DOI: 10.1002/mop.70262

Shun Jin, Huaxin Zhu, Dongming Guo, Ze Wang

{"title":"Design of Angular Stability Dual-Stopband Frequency-Selective Surface With Tightly Spaced Frequency Response Characteristics","authors":"Shun Jin, Huaxin Zhu, Dongming Guo, Ze Wang","doi":"10.1002/mop.70262","DOIUrl":"https://doi.org/10.1002/mop.70262","url":null,"abstract":"<div>\u0000 \u0000 <p>With the development of electronic communication and wireless communication devices, some traditional multi-frequency system designs are no longer suitable for closely spaced applications, so there is an urgent need to propose some new closely spaced frequency-selective surface (FSS) designs. In this study, a novel dual-stopband FSS design with closely spaced frequency response characteristics is presented. The structure resonates at 6.75 and 8.72 GHz with a frequency ratio of 1.29, features a compact unit cell size of 8.0 × 8.0 mm, supports TE and TM incidence angles up to 80°, and maintains low insertion loss at the transmission poles to ensure precise signal transmission. In addition, a novel closely spaced design approach is presented to reduce interference between neighboring resonances and improve frequency stability. By studying the surface current distribution and the equivalent circuit model, the correlation between the geometrical element parameters and the resonance frequency is thoroughly analyzed, and the design is optimized accordingly. Finally, a prototype FSS was fabricated and its superior shielding performance was verified in a microwave darkroom. The proposed FSS achieves lower frequency ratios, smaller cell sizes, and significantly improved frequency stability compared to previous designs.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144171239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Application of FDTD for Accurate Scattering From Stratified Media With/Without Target FDTD在有/无目标分层介质精确散射中的应用

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-28 DOI: 10.1002/mop.70252

Chao Yang, Zehua Tang, Haiyan Xie, Zaigao Chen, Taijiao Du, Hailiang Qiao

引用次数: 0

A New Expression for Efficient Calculation of Time-Domain Reflection Coefficients of UWB Pulses on Debye Medium Surface 一种有效计算超宽带脉冲在德拜介质表面时域反射系数的新表达式

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-24 DOI: 10.1002/mop.70251

Yuncheng Mo, Wanchun Tang, Jianfeng Gu, Gang zhang, Yan Jiang

引用次数: 0

Single-Layer Polarization Insensitive Frequency Selective Surface Design for Microwave Applications 微波应用的单层偏振不敏感频率选择表面设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-22 DOI: 10.1002/mop.70244

Deepa Jeyaraman, Suganthi Santhanam

{"title":"Single-Layer Polarization Insensitive Frequency Selective Surface Design for Microwave Applications","authors":"Deepa Jeyaraman, Suganthi Santhanam","doi":"10.1002/mop.70244","DOIUrl":"https://doi.org/10.1002/mop.70244","url":null,"abstract":"<div>\u0000 \u0000 <p>This study introduces a compact, single-layer frequency selective surface (FSS) with multiple frequency bands, designed and simulated using CST Microwave Studio. The FSS is made to resonate at multiple frequencies, achieving significantly lower attenuation levels of −37 dB at 4.4 GHz, making it suitable for medical diagnostic applications, such as breast cancer detection. It also operates with −29 dB at 8.7 GHz (X and C bands, IEEE 802.11a for wireless networks), −13 dB at 13 GHz (low Ku band, commonly used in satellite communications per ITU standards), and −18 dB at 16.5 GHz, which supports microwave thermal therapies for cancer treatment. The FSS is designed on an FR4 substrate with a dielectric constant of 4.4. It has a thickness of 0.8 mm, resulting in a compact unit cell dimension of 0.147λ x 0.147λ. This compact structure makes it appropriate for embedded or space-limited applications. The design exhibits strong angular stability, maintaining consistent resonant behavior up to a 60° angle of incidence, and demonstrates polarization insensitivity up to 90°, ensuring reliable performance across a range of signal orientations. These characteristics make the FSS highly adaptable to real-world applications across healthcare, telecommunications, and satellite industries. This study underscores the FSS's broad applicability in advanced microwave technologies, providing a versatile solution for interference suppression and signal control within critical frequency bands.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Compact Dual-Band and Dual-Circularly Polarized Stacked Antenna With Capacitive Feeding 电容馈电的紧凑型双频双圆极化堆叠天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-22 DOI: 10.1002/mop.70231

Guo-Ping Gao, Wen-Di Guo, Li-Jun Jin, Jin-Ming Bai, Dan Wang, Bin Hu

{"title":"Compact Dual-Band and Dual-Circularly Polarized Stacked Antenna With Capacitive Feeding","authors":"Guo-Ping Gao, Wen-Di Guo, Li-Jun Jin, Jin-Ming Bai, Dan Wang, Bin Hu","doi":"10.1002/mop.70231","DOIUrl":"https://doi.org/10.1002/mop.70231","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a novel wearable dual-band and dual-circularly polarized antenna is proposed. Initially, the study is dedicated to the construction of unidirectional radiation using the TM<sub>01</sub> mode of the square patch and the TM<sub>11</sub> mode of the circular patch. Then, the symmetric oblique angles are cut out of the bottom square patch to resonate the left-hand circular polarization (LHCP) at low frequency band and asymmetric slots are etched on the top circular patch to resonate the right-hand circular polarization (RHCP) at high frequency band. Additionally, the impedance matching is improved by utilizing a rectangular slot on the bottom patch, enabling the antenna to cover the entire 2.45 GHz ISM frequency band at low frequency band. Besides, stable performance of the antenna is obtained when setting on different parts of the human body. The calculated specific absorption rate (SAR) values at both 2.45 and 3.6 GHz are all far lower than the upper limit of IEEE C95.1-2005 and EN 50361-2001. These properties proved the proposed antenna is suitable for wearable systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Low-Loss Bandpass Filter With Intertwined Spiral Inductor Using GaAs-IPD Technology 基于GaAs-IPD技术的螺旋电感缠绕低损耗带通滤波器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-22 DOI: 10.1002/mop.70241

Yi-Jian Cai, Hao Sun, Yun Sun, Rong Qian, Cai-Yan Li, Hui-Feng Ding, Zhi-Ying Chen, Xian-Li Tang, Xiu-li Gao, Xiao-Wei Sun, Qian Gong

引用次数: 0

High-Contrast Asymmetric Transmission Using the Transparent Conducting Oxides Thin Film Structure 利用透明导电氧化物薄膜结构的高对比度非对称传输

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-21 DOI: 10.1002/mop.70243

Rui Wang, Futai Hu, Feng Yang, Zhendong Shi, Xing Fu, Qiang Liu

{"title":"High-Contrast Asymmetric Transmission Using the Transparent Conducting Oxides Thin Film Structure","authors":"Rui Wang, Futai Hu, Feng Yang, Zhendong Shi, Xing Fu, Qiang Liu","doi":"10.1002/mop.70243","DOIUrl":"https://doi.org/10.1002/mop.70243","url":null,"abstract":"<div>\u0000 \u0000 <p>All-optical signal processing based on nonlinear effect has emerged as a promising solution to overcome the limitations of electronic signal processing, particularly in terms of power consumption and operational speed. This study explores a dual-step nonlinear configuration in transparent conducting oxide (TCO) thin films, achieved through a dual-layer CdO structure with distinct doping concentrations. By utilizing layers with different plasma frequencies, we induce a nonlinear redshift in the epsilon-near-zero (ENZ) wavelength under sub-bandgap optical pumping, leading to significant directional absorption differences and enhanced transmission asymmetry. Our results show varying levels of asymmetric contrast: a single-layer CdO combined with a gold layer achieves the highest contrast ratio of 160 at 2.09 µm under p-polarized light, while dual-layer CdO structures exhibit contrast ratios of 42 and 23, respectively. This tunable and efficient asymmetric transmission underscores the potential of TCO-based thin films for advanced photonic devices in all-optical systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Multiobjective Optimization Design of Compact Filtering Patch Antenna With Generalized Filtering Slot 具有广义滤波槽的紧凑型滤波贴片天线多目标优化设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-21 DOI: 10.1002/mop.70248

Gongda Hu, Yuan He, Yun Ge, Gang Wang, Qingfu Zhang

{"title":"Multiobjective Optimization Design of Compact Filtering Patch Antenna With Generalized Filtering Slot","authors":"Gongda Hu, Yuan He, Yun Ge, Gang Wang, Qingfu Zhang","doi":"10.1002/mop.70248","DOIUrl":"https://doi.org/10.1002/mop.70248","url":null,"abstract":"<div>\u0000 \u0000 <p>This article proposes a novel technique for designing microstrip filtering patch antenna by etching the generalized filtering slot (GFS) on the patch. Surface current-controlled in-band multiple resonances and radiation nulls in both sidebands can be achieved relying only on the configuration of GFS without any parasitic or stacked structures outside of the radiation patch, which ensures the compact size and low profile. The GFS with two-part structure can be effectively characterized by the distributed contour nodes with distance parameters and L-shaped slot lines with controllable turning points, whose geometry is completely encoded by a binary design matrix. The compact patch antenna with wideband, high selectivity and high suppression level can be acquired by implementing multiobjective optimization search for the optimal nodes distribution including feed points, along with the optimal distance parameters and slot width for slot construction. For demonstration, a filtering antenna with square patch working at 3.5 GHz is designed and fabricated, showing a realized gain of 5.8 dBi, impedance bandwidth of 12.0%, and suppression over 20 dB with steep roll-off.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Passively Q-Switched Operation of a Tm:YAP Laser Based on V4C3Tx Saturable Absorber 基于V4C3Tx饱和吸收体的Tm:YAP激光器被动调q工作

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-21 DOI: 10.1002/mop.70250

Shuang Yu, Xudong Sun, Xining Yang

引用次数: 0

Dual-Band Narrow-Bandgap Filter Using Stub-Load Coaxial Resonator 采用短段负载同轴谐振器的双带窄带隙滤波器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-05-21 DOI: 10.1002/mop.70240

Xin Fang, Zhenghao Zuo, Zhentian Wu, Xiaoming Chen, Lixia Yang

引用次数: 0