Microwave and Optical Technology Letters最新文献

Compact Planar Antenna for Wireless Biotelemetry in Implantable Neurostimulation Devices 用于植入式神经刺激装置无线生物遥测的紧凑型平面天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-25 DOI: 10.1002/mop.70206

Kapil Gangwar, Manish Kumar Rauniyar, Som Pal Gangwar, Ravi Kumar Gangwar

{"title":"Compact Planar Antenna for Wireless Biotelemetry in Implantable Neurostimulation Devices","authors":"Kapil Gangwar, Manish Kumar Rauniyar, Som Pal Gangwar, Ravi Kumar Gangwar","doi":"10.1002/mop.70206","DOIUrl":"https://doi.org/10.1002/mop.70206","url":null,"abstract":"<div>\u0000 \u0000 <p>This article introduces a compact planar antenna for implantable neurostimulation devices that ensures efficient and reliable communication with handheld devices while minimizing battery drainage. The antenna design operates within the 2.4–2.48 GHz frequency range, suitable for the 2.45 GHz ISM band. A cubical shell, created using 3-D printing technology, was employed to evaluate the antenna's performance on pig tissue models. Reflection coefficient measurements and Specific Absorption Rate (SAR) analysis were conducted to assess safety and functionality. The newly designed antenna demonstrated an impedance bandwidth ranging from 2.2 GHz to 2.67 GHz when integrated into the device and positioned between pig tissues. The SAR analysis confirmed that the antenna adheres to safety standards for electromagnetic exposure. The antenna effectively maintains communication capabilities and meets safety standards when embedded within the human body, thus addressing key challenges in implantable device functionality due to antenna detuning. This study contributes significantly to the field of implantable biomedical devices, offering a viable solution to communication effectiveness while ensuring energy efficiency and safety compliance, thereby improving long-term device functionality.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871870","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 Near Field Polarization Reconfigurable Fully Metallic Metasurface With 3D Printed Pyramidal Horn Antenna for Millimeter-Wave Applications 近场极化可重构全金属超表面与3D打印锥体喇叭天线的毫米波应用

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI: 10.1002/mop.70203

Akhilesh Kumar, Amit K. Singh

引用次数: 0

A Wideband Dielectric Resonator Antenna With Four Dielectric Blocks for Generating Filtering Response 一种产生滤波响应的四介质块宽带介质谐振器天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI: 10.1002/mop.70214

Li Zhang, Anzhi Wang, Yuchen Luan, Linhong He, Yong-Chang Jiao

引用次数: 0

Inverse Design of an Ultra-Compact Symmetric 3-dB Optical Power Splitter Based on N-ary Digital Pattern 基于n进数模式的超紧凑对称3db光功率分配器的反设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI: 10.1002/mop.70202

Jin Wen, Shuangchao Qu, Yu Pan, Chengju Ma, Wei Fan, Ying Zhang, Lan Yin, Chenglong Wang, Hongsen Zhao, Dingkang Zhang, Yuening Jiang

{"title":"Inverse Design of an Ultra-Compact Symmetric 3-dB Optical Power Splitter Based on N-ary Digital Pattern","authors":"Jin Wen, Shuangchao Qu, Yu Pan, Chengju Ma, Wei Fan, Ying Zhang, Lan Yin, Chenglong Wang, Hongsen Zhao, Dingkang Zhang, Yuening Jiang","doi":"10.1002/mop.70202","DOIUrl":"https://doi.org/10.1002/mop.70202","url":null,"abstract":"<div>\u0000 \u0000 <p>Inverse design based on high-performance computing ability is an efficient and intuitive design method. In this paper, we employed the digitized adjoint method to design a symmetric 3-dB power splitter based on <i>N</i>-ary digital pattern with an occupied compact footprint of only 3.25 µm × 2.6 µm. The digitized adjoint method is applied to inverse design and continuously adjusts and updates the relative permittivity for a cylindrical material filled with the intermediate material to obtain a quasi-digital pattern and then transforms it into a quaternary digital pattern. Based on this approach, a symmetrical structure with etching cylindrical radius of 45, 37, and 30 nm was obtained, which enables the 3-dB power splitter to achieve a precise 50:50 split ratio in a wide wavelength range from 1.45 to 1.65 µm. And the excess loss (EL) was less than 1 dB with an operating bandwidth of 200 nm. This approach holds significant potential for informing the design of high-performance, compact power splitters.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861945","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

Wideband and High-Gain Folded Transmit-Array Antenna Based on 3-Bit FPTP Metasurface 基于3位FPTP超表面的宽带高增益折叠发射阵列天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI: 10.1002/mop.70205

Qiang Wang, Jun Zou, Yu Cheng Yang, Xiaomeng Cheng, Mingzhu Jiang, Jun Chen Ke, Lei Wang

{"title":"Wideband and High-Gain Folded Transmit-Array Antenna Based on 3-Bit FPTP Metasurface","authors":"Qiang Wang, Jun Zou, Yu Cheng Yang, Xiaomeng Cheng, Mingzhu Jiang, Jun Chen Ke, Lei Wang","doi":"10.1002/mop.70205","DOIUrl":"https://doi.org/10.1002/mop.70205","url":null,"abstract":"<div>\u0000 \u0000 <p>Metasurfaces provide an unprecedented capability for manipulating electromagnetic waves. In this study, a wideband and high-gain folded transmit-array antenna (FTA) based on a 3-bit Fabry–Perot transmission polarizer (FPTP) metasurface was proposed and realized. The proposed FTA comprises three key components: (1) top-layer FPTP metasurface, (2) bottom-layer miniaturized waveguide horn feed, and (3) reflector array. The FPTP metasurface adopts a sandwich structure, integrating two orthogonal metallic grids with an embedded 3-bit digitally encoded C-shaped ring, which simultaneously achieves polarization conversion and high-precision phase compensation while avoiding insertion losses caused by multilayer stacking. The feed employs a customized miniaturized waveguide horn, and the reflector incorporates a 90° polarization conversion function, effectively mitigating the impact of missing central elements in the primary reflector without requiring additional polarization layers. Through synergistic optimization of the FPTP metasurface, feed, and reflector, the system achieves high-gain and wideband performance while maintaining a low-profile geometry (thickness reduced to one-quarter of the focal length). A prototype with 45 × 45 unit cells was fabricated and tested, demonstrating an operational bandwidth of 11.3–17 GHz, a measured peak gain of 27.1 dBi, a 3-dB gain bandwidth of 36.4%, and an aperture efficiency of 38%, all of which align closely with simulations. The proposed 3-bit FPTP metasurface provides a novel solution for low-profile, high-gain antenna design and is expected to find potential applications in next-generation wireless communication systems.</p></div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861944","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 Mode-Composite Bandpass Filter and Diplexer With Flexible Transmission Zeros Control Based on Mixed Electro-Magnetic and Source-Load Coupling Mechanism 基于混合电磁和源负载耦合机制的紧凑模式复合带通滤波器和柔性传输零控制双工器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-23 DOI: 10.1002/mop.70204

Shuai Zhu, Xiang Wang, Hang Yang, Ke-Long Sheng, Huangyan Li, Boyu Sima, Zhi-Yuan Zong, Wen Wu

{"title":"Compact Mode-Composite Bandpass Filter and Diplexer With Flexible Transmission Zeros Control Based on Mixed Electro-Magnetic and Source-Load Coupling Mechanism","authors":"Shuai Zhu, Xiang Wang, Hang Yang, Ke-Long Sheng, Huangyan Li, Boyu Sima, Zhi-Yuan Zong, Wen Wu","doi":"10.1002/mop.70204","DOIUrl":"https://doi.org/10.1002/mop.70204","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a series of mode-composite bandpass filters (BPFs) and diplexer, which integrate both electro-magnetic (EM) and source-load (SL) coupling within the hybrid eighth-mode substrate-integrated waveguide (EMSIW) and microstrip line (MSL) resonators. The mixed EM coupling can achieve a distinct distribution of transmission zeros (TZs), and SL coupling can further enhance the selectivity near the operating passband. Case I presents a mode-composite BPF operating at 3.5 GHz. The proposed BPF employs SL coupling and EM coupling, with electric coupling (EC) being predominant. Consequently, this configuration yields three TZs adjacent to the passband: one to the left and two to the right. Case II presents a similar BPF design operating at 5.6 GHz, but with magnetic coupling (MC) dominating the mixed EM coupling. This configuration also results in three TZs near the passband: one to the right and two to the left. To demonstrate and validate the novel property, both types of mode-composite BPFs and the relevant diplexer have been designed, fabricated, and measured. The simulation and measurement have reached to a satisfactory agreement.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861942","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

Wideband Filter With Controllable Notched Band Based on Fan-Shaped SIW and Spoof Surface Plasmon Polaritons 基于扇形SIW和欺骗表面等离子激元极化的可控缺口带宽带滤波器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-21 DOI: 10.1002/mop.70135

Quan-Long Wen, Yu-Li Xin, Zhi-Qiang Yang, Han-Yu Xie, Yang Qiu

{"title":"Wideband Filter With Controllable Notched Band Based on Fan-Shaped SIW and Spoof Surface Plasmon Polaritons","authors":"Quan-Long Wen, Yu-Li Xin, Zhi-Qiang Yang, Han-Yu Xie, Yang Qiu","doi":"10.1002/mop.70135","DOIUrl":"https://doi.org/10.1002/mop.70135","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, we propose a broadband bandpass filter featuring controllable notch bands and a wide stopband, utilizing fan-shaped substrate integrated waveguide (FSSIW) and spoof surface plasmon polaritons (SSPPs). Rectangular slots arranged in a quasiperiodic pattern are carved into the central part of the upper metal of the FSSIW structure to support SSPPs mode. The dispersion curve of the quasiperiodic FSSIW-SSPPs unit structure is analyzed, which demonstrates that the quasiperiodic FSSIW-SSPPs unit structure is suitable for developing wideband bandpass filter. By modifying the geometric characteristics of the FSSIW and SSPPs structures, the lower and upper cutoff frequencies of the bandpass filter based on the Quasiperiodic FSSIW-SSPPs unit can be controlled independently. Utilizing the wideband bandpass filter as a foundation, coupling U-shaped resonators at the input and output terminals of the filter generates a notched band in the passband. The novel developed a wideband bandpass filter featuring a frequency notch that exhibits measured passbands spanning from 7.640 to 9.183 GHz and from 9.343 to 10.503 GHz. This filter with a notched band offers the benefits of compact lateral dimensions and a broad stopband.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856768","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 Endfire Phased Array Antenna for 5G mm-Wave Mobile Terminals 5G毫米波移动终端用紧凑型双频端射相控阵天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-21 DOI: 10.1002/mop.70201

Huidong Xu, Changjiang Deng, Zhewei Fu, Rongrong Dong

引用次数: 0

Narrow Pulse Width Green Laser Based on LED-Pumped Electro-Optically Q-Switched Nd:YAG Laser 基于led泵浦电光调q Nd:YAG激光器的窄脉宽绿色激光器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-21 DOI: 10.1002/mop.70207

Rongrong Jiang, Yang Chen, Shaocong Xu, Peng Lu, Jianping Shen, Linghai Xie

引用次数: 0

Pattern-Reconfigurable Metal-Bezel Smartwatch GPS Antenna for Enhanced Positioning Performance 模式可重构金属表圈智能手表GPS天线增强定位性能

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-17 DOI: 10.1002/mop.70197

Hui Li, Wenrui Zheng, Yonghua Kong, Guo-Lin Liu

{"title":"Pattern-Reconfigurable Metal-Bezel Smartwatch GPS Antenna for Enhanced Positioning Performance","authors":"Hui Li, Wenrui Zheng, Yonghua Kong, Guo-Lin Liu","doi":"10.1002/mop.70197","DOIUrl":"https://doi.org/10.1002/mop.70197","url":null,"abstract":"<div>\u0000 \u0000 <p>Steering the radiation pattern to the desired direction is highly anticipated for smartwatch GPS antenna in user scenarios, as it prevents energy from being wasted in unnecessary directions. In this paper, a dual-pattern reconfigurable metal-bezel smartwatch GPS antenna is proposed, which is capable of concentrating radiation energy according to different wearing preferences. The smartwatch consists of a metal bezel and a ground plane. An <i>L-</i>shaped branch is introduced, enabling current coupling into the clearance. With only two switches, opposite localized current paths can be achieved within the clearance, contributing to different radiation patterns. As a result, the antennas' peak gains of −0.70 dBi and −0.84 dBi are achieved at 1.575 GHz, respectively, which are suitable for left-wrist and right-wrist wearing scenarios. Antenna prototypes were fabricated, with the measured results agreeing well with the simulated ones. The <i>L</i>-shaped branch can be realized by laser direct structuring (LDS). The simple and practical implementation offers a feasible solution for enhancing the performance of smartwatch GPS antenna.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840932","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