Pub Date : 2025-12-30DOI: 10.1016/j.aeue.2025.156183
Xingming Fan, Yihao Chen, Xin Zhang
This study addresses the low efficiency and instability of magnetically coupled resonant wireless power transfer (MCR-WPT) systems caused by inter-coil coupling variations at low frequencies. We propose an approach using differentially compensated low-frequency electromagnetic metamaterials. Unlike conventional research that ignores the coupling effects between metamaterial elements, this paper first establishes an equivalent circuit model that incorporates the mutual inductance coupling between adjacent elements, revealing the underlying mechanism by which inter-element coupling causes the overall resonant frequency shift of the array. Furthermore, a differentiated compensation capacitor design strategy is proposed. By assigning different lumped capacitors to elements at different positions in the array, this effectively compensates for the variations in equivalent inductance caused by these coupling differences, thereby stabilizing the array resonant frequency at the target frequency of 85 kHz. Finite element simulations demonstrate that the composite metamaterial array achieves a relative permeability near −1 at the target frequency and significantly optimizes the system's magnetic field distribution. Experimental results demonstrate that, over a transmission distance of 5 to 25 cm, the introduction of this composite metamaterial improves the system's transmission efficiency from 19.8%–49.3% to 40.1%–73.9%. Moreover, even under lateral displacement of the receiving coil, the system retains high efficiency, highlighting its improved robustness against misalignment.
{"title":"Design and application of differentiated compensation metamaterials for wireless power transfer system","authors":"Xingming Fan, Yihao Chen, Xin Zhang","doi":"10.1016/j.aeue.2025.156183","DOIUrl":"10.1016/j.aeue.2025.156183","url":null,"abstract":"<div><div>This study addresses the low efficiency and instability of magnetically coupled resonant wireless power transfer (MCR-WPT) systems caused by inter-coil coupling variations at low frequencies. We propose an approach using differentially compensated low-frequency electromagnetic metamaterials. Unlike conventional research that ignores the coupling effects between metamaterial elements, this paper first establishes an equivalent circuit model that incorporates the mutual inductance coupling between adjacent elements, revealing the underlying mechanism by which inter-element coupling causes the overall resonant frequency shift of the array. Furthermore, a differentiated compensation capacitor design strategy is proposed. By assigning different lumped capacitors to elements at different positions in the array, this effectively compensates for the variations in equivalent inductance caused by these coupling differences, thereby stabilizing the array resonant frequency at the target frequency of 85 kHz. Finite element simulations demonstrate that the composite metamaterial array achieves a relative permeability near −1 at the target frequency and significantly optimizes the system's magnetic field distribution. Experimental results demonstrate that, over a transmission distance of 5 to 25 cm, the introduction of this composite metamaterial improves the system's transmission efficiency from 19.8%–49.3% to 40.1%–73.9%. Moreover, even under lateral displacement of the receiving coil, the system retains high efficiency, highlighting its improved robustness against misalignment.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156183"},"PeriodicalIF":3.2,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.aeue.2025.156185
Lunde Ardhenta , Ichijo Hodaka , Takuya Hirata
The coupling coefficient as well as the operating frequency increases or decreases the load power in a wireless power transfer system. The parameter space of coupling coefficient and operating frequency is divided into over-, critically-, and under-coupled regions. The load power at over- and under- coupled regions drops from the critically-coupled region where the power is ideally maximized. This situation for series–series topology has been clarified in the conventional studies. In this paper, the critically-coupled region or critical coupling coefficient for series-parallel and parallel-series topologies is revealed in a mathematically form. The results of this paper suggest a selection of topology to improve load power over longer distance in wireless power transfer.
{"title":"Increasing transfer gap while maximizing load power by selecting topologies in wireless power transfer system","authors":"Lunde Ardhenta , Ichijo Hodaka , Takuya Hirata","doi":"10.1016/j.aeue.2025.156185","DOIUrl":"10.1016/j.aeue.2025.156185","url":null,"abstract":"<div><div>The coupling coefficient as well as the operating frequency increases or decreases the load power in a wireless power transfer system. The parameter space of coupling coefficient and operating frequency is divided into over-, critically-, and under-coupled regions. The load power at over- and under- coupled regions drops from the critically-coupled region where the power is ideally maximized. This situation for series–series topology has been clarified in the conventional studies. In this paper, the critically-coupled region or critical coupling coefficient for series-parallel and parallel-series topologies is revealed in a mathematically form. The results of this paper suggest a selection of topology to improve load power over longer distance in wireless power transfer.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156185"},"PeriodicalIF":3.2,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.aeue.2025.156191
Baoping Ren , Pingping Zhang , Shengli Long , Junhui Qin , Wenlong Zhang , Jun Li , Xuehui Guan
In this paper, a new dual-band filter based on effective surface plasmon polaritons (ESPPs) and spoof surface plasmon polaritons (SSPPs) is designed. Firstly, a two-layer half-mode substrate integrated waveguide (HMSIW) with half size of SIW is proposed to excite an ESPPs mode, which is used to constitute the lower passband of the dual-band filter. Subsequently, periodic grooves are etched on the top metal layer of the ESPPs waveguide to introduce SSPPs, which facilitates the generation of the upper passband. In contrast to the manner of accomplishing dual-band filtering response by harnessing two ESPPs modes propagating at different interfaces, the design method proposed in this paper allows for simplification of the configuration. Moreover, a high degree of independence is demonstrated in the manipulation of the two passbands. Ultimately, a filter with two passbands centered at 2.18 GHz and 3.43 GHz, and corresponding fractional bandwidth of 13.8% and 37.7% is designed. With the simulated maximum insertion loss of 1.3 dB and return loss better than 10.9 dB within two passbands, the filter possesses good transmission performance. In addition, the rejection level of the stopband between two passbands reaches up to −39 dB, exhibiting favorable isolation. For demonstration, a prototype of the dual-band filter is fabricated and measured. The measured results agree well with the simulations, validating the design method and structure.
{"title":"A bandwidth controllable dual-band filter integrating effective surface plasmon polaritons and spoof surface plasmon polaritons","authors":"Baoping Ren , Pingping Zhang , Shengli Long , Junhui Qin , Wenlong Zhang , Jun Li , Xuehui Guan","doi":"10.1016/j.aeue.2025.156191","DOIUrl":"10.1016/j.aeue.2025.156191","url":null,"abstract":"<div><div>In this paper, a new dual-band filter based on effective surface plasmon polaritons (ESPPs) and spoof surface plasmon polaritons (SSPPs) is designed. Firstly, a two-layer half-mode substrate integrated waveguide (HMSIW) with half size of SIW is proposed to excite an ESPPs mode, which is used to constitute the lower passband of the dual-band filter. Subsequently, periodic grooves are etched on the top metal layer of the ESPPs waveguide to introduce SSPPs, which facilitates the generation of the upper passband. In contrast to the manner of accomplishing dual-band filtering response by harnessing two ESPPs modes propagating at different interfaces, the design method proposed in this paper allows for simplification of the configuration. Moreover, a high degree of independence is demonstrated in the manipulation of the two passbands. Ultimately, a filter with two passbands centered at 2.18 GHz and 3.43 GHz, and corresponding fractional bandwidth of 13.8% and 37.7% is designed. With the simulated maximum insertion loss of 1.3 dB and return loss better than 10.9 dB within two passbands, the filter possesses good transmission performance. In addition, the rejection level of the stopband between two passbands reaches up to −39 dB, exhibiting favorable isolation. For demonstration, a prototype of the dual-band filter is fabricated and measured. The measured results agree well with the simulations, validating the design method and structure.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156191"},"PeriodicalIF":3.2,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-27DOI: 10.1016/j.aeue.2025.156178
Farha K. A. , Jasmine P. M. , Fasmi K. A.
The 6.425 GHz to 8.4 GHz frequency band is gaining recognition as a core spectrum for 6G, offering a strong balance between coverage, capacity, and deployment efficiency. As part of the ultra-wideband (UWB) spectrum, this band delivers expansive bandwidth and robust short-range communication, making it ideal for next-generation applications. This paper presents the design, analysis, and implementation of edge-fed dual band rectangular microstrip patch antenna with improved impedance bandwidth through slot-based defected ground structure for 6G applications. The antenna is designed on a substrate of FR4, which has a dielectric constant of 4.4. The measurement result shows that the proposed antenna operates efficiently from 3.31 GHz to 10.53 GHz. The antenna achieves an excellent Voltage Standing Wave Ratio less than 2 over the operational band, indicating perfect impedance matching and minimal signal reflection. This study integrates a machine-learning-assisted framework for bandwidth prediction with SHAP-based explainable AI analysis to identify the most influential design parameters, providing valuable physical insights for performance optimization. It provides a faster and more efficient alternative to repeated full-wave simulations. The combined Electromagnetic–Machine Learning approach enhances both accuracy and explainability, contributing a novel and efficient methodology for antenna design in 6G communication systems.
{"title":"Design, implementation, and explainable AI evaluation of a compact UWB microstrip patch antenna for 6G applications","authors":"Farha K. A. , Jasmine P. M. , Fasmi K. A.","doi":"10.1016/j.aeue.2025.156178","DOIUrl":"10.1016/j.aeue.2025.156178","url":null,"abstract":"<div><div>The 6.425 GHz to 8.4 GHz frequency band is gaining recognition as a core spectrum for 6G, offering a strong balance between coverage, capacity, and deployment efficiency. As part of the ultra-wideband (UWB) spectrum, this band delivers expansive bandwidth and robust short-range communication, making it ideal for next-generation applications. This paper presents the design, analysis, and implementation of edge-fed dual band rectangular microstrip patch antenna with improved impedance bandwidth through slot-based defected ground structure for 6G applications. The antenna is designed on a substrate of FR4, which has a dielectric constant of 4.4. The measurement result shows that the proposed antenna operates efficiently from 3.31 GHz to 10.53 GHz. The antenna achieves an excellent Voltage Standing Wave Ratio less than 2 over the operational band, indicating perfect impedance matching and minimal signal reflection. This study integrates a machine-learning-assisted framework for bandwidth prediction with SHAP-based explainable AI analysis to identify the most influential design parameters, providing valuable physical insights for performance optimization. It provides a faster and more efficient alternative to repeated full-wave simulations. The combined Electromagnetic–Machine Learning approach enhances both accuracy and explainability, contributing a novel and efficient methodology for antenna design in 6G communication systems.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156178"},"PeriodicalIF":3.2,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-23DOI: 10.1016/j.aeue.2025.156189
Zhang Wen Cheng , Meng Wang , Qian Yao , Zong Ling Zhong , Jia Wei Wang , Sen Zheng , Hui Feng Ma
This paper proposes a mode-modulated leaky-wave antenna (LWA) based on spoof surface plasmon polaritons (SSPPs), featuring spatial high-efficiency right-handed circularly polarized (RHCP) and left-handed circularly polarized (LHCP) radiation in different azimuth directions simultaneously. The LWA consists of the grooved SSPP units loaded with 45°-tilted branch and some same complementary structures etched on the metal ground, where the top-layer SSPP units adopt a symmetric grooved design to improve circular polarization purity. The application of mode modulation theory significantly enhances leaky-wave radiation, enabling the proposed LWA to achieve extremely high radiation efficiency. Simulation and experimental results show that the proposed LWA achieves frequency beam-scanning RHCP radiation from 1° to 33° and LHCP radiation from 179° to 147° with high radiation efficiency of over 97 %.
{"title":"High-efficiency and dual-circularly polarized leaky-wave antenna based on mode-modulated spoof surface plasmon polaritons","authors":"Zhang Wen Cheng , Meng Wang , Qian Yao , Zong Ling Zhong , Jia Wei Wang , Sen Zheng , Hui Feng Ma","doi":"10.1016/j.aeue.2025.156189","DOIUrl":"10.1016/j.aeue.2025.156189","url":null,"abstract":"<div><div>This paper proposes a mode-modulated leaky-wave antenna (LWA) based on spoof surface plasmon polaritons (SSPPs), featuring spatial high-efficiency right-handed circularly polarized (RHCP) and left-handed circularly polarized (LHCP) radiation in different azimuth directions simultaneously. The LWA consists of the grooved SSPP units loaded with 45°-tilted branch and some same complementary structures etched on the metal ground, where the top-layer SSPP units adopt a symmetric grooved design to improve circular polarization purity. The application of mode modulation theory significantly enhances leaky-wave radiation, enabling the proposed LWA to achieve extremely high radiation efficiency. Simulation and experimental results show that the proposed LWA achieves frequency beam-scanning RHCP radiation from 1° to 33° and LHCP radiation from 179° to 147° with high radiation efficiency of over 97 %.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156189"},"PeriodicalIF":3.2,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-23DOI: 10.1016/j.aeue.2025.156188
Mert Ciflik, S. Cumhur Basaran
The effective relative permittivity (εeff) of planar capsule antennas differs significantly from that of antennas implanted directly into biological tissue. However, this distinction has been largely overlooked in most planar capsule antenna designs reported in the recent literature for implantable medical devices (IMDs), where it is commonly assumed that antenna performance in direct tissue implantation is equally valid within a capsule environment. In this article, the εeff of a microstrip antenna is first calculated using an efficient analytical model for both implantation scenarios. Based on these insights, a dual-band planar capsule antenna with a novel configuration is proposed for implantable and ingestible applications, carefully designed with consideration of the effective relative permittivity to ensure robust performance. The proposed antenna features a compact footprint of 14 mm × 14 mm × 0.634 mm3 and operates in both the 402 MHz MICS and 2.4 GHz ISM bands. The miniaturized dual-band antenna configuration is achieved by combining an efficient radiator, a shorting pin, and a slotted ground plane. A prototype of the proposed antenna, whose numerical design and analysis were conducted on both homogeneous muscle tissue and realistic human models, was encapsulated, and its performance was measured using minced meat.
平面胶囊天线的有效相对介电常数(εeff)与直接植入生物组织的天线有显著差异。然而,在最近的植入式医疗器械(imd)文献中报道的大多数平面胶囊天线设计中,这一区别在很大程度上被忽视了,在这些设计中,通常认为直接组织植入的天线性能在胶囊环境中同样有效。本文首先用一种有效的解析模型计算了两种植入情况下微带天线的εeff。基于这些见解,提出了一种具有新颖结构的双频平面胶囊天线,用于植入和可摄取的应用,精心设计时考虑了有效的相对介电常数,以确保稳健的性能。该天线占地面积为14 mm × 14 mm × 0.634 mm3,可在402 MHz MICS和2.4 GHz ISM频段工作。小型化的双频天线配置是通过结合一个高效的散热器、一个短引脚和一个开槽的接平面来实现的。设计了该天线的原型,在均匀肌肉组织和真实人体模型上进行了数值设计和分析,并使用肉末对其性能进行了测量。
{"title":"Design of a dual-band capsule antenna based on effective relative permittivity for realistic implantable medical devices","authors":"Mert Ciflik, S. Cumhur Basaran","doi":"10.1016/j.aeue.2025.156188","DOIUrl":"10.1016/j.aeue.2025.156188","url":null,"abstract":"<div><div>The effective relative permittivity (<em>ε</em><sub><em>eff</em></sub>) of planar capsule antennas differs significantly from that of antennas implanted directly into biological tissue. However, this distinction has been largely overlooked in most planar capsule antenna designs reported in the recent literature for implantable medical devices (IMDs), where it is commonly assumed that antenna performance in direct tissue implantation is equally valid within a capsule environment. In this article, the <em>ε</em><sub><em>eff</em></sub> of a microstrip antenna is first calculated using an efficient analytical model for both implantation scenarios. Based on these insights, a dual-band planar capsule antenna with a novel configuration is proposed for implantable and ingestible applications, carefully designed with consideration of the effective relative permittivity to ensure robust performance. The proposed antenna features a compact footprint of 14 mm × 14 mm × 0.634 mm<sup>3</sup> and operates in both the 402 MHz MICS and 2.4 GHz ISM bands. The miniaturized dual-band antenna configuration is achieved by combining an efficient radiator, a shorting pin, and a slotted ground plane. A prototype of the proposed antenna, whose numerical design and analysis were conducted on both homogeneous muscle tissue and realistic human models, was encapsulated, and its performance was measured using minced meat.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156188"},"PeriodicalIF":3.2,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The growing demand for secure, real-time signal transmission in applications such as IoT, communication systems, and multimedia necessitates low-latency cryptographic solutions. FPGAs are well-suited for this task due to their parallelism and high-throughput capabilities. However, conventional development using hardware description languages (HDLs) can be time-consuming, especially when debugging complex systems. To address these limitations, this work introduces an OpenCL-based framework for implementing real-time AES-128 encryption and decryption on FPGA platforms. The proposed method leverages hardware acceleration and high-level synthesis (HLS) to significantly reduce development time while sustaining high computational performance. A custom analog-to-digital converter (ADC) module based on the Avalon Streaming interface was developed to facilitate continuous data acquisition and real-time signal encryption through OpenCL I/O streaming channels. The system was implemented on an Intel Cyclone V FPGA, interfaced with a dual-channel, 14-bit ADC operating at 100 MHz. Experimental results show that the optimized AES-128 encryption pipeline achieved 98% of its theoretical maximum throughput (3.15 Gbps) when processing streamed ADC input, while the decryption process reached 98% of its peak throughput (9.6 Gbps) when using DDR memory.
物联网、通信系统和多媒体等应用对安全、实时信号传输的需求不断增长,需要低延迟的加密解决方案。fpga由于其并行性和高吞吐量能力而非常适合此任务。然而,使用硬件描述语言(hdl)的传统开发可能非常耗时,特别是在调试复杂系统时。为了解决这些限制,本工作引入了一个基于opencl的框架,用于在FPGA平台上实现实时AES-128加密和解密。所提出的方法利用硬件加速和高级合成(HLS)来显著缩短开发时间,同时保持高计算性能。开发了基于Avalon流接口的定制模数转换器(ADC)模块,通过OpenCL I/O流通道实现连续数据采集和实时信号加密。该系统在Intel Cyclone V FPGA上实现,接口是一个工作频率为100 MHz的双通道14位ADC。实验结果表明,优化后的AES-128加密管道在处理流式ADC输入时达到理论最大吞吐量(3.15 Gbps)的98%,而在使用DDR内存时,解密过程达到其峰值吞吐量(9.6 Gbps)的98%。
{"title":"OpenCL-accelerated FPGA for real-time AES-128 signal encryption and decryption","authors":"Iman Firmansyah , Bambang Setiadi , Suyoto Suyoto , Salita Ulitia Prini , Ratna Indrawijaya , Budiman P.A. Rohman , Yoshiki Yamaguchi","doi":"10.1016/j.aeue.2025.156187","DOIUrl":"10.1016/j.aeue.2025.156187","url":null,"abstract":"<div><div>The growing demand for secure, real-time signal transmission in applications such as IoT, communication systems, and multimedia necessitates low-latency cryptographic solutions. FPGAs are well-suited for this task due to their parallelism and high-throughput capabilities. However, conventional development using hardware description languages (HDLs) can be time-consuming, especially when debugging complex systems. To address these limitations, this work introduces an OpenCL-based framework for implementing real-time AES-128 encryption and decryption on FPGA platforms. The proposed method leverages hardware acceleration and high-level synthesis (HLS) to significantly reduce development time while sustaining high computational performance. A custom analog-to-digital converter (ADC) module based on the Avalon Streaming interface was developed to facilitate continuous data acquisition and real-time signal encryption through OpenCL I/O streaming channels. The system was implemented on an Intel Cyclone V FPGA, interfaced with a dual-channel, 14-bit ADC operating at 100 MHz. Experimental results show that the optimized AES-128 encryption pipeline achieved 98% of its theoretical maximum throughput (3.15 Gbps) when processing streamed ADC input, while the decryption process reached 98% of its peak throughput (9.6 Gbps) when using DDR memory.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156187"},"PeriodicalIF":3.2,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-22DOI: 10.1016/j.aeue.2025.156181
Chen Wang, Jian Liu, Ang Li, Di Luo, Rui Wang, Kang Zeng
This paper presents a CMOS rectifier with wide power dynamic range (PDR) and high-sensitivity for RF energy harvesting. It is developed based on the conventional cross-coupled differentially-driven (CCDD) topology. In this rectifier, a voltage divider is introduced to provide the gate voltage for the bias circuit and to clamp the output voltage. This divider exists between output dc voltage () and the ground reference (). This bias circuit can be used to set the gate voltage of the rectifying MOSFETs. The proposed bias circuit can be employed to enhance the NMOS transistors’ gate voltage and reduce that of the PMOS transistors. This mechanism serves to extend the rectifier’s PDR. For validation, this rectifier is designed and simulated in a 40-nm CMOS process in Cadence software. The post-simulation results show that the proposed rectifier achieves a 87% peak power conversion efficiency (PCE) with a -18.9 dBm input power (), a 33.8 dB PDR (from -38.8 dBm to -5 dBm) for PCE 20% and a -19.4 dBm sensitivity with a 1-V output voltage.
{"title":"A high-sensitivity CMOS rectifier with wide input power range for ambient RF energy harvesting","authors":"Chen Wang, Jian Liu, Ang Li, Di Luo, Rui Wang, Kang Zeng","doi":"10.1016/j.aeue.2025.156181","DOIUrl":"10.1016/j.aeue.2025.156181","url":null,"abstract":"<div><div>This paper presents a CMOS rectifier with wide power dynamic range (PDR) and high-sensitivity for RF energy harvesting. It is developed based on the conventional cross-coupled differentially-driven (CCDD) topology. In this rectifier, a voltage divider is introduced to provide the gate voltage for the bias circuit and to clamp the output voltage. This divider exists between output dc voltage (<span><math><msub><mrow><mi>V</mi></mrow><mrow><mtext>OUT</mtext></mrow></msub></math></span>) and the ground reference (<span><math><msub><mrow><mi>V</mi></mrow><mrow><mtext>SS</mtext></mrow></msub></math></span>). This bias circuit can be used to set the gate voltage of the rectifying MOSFETs. The proposed bias circuit can be employed to enhance the NMOS transistors’ gate voltage and reduce that of the PMOS transistors. This mechanism serves to extend the rectifier’s PDR. For validation, this rectifier is designed and simulated in a 40-nm CMOS process in Cadence software. The post-simulation results show that the proposed rectifier achieves a 87% peak power conversion efficiency (PCE) with a -18.9<!--> <!-->dBm input power (<span><math><msub><mrow><mi>P</mi></mrow><mrow><mtext>in</mtext></mrow></msub></math></span>), a 33.8<!--> <!-->dB PDR (from -38.8<!--> <!-->dBm to -5<!--> <!-->dBm) for PCE <span><math><mo>></mo></math></span> 20% and a -19.4<!--> <!-->dBm sensitivity with a 1-V output voltage.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156181"},"PeriodicalIF":3.2,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study proposes an independent and asymmetric coupling structure for an integrated dual-band bandpass filter (BPF) with microwave microfluidic sensor. The proposed device features a three-port configuration where the dual-band BPF structure employs a coupled stepped impedance resonator (SIR), while the MS utilizes an interdigital capacitor (IDC) bridge structure located at the center of the ring resonator. The proposed structure was fabricated on a Rogers RT/Duroid 5880 substrate with εr = 2.2 and tan δ = 0.0009. Liquid samples, including a milk-water mixture and a milk-glucose mixture, were used for testing, each with a volume of 21.2 μL. Results demonstrate that the device provides dual-band BPF functionality with center frequencies of 2.16 GHz and 2.54 GHz, insertion losses (|S21|) of −1.30 dB and − 1.20 dB, and fractional bandwidths (FBWs) of 2.13 % and 3.34 %, respectively. For the MS application, the device achieved a frequency shift (Δf) of 32.0 MHz and a normalized sensitivity (NS) of 0.064 % for the milk-water mixture. Additionally, for the milk-glucose mixture, the MS exhibited sensitivities of 3.75 × 10−3 dB/(mg/dL) and 5.00 kHz/(mg/dL) based on the magnitude and peak location of the transmission coefficient, respectively. The device also exhibited an isolation value (|S₃₂|) of less than −25 dB, indicating minimal interference between the dual-band BPF and the MS. This high isolation enables both components to operate independently. Finally, the proposed device structure holds potential for future applications such as supporting food safety while also offering radio frequency filtering functionalities.
{"title":"Independent and asymmetric coupling structure for integrated dual-band bandpass filter with microwave microfluidic milk sensor","authors":"Teguh Firmansyah , Supriyanto Praptodiyono , Imamul Muttakin , Irma Saraswati , Adi Nugraha , Syah Alam , Habib Nurseha Anggradinata , Ken Paramayudha , Yuyu Wahyu , Teguh Handoyo , Aloysius Adya Pramudita , Gunawan Wibisono , Mudrik Alaydrus , Muhammad Iqbal , Nugraha","doi":"10.1016/j.aeue.2025.156186","DOIUrl":"10.1016/j.aeue.2025.156186","url":null,"abstract":"<div><div>This study proposes an independent and asymmetric coupling structure for an integrated dual-band bandpass filter (BPF) with microwave microfluidic sensor. The proposed device features a three-port configuration where the dual-band BPF structure employs a coupled stepped impedance resonator (SIR), while the MS utilizes an interdigital capacitor (IDC) bridge structure located at the center of the ring resonator. The proposed structure was fabricated on a Rogers RT/Duroid 5880 substrate with εr = 2.2 and tan δ = 0.0009. Liquid samples, including a milk-water mixture and a milk-glucose mixture, were used for testing, each with a volume of 21.2 μL. Results demonstrate that the device provides dual-band BPF functionality with center frequencies of 2.16 GHz and 2.54 GHz, insertion losses (|S<sub>21</sub>|) of −1.30 dB and − 1.20 dB, and fractional bandwidths (FBWs) of 2.13 % and 3.34 %, respectively. For the MS application, the device achieved a frequency shift (Δf) of 32.0 MHz and a normalized sensitivity (NS) of 0.064 % for the milk-water mixture. Additionally, for the milk-glucose mixture, the MS exhibited sensitivities of 3.75 × 10<sup>−3</sup> dB/(mg/dL) and 5.00 kHz/(mg/dL) based on the magnitude and peak location of the transmission coefficient, respectively. The device also exhibited an isolation value (|S₃₂|) of less than −25 dB, indicating minimal interference between the dual-band BPF and the MS. This high isolation enables both components to operate independently. Finally, the proposed device structure holds potential for future applications such as supporting food safety while also offering radio frequency filtering functionalities.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156186"},"PeriodicalIF":3.2,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The presented paper focuses on Neural Network (NN) based quad-port Multiple Input Multiple Output (MIMO) antenna development and analysis for 2.4/5 GHz WLAN, sub-6 GHz, and C-band communications. The engineered design exhibits the reflection coefficient values below-10 dB from 2.20 GHz to 11.70 GHz frequencies. The limited ground is proposed to attain the UWB response. The radiators are located orthogonally to each other at a minimum distance of half of the wavelength to minimize the mutual coupling effect. The flame-retardant material has been utilized to act as a substrate material with a dielectric constant is 4.3. The isolation geometry was developed and integrated with the ground structure to further improve the isolation. The conventional response has been generated using HFSS software. The proposed structure exhibits a gain of about 2 dBi, and efficiency is about 85 % to 90 %. The neural network has been trained, and the sets of data are given as input parameters to the NN. The NN predicted response was in line with the software-generated response. The values of diversity parameters, such as Channel Capacity Loss (CCL) is 0.001 bits/s/Hz, Envelop Correlation Coefficient(ECC) is 0.001 abs, Mean Effective Gain (MEG) is between −4 dB to −6 dB, and Diversity Gain (DG) is around 10 dB, were received. This work supports SDG 9 (Industry, Innovation and Infrastructure) by advancing AI-assisted wireless communication design and SDG 11 (Sustainable Cities and Communities) through improved reliability of WLAN and Sub-6 GHz systems.
{"title":"Neural network-assisted quad-port UWB MIMO antenna with enhanced isolation for WLAN and Sub-6 GHz wireless applications","authors":"Killol Pandya , Tigmanshu Patel , Aneri Pandya , Trushit Upadhyaya , Upesh Patel , Om Prakash Kumar","doi":"10.1016/j.aeue.2025.156184","DOIUrl":"10.1016/j.aeue.2025.156184","url":null,"abstract":"<div><div>The presented paper focuses on Neural Network (NN) based quad-port Multiple Input Multiple Output (MIMO) antenna development and analysis for 2.4/5 GHz WLAN, sub-6 GHz, and C-band communications. The engineered design exhibits the reflection coefficient values below-10 dB from 2.20 GHz to 11.70 GHz frequencies. The limited ground is proposed to attain the UWB response. The radiators are located orthogonally to each other at a minimum distance of half of the wavelength to minimize the mutual coupling effect. The flame-retardant material has been utilized to act as a substrate material with a dielectric constant is 4.3. The isolation geometry was developed and integrated with the ground structure to further improve the isolation. The conventional response has been generated using HFSS software. The proposed structure exhibits a gain of about 2 dBi, and efficiency is about 85 % to 90 %. The neural network has been trained, and the sets of data are given as input parameters to the NN. The NN predicted response was in line with the software-generated response. The values of diversity parameters, such as Channel Capacity Loss (CCL) is 0.001 bits/s/Hz, Envelop Correlation Coefficient(ECC) is 0.001 abs, Mean Effective Gain (MEG) is between −4 dB to −6 dB, and Diversity Gain (DG) is around 10 dB, were received. This work supports SDG 9 (Industry, Innovation and Infrastructure) by advancing AI-assisted wireless communication design and SDG 11 (Sustainable Cities and Communities) through improved reliability of WLAN and Sub-6 GHz systems.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"206 ","pages":"Article 156184"},"PeriodicalIF":3.2,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145885915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}