Aeu-International Journal of Electronics and Communications最新文献_第5页

Exhibiting the superiority of metal-filled SSPP in advanced output matching networks for high-performance power amplifier 展示了金属填充SSPP在高性能功率放大器先进输出匹配网络中的优越性

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-28 DOI: 10.1016/j.aeue.2025.156016

Hemant Kumari, Amartya Paul, Wanchi Sangma, Shubhankar Majumdar

{"title":"Exhibiting the superiority of metal-filled SSPP in advanced output matching networks for high-performance power amplifier","authors":"Hemant Kumari, Amartya Paul, Wanchi Sangma, Shubhankar Majumdar","doi":"10.1016/j.aeue.2025.156016","DOIUrl":"10.1016/j.aeue.2025.156016","url":null,"abstract":"<div><div>This paper presents the design and optimization of a high-efficiency power amplifier (PA) utilizing spoof surface plasmon polaritons (SSPPs) at 2.4 GHz for enhanced impedance matching in microwave applications. Surface plasmon polaritons (SPPs), arising from the interaction between electromagnetic waves and free electrons at the metal–dielectric interface, are emulated in the microwave domain using SSPPs. These structures enable strong field confinement, compactness, and improved signal integrity. However, efficient amplification of high-power plasmonic signals in a reduced footprint remains a key challenge. To address this, Gallium Nitride (GaN) HEMT technology is employed. Three SSPP lines are integrated into the output matching network (OMN), where structural modifications: air-filled and metal-filled apertures, are introduced. Comparative measurements indicate that the classical PA achieved 38.99 dBm output power, 13 dB gain, 53.7% efficiency, -68 dBc adjacent channel power ratio (ACPR), and 25.5 dBc <span><math><mrow><mi>C</mi><mo>/</mo><mi>I</mi></mrow></math></span>. Incorporating air-filled apertures led to 7.14% and 4.26% improvements in output power and efficiency, respectively. Metal-filled apertures further enhanced output power by 13.71% and efficiency by 13.83%, while improving ACPR and carrier-to-interference ratio (<span><math><mrow><mi>C</mi><mo>/</mo><mi>I</mi></mrow></math></span>) by 5.88% and 17.65%, respectively. These results confirm the utility of SSPP-based OMNs in scalable, high-performance GaN-based PAs for compact wireless front-ends.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 156016"},"PeriodicalIF":3.2,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916979","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}

引用次数: 0

A 18–24.5 GHz high-power-density GaN MMIC power amplifier with impedance-frequency-tracking-based wideband matching approach 基于阻抗-频率跟踪的宽带匹配方法的18-24.5 GHz高功率密度GaN MMIC功率放大器

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-28 DOI: 10.1016/j.aeue.2025.156014

Jianqiang Chen , Jiajin Li , Jingzhou Pang , Gary Zhang

{"title":"A 18–24.5 GHz high-power-density GaN MMIC power amplifier with impedance-frequency-tracking-based wideband matching approach","authors":"Jianqiang Chen , Jiajin Li , Jingzhou Pang , Gary Zhang","doi":"10.1016/j.aeue.2025.156014","DOIUrl":"10.1016/j.aeue.2025.156014","url":null,"abstract":"<div><div>This article proposes a novel broadband power amplifier (PA) design methodology based on a multi-stage configuration featuring frequency-tracking impedance matching and gain equalization through frequency-dependent load control. Specifically, a multi-stage PA architecture is introduced where the final stage implements frequency-following load impedance matching, while the driver stage employs frequency-variant load impedance to regulate gain-frequency characteristics, collectively enabling effective broadband operation. For validation, an 18–24.5 GHz broadband PA was fabricated using 0.15-<span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span> Gallium Nitride (GaN)-on-silicon carbide (SiC) high-electron-mobility transistor (HEMT) technology. Measurements demonstrate saturated output power of 31.5–32.5 dBm, power gain of 26.7–29 dB, and power-added efficiency (PAE) of 23.6–31.3% across the operating band. It means that a power density of 3.5–4.4 W/mm over a 30.5% fractional bandwidth is achieved and a possible design paradigm of broad PA for K-band broadband applications is given.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 156014"},"PeriodicalIF":3.2,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921528","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}

引用次数: 0

Reconfigurable intelligent surface-assisted AFDM for high-mobility communications 用于高移动性通信的可重构智能表面辅助AFDM

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-25 DOI: 10.1016/j.aeue.2025.156009

Xiating Wu , Xiaoping Jin , Meiyan Song , Song Xing , Chongwen Huang , Yudong Yao

{"title":"Reconfigurable intelligent surface-assisted AFDM for high-mobility communications","authors":"Xiating Wu , Xiaoping Jin , Meiyan Song , Song Xing , Chongwen Huang , Yudong Yao","doi":"10.1016/j.aeue.2025.156009","DOIUrl":"10.1016/j.aeue.2025.156009","url":null,"abstract":"<div><div>To overcome the large Doppler shift in high-mobility communications, affine frequency division multiplexing (AFDM) has recently emerged as a promising alternative to orthogonal frequency division multiplexing (OFDM). By employing the discrete affine Fourier transform, AFDM effectively mitigates time–frequency doubly selective fading and outperforms OFDM in high-Doppler scenarios. Meanwhile, reconfigurable intelligent surfaces (RIS) have also gained attention as a transformative technology for enhancing communication performance under mobility. To further improve the bit error rate (BER) performance, we propose an RIS-assisted AFDM system tailored for high-mobility settings. We first derive the input–output relations of the system in both the time and discrete affine Fourier domains. Next, the system is extended to a multiple-input multiple-output model. Then, we present an RIS phase-shift design method to maximize the signal-to-noise ratio at the receiver. Finally, we evaluate the influence of critical system parameters such as the number of RIS units, phase optimization methods, channel conditions, and antenna configurations on the system’s performance in doubly dispersive channels. Simulation results demonstrate that the proposed optimization method yields a substantial improvement in BER performance over random phase optimization. Furthermore, the proposed RIS-assisted AFDM system achieves significantly lower BER compared to both RIS-OFDM and conventional AFDM systems in doubly dispersive channels.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 156009"},"PeriodicalIF":3.2,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908632","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}

引用次数: 0

Thermally reconfigurable quad-port MIMO antenna with independent frequency tuning 具有独立频率调谐的热可重构四端口MIMO天线

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-22 DOI: 10.1016/j.aeue.2025.156008

Anıl Karatay, Enes Ataç

引用次数: 0

Direct demodulation approach for regular hexagonal QAM constellations 正六边形QAM星座的直接解调方法

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-22 DOI: 10.1016/j.aeue.2025.156010

Tooraj Jafari , Alireza Andalib , Asghar Charmin , Saeed Barghandan

引用次数: 0

Highly miniaturized Gysel power divider with suppression of harmonics employing multiple transmission line techniques 高度小型化的Gysel功率分配器，采用多传输线技术抑制谐波

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-21 DOI: 10.1016/j.aeue.2025.156012

Mukesh Kumar , Sanjeev Kumar , Gobinda Sen , Santanu Das

引用次数: 0

Flip-flop topology inspired forward deep neural network learning approach for modelling UWB antennas 基于触发器拓扑的前向深度神经网络学习方法用于超宽带天线建模

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-21 DOI: 10.1016/j.aeue.2025.156007

Debanjali Sarkar , Partha P. Shome , Taimoor Khan , Sembiam R. Rengarajan

{"title":"Flip-flop topology inspired forward deep neural network learning approach for modelling UWB antennas","authors":"Debanjali Sarkar , Partha P. Shome , Taimoor Khan , Sembiam R. Rengarajan","doi":"10.1016/j.aeue.2025.156007","DOIUrl":"10.1016/j.aeue.2025.156007","url":null,"abstract":"<div><div>Human-engineered systems exhibiting intelligent behavior can reduce the constraints associated with designing complex circuits, computational resources, and processing time. Machine learning (ML) algorithms enable us to imitate and create such intelligent systems. In recent years, ML algorithms have gained recognition for efficiently solving complex electromagnetic (EM) circuit design problems. Modeling high-dimensional multi-parametric structures is a significant problem for the EM research community. To address this issue, a deep neural network (DNN) learning approach based on flip-flop topology is presented in this work for fast and efficient modeling of ultra-wideband (UWB) antennas. The proposed approach comprises two interconnected DNN models (DNN I and DNN II) wherein the output of each model is iteratively fed into the other, enabling it to use both real-time output and past predictions. This bidirectional inter-model feedback enhances the capacity of the model to make precise predictions over time. The effectiveness of the proposed model is demonstrated through its application to fast and accurate modeling of miniaturized high-gain UWB antennas and compact quad-UWB multi-input multi-output (MIMO) antennas. For the high-gain UWB antenna, the FFDNN achieved a training MAPE of 0.35 % and testing MAPE of 1.41 %, representing minimum improvements of up to 78 % in training and 39 % in testing compared to traditional MLP, DNN, and FDDNN models. Similarly, for the UWB-MIMO antenna, the FFDNN achieved a training MAPE of 1.12 % and testing MAPE of 1.20 %, marking minimum improvements of approximately 48 % and 60 %, respectively, over traditional MLP, DNN, and FDDNN models. These results highlight the model’s capability to serve as a fast, data-driven surrogate for EM design tasks, offering significant gains in prediction accuracy and computational efficiency over conventional approaches.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 156007"},"PeriodicalIF":3.2,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144912908","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}

引用次数: 0

Spiking neural network circuit with op-amp based LIF neuron and RRAM synaptic array 基于运算放大器的LIF神经元和RRAM突触阵列的脉冲神经网络电路

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-20 DOI: 10.1016/j.aeue.2025.156004

Eashwar M.V. , Nivetha T. , Bindu B. , Noor Ain Kamsani

引用次数: 0

A concurrent dual-band LNA for 2.4 GHz and 5.2 GHz application based on active inductor technic 基于有源电感技术的2.4 GHz和5.2 GHz并发双频LNA

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-20 DOI: 10.1016/j.aeue.2025.155993

Hongyun Xie, Wentai Hu, Yudong Ma, Ziming Liu, Weizhao Jiao, Tieyi Li, Yudi Liu, Wanrong Zhang

{"title":"A concurrent dual-band LNA for 2.4 GHz and 5.2 GHz application based on active inductor technic","authors":"Hongyun Xie, Wentai Hu, Yudong Ma, Ziming Liu, Weizhao Jiao, Tieyi Li, Yudi Liu, Wanrong Zhang","doi":"10.1016/j.aeue.2025.155993","DOIUrl":"10.1016/j.aeue.2025.155993","url":null,"abstract":"<div><div>A concurrent dual-band low-noise amplifier (DB-LNA) based on active inductors was designed to operate at 2.4 GHz and 5.2 GHz to meet IEEE 802.11 n standards. The conventional common source cascode topology without the source degeneration inductor is implemented in the gain control stage. Input impedance matching is achieved with a single-path circuit resonating at two distinct frequencies, while output matching is accomplished using band-pass and band-stop filters. Active inductors replace traditional passive inductors to reduce layout area, and their high Q factor minimizes power consumption. Furthermore, gate noise is suppressed with a capacitor between source and gate in the input stage. The results show that the proposed DB-LNA has gains of 17.2 dB and 12.0 dB at 2.4 GHz and 5.2 GHz, respectively, with noise figures of 3.5 dB and 4.7 dB. The <span><math><msub><mrow><mi>S</mi></mrow><mrow><mn>11</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>S</mi></mrow><mrow><mn>22</mn></mrow></msub></math></span> of the DB-LNA are both less than −10 dB at both frequency bands. The 1 dB compression points are −23.9 dBm at 2.4 GHz and −18.7 dBm at 5.2 GHz, with third-order input intercept point values of −13.1 dBm and −8.3 dBm, respectively. The total power dissipation is 15.72 mW with a 1.2 V supply, and the layout area is 0.32 mm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 155993"},"PeriodicalIF":3.2,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908635","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}

引用次数: 0

Design of a fourth-order bandpass frequency selective surface via aperture-coupled approach 利用孔径耦合方法设计四阶带通频率选择表面

IF 3.2 3区计算机科学

Aeu-International Journal of Electronics and Communications Pub Date : 2025-08-20 DOI: 10.1016/j.aeue.2025.155989

Neelavathy M., Yogesh Kumar Choukiker

{"title":"Design of a fourth-order bandpass frequency selective surface via aperture-coupled approach","authors":"Neelavathy M., Yogesh Kumar Choukiker","doi":"10.1016/j.aeue.2025.155989","DOIUrl":"10.1016/j.aeue.2025.155989","url":null,"abstract":"<div><div>This article presents the design and experimental validation of a single-passband, fourth-order frequency selective surface (FSS). A circular patch resonator loaded with diagonal triangle slot is first designed to characterize the dual-mode operation. To suppress cross-polarized reflections generated by these modes, four such resonators are arranged with a <span><math><mrow><mn>9</mn><msup><mrow><mn>0</mn></mrow><mrow><mi>o</mi></mrow></msup></mrow></math></span> separation between adjacent patches. Following this, a single-band bandpass FSS based on a multilayer aperture-coupled (AC) structure is developed. The designed FSS provides greater flexibility in achieving single-band higher-order filtering responses compared to traditional AC patch resonators. It is validated through electric and magnetic coupling in the slot-loaded AC circular patch resonator, confirming the effectiveness of the design approach. Additionally, an equivalent circuit is developed using lumped elements, and both even- and odd-mode analyses are performed. The fabricated FSS prototypes are experimentally validated, demonstrating angular stability across varying incidence angles from <span><math><msup><mrow><mn>0</mn></mrow><mrow><mi>o</mi></mrow></msup></math></span> to <span><math><mrow><mn>5</mn><msup><mrow><mn>0</mn></mrow><mrow><mi>o</mi></mrow></msup></mrow></math></span>, while maintaining consistent resonant behavior for broadband responses.</div></div>","PeriodicalId":50844,"journal":{"name":"Aeu-International Journal of Electronics and Communications","volume":"201 ","pages":"Article 155989"},"PeriodicalIF":3.2,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144887047","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}

引用次数: 0