Engineering Science and Technology-An International Journal-Jestech最新文献

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Switching oscillation-based fractional-domain high-sensitive diagnosis of machine turn insulation degradation 基于开关振荡的电机匝绝缘退化分数域高灵敏度诊断
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-10 DOI: 10.1016/j.jestch.2025.102224
Muhammad Usman Sardar, Toomas Vaimann, Lauri Kütt, Bilal Asad, Ants Kallaste
{"title":"Switching oscillation-based fractional-domain high-sensitive diagnosis of machine turn insulation degradation","authors":"Muhammad Usman Sardar,&nbsp;Toomas Vaimann,&nbsp;Lauri Kütt,&nbsp;Bilal Asad,&nbsp;Ants Kallaste","doi":"10.1016/j.jestch.2025.102224","DOIUrl":"10.1016/j.jestch.2025.102224","url":null,"abstract":"<div><div>Stator turn insulation degradation is a significant cause of failure in electric machines fed by high-frequency switching power electronic devices, making early-stage detection challenging due to weak fault characteristic signatures. This paper presents a novel non-invasive monitoring framework that integrates a proposed low-to-high-frequency parametric grey-box model (GBM) of the motor with advanced signal processing techniques. Key electrical parameters of the motor are extracted using optimal fitting with impedance spectroscopy, which represent frequency-dependent behaviors influenced by insulation degradation. To enhance detection sensitivity, the method employs an optimized fractional Fourier transform at the optimal order, coupled with a customized resonance-centred Mel filter bank (FRFT-RMFB). Experimental results on a 0.75 kW induction motor with controlled insulation degradation, implemented by parallel capacitive loading, show a higher improvement in early-stage fault sensitivity. The proposed FRFT‑RMFB method enhances the sensitivity of turn insulation state estimation by nearly sevenfold compared with the conventional Fourier transform approach. The proposed framework is lightweight, generalized, and well-suited for real-time predictive maintenance, effectively minimizing false alarms in safety–critical applications such as industrial drives, electric vehicles, and high-speed rail systems. This work contributes to a new direction in frequency-domain diagnostics, combining accurate parametric modeling with high-resolution spectral feature extraction for early detection of insulation faults.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102224"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Novel multi-functional and compact waveguide filter based on various meta-resonators for C-band applications c波段应用中基于各种元谐振器的新型多功能紧凑波导滤波器
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-12-09 DOI: 10.1016/j.jestch.2025.102213
Abdullah Genc , Habib Dogan
{"title":"Novel multi-functional and compact waveguide filter based on various meta-resonators for C-band applications","authors":"Abdullah Genc ,&nbsp;Habib Dogan","doi":"10.1016/j.jestch.2025.102213","DOIUrl":"10.1016/j.jestch.2025.102213","url":null,"abstract":"<div><div>This paper presents the design, fabrication, and performance analysis of a novel, multi-functional WGF for C-band (4.90–7.05 GHz) applications. The novel WR-159 WG structure is precisely fabricated from Al6065 material by the CNC milling method, and also <em>meta</em>-resonator structures designed in different sizes and geometries are fabricated from low-loss Duroid/RT 5880 substrate material with help of LPKF. Thanks to the designed single WR-159 WG structure, the WGF with four different functions is experimentally realized using a set of <em>meta</em>-resonators that can be mounted and dismounted. These four functions are bandpass/bandstop, narrow/medium/wide bandwidth, shifting operating frequency (5.5, 6, and 6.5 GHz), and filter order (n = 1–7). Filter performance has been verified through simulations and measurements with a vector network analyzer (VNA). For each WGF designed for different functions, simulated and measured performance results, such as for center frequency (f<sub>0</sub>), return loss (RL), insertion loss (IL), fractional bandwidth (FBW), and quality factor (Q) are compared, and they have good agreement with each other. The proposed modular structure offers a low-cost and versatile alternative that can replace commercial filters.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102213"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145747889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Air side thermal and hydraulic performance assessment of skived, louver, offset honeycomb, and metal foam finned mini-channel heat exchangers 楔形,百叶,偏移蜂窝和金属泡沫翅片微型通道热交换器的空气侧热和水力性能评估
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-12-02 DOI: 10.1016/j.jestch.2025.102242
Bahadır Doğan , M. Mete Ozturk , Levent Turhan
{"title":"Air side thermal and hydraulic performance assessment of skived, louver, offset honeycomb, and metal foam finned mini-channel heat exchangers","authors":"Bahadır Doğan ,&nbsp;M. Mete Ozturk ,&nbsp;Levent Turhan","doi":"10.1016/j.jestch.2025.102242","DOIUrl":"10.1016/j.jestch.2025.102242","url":null,"abstract":"<div><div>This study presents a comparative performance evaluation of mini-channel compact heat exchangers, focusing on four distinct extended surface configurations of skived plate fin, louver fin, metal foam, and offset honeycomb. The experiments are conducted in an air tunnel, where the <em>Re</em> number of the airflow ranges from 100–1400, and a constant surface temperature is maintained using a water bath. To ensure a fair comparison, all four configurations are tested under identical conditions. The performance of each configuration is assessed in terms of air-side heat transfer coefficient, pressure drop, Colburn <em>j</em>-factor, and friction factor. In addition to these conventional performance indicators, the heat exchangers are further evaluated using the heat transfer index with respect to friction power, both with and without accounting for compactness. According to the findings, although the cell-based configurations consistently outperform the plate-fin configurations under all conditions, the metal foam and offset honeycomb each demonstrate superiority in different performance metrics. While the heat transfer coefficient reaches approximately 110 W/(m<sup>2</sup>K) for the metal foam configuration, the offset honeycomb achieves up to 100 W/(m<sup>2</sup>K) within the same flow range. When evaluated based on the heat transfer index considering compactness, the performance order shifts, with offset honeycomb and metal foam providing values of 60.08 kW/(m<sup>3</sup>K) and 56.76 kW/(m<sup>3</sup>K), respectively. Under all tested conditions, the louver configuration, although the most commonly utilized extended surface in conventional applications, falls short of achieving the performance levels demonstrated by the novel designs introduced in this study.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102242"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 novel mixed Rayleigh distribution model using PID based search algorithm for wind energy applications 基于PID搜索算法的混合瑞利分布模型在风能应用中的应用
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-21 DOI: 10.1016/j.jestch.2025.102239
Hilmi Aygün , Bayram Köse
{"title":"A novel mixed Rayleigh distribution model using PID based search algorithm for wind energy applications","authors":"Hilmi Aygün ,&nbsp;Bayram Köse","doi":"10.1016/j.jestch.2025.102239","DOIUrl":"10.1016/j.jestch.2025.102239","url":null,"abstract":"<div><div>Accurate modeling of wind speed distributions is a critical prerequisite for reliable wind energy assessment, system optimization, and long-term performance prediction. Conventional probability distribution functions exhibit notable deviations between the observed and estimated wind speed frequency distributions, indicating their limited capability in capturing the actual variability of wind regimes. To address this gap, this study introduces, for the first time in the wind energy domain, the application of a Mixed Rayleigh distribution in combination with a PID-based metaheuristic optimization algorithm (PSA) for parameter estimation. The proposed approach was tested at three measurement stations: Karaburun, Mersinkoy, and Gelibolu, using extensive wind speed datasets. Comparative analyses were conducted between PSA based Rayleigh, Mixed Rayleigh, and Weibull models, alongside conventional Moment and Maximum Likelihood methods. The proposed model achieved the lowest Sum Square Error (SSE) (0.0016) and Root Mean Square Error (RMSE) (0.0091) in Karaburun, the lowest SSE (0.0014) and RMSE (0.0075) in Gelibolu, and consistently high determination coefficients (R<sup>2</sup> ≈ 0.9999) across all regions. Additionally, the model yielded the lowest Mean Absolute Percentage Error (MAPE) based on Wind Power Density (WPD) (4.11 %) in Mersinköy and relatively low MAPE values based on Average Wind Speed (3.74 % and 3.26 %) in Karaburun and Mersinköy, respectively. In particular, the Mixed Rayleigh model demonstrated superior flexibility, resulting in improved fitting accuracy and reduced estimation errors. Overall, the findings highlight the methodological novelty and practical potential of combining hybrid distribution functions with advanced optimization algorithms.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102239"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
New ACCWOA algorithm based on the acceleration mechanism for solving engineering design problems and global optimization 基于加速机制的ACCWOA算法求解工程设计问题及全局优化
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-17 DOI: 10.1016/j.jestch.2025.102202
Ahmed Noori Algburi, Isa Avci
{"title":"New ACCWOA algorithm based on the acceleration mechanism for solving engineering design problems and global optimization","authors":"Ahmed Noori Algburi,&nbsp;Isa Avci","doi":"10.1016/j.jestch.2025.102202","DOIUrl":"10.1016/j.jestch.2025.102202","url":null,"abstract":"<div><div>The Accelerated Whale Algorithm (ACCWOA) is a new version of the Whale Optimization Algorithm (WOA) that incorporates a velocity factor into the individuals. The WOA is a nature-inspired metaheuristic algorithm widely applied to solve engineering problems, which uses shrinking and spiral insertion movements to exploit the solution, and random search to discover new solutions. This algorithm suffers from slow convergence in early iterations, a lack of fine-tuned local search, stagnation in local optima, a lack of mechanisms to maintain diversity, and a lack of historical learning. To address these limitations, this work proposes an acceleration technique that mimics the rapid movement of whales as they pursue their prey. Acceleration technology utilizes the velocity equation to achieve accelerated convergence, enhanced exploitation, improved diversity retention, dynamic behavior, increased scalability and stability, and emergent memory capabilities. The algorithm was evaluated on standard benchmarks, IEEE CEC-2014 and CEC-2017 suites, and five engineering design problems: spring, three-bar truss, pressure vessel, welded beam, and cantilever beam. Results show that ACCWOA achieves rapid convergence, accurate solutions, and competitive efficiency compared to state-of-the-art methods.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102202"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145579475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Investigation of power injection capability and leakage current of H6-II type inverter with different modulation techniques 不同调制技术下H6-II型逆变器功率注入能力和漏电流的研究
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-10-30 DOI: 10.1016/j.jestch.2025.102210
Pelin Turkmen, Emre Ozkop
{"title":"Investigation of power injection capability and leakage current of H6-II type inverter with different modulation techniques","authors":"Pelin Turkmen,&nbsp;Emre Ozkop","doi":"10.1016/j.jestch.2025.102210","DOIUrl":"10.1016/j.jestch.2025.102210","url":null,"abstract":"<div><div>The increasing adoption of grid-connected photovoltaic systems necessitates highly efficient and cost-effective inverter solutions. Transformerless inverters offer significant advantages in this regard, including enhanced efficiency, reduced cost, and compact size. However, their widespread deployment faces critical challenges, particularly concerning the management of leakage current and the growing demand for reactive power injection capabilities to support grid stability. This study investigates the performance of a single-phase transformerless inverter topology under various modulation strategies to address these challenges.</div><div>We evaluate the inverter’s ability to inject both active and reactive power, analyzing key performance indicators such as efficiency, total harmonic distortion, common mode voltage, and leakage current. The research explores the impact of different modulation techniques, including both conventional and novel approaches, as well as various signal and carrier wave configurations. Our findings aim to provide crucial insights into optimizing inverter design and operation for grid-connected applications, contributing to the development of more reliable and efficient renewable energy systems. This work is particularly motivated by the need to mitigate leakage current issues and enhance reactive power support in these essential power conversion devices, thereby facilitating their broader integration into modern electrical grids.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102210"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145425128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Dipping microcapillary-based droplet fabrication: Multiscale and structurally diverse droplets with programmable real-time size control 浸渍微毛细管液滴制造:多尺度和结构多样的液滴与可编程的实时尺寸控制
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-06 DOI: 10.1016/j.jestch.2025.102223
Dong Min Ji , Armando Ramos-Sebastian , Yung-Taek Ouh , Changho Yu , Sung Hoon Kim
{"title":"Dipping microcapillary-based droplet fabrication: Multiscale and structurally diverse droplets with programmable real-time size control","authors":"Dong Min Ji ,&nbsp;Armando Ramos-Sebastian ,&nbsp;Yung-Taek Ouh ,&nbsp;Changho Yu ,&nbsp;Sung Hoon Kim","doi":"10.1016/j.jestch.2025.102223","DOIUrl":"10.1016/j.jestch.2025.102223","url":null,"abstract":"<div><div>This study presents an innovative “off-chip” droplet manufacturing system, which operates through hydrodynamic interactions between an adjustable flow from a microcapillary and its periodic immersion into a continuous phase. This method circumvents the limitations of conventional microfluidic chips, which are costly and complex to produce, and suffer from restricted control over droplet size. The novel system facilitates the instantaneous alteration of droplet diameters, ranging from approximately one centimeter to several tens of micrometers (77 µm). It employs a slowly rotating continuous phase to prevent droplet agglomeration and precisely manage their sedimentation location. A theoretical model is proposed, linking the radius of the produced droplets to the flow rate of the dispersed phase and the dipping frequency of the microcapillary. This model has been corroborated through computational simulations and empirical experiments. Furthermore, the system has demonstrated proficiency in producing Janus-type and multi-emulsion droplets by simply modifying the geometry of the microcapillary. The absence of microchannel confinement enables the arrangement of droplets into intricate structures, showcasing the system’s unique capacity to utilize both dispersed and continuous phases for creating functional materials with complex multidimensional droplets.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102223"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145475331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Investigation of structural behavior in natural and synthetic fiber reinforced multilayer composites based on resin and additives 基于树脂和添加剂的天然和合成纤维增强多层复合材料的结构性能研究
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-29 DOI: 10.1016/j.jestch.2025.102240
Samet Karabulut, Kaan Kaysadı, Faruk Gümüş
{"title":"Investigation of structural behavior in natural and synthetic fiber reinforced multilayer composites based on resin and additives","authors":"Samet Karabulut,&nbsp;Kaan Kaysadı,&nbsp;Faruk Gümüş","doi":"10.1016/j.jestch.2025.102240","DOIUrl":"10.1016/j.jestch.2025.102240","url":null,"abstract":"<div><div>In our study, jute natural fiber and glass fiber were preferred as reinforcing elements. Epoxy, vinyl ester, and polyester were selected as matrix materials, and sodium hydroxide and magnesium hydroxide were used as additives. When the results were analyzed, the samples produced with epoxy yielded good results in tensile and elongation tests compared to the others, while the average values remained the same in bending and impact tests. The presence of additives was also observed in the SEM images and EDS results.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102240"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145623599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Numerical and experimental investigation of the seismic behavior of rigid steel beam-to-hollow circular column connections using a steel box 钢箱梁-空心圆柱连接抗震性能的数值与试验研究
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-11-15 DOI: 10.1016/j.jestch.2025.102233
Abdulrahman Kamil Aakool AL-Hureshat , Mehrzad TahamouliRoudsari , AllahReza Moradi Garoosi , Mohsen Oghabi
{"title":"Numerical and experimental investigation of the seismic behavior of rigid steel beam-to-hollow circular column connections using a steel box","authors":"Abdulrahman Kamil Aakool AL-Hureshat ,&nbsp;Mehrzad TahamouliRoudsari ,&nbsp;AllahReza Moradi Garoosi ,&nbsp;Mohsen Oghabi","doi":"10.1016/j.jestch.2025.102233","DOIUrl":"10.1016/j.jestch.2025.102233","url":null,"abstract":"<div><div>Rigid beam-to-circular steel column connections have always attracted the attention of researchers and design codes due to their geometric complexity and construction challenges. In this study, the use of a steel box at the connection region is proposed for joining I-shaped sections to hollow circular columns. This method offers advantages such as simplified detailing and eliminates the need for continuity plates or doubler plates. The initial design of the experimental specimens was performed numerically, and then three specimens exhibiting superior performance were selected for experimental investigation. The experimental studies examined the effect of the configuration of column-to-box and beam-to-box stiffeners on their seismic performance. Subsequently, further numerical studies were conducted on the experimentally superior specimen. After validating the numerical model, the effect of the steel box thickness on the connection with various beam and column sections was evaluated. The aim of this part was to determine the minimum required thickness for the steel box, beyond which further increases would not affect the results. Additionally, the rigidity of the connection was also investigated. The experimental results indicated that the model with internal box stiffeners aligned with the beam flanges provided the highest strength, ductility, and elastic stiffness. Parametric analyses indicated that rigid behavior and full beam capacity can be ensured when the steel box thickness is at least 1.4 times the beam flange thickness.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102233"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145529275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Linear Doherty power amplifier design based on adaptive input signal power control 基于自适应输入信号功率控制的线性多尔蒂功率放大器设计
IF 5.4 2区 工程技术
Engineering Science and Technology-An International Journal-Jestech Pub Date : 2025-12-01 Epub Date: 2025-12-05 DOI: 10.1016/j.jestch.2025.102247
Zhiqing Liu , Ye Zhong , Zhijiang Dai
{"title":"Linear Doherty power amplifier design based on adaptive input signal power control","authors":"Zhiqing Liu ,&nbsp;Ye Zhong ,&nbsp;Zhijiang Dai","doi":"10.1016/j.jestch.2025.102247","DOIUrl":"10.1016/j.jestch.2025.102247","url":null,"abstract":"<div><div>In modern wireless communication systems, the trade-off between efficiency and linearity in Doherty power amplifiers (DPAs) remains a critical challenge. To address this, a novel Schottky diode-based input matching network is presented for peaking power amplifiers (PAs) which leverages a dual optimization mechanism: (1) adaptive gate DC bias adjustment via Schottky rectification, enabling Class B operation in high-power regions to enhance DPA linearity; and (2) nonlinear impedance modulation to suppress premature peaking PA activation in low-power regions, thereby improving back-off efficiency. Based on this structure, an asymmetric DPA is designed and manufactured, with continuous wave test results showing that saturation efficiency is higher than 50%, saturated output power reaches more than 43.4 dBm, and the back-off efficiency of 9 dB is 41.2%–55.6% in the operating band of 0.75–1.25 GHz. The adjacent channel power ratio (ACPR) of the PA is tested using a 20 MHz quadrature amplitude modulation (QAM) signal with a PAPR of 9 dB, and the test results show that, in the band of 1.0–1.3 GHz, the ACPR is −38.1 to −34.0 dBc and average efficiency is from 34.2%–45.5% at an average output power of 36 dBm, which verifies that the designed DPA has good linearity performance.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"72 ","pages":"Article 102247"},"PeriodicalIF":5.4,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145693537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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