Journal of Microwave Power and Electromagnetic Energy最新文献

{"title":"Dielectric and chemical composition characterization of ground water collected from different water sources","authors":"F. M. Modi, D. H. Gadani, V. A. Rana","doi":"10.1080/08327823.2024.2305490","DOIUrl":"https://doi.org/10.1080/08327823.2024.2305490","url":null,"abstract":"Dielectric characterization of water samples, of different water sources such as borewell and step well located at three different places of the Gujarat State were carried out. Complex permittivity...","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"11 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139761349","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}

{"title":"Electromagnetic and microwave properties of single-layer thermoplastic natural rubber (TPNR)/yttrium iron garnet (Y3Fe5O12)/magnetite (Fe3O4) composites backed by a perfect conductor","authors":"A. N. Yusoff, J. M. Sani","doi":"10.1080/08327823.2024.2308334","DOIUrl":"https://doi.org/10.1080/08327823.2024.2308334","url":null,"abstract":"The use of a single-layer material for microwave applications continues to attract many researchers due to materials’ homogeneity in an acceptable range of thickness. This study outlines the microw...","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"308 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139768386","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}

{"title":"A novel wall parameter estimation approach based on transmission line method from through-wall radar measurements","authors":"Akhilendra Pratap Singh","doi":"10.1080/08327823.2024.2305485","DOIUrl":"https://doi.org/10.1080/08327823.2024.2305485","url":null,"abstract":"A novel technique for estimation of the wall’s relative permittivity, thickness and conductivity from signals measured from the through-wall radar is presented in this paper. The retrieval process ...","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"3 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139555856","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}

{"title":"A three-stub waveguide impedance matching algorithm based on equivalent circuit analysis","authors":"Danfeng Zhou, Nouman Rasool, Zhengming Tang, Huacheng Zhu, Tao Hong","doi":"10.1080/08327823.2024.2305486","DOIUrl":"https://doi.org/10.1080/08327823.2024.2305486","url":null,"abstract":"Three-stub waveguide is a common impedance matching device, which is widely used in microwave impedance matching system. In this paper, an impedance matching algorithm for three-stub waveguide with...","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"3 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139555495","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}

{"title":"Dielectric properties of tobacco and tomato plant leaves over a broad frequency range","authors":"Pratipal D. Chauhan, Deepak H. Gadani, Vipin A. Rana","doi":"10.1080/08327823.2023.2269492","DOIUrl":"https://doi.org/10.1080/08327823.2023.2269492","url":null,"abstract":"Abstract Complex permittivity of tomato and tobacco leaves have been measured over the 20 Hz − 2 MHz frequency range using a precision LCR-Meter, and over frequency range from 500 MHz to 15 GHz using a Vector Network Analyzer. Complex permittivity of leaves is found to increase as the moisture content in the leaves increases, at a fixed frequency. At lower frequencies, the dielectric constant ε’ of leaves decreases with increase in frequency up to 2 MHz. At 2 MHz, the complex permittivity ε* = ε′ – jε″ for Tobacco leaves varies from 3855 – j 2863 to 6.12 – j 0.29 with decrease in moisture content, whereas for Tomato leaves ε* varies from 5900 – j 3116 to 3.06 – j 0.29 with decrease in moisture contents in the leaves. Over the microwave frequency range, the dielectric constant and dielectric loss of low moist leaves decreases with increase in frequency. For the leaves having higher moisture content, the dielectric loss decreases rapidly with increase in frequency from 500 MHz to about 5 GHz, after which it starts to increase with increase in the frequency, approaching a relaxation peak. At 14 GHz, the complex permittivity ε* for Tobacco leaves varies from 26.86 – j 26.45 to 2.31 – j 0.034 with decrease in moisture content, whereas for Tomato leaves ε* varies from 23.37 – j 17.50 to 1.67 – j 0.004 with decrease in moisture contents in the leaves. A good agreement is observed between measured values of complex permittivity, with the values calculated using Debye-Cole dual-dispersion dielectric model. Brewster’s angle corresponding to vertical polarization in emissivity calculation is found to increase with increase in moisture content in the leaves.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902320","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}

{"title":"Effect of microwave treatment on the alkaline extraction of proteins and phenolics from perilla seed meal in varying pH conditions: An optimization study using multicomponent analysis","authors":"Rahul Kumar, Aniket Kamboj, Rakhi Singh, Rajni Chopra","doi":"10.1080/08327823.2023.2269493","DOIUrl":"https://doi.org/10.1080/08327823.2023.2269493","url":null,"abstract":"AbstractPerilla seed meal (PSM) is a by-product rich in proteins and bioactive compounds obtained by cold pressed oil extraction method. Microwave is an efficient nonconventional technology usually used to accelerate the recovery of the extracts. In this study, pH, microwave power and treatment time were optimized to maximize the recovery of targeted compounds using Box–Behnken design. The pH was found to be the most significant variable affecting the yield followed by microwave power and treatment time (based on F-value). Compared to conventional alkaline extraction, an increase in the yield of protein content by 10.58%, antioxidant activity by 7.48% and total phenolic content by 21.59% was recorded at the optimal values of pH (11.5) microwave power (160 W) and treatment time (30 s). Moreover, principle component analysis revealed opposite correlation between antioxidant activity and extraction of protein/phenolics suggesting the loss of bioactivity at the higher yield of extracts. Also, from the clustering analysis, the effect of microwave treatment found to be lower in more extreme alkaline conditions compared to lower pH values. Hence, lower alkaline conditions are suggested for the microwave treatment to develop better control system in the extraction industry.HighlightsPlant extracts are frequently obtained using microwave-assisted extraction (MAE)Alkalinity level, microwave power and exposure time were analyzedMulticomponent analysis revealed optimum microwave treatments at less alkaline conditionsThe protein yield was 10.5% higher while total phenolic content was 21.6% higher than conventional alkaline extraction in optimum microwave conditionsThe MAE is recommended to obtain a high recovery of extracts with minimum degradationKeywords: Microwave assisted extractionmulticomponent analysisperilla seed mealantioxidant activitytotal phenolic contentproteins Disclosure StatementThe author declares no conflict of interest.Additional informationFundingThis research was funded by the Seed money project, NIFTEM/Dean Research/2020/18, National Institute of Food Technology Entrepreneurship and Management, Kundli, Sonepat, Haryana, India.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902795","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}

{"title":"Editor’s message: writing and refereeing review papers","authors":"Aguilar-Garib Juan Antonio","doi":"10.1080/08327823.2023.2274169","DOIUrl":"https://doi.org/10.1080/08327823.2023.2274169","url":null,"abstract":"","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135948738","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}

{"title":"Experimental investigation of radio frequency heating uniformity of wheat flour surrounded by deionized water and NaCl solution","authors":"Welat Miran, T. Koray Palazoğlu","doi":"10.1080/08327823.2023.2269495","DOIUrl":"https://doi.org/10.1080/08327823.2023.2269495","url":null,"abstract":"AbstractThe present study proposes an approach to overcome the problem of corner/edge overheating of foods undergoing radio frequency heating. For testing, a container with a central rectangular compartment surrounded by a frame of four compartments was used. Wheat flour, a representative of low-moisture foods, was packed inside the rectangular compartment to provide a density of 800 kg/m3. Afterwards, in the surrounding compartments, air, deionized water and NaCl solution were used for independent radio frequency heating tests. Two different electrode gaps (135 and 145 mm) were employed. The temperature of the sample was measured continuously using fibre optic probes at four different internal locations. The difference between the maximum and the minimum temperatures for three different cases (a: air, b: deionized water and c: NaCl solution) were as follows for electrode gaps of 135 and 145 mm, respectively: (a) 27.3 and 26.1 °C, (b) 2.5 and 4.8 °C and (c) 3.7 and 1.8 °C. Uniformity index values were also calculated. The results showed that temperature variation within the sample was greatly reduced when the sample was surrounded by deionized water or NaCl solution.PRACTICAL APPLICATIONThe project findings will provide processors with a practical means to achieve more uniform radio frequency heating of low-moisture foods.Keywords: Radio frequency heatingheating uniformitywheat flourdeionized waterNaCl solution Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the Scientific Research Projects Unit of Mersin University (Project no: 2019-3-TP3-3787), Council of Higher Education (100/2000 Doctoral Scholarship Programme) and Scientific and Technical Research Council of Turkey, TUBITAK (2211-A National Doctoral Scholarship Programme).","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902025","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}

{"title":"3-D scanned oven geometry improves the modeling accuracy of the solid-state microwave heating process","authors":"Kartik Verma, Jarrod Nachtrab, Jake Dvorak, Peter Alley, Ran Yang, Hao Gan, Jiajia Chen","doi":"10.1080/08327823.2023.2269496","DOIUrl":"https://doi.org/10.1080/08327823.2023.2269496","url":null,"abstract":"AbstractSolid-state-based microwave ovens are promising to mitigate the non-uniformity issue for their precise controlled microwave parameters. Multiphysics modeling is a useful tool for understanding complicated microwave heating processes. However, previous models using simple or manually measured oven geometry had challenges in accurately predicting the heating patterns. This study developed a 3-D scanning approach to characterize the accurate geometric details of the cavity and incorporate it in the multiphysics modeling of solid-state microwave heating. The effect of oven geometric details on modeling accuracy was evaluated for models using the simple box, manually measured, and 3-D scanned geometries at multiple microwave frequencies and port locations. A quantitative approach was also developed to replace the previously often-used qualitative approach to compare the spatial temperature profiles between the simulation and experiments. The Multiphysics-based models using 3-D scanned geometry showed significantly or considerably smaller RMSE values (1.57 to 4.11 °C) than the models with simple box geometry (1.73 to 6.33 °C) and manually measured geometry (1.48 to 4.66 °C) at most heating scenarios. The 3-D scanned approach can accurately incorporate the irregular geometric details of the oven cavity and can improve the prediction accuracy of microwave heating models for future food products and oven development.Keywords: Solid-state3-D scanningthermal imagesheating patternsimulationCOMSOL AcknowledgementsThis study is based on research that the Tennessee Agricultural Experiment Station supported with funding from the USDA National Institute of Food and Agriculture Hatch Multistate Research capacity funding program (Accession Number 1023982) and the USDA National Institute of Food and Agriculture AFRI project (Grant No: 2021-67017-33444).Disclosure statementThe authors declare no conflict of interest.Data availabilityData will be made available on request","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902319","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}

{"title":"Graphene induced carbon-based fibre composite as microwave absorber for X-band frequency application","authors":"Akshita Yadav, Priyanka P. Singh, Ganeswar Nath","doi":"10.1080/08327823.2023.2269494","DOIUrl":"https://doi.org/10.1080/08327823.2023.2269494","url":null,"abstract":"AbstractStealth performance for any microwave absorbing material (MAM) is primarily controlled by the intrinsic characteristic properties of the composition of the composite. The inbuilt property of graphene has enrich the interaction of electromagnetic waves (EMWs) when it is impregnated in its compatible components such as naturally occurring organic materials. The present research engraved with a natural fibre composite with graphene as a stuffing in a resin polymer environment. The powdered form of banana-coconut coir fibre dust with 50–50 wt.% of average particle size of 150 µm with graphene has been fabricated as a hybrid composite of Graphene/Banana-coconut (GN/BNN-CCNT). The surface morphology of the fabricated composite is significantly modified with the addition of graphene creating a sustainable and foam-like elastic skeletal structure for compatibility with EMW. The enhanced dielectric values with different microwave properties for stealth performance are computed. At a frequency of 10.63 GHz a significant −15.68 dB reflection loss is found which comprises of power loss of 97.5% showing the effectiveness of the GN/BNN-CCNT/Epoxy hybrid composite as a stealth material for different X band frequency applications.Keywords: Microwave absorbing materialshybrid compositedielectric propertiesX-band frequency AcknowledgmentThe authors would like to express their appreciation to Science and Technology Department, Govt. of Odisha for sanctioning the Project No.3692/ST and Vice-Chancellor of the Veer Surendra Sai University of Technology, Burla for providing laboratory facilities.Disclosure statementThe author declares no conflict of interest.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902754","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}