Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.385
Sungjin Lee, Dong-Min Kim, Suhyun Kim, Junhwan Lim, Jeongho Lee, Joey Noel, D. Kim
{"title":"A High Efficiency Wireless Power Transfer Drone Coil Structure for\u0000 Interoperability and Robust Misalignment","authors":"Sungjin Lee, Dong-Min Kim, Suhyun Kim, Junhwan Lim, Jeongho Lee, Joey Noel, D. Kim","doi":"10.5515/kjkiees.2023.34.5.385","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.385","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"205 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72540164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigated the method to apply the influence of trees, which are external factors, as a generalized path loss model in the simulation of ray tracing-based electromagnetic analysis inside a building by external electromagnetic waves. The ray tracing method and path loss model, which are electromagnetic wave analysis models used in this study, were described, and the frequencies ranging from 0.6 GHz to 6 GHz were used for electromagnetic wave simulation. The electromagnetic simulation for the target building was performed using Wireless Insite, a commercially available simulation tool based on ray tracing, and a path loss model was applied considering the size and location of trees affecting the experiment in the experimental environment. Finally, the accuracy of the simulation considering the influence of trees was confirmed by comparing the simulation result value applied with the path loss model and the result value obtained through actual experiments.
{"title":"Path Loss Prediction Applying Empirical Model in Civil Buildings with External Trees","authors":"Ki-Tae Park, Han-Hee Lee, Jae-Wook Lee, Jong-Hwa Kwon, Chang-Hee Hyoung, Jung-Hwan Hwang","doi":"10.5515/kjkiees.2023.34.5.399","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.399","url":null,"abstract":"This study investigated the method to apply the influence of trees, which are external factors, as a generalized path loss model in the simulation of ray tracing-based electromagnetic analysis inside a building by external electromagnetic waves. The ray tracing method and path loss model, which are electromagnetic wave analysis models used in this study, were described, and the frequencies ranging from 0.6 GHz to 6 GHz were used for electromagnetic wave simulation. The electromagnetic simulation for the target building was performed using Wireless Insite, a commercially available simulation tool based on ray tracing, and a path loss model was applied considering the size and location of trees affecting the experiment in the experimental environment. Finally, the accuracy of the simulation considering the influence of trees was confirmed by comparing the simulation result value applied with the path loss model and the result value obtained through actual experiments.","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135466153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.377
J. Woo, M. Ju, Sung-Man Kang
{"title":"Evaluation of Induced Voltage by Overhead Power Lines","authors":"J. Woo, M. Ju, Sung-Man Kang","doi":"10.5515/kjkiees.2023.34.5.377","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.377","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"245 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72809713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.354
Jongjin Park, Wonseob Lim, Youngoo Yang
{"title":"Design of a 5.8 GHz GaN HEMT Class-F Rectifier Using Voltage\u0000 Doubler","authors":"Jongjin Park, Wonseob Lim, Youngoo Yang","doi":"10.5515/kjkiees.2023.34.5.354","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.354","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87700846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.424
Chang-Ryul Yun, Dae-Gyu Choi, Kyu-Song Lee
In wideband interferometer direction finding, the inherent non-linearity owing to radome, antenna, and signal polarization can cause non-uniform phase propagation along the incident of the signal, leading to distortion of phase difference between receivers. This affects the accuracy of direction finding, particularly in two-dimensional direction finding where azimuth and elevation are mutually influential. In this study, we proposed a two-dimensional direction finding method to divide the detection range into several areas based on azimuth and elevation axes, select the area through a two-dimensional rough direction finding operation, and perform direction finding by correlation operation in the selected area. In addition, combination azimuth and combination elevation phase differences that are robust against phase delay distortion were used in two-dimensional rough direction operations. This method overcame nonlinear phase transfer characteristics and minimized the increase in error as the incidence angle increased. Performance tests confirmed that the proposed algorithm achieved high accuracy two-dimensional direction finding in a wideband (H/I/J band) system with a measurement error of 1 degree or less in the detection range, even in the presence of nonlinear characteristics of radome/antenna.
{"title":"Wideband High-Precision Multi-Baseline Two-Dimensional Direction Finding Using Combination Phase Differences","authors":"Chang-Ryul Yun, Dae-Gyu Choi, Kyu-Song Lee","doi":"10.5515/kjkiees.2023.34.5.424","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.424","url":null,"abstract":"In wideband interferometer direction finding, the inherent non-linearity owing to radome, antenna, and signal polarization can cause non-uniform phase propagation along the incident of the signal, leading to distortion of phase difference between receivers. This affects the accuracy of direction finding, particularly in two-dimensional direction finding where azimuth and elevation are mutually influential. In this study, we proposed a two-dimensional direction finding method to divide the detection range into several areas based on azimuth and elevation axes, select the area through a two-dimensional rough direction finding operation, and perform direction finding by correlation operation in the selected area. In addition, combination azimuth and combination elevation phase differences that are robust against phase delay distortion were used in two-dimensional rough direction operations. This method overcame nonlinear phase transfer characteristics and minimized the increase in error as the incidence angle increased. Performance tests confirmed that the proposed algorithm achieved high accuracy two-dimensional direction finding in a wideband (H/I/J band) system with a measurement error of 1 degree or less in the detection range, even in the presence of nonlinear characteristics of radome/antenna.","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135466151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.409
Jong Hwa Kwon, Chang Hee Hyoung, Jung-Hwan Hwang, Hyun Ho Park
This study introduced a method for enhancing the shielding effectiveness of an enclosure with apertures using an absorber. The absorber was installed on the inner surface of the aperture of the enclosure and attenuated incident electromagnetic waves as they passed through it. Furthermore, the absorber reduced the standing waves generated inside the enclosure owing to the cavity effect, improving shielding effectiveness. A 3D numerical analysis confirmed that the proposed structure enhanced the shielding effectiveness of the enclosure.
{"title":"Enhancement in Shielding Effectiveness by Electromagnetic Absorbers Applied to Aperture of Metallic Enclosure","authors":"Jong Hwa Kwon, Chang Hee Hyoung, Jung-Hwan Hwang, Hyun Ho Park","doi":"10.5515/kjkiees.2023.34.5.409","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.409","url":null,"abstract":"This study introduced a method for enhancing the shielding effectiveness of an enclosure with apertures using an absorber. The absorber was installed on the inner surface of the aperture of the enclosure and attenuated incident electromagnetic waves as they passed through it. Furthermore, the absorber reduced the standing waves generated inside the enclosure owing to the cavity effect, improving shielding effectiveness. A 3D numerical analysis confirmed that the proposed structure enhanced the shielding effectiveness of the enclosure.","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135466152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.363
Heejae Byun
{"title":"Consistency Test and Improvement of the Spectrum Usage Efficiency\u0000 Evaluation Process","authors":"Heejae Byun","doi":"10.5515/kjkiees.2023.34.5.363","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.363","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89269064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.5515/kjkiees.2023.34.5.337
Mihui Seo, Hyun-ju Kim, Sosu Kim
{"title":"Development of 1 W Class SSPA of a W-Band Compact Pulse Doppler\u0000 Radar","authors":"Mihui Seo, Hyun-ju Kim, Sosu Kim","doi":"10.5515/kjkiees.2023.34.5.337","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.337","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78334369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-01DOI: 10.5515/kjkiees.2023.34.4.303
Young-su Jeon, J. Moon, Se-jun Park, Jin-uk Shin, Byung-sung Kim
{"title":"Design of a Fast Chirp Frequency Synthesizer Using 28-nm CMOS\u0000 Process","authors":"Young-su Jeon, J. Moon, Se-jun Park, Jin-uk Shin, Byung-sung Kim","doi":"10.5515/kjkiees.2023.34.4.303","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.4.303","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88242453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-01DOI: 10.5515/kjkiees.2023.34.4.317
Sohom Bhattacharjee, C. Cho
{"title":"Novel Design of Hollow Coils for TMS to Minimize the Heat without\u0000 Reducing Magnetic Field Intensity","authors":"Sohom Bhattacharjee, C. Cho","doi":"10.5515/kjkiees.2023.34.4.317","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.4.317","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78875133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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