Pub Date : 2023-06-01DOI: 10.5515/kjkiees.2023.34.6.466
Hyo-gyun Kim, Gyeong-Ryun Choi, Sungsoo Choi, Young-gi Hong, Joosung Hwang, Chan-Kyu Kim, W. Nah
{"title":"Characteristics of BCI-Monitoring Probe System Using\u0000 Electro-Magnetic Field Simulation","authors":"Hyo-gyun Kim, Gyeong-Ryun Choi, Sungsoo Choi, Young-gi Hong, Joosung Hwang, Chan-Kyu Kim, W. Nah","doi":"10.5515/kjkiees.2023.34.6.466","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.6.466","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78225213","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 : 2023-06-01DOI: 10.5515/kjkiees.2023.34.6.450
Jong-In Choi, Bom-Son Lee
In this study, we present a 4T (transmit) 4R (receive) base station antenna for 5G. Furthermore we design, manufacture, and analyze phase-adjustable antennas that allow four RF signals supplied from the base station equipment to match the phase of each of the four ports of the antenna. The bandwidth was designed based on the 5G band (3,400~3,700 MHz) used by three mobile telecommunication companies. The radiation element of the antenna is configured to supply power to four ports consisting of two columns of dual polarization 10 arrays. Each transmission line fed to the four ports has a phase controller that can control the phase of the port, and each transmission line that has passed through it includes a module that includes a coupler that separates small signals and a coupler to combine into one. The combined signal was connected to a connector for signal detection outside the antenna and used as a test port. Using this configuration, the phase of the signal supplied from the base station equipment to each port of the antenna can be adjusted equally, and the phase difference for each port can be realized within 5°. Thus, separate services for each port and combined services of the ports were freely implemented without significant loss to enable beamforming.
{"title":"Phase Adjustable 4T4R Sector Antenna for 5G","authors":"Jong-In Choi, Bom-Son Lee","doi":"10.5515/kjkiees.2023.34.6.450","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.6.450","url":null,"abstract":"In this study, we present a 4T (transmit) 4R (receive) base station antenna for 5G. Furthermore we design, manufacture, and analyze phase-adjustable antennas that allow four RF signals supplied from the base station equipment to match the phase of each of the four ports of the antenna. The bandwidth was designed based on the 5G band (3,400~3,700 MHz) used by three mobile telecommunication companies. The radiation element of the antenna is configured to supply power to four ports consisting of two columns of dual polarization 10 arrays. Each transmission line fed to the four ports has a phase controller that can control the phase of the port, and each transmission line that has passed through it includes a module that includes a coupler that separates small signals and a coupler to combine into one. The combined signal was connected to a connector for signal detection outside the antenna and used as a test port. Using this configuration, the phase of the signal supplied from the base station equipment to each port of the antenna can be adjusted equally, and the phase difference for each port can be realized within 5°. Thus, separate services for each port and combined services of the ports were freely implemented without significant loss to enable beamforming.","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135046020","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 : 2023-06-01DOI: 10.5515/kjkiees.2022.34.6.477
Tae-Hyung Kim, Junehyune Park, Joon-Tae Park, Myoung-Il Kang, Hang-Soo Lee
{"title":"Study on the Precise Measurement of Sea Level Altitude of Monopulse\u0000 Radar on a Ship","authors":"Tae-Hyung Kim, Junehyune Park, Joon-Tae Park, Myoung-Il Kang, Hang-Soo Lee","doi":"10.5515/kjkiees.2022.34.6.477","DOIUrl":"https://doi.org/10.5515/kjkiees.2022.34.6.477","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86103699","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 : 2023-06-01DOI: 10.5515/kjkiees.2023.34.6.477
Tae-Hyung Kim, June-Hyune Park, Joon-Tae Park, Myoung-Il Kang, Hang-Soo Lee
Some monopulse radars on a ship require an altitude value of the radar relative to the sea level with error levels of several tens of centimeters (cm). In conventional methods, it is difficult to frequently measure the radar altitude relative to the sea level, which changes according to ship conditions, while maintaining error levels of several tens of centimeters. In this study, a monopulse radar irradiates a radar beam, measures the distance from the radar to the sea surface at the beam irradiation position, and presents a method for precisely measuring the radar altitude by considering the radar mounting error. The proposed method can be operated whenever necessary in a radar operating environment. We analyzed and verified the performance of the proposed method using simulations.
{"title":"Study on the Precise Measurement of Sea Level Altitude of Monopulse Radar on a Ship","authors":"Tae-Hyung Kim, June-Hyune Park, Joon-Tae Park, Myoung-Il Kang, Hang-Soo Lee","doi":"10.5515/kjkiees.2023.34.6.477","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.6.477","url":null,"abstract":"Some monopulse radars on a ship require an altitude value of the radar relative to the sea level with error levels of several tens of centimeters (cm). In conventional methods, it is difficult to frequently measure the radar altitude relative to the sea level, which changes according to ship conditions, while maintaining error levels of several tens of centimeters. In this study, a monopulse radar irradiates a radar beam, measures the distance from the radar to the sea surface at the beam irradiation position, and presents a method for precisely measuring the radar altitude by considering the radar mounting error. The proposed method can be operated whenever necessary in a radar operating environment. We analyzed and verified the performance of the proposed method using simulations.","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135046262","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.2022.34.5.399
Ki-Tae Park, Han-Hee Lee, Jae-Wook Lee, J. Kwon, Changhee Hyoung, Junghwan Hwang
{"title":"Path Loss Prediction Applying Empirical Model in Civil Buildings\u0000 with External Trees","authors":"Ki-Tae Park, Han-Hee Lee, Jae-Wook Lee, J. Kwon, Changhee Hyoung, Junghwan Hwang","doi":"10.5515/kjkiees.2022.34.5.399","DOIUrl":"https://doi.org/10.5515/kjkiees.2022.34.5.399","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"39 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89150380","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.2023.34.5.345
Sunghun Jung, Yonghwan Kim, Hye-Rin Choi, Daegyu Choi, Kyu-Song Lee
{"title":"Design and Implementation of Ultra-Wideband Frequency Synthesizer\u0000 Using DDS","authors":"Sunghun Jung, Yonghwan Kim, Hye-Rin Choi, Daegyu Choi, Kyu-Song Lee","doi":"10.5515/kjkiees.2023.34.5.345","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.345","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":"85586297","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.2022.34.5.424
Chang-Ryul Yun, Dae-Gyu Choi, Kyu-Song Lee
{"title":"Wideband High-Precision Multi-Baseline Two-Dimensional Direction\u0000 Finding Using Combination Phase Differences","authors":"Chang-Ryul Yun, Dae-Gyu Choi, Kyu-Song Lee","doi":"10.5515/kjkiees.2022.34.5.424","DOIUrl":"https://doi.org/10.5515/kjkiees.2022.34.5.424","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82456821","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.2023.34.5.331
Daeun Choi, Jieun Han, Dongho Kim
{"title":"Gain Enhanced Fabry-Perot Cavity Antenna by Changing the Source\u0000 Feeding Position","authors":"Daeun Choi, Jieun Han, Dongho Kim","doi":"10.5515/kjkiees.2023.34.5.331","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.331","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83886134","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.2022.34.5.409
J. Kwon, Changhee Hyoung, Junghwan Hwang, Hyunho Park
{"title":"Enhancement in Shielding Effectiveness by Electromagnetic Absorbers\u0000 Applied to Aperture of Metallic Enclosure","authors":"J. Kwon, Changhee Hyoung, Junghwan Hwang, Hyunho Park","doi":"10.5515/kjkiees.2022.34.5.409","DOIUrl":"https://doi.org/10.5515/kjkiees.2022.34.5.409","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"387 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76448058","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.2023.34.5.415
Myung-Hoon Park, Woo-Joong Jeon, Hyun-Wook Moon, Se-Woong Kwon, Sang-Hyun Kim, Ki-Won Lee
{"title":"Analysis of Radar Performance Using Measured Domestic Atmospheric\u0000 Data","authors":"Myung-Hoon Park, Woo-Joong Jeon, Hyun-Wook Moon, Se-Woong Kwon, Sang-Hyun Kim, Ki-Won Lee","doi":"10.5515/kjkiees.2023.34.5.415","DOIUrl":"https://doi.org/10.5515/kjkiees.2023.34.5.415","url":null,"abstract":"","PeriodicalId":55817,"journal":{"name":"Journal of the Korean Institute of Electromagnetic Engineering and Science","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76696655","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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