Pub Date : 2023-01-01DOI: 10.1587/transele.2022ecs6003
M. Kishihara, Kaito Fujitani, A. Yamaguchi, Y. Utsumi, I. Ohta
SUMMARY We attempt to design and fabricate of a 4 × 4 Butler matrix for short-millimeter-wave frequencies by using the microfabrication process for a polytetrafluoroethylene (PTFE) substrate-integrated waveguide (SIW) by the synchrotron radiation (SR) direct etching of PTFE and the addition of a metal film by sputter deposition. First, the dimensions of the PTFE SIW using rectangular through-holes for G-band (140-220 GHz) operation are determined, and a cruciform 90 ◦ hybrid coupler and an inter-section circuit are connected by the PTFE SIW to design the Butler matrix. Then, a trial fabrication is performed. Finally, the validity of the design result and the fabrication process is verified by measuring the radiation pattern. key words: microstructure, X-ray lithography, dielectric loaded waveguides
{"title":"Design and Fabrication of PTFE Substrate-Integrated Waveguide Butler Matrix for Short Millimeter Waves","authors":"M. Kishihara, Kaito Fujitani, A. Yamaguchi, Y. Utsumi, I. Ohta","doi":"10.1587/transele.2022ecs6003","DOIUrl":"https://doi.org/10.1587/transele.2022ecs6003","url":null,"abstract":"SUMMARY We attempt to design and fabricate of a 4 × 4 Butler matrix for short-millimeter-wave frequencies by using the microfabrication process for a polytetrafluoroethylene (PTFE) substrate-integrated waveguide (SIW) by the synchrotron radiation (SR) direct etching of PTFE and the addition of a metal film by sputter deposition. First, the dimensions of the PTFE SIW using rectangular through-holes for G-band (140-220 GHz) operation are determined, and a cruciform 90 ◦ hybrid coupler and an inter-section circuit are connected by the PTFE SIW to design the Butler matrix. Then, a trial fabrication is performed. Finally, the validity of the design result and the fabrication process is verified by measuring the radiation pattern. key words: microstructure, X-ray lithography, dielectric loaded waveguides","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78864763","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 : 2023-01-01DOI: 10.1587/transele.2022oms0012
Y. Tominari, Toshiki Yamada, T. Kaji, A. Otomo
SUMMARY We investigated the photochemical stability of an electro-optic (EO) polymer under laser irradiation at 1310 nm to reveal photodegradation mechanisms. It was found that one-photon absorption excitation assisted with the thermal energy at the temperature is involved in the photodegradation process, in contrast to our previous studies at a wavelength of 1550 nm where two-photon absorption excitation is involved in the photodegradation process. Thus, both the excitation wavelength and the thermal energy strongly affect to the degradation mechanism. In any cases, the photodegradation of EO polymers is mainly related to the generation of exited singlet oxygen.
{"title":"Photochemical Stability of Organic Electro-Optic Polymer at 1310-nm Wavelength","authors":"Y. Tominari, Toshiki Yamada, T. Kaji, A. Otomo","doi":"10.1587/transele.2022oms0012","DOIUrl":"https://doi.org/10.1587/transele.2022oms0012","url":null,"abstract":"SUMMARY We investigated the photochemical stability of an electro-optic (EO) polymer under laser irradiation at 1310 nm to reveal photodegradation mechanisms. It was found that one-photon absorption excitation assisted with the thermal energy at the temperature is involved in the photodegradation process, in contrast to our previous studies at a wavelength of 1550 nm where two-photon absorption excitation is involved in the photodegradation process. Thus, both the excitation wavelength and the thermal energy strongly affect to the degradation mechanism. In any cases, the photodegradation of EO polymers is mainly related to the generation of exited singlet oxygen.","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82846526","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 : 2023-01-01DOI: 10.1587/transele.2022ecp5013
William-Fabrice Brou, Quang-Thang Duong, M. Okada
SUMMARY Parallel line feeder (PLF) consisting of a two-wire transmission line operating in the MHz band has been proposed as a wide-coverage short-distance wireless charging. In the MHz band, a PLF of several meters su ff ers from standing wave e ff ect, resulting in fluctuation in power transfer e ffi ciency accordingly to the receiver’s position. This paper studies a modified version of the system, where the PLF is divided into individually compensated segments to mitigate the standing wave e ff ect. Modelling the PLF as a lossy transmission line, this paper theoretically shows that if the segments’ lengths are properly determined, it is able to improve and stabilize the e ffi ciency for all positions. Experimental results at 27.12 MHz confirm the theoretical analysis and show that a fairly high e ffi ciency of 70% can be achieved.
{"title":"Efficiency Analysis for Inductive Power Transfer Using Segmented Parallel Line Feeder","authors":"William-Fabrice Brou, Quang-Thang Duong, M. Okada","doi":"10.1587/transele.2022ecp5013","DOIUrl":"https://doi.org/10.1587/transele.2022ecp5013","url":null,"abstract":"SUMMARY Parallel line feeder (PLF) consisting of a two-wire transmission line operating in the MHz band has been proposed as a wide-coverage short-distance wireless charging. In the MHz band, a PLF of several meters su ff ers from standing wave e ff ect, resulting in fluctuation in power transfer e ffi ciency accordingly to the receiver’s position. This paper studies a modified version of the system, where the PLF is divided into individually compensated segments to mitigate the standing wave e ff ect. Modelling the PLF as a lossy transmission line, this paper theoretically shows that if the segments’ lengths are properly determined, it is able to improve and stabilize the e ffi ciency for all positions. Experimental results at 27.12 MHz confirm the theoretical analysis and show that a fairly high e ffi ciency of 70% can be achieved.","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91030936","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 : 2023-01-01DOI: 10.1587/transele.2022rep0004
Chenxu Wang, H. Kawaguchi, Kota Watanabe
{"title":"Study of FIT Dedicated Computer with Dataflow Architecture for High Performance 2-D Magneto-Static Field Simulation","authors":"Chenxu Wang, H. Kawaguchi, Kota Watanabe","doi":"10.1587/transele.2022rep0004","DOIUrl":"https://doi.org/10.1587/transele.2022rep0004","url":null,"abstract":"","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83666551","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 : 2023-01-01DOI: 10.1587/transele.2022ecp5037
Umer Farooq, M. Mori, K. Maezawa
{"title":"Experimental Characterization of Resonant Tunneling Chaos Generator Circuits in Microwave Frequency Range","authors":"Umer Farooq, M. Mori, K. Maezawa","doi":"10.1587/transele.2022ecp5037","DOIUrl":"https://doi.org/10.1587/transele.2022ecp5037","url":null,"abstract":"","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84650993","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 : 2023-01-01DOI: 10.1587/transele.2022ecp5055
Ming Ni, Yan Han, R. Cheung, Xuemeng Zhou
{"title":"Design of a Hippocampal Cognitive Prosthesis Chip","authors":"Ming Ni, Yan Han, R. Cheung, Xuemeng Zhou","doi":"10.1587/transele.2022ecp5055","DOIUrl":"https://doi.org/10.1587/transele.2022ecp5055","url":null,"abstract":"","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81716945","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 : 2023-01-01DOI: 10.1587/transele.2022oms0007
M. Ikeda, S. Imai
{"title":"Basic Study of Micro-Pumps for Medication Driven by Chemical Reactions","authors":"M. Ikeda, S. Imai","doi":"10.1587/transele.2022oms0007","DOIUrl":"https://doi.org/10.1587/transele.2022oms0007","url":null,"abstract":"","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75792962","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 : 2023-01-01DOI: 10.1587/transele.2022rep0001
K. Goto, T. Kawano
{"title":"An Interpretation Method on Amplitude Intensities for Response Waveforms of Backward Transient Scattered Field Components by a 2-D Coated Metal Cylinder","authors":"K. Goto, T. Kawano","doi":"10.1587/transele.2022rep0001","DOIUrl":"https://doi.org/10.1587/transele.2022rep0001","url":null,"abstract":"","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86017329","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 : 2023-01-01DOI: 10.1587/transele.2022ecs6002
T. Yasui, J. Sugisaka, K. Hirayama
SUMMARY In this study, the bending losses of chalcogenide glass channel optical waveguides consisting of an As 2 Se 3 core and an As 2 S 3 lower cladding layer were numerically evaluated across the astronomical N -band, which is the mid-infrared spectral range between the 8 μ m and 12 μ m wavelengths. The results reveal the design rules for bent waveguides in mid-infrared astrophotonic devices.
{"title":"Bending Loss Analysis of Chalcogenide Glass Channel Waveguides for Mid-Infrared Astrophotonic Devices","authors":"T. Yasui, J. Sugisaka, K. Hirayama","doi":"10.1587/transele.2022ecs6002","DOIUrl":"https://doi.org/10.1587/transele.2022ecs6002","url":null,"abstract":"SUMMARY In this study, the bending losses of chalcogenide glass channel optical waveguides consisting of an As 2 Se 3 core and an As 2 S 3 lower cladding layer were numerically evaluated across the astronomical N -band, which is the mid-infrared spectral range between the 8 μ m and 12 μ m wavelengths. The results reveal the design rules for bent waveguides in mid-infrared astrophotonic devices.","PeriodicalId":13259,"journal":{"name":"IEICE Trans. Electron.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90259583","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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