Electronics and Communications in Japan (Part II: Electronics)最新文献_第10页

Rectangular waveguide compatible NRD guide gunn oscillator with medium power and low phase noise at 60 GHz 60 GHz下中功率、低相位噪声的矩形波导兼容NRD波导振荡器

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20290

Futoshi Kuroki, Ko-Ichi Yamaoka, Hiroshi Shimoi, Tsukasa Yoneyama

引用次数: 8

Analysis of ring filter and its cascade synthesis method 环形滤波器的分析及其级联合成方法

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20298

Hitoshi Ishida, Kiyomichi Araki

{"title":"Analysis of ring filter and its cascade synthesis method","authors":"Hitoshi Ishida, Kiyomichi Araki","doi":"10.1002/ecjb.20298","DOIUrl":"10.1002/ecjb.20298","url":null,"abstract":"A ring resonator filter with a stub (ring filter) has a band-stop filter characteristic. The attenuation frequencies are at two symmetric locations with respect to the center frequency of the passband. If the range between these two attenuation frequencies is considered as the passband, the loss is low and the group delay is constant in the passband region. In the present paper, the condition of the ripple generation in the passband is derived for the ring filter. Further, the ripple frequencies under the ripple generation conditions are numerically obtained and compared with the measured results. Next, the passband group delay is analytically derived and compared with the measured value. Further, a method of cascading the ring filters is studied. It is found that the transfer function of the cascaded ring filter is expressed in terms of a rational function of the Richard variable . It is shown that a set of the characteristic impedances realizing the desired rational function can be inversely calculated. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(3): 9–16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20298","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 3","pages":"9-16"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20298","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90480528","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}

引用次数: 1

Consideration of optimum resistance values of MTJ in multilayered MRAM with various detection methods 多种检测方法对多层MRAM中MTJ最佳电阻值的考虑

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20265

Fumio Horiguchi, Hiroaki Yoda, Shuichi Tahara

引用次数: 0

A study on high-efficiency short-wave AM transmitter 高效短波调幅发射机的研究

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20283

Masahiko Yamazoe, Kazuhisa Haeiwa, Kazuaki Wakai, Tomohide Kakutani

{"title":"A study on high-efficiency short-wave AM transmitter","authors":"Masahiko Yamazoe, Kazuhisa Haeiwa, Kazuaki Wakai, Tomohide Kakutani","doi":"10.1002/ecjb.20283","DOIUrl":"10.1002/ecjb.20283","url":null,"abstract":"In a short-wave (3 to 30 MHz) high-power transmitter, the modulation section is fabricated with semiconductors, but the total semiconductor realization including the final-stage PA is difficult and has not been accomplished to date. The authors' objective is to achieve total use of semiconductors for realization of a 100-kW-class short-wave high-power transmitter. An optimal power device (MOSFET) to obtain high efficiency is selected. In addition, a circuit for realization of high efficiency and a synthesis method for excellent linearity are proposed. In the short-wave band, there is a problem of increased loss due to parasitic diodes for the digital-processing AM modulation device used in the middle-frequency range. It is shown that the method cannot be applied directly. Further, an optimum modulation format and a circuit configuration for realization of a short-wave high-efficiency AM transmitter are proposed. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(3): 33–41, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20283","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 3","pages":"33-41"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20283","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76667475","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}

引用次数: 4

Evaluation method of high-permittivity materials in microwave region using coplanar waveguide 微波区高介电常数材料的共面波导评价方法

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20296

Masatoshi Tsuji, Shotaro Tsuda, Toshio Nishikawa, Kikuo Wakino, Toshihide Kitazawa

{"title":"Evaluation method of high-permittivity materials in microwave region using coplanar waveguide","authors":"Masatoshi Tsuji, Shotaro Tsuda, Toshio Nishikawa, Kikuo Wakino, Toshihide Kitazawa","doi":"10.1002/ecjb.20296","DOIUrl":"10.1002/ecjb.20296","url":null,"abstract":"This paper proposes a novel evaluation method for dielectric characteristics of ceramic substrates made of high-permittivity material, (Ba, Sr)TiO3 (BST), in the microwave region. The dielectric characteristics are obtained accurately and simply by measuring S-parameter and by full-wave analysis for coplanar waveguide (CPW) composed on the substrate. Only the measurement of S21 response of the CPW is required for evaluation. The effective permittivity (εeff) and attenuation constant (α) are calculated from the S21 data. Relative permittivity (εr) and tanδ of substrate material are estimated by relating the εeff and α quantitatively with their simulated values calculated by the Extended Spectral Domain Approach (ESDA) taking the thickness effect of the conductor into consideration. Three kinds of BST substrates with different Ba to Sr ratios were measured as test samples. The estimated εr's of Ba0.3Sr0.7TiO3, Ba0.5Sr0.5TiO3, and Ba0.7Sr0.3TiO3 were 662, 1650, and 4450, respectively. These εr's decrease slightly as the frequency increases. The estimated errors for the εr's are estimated to be less than 0.3%. This method is useful for the evaluation even of a small variation of dielectric constant in high-permittivity materials. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(3): 17–25, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20296","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 3","pages":"17-25"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76222499","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}

引用次数: 2

Micropatterning of 2D colloidal crystals using area-selective immobilization of particles by laser beam irradiation onto azopolymer surface 激光照射偶氮聚合物表面，用区域选择性固定粒子制备二维胶体晶体微图案化

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-02-20 DOI: 10.1002/ecjb.20307

Takahiro Kato, Masahiro Tawata, Hiroshi Shimoyama, Taiji Ikawa, Osamu Watanabe

{"title":"Micropatterning of 2D colloidal crystals using area-selective immobilization of particles by laser beam irradiation onto azopolymer surface","authors":"Takahiro Kato, Masahiro Tawata, Hiroshi Shimoyama, Taiji Ikawa, Osamu Watanabe","doi":"10.1002/ecjb.20307","DOIUrl":"10.1002/ecjb.20307","url":null,"abstract":"We proposed a technique which arranges particles in a regular two-dimensional array on an azopolymer surface, followed by immobilizing them in an arbitrary pattern on the surface, and studied its prospect. Azopolymer has the two properties of being able “to form a surface relief structure” and “to immobilize particles in the surface” by light irradiation. First, the former characteristic was used to form a periodic two-dimensional relief pattern template on an azopolymer surface by two-beam interference exposure, and the particles were arranged on the surface. Then the latter characteristic was used to selectively immobilize particles by light irradiation, and unimmobilized particles were removed by washing. As a result, we demonstrated that particles could be arranged in a regular two-dimensional array in a square structure and a hexagonal structure, and a two-dimensional photonic crystal waveguide structure could be easily fabricated by the micropatterning of particles. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(3): 1–8, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20307","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 3","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2007-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20307","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79695644","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}

引用次数: 0

A process for fabricating flexible reflective display devices using a composite film of ferroelectric liquid crystal and polymer 一种利用铁电液晶和聚合物的复合薄膜制造柔性反射显示装置的方法

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-01-10 DOI: 10.1002/ecjb.20192

Hiroto Sato, Hideo Fujikake, Takeshi Murashige, Hiroshi Kikuchi, Taiichiro Kurita, Fumio Sato

{"title":"A process for fabricating flexible reflective display devices using a composite film of ferroelectric liquid crystal and polymer","authors":"Hiroto Sato, Hideo Fujikake, Takeshi Murashige, Hiroshi Kikuchi, Taiichiro Kurita, Fumio Sato","doi":"10.1002/ecjb.20192","DOIUrl":"10.1002/ecjb.20192","url":null,"abstract":"We have developed a process for fabricating flexible reflective display devices using thin composite films of aligned polymer-monostabilized ferroelectric liquid crystals encased between plastic substrates. In order to precisely control the thickness of these films, photolithography is used to fabricate spacer posts on a substrate, and a printing technique that can form a liquid crystal/monomer solution film on the substrate uniformly. Control voltages are applied to the layer via transparent electrodes; in order to prevent a short circuit between these electrodes, an insulator layer is also formed on the other substrate. Once the two substrates are attached to one another, polymer walls and fibers are created in the liquid crystal layer between the two substrates by photopolymerization-induced phase separation which was induced by two-step exposure of ultraviolet light. A fabricated device is sandwiched between a polarizer and a diffuse mirror to make a reflective display. Uniform display operation was obtained when the device was driven with a voltage, even when the device was bent with a 5-cm radius of curvature. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(2): 33 – 39, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20192 Copyright © 2004 Wiley Periodicals, Inc.","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 2","pages":"33-39"},"PeriodicalIF":0.0,"publicationDate":"2007-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84578720","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}

引用次数: 2

A neural circuit model forming semantic memory from episodic memory using STDP 基于STDP的情景记忆形成语义记忆的神经回路模型

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-01-10 DOI: 10.1002/ecjb.20332

Yusaku Kobayashi, Kazushi Murakoshi

{"title":"A neural circuit model forming semantic memory from episodic memory using STDP","authors":"Yusaku Kobayashi, Kazushi Murakoshi","doi":"10.1002/ecjb.20332","DOIUrl":"10.1002/ecjb.20332","url":null,"abstract":"The role of memory is important for human high-order functions such as thought, motion, and recognition. From many kinds of memory, this paper focuses on semantic memory and episodic memory which are declarative. It is thought that semantic memory is formed from common part of episodic memories. Though it is clarified which part of the brain is related to semantic memory, the neural circuit has not been clarified, especially concerning STDP which is minute learning regulation in time. We propose a neural circuit model forming semantic memory from episodic memory using STDP. By changing connections and input patterns in the model, we have examined the appropriate conditions by which semantic memory can be formed. The results show that three input routes, recurrent input, and appropriate propagation delay are necessary for forming semantic memory. Moreover, we have experimented forming a semantic memory after forming another semantic memory. The result shows that our model is able to form a semantic network. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(2): 54–63, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20332","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 2","pages":"54-63"},"PeriodicalIF":0.0,"publicationDate":"2007-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20332","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89868065","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}

引用次数: 2

Vision-based human motion tracking using head-mounted cameras and fixed cameras 使用头戴式摄像机和固定摄像机的基于视觉的人体运动跟踪

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-01-10 DOI: 10.1002/ecjb.20331

Hirotake Yamazoe, Akira Utsumi, Nobuji Tetsutani, Masahiko Yachida

{"title":"Vision-based human motion tracking using head-mounted cameras and fixed cameras","authors":"Hirotake Yamazoe, Akira Utsumi, Nobuji Tetsutani, Masahiko Yachida","doi":"10.1002/ecjb.20331","DOIUrl":"10.1002/ecjb.20331","url":null,"abstract":"In this paper, we propose a method to track human motions by using multiple-viewpoint images taken by both mobile cameras and fixed-viewpoint cameras. In a vision-based system, the variety of viewpoints is important for effective detection/tracking of target motions. As image sequences observed from various viewpoints contain rich information regarding entire scenes, these images are also useful for video-based analysis of human behaviors/interactions. We employ multiple numbers of mobile cameras mounted on human heads and fixed-viewpoint cameras to observe a human interaction scene. In our method, 3D human positions are tracked by using both mobile and fixed-viewpoint camera images. Transitions of human and background positions in images are estimated by using the tracked 3D positions, and the positions and poses of the mobile camera are determined by comparing the observed images with the estimation. Consequently, our method can provide position information for all humans and head motions for the humans wearing head-mounted cameras. Experimental results show the effectiveness of the proposed method. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 90(2): 40–53, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20331","PeriodicalId":100406,"journal":{"name":"Electronics and Communications in Japan (Part II: Electronics)","volume":"90 2","pages":"40-53"},"PeriodicalIF":0.0,"publicationDate":"2007-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ecjb.20331","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84201091","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}

引用次数: 7

A microstrip-line phase shifter constructed by a tunable filter 由可调谐滤波器构成的微带线移相器

Electronics and Communications in Japan (Part II: Electronics) Pub Date : 2007-01-10 DOI: 10.1002/ecjb.20253

Daisuke Morikawa, Hiroyuki Deguchi, Mikio Tsuji, Hiroshi Shigesawa

引用次数: 5