Pub Date : 2013-05-15DOI: 10.1109/ECTICON.2013.6559625
K. Thongkor, T. Amornraksa
This paper addresses a problem of detecting watermark signal from watermarked printed image behind a glassy object. By considering a situation where an image owner tries to extract his/her embedded watermark from a camera-captured image having unauthorized image inside, such image will always include RST (rotation, scaling, and translation) and perspective distortions from the processes of printing and camera-capturing, which consequently affect the accuracy of the extracted watermark. The situation becomes worse when the image is captured through the glassy object, and some lights reflect off the glass surface. In this paper, we thus propose a method to extract a watermark from a camera-captured image contained partially glass reflection. Basically, the image alignment technique based on projective transformation is applied to diminish both RST and perspective distortions due to printing and camera-capturing processes. Next, undesirable reflection reduction technique based on gradient field is introduced to reduce unwanted reflection in the cameracaptured image, before performing the watermark estimation sub process. The experimental results show effectiveness of our proposed method and possibility to implement it in other watermarking schemes.
{"title":"Image watermark extraction for captured image with partially glass reflection","authors":"K. Thongkor, T. Amornraksa","doi":"10.1109/ECTICON.2013.6559625","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559625","url":null,"abstract":"This paper addresses a problem of detecting watermark signal from watermarked printed image behind a glassy object. By considering a situation where an image owner tries to extract his/her embedded watermark from a camera-captured image having unauthorized image inside, such image will always include RST (rotation, scaling, and translation) and perspective distortions from the processes of printing and camera-capturing, which consequently affect the accuracy of the extracted watermark. The situation becomes worse when the image is captured through the glassy object, and some lights reflect off the glass surface. In this paper, we thus propose a method to extract a watermark from a camera-captured image contained partially glass reflection. Basically, the image alignment technique based on projective transformation is applied to diminish both RST and perspective distortions due to printing and camera-capturing processes. Next, undesirable reflection reduction technique based on gradient field is introduced to reduce unwanted reflection in the cameracaptured image, before performing the watermark estimation sub process. The experimental results show effectiveness of our proposed method and possibility to implement it in other watermarking schemes.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"68 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134195579","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559545
Kunio Horiba, A. Mokhtari, Tota Mizuno, M. Uchida
Tactile sense as one of the five regular senses of human body has always been considered as an efficient substitution for the other senses of body such as sight and hearing. For example, a tactile interface system is able to transfer an essential set of information by using the tactile sense instead of visual or hearing sense. Today we can see the various applications of this substitution in different interface and interactive display systems that are helping people specially the physically challenged ones to perform many of their daily tasks despite of a loss in one of their sensory organs [1]. The concept of tactile apparent movement recognition that have boon considered in this research is normally a subjective sense of human body. The term apparent movement refers to the illusory perception of a movement on skin that is created by the discrete stimulations of a number of points on skin of a part of body that are appropriately separated in space and time and can be controlled by different parameters. These parameters have been studied particularly in this research. Applying the tactile apparent movement to an individually defined engineering system, a quantitative evaluation study becomes necessary and possible. In previous studies, finding the body-sway (testing arm of an experiment subject) caused by the tactile apparent movement in a fixed experimental condition became possible. However, characteristic of the body-sway that appeared in the experiment was not thoroughly investigated. In this study, investigating the body-sway caused by tactile apparent movement in a fixed experimental condition was aimed. Therefore, we focused on 3 group of information; the biological information, the body-sway and the information that resulted from the comparison between the apparent movement recognized trials and the non-recognized trials. The EMG data recorded under particular tactile stimuli was analyzed by performing the time-to-frequency transform tools as the short-time Fourier transform (STFT). The findings of this research will be conducive to optimize the performance of the systems that are using the tactile apparent movement.
{"title":"EMG analysis and evaluation of body-sway evoked by tactile stimuli","authors":"Kunio Horiba, A. Mokhtari, Tota Mizuno, M. Uchida","doi":"10.1109/ECTICON.2013.6559545","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559545","url":null,"abstract":"Tactile sense as one of the five regular senses of human body has always been considered as an efficient substitution for the other senses of body such as sight and hearing. For example, a tactile interface system is able to transfer an essential set of information by using the tactile sense instead of visual or hearing sense. Today we can see the various applications of this substitution in different interface and interactive display systems that are helping people specially the physically challenged ones to perform many of their daily tasks despite of a loss in one of their sensory organs [1]. The concept of tactile apparent movement recognition that have boon considered in this research is normally a subjective sense of human body. The term apparent movement refers to the illusory perception of a movement on skin that is created by the discrete stimulations of a number of points on skin of a part of body that are appropriately separated in space and time and can be controlled by different parameters. These parameters have been studied particularly in this research. Applying the tactile apparent movement to an individually defined engineering system, a quantitative evaluation study becomes necessary and possible. In previous studies, finding the body-sway (testing arm of an experiment subject) caused by the tactile apparent movement in a fixed experimental condition became possible. However, characteristic of the body-sway that appeared in the experiment was not thoroughly investigated. In this study, investigating the body-sway caused by tactile apparent movement in a fixed experimental condition was aimed. Therefore, we focused on 3 group of information; the biological information, the body-sway and the information that resulted from the comparison between the apparent movement recognized trials and the non-recognized trials. The EMG data recorded under particular tactile stimuli was analyzed by performing the time-to-frequency transform tools as the short-time Fourier transform (STFT). The findings of this research will be conducive to optimize the performance of the systems that are using the tactile apparent movement.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131017282","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559532
Sirinapa Buayairaksa, Somchai Thepphaeng, C. Pirak
The power line communication (PLC) plays an important role in the evolvement of communication network technology in the advanced metering infrastructure (AMI). With existing power lines, PLC enables the provision of automatic controlling smart energy meter service. In this paper, we examine the performance of G3 PLC network with smart energy meter. Essentially, a network topology, a communication protocol, and a data rate are studied in real environment. Experimental results indicate that the investigated G3 PLC technology could achieve a preferable performance in terms of network reliability and throughput. Hence, this technology could be one of prominent PLC technologies for realizing the AMI systems.
{"title":"On the performance of G3 power line communication network with smart energy meter","authors":"Sirinapa Buayairaksa, Somchai Thepphaeng, C. Pirak","doi":"10.1109/ECTICON.2013.6559532","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559532","url":null,"abstract":"The power line communication (PLC) plays an important role in the evolvement of communication network technology in the advanced metering infrastructure (AMI). With existing power lines, PLC enables the provision of automatic controlling smart energy meter service. In this paper, we examine the performance of G3 PLC network with smart energy meter. Essentially, a network topology, a communication protocol, and a data rate are studied in real environment. Experimental results indicate that the investigated G3 PLC technology could achieve a preferable performance in terms of network reliability and throughput. Hence, this technology could be one of prominent PLC technologies for realizing the AMI systems.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"62 23","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133087150","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559489
N. Phloymuk, A. Pruksanubal, N. Tanthanuch
This paper presents the breakdown voltage characteristics of a non-uniform electric field affected by the insertion of solid dielectric barrier under air atmosphere. The investigations have been done experimentally and simulated in order to study the surface breakdown phenomenon of solid dielectric barrier. According to the experiments, the results are divided into two parts. The first part is the pressure and the polarity effects on breakdown voltage. The results show the breakdown voltage increase when air pressure are increase and the intersection between the positive and negative DC breakdown curves at the pressure of 1.5 bars, which is supposed to be critical pressure. At the pressure lower than 1.5 bars, the negative DC breakdown voltage is lower than the positive case. In the other hand, the negative DC breakdown voltage is higher than the positive case at the pressure higher than 1.5 bars. The second part is the simulation results of electric field distribution with solid dielectric barrier, which is numerically analysed by Finite Element Method (FEM). It can be described that in case of the thicker solid barrier, the electric field stress at the contact point is lower than the one with thinner barrier. That means the higher applied voltage will be needed to increase the ionization process. Therefore for the thicker solid barrier, the higher voltage must be applied to raise the electric field strength at the contact point to reach the breakdown condition.
{"title":"Investigations on breakdown voltage of solid barrier under non-uniform electric field simulation and experiment","authors":"N. Phloymuk, A. Pruksanubal, N. Tanthanuch","doi":"10.1109/ECTICON.2013.6559489","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559489","url":null,"abstract":"This paper presents the breakdown voltage characteristics of a non-uniform electric field affected by the insertion of solid dielectric barrier under air atmosphere. The investigations have been done experimentally and simulated in order to study the surface breakdown phenomenon of solid dielectric barrier. According to the experiments, the results are divided into two parts. The first part is the pressure and the polarity effects on breakdown voltage. The results show the breakdown voltage increase when air pressure are increase and the intersection between the positive and negative DC breakdown curves at the pressure of 1.5 bars, which is supposed to be critical pressure. At the pressure lower than 1.5 bars, the negative DC breakdown voltage is lower than the positive case. In the other hand, the negative DC breakdown voltage is higher than the positive case at the pressure higher than 1.5 bars. The second part is the simulation results of electric field distribution with solid dielectric barrier, which is numerically analysed by Finite Element Method (FEM). It can be described that in case of the thicker solid barrier, the electric field stress at the contact point is lower than the one with thinner barrier. That means the higher applied voltage will be needed to increase the ionization process. Therefore for the thicker solid barrier, the higher voltage must be applied to raise the electric field strength at the contact point to reach the breakdown condition.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132697280","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559492
K. Bunjongjit, Y. Kumsuwan
This paper presents a performance enhancement of a permanent magnet synchronous generator (PMSG) system with control of generator-side converter for a wind turbine application. This method uses zero d-axis stator current control to minimize winding losses of the generator. The electromagnetic torque of the generator is correlated with the magnitude of the q-axis stator current, while the d-axis stator current is regulated at zero, the control scheme decouples dq-axis stator current control through vector control for the generator-side converter. This paper also presents mathematical analysis of the active power and stator power factor, and the maximum power point tracking (MPPT) operation. Simulation results are provided to guarantee the proposed control scheme, in which the performance enhancement and efficiency.
{"title":"Performance enhancement of PMSG systems with control of generator-side converter using d-axis stator current controller","authors":"K. Bunjongjit, Y. Kumsuwan","doi":"10.1109/ECTICON.2013.6559492","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559492","url":null,"abstract":"This paper presents a performance enhancement of a permanent magnet synchronous generator (PMSG) system with control of generator-side converter for a wind turbine application. This method uses zero d-axis stator current control to minimize winding losses of the generator. The electromagnetic torque of the generator is correlated with the magnitude of the q-axis stator current, while the d-axis stator current is regulated at zero, the control scheme decouples dq-axis stator current control through vector control for the generator-side converter. This paper also presents mathematical analysis of the active power and stator power factor, and the maximum power point tracking (MPPT) operation. Simulation results are provided to guarantee the proposed control scheme, in which the performance enhancement and efficiency.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127418991","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559656
D. Srimoon
This paper presents an E-shaped flat dipole on an U-shaped cross-sectional ground plane. Dipole contributes from copper on the surface of FR4 to form the E-shaped. It is fed by a 50 Ohms coaxial cable. The frequency ranges is 1.5 - 2.8 GHz with return loss <;-15 dB. The antenna provides an average gain of 7.0 dBi and HPBW of 96 degree in the horizon plan and 62 degree in the vertical plan. The front-to-back ratio is greater than 18 dB on the U-shaped ground plane width of 160 mm, length of 110 mm and height of 40 mm. This antenna is suitable to use as a base station antenna with a linear polarization for DCS, PCS, UMTS and ISM bands. It is also the low-cost antenna.
{"title":"An E-shaped flat dipole on an U-shaped cross-sectional ground plane","authors":"D. Srimoon","doi":"10.1109/ECTICON.2013.6559656","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559656","url":null,"abstract":"This paper presents an E-shaped flat dipole on an U-shaped cross-sectional ground plane. Dipole contributes from copper on the surface of FR4 to form the E-shaped. It is fed by a 50 Ohms coaxial cable. The frequency ranges is 1.5 - 2.8 GHz with return loss <;-15 dB. The antenna provides an average gain of 7.0 dBi and HPBW of 96 degree in the horizon plan and 62 degree in the vertical plan. The front-to-back ratio is greater than 18 dB on the U-shaped ground plane width of 160 mm, length of 110 mm and height of 40 mm. This antenna is suitable to use as a base station antenna with a linear polarization for DCS, PCS, UMTS and ISM bands. It is also the low-cost antenna.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115498085","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559659
Komkris Boonying Chuwong Phongcharoenpanich, S. Kosulvit
This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the |S11| are -14.7 dB and -23.2 dB, respectively. The radiation pattern of the proposed antenna radiates unidirectional beam with vertical polarization for both bands. The half-power beamwidths at 922.5 MHz in XZ-plane and XY-plane are 63.4 ° and 80.1 °, whereas ones at 2.45 GHz in XZ-plane and XY-plane are 35.5 ° and 57.6 °, respectively. The measured gain is higher than 5 dBi at both frequencies.
{"title":"Dual-band circular plate antenna with annular-ring slot and four-paired rectangular slots","authors":"Komkris Boonying Chuwong Phongcharoenpanich, S. Kosulvit","doi":"10.1109/ECTICON.2013.6559659","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559659","url":null,"abstract":"This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the |S11| are -14.7 dB and -23.2 dB, respectively. The radiation pattern of the proposed antenna radiates unidirectional beam with vertical polarization for both bands. The half-power beamwidths at 922.5 MHz in XZ-plane and XY-plane are 63.4 ° and 80.1 °, whereas ones at 2.45 GHz in XZ-plane and XY-plane are 35.5 ° and 57.6 °, respectively. The measured gain is higher than 5 dBi at both frequencies.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115916385","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559660
Chamaiporn Ratnaratorn, Norakamon Wongsin, C. Mahatthanajatuphat, P. Akkaraekthalin
A multiband wide slotted antenna with Hilbert fractal slot on rectangular patch is presented. By using a wide slotted structure, a Hilbert fractal slot with 1st iterations in rectangular patch and microstrip fed line used as additional resonators producing multi-resonant frequencies for covering the wireless communication operations are developed. The results show good multiband operation with -10 dB impedance bandwidths of 22.22%, 17.22% and 9.58% at the frequency range of 0.87 - 0.96 GHz, 1.710 - 1.88 GHz, and 2.4 - 2.485 GHz, respectively. Finally, the presented antenna can operate and cover the applications of GSM, DCS, and Wireless Local Area Network WLAN IEEE802.11 b/g. Moreover, the antenna gains at operating frequencies of 0.9 GHz, 1.8 GHz, and 2.4 GHz are 2.84, 2.14, and 1.37 dBi, respectively. Especially, the antenna radiation patterns are almost the bi-directional at all of operating frequencies.
{"title":"A multiband wide slotted antenna with Hilbert fractal slot on rectangular patch","authors":"Chamaiporn Ratnaratorn, Norakamon Wongsin, C. Mahatthanajatuphat, P. Akkaraekthalin","doi":"10.1109/ECTICON.2013.6559660","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559660","url":null,"abstract":"A multiband wide slotted antenna with Hilbert fractal slot on rectangular patch is presented. By using a wide slotted structure, a Hilbert fractal slot with 1st iterations in rectangular patch and microstrip fed line used as additional resonators producing multi-resonant frequencies for covering the wireless communication operations are developed. The results show good multiband operation with -10 dB impedance bandwidths of 22.22%, 17.22% and 9.58% at the frequency range of 0.87 - 0.96 GHz, 1.710 - 1.88 GHz, and 2.4 - 2.485 GHz, respectively. Finally, the presented antenna can operate and cover the applications of GSM, DCS, and Wireless Local Area Network WLAN IEEE802.11 b/g. Moreover, the antenna gains at operating frequencies of 0.9 GHz, 1.8 GHz, and 2.4 GHz are 2.84, 2.14, and 1.37 dBi, respectively. Especially, the antenna radiation patterns are almost the bi-directional at all of operating frequencies.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114553914","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559514
H. Alias, Mohd Ali, S. Ramli, M. M. Sulaiman, S. Kayat
This paper presents a novel design of aperture coupled microstrip antenna with back lobe reduction. The proposed design was based on the structure of a 2 by 2 planar array antenna with separated feeding technique, aperture coupler. The antenna is designed on Rogers Duroid substrate having dielectric, ε, of 2.2. Four dumbbell shaped DGS were etched on the ground plane for back radiation reduction. An antenna without DGS is first designed acting as reference. Both of the designs were simulated in CST Microwave Studio 2011 software based on operating frequency of 5.8GHz. A parametric study was done to investigate the effect of DGS dimensions. The results show that, by incorporating DGS onto the antenna, back radiation is reduced. The back lobe level is reduced from 4.6dB to 0.4887dB. Return loss were also improved from -26.089dB to -41.28dB. This design concept can be useful in reducing the back radiation of aperture coupled microstrip antenna.
提出了一种新型的后瓣减小孔径耦合微带天线设计。提出了一种基于分离馈电技术、孔径耦合器的2 × 2平面阵列天线结构设计方案。该天线设计在介电ε为2.2的Rogers Duroid衬底上。在地平面上蚀刻4个哑铃形的DGS以减少背辐射。首先设计了不带DGS的天线作为参考。两种设计都在CST Microwave Studio 2011软件中进行了仿真，工作频率为5.8GHz。通过参数研究探讨了DGS维度的影响。结果表明，通过在天线上加入DGS，可以减少天线的背辐射。后瓣电平从4.6dB降低到0.4887dB。回波损耗也从-26.089dB改善到-41.28dB。该设计思想可用于减小孔径耦合微带天线的背辐射。
{"title":"A back lobe reduction of aperture coupled microstrip antenna using DGS","authors":"H. Alias, Mohd Ali, S. Ramli, M. M. Sulaiman, S. Kayat","doi":"10.1109/ECTICON.2013.6559514","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559514","url":null,"abstract":"This paper presents a novel design of aperture coupled microstrip antenna with back lobe reduction. The proposed design was based on the structure of a 2 by 2 planar array antenna with separated feeding technique, aperture coupler. The antenna is designed on Rogers Duroid substrate having dielectric, ε, of 2.2. Four dumbbell shaped DGS were etched on the ground plane for back radiation reduction. An antenna without DGS is first designed acting as reference. Both of the designs were simulated in CST Microwave Studio 2011 software based on operating frequency of 5.8GHz. A parametric study was done to investigate the effect of DGS dimensions. The results show that, by incorporating DGS onto the antenna, back radiation is reduced. The back lobe level is reduced from 4.6dB to 0.4887dB. Return loss were also improved from -26.089dB to -41.28dB. This design concept can be useful in reducing the back radiation of aperture coupled microstrip antenna.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123639491","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 : 2013-05-15DOI: 10.1109/ECTICON.2013.6559567
Panus Sinsoontornpong, I. Roopkom, A. Worapishet
An improved distributed amplifier configuration based on a cascade of high-gain distributed amplifiers is introduced and investigated in this paper. The cascaded high-gain amplifier offers a multiplicative gain characteristic against the number of stages N and thus gain-bandwidth enhancement. The cascade connection also enables the use of the tapered drain line technique with no idle termination for further gain improvement. Verification is provided through simulation using a 0.18 μm RF CMOS process.
{"title":"Cascaded high-gain distributed amplifier configuration for enhanced gain-bandwidth product","authors":"Panus Sinsoontornpong, I. Roopkom, A. Worapishet","doi":"10.1109/ECTICON.2013.6559567","DOIUrl":"https://doi.org/10.1109/ECTICON.2013.6559567","url":null,"abstract":"An improved distributed amplifier configuration based on a cascade of high-gain distributed amplifiers is introduced and investigated in this paper. The cascaded high-gain amplifier offers a multiplicative gain characteristic against the number of stages N and thus gain-bandwidth enhancement. The cascade connection also enables the use of the tapered drain line technique with no idle termination for further gain improvement. Verification is provided through simulation using a 0.18 μm RF CMOS process.","PeriodicalId":273802,"journal":{"name":"2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125986136","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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