Pub Date : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756203
Mei Li, S. Xiao, Bing-Zhong Wang
A compact, low-profile pattern-reconfigurable antenna working at 2.4GHz is presented in this paper. The antenna exhibits two symmetrical switchable tilted beams with the maximum radiations at around ±60° off the z-axis in elevation plane. In contrast to omnidirectional antennas, directional antennas that can change their beam direction according to the location of sensors are beneficial in terms of energy consumption, signal sensitivity and long communication range. The proposed antenna can be used for on-body communication in some cases beam tilts are desired, for example the paths in the belt-to-wrist. The characteristics of antenna in free space and placed above a simplified human tissue are analyzed.
{"title":"Pattern-reconfigurable antenna for on-body communication","authors":"Mei Li, S. Xiao, Bing-Zhong Wang","doi":"10.1109/IMWS-BIO.2013.6756203","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756203","url":null,"abstract":"A compact, low-profile pattern-reconfigurable antenna working at 2.4GHz is presented in this paper. The antenna exhibits two symmetrical switchable tilted beams with the maximum radiations at around ±60° off the z-axis in elevation plane. In contrast to omnidirectional antennas, directional antennas that can change their beam direction according to the location of sensors are beneficial in terms of energy consumption, signal sensitivity and long communication range. The proposed antenna can be used for on-body communication in some cases beam tilts are desired, for example the paths in the belt-to-wrist. The characteristics of antenna in free space and placed above a simplified human tissue are analyzed.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90235632","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756156
Yongkui Yang, Xin Liu, Jun Zhou, J. Cheong, M. Je, W. Goh
This paper presents an ASIC design of ultra-low power SAR ADC. To achieve ultra-low power, the proposed ADC operates at ultra-low voltage, deploying a single-ended structure and top plate sampling technique. In order to improve sampling circuit linearity at ultra-low supply voltage, a bootstrapped switch is developed. A non-binary redundant algorithm is applied to correct the inevitable decision errors in the first few conversion steps. The proposed ADC is fabricated in a 0.18μm CMOS process. From the measurement results, it consumes only 16nW and achieves SNDR of 50.4dB, which is equivalent to an 8.08 ENOB, with 1kS/s sampling rate at 0.5V supply voltage.
{"title":"A 0.5V 16nW 8.08-ENOB SAR ADC for ultra-low power sensor applications","authors":"Yongkui Yang, Xin Liu, Jun Zhou, J. Cheong, M. Je, W. Goh","doi":"10.1109/IMWS-BIO.2013.6756156","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756156","url":null,"abstract":"This paper presents an ASIC design of ultra-low power SAR ADC. To achieve ultra-low power, the proposed ADC operates at ultra-low voltage, deploying a single-ended structure and top plate sampling technique. In order to improve sampling circuit linearity at ultra-low supply voltage, a bootstrapped switch is developed. A non-binary redundant algorithm is applied to correct the inevitable decision errors in the first few conversion steps. The proposed ADC is fabricated in a 0.18μm CMOS process. From the measurement results, it consumes only 16nW and achieves SNDR of 50.4dB, which is equivalent to an 8.08 ENOB, with 1kS/s sampling rate at 0.5V supply voltage.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79640563","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756140
R. Jegadeesan, Yong-xin Guo, M. Je
Wireless power transfer for biomedical implants using capacitive coupling (electric near field coupling) has been presented in this work as an attractive alternative to the traditional inductive coupling method with the benefits of simple topology, fewer components on the implant side, better EMI performance and robustness to surrounding metallic elements. The analysis and design of capacitive coupled power link for biomedical implants is presented with emphasis on modeling tissue losses. Design and evaluation of capacitive power link has been presented with experimental results that are verified using the theoretical model developed.
{"title":"Electric near-field coupling for wireless power transfer in biomedical applications","authors":"R. Jegadeesan, Yong-xin Guo, M. Je","doi":"10.1109/IMWS-BIO.2013.6756140","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756140","url":null,"abstract":"Wireless power transfer for biomedical implants using capacitive coupling (electric near field coupling) has been presented in this work as an attractive alternative to the traditional inductive coupling method with the benefits of simple topology, fewer components on the implant side, better EMI performance and robustness to surrounding metallic elements. The analysis and design of capacitive coupled power link for biomedical implants is presented with emphasis on modeling tissue losses. Design and evaluation of capacitive power link has been presented with experimental results that are verified using the theoretical model developed.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78487984","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756198
Wen-Juan Ye, Shanhong He, W. Che, Y. Juan
A new design of TEM wideband horn feed with four orthogonal ridges is presented, resulting in better VSWR and gain antenna for 6m-diameter reflector antenna. By tapering the ridges, it is possible to extend the operating frequency band while decreasing the size of feed. The proposed wideband feed with dual linearly polarization and compact size in a shared aperture takes the features of constant phase center, high efficiency etc. The feed is simulated with Ansoft HFSS. Design consideration, the simulated and measured VSWR of the constructed feed over the frequency band f0 ± Δf are presented and discussed which the Δf=0.34 f0.
{"title":"A compacted dual linearly polarization wideband feed for parabolic reflector antenna","authors":"Wen-Juan Ye, Shanhong He, W. Che, Y. Juan","doi":"10.1109/IMWS-BIO.2013.6756198","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756198","url":null,"abstract":"A new design of TEM wideband horn feed with four orthogonal ridges is presented, resulting in better VSWR and gain antenna for 6m-diameter reflector antenna. By tapering the ridges, it is possible to extend the operating frequency band while decreasing the size of feed. The proposed wideband feed with dual linearly polarization and compact size in a shared aperture takes the features of constant phase center, high efficiency etc. The feed is simulated with Ansoft HFSS. Design consideration, the simulated and measured VSWR of the constructed feed over the frequency band f0 ± Δf are presented and discussed which the Δf=0.34 f0.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81911526","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756174
Qinyi Lv, T. Hu, S. Qiao, Yongzhi Sun, J. Huangfu, L. Ran
In this paper, we present a Doppler radar sensor based approach capable of detecting both small- and large-scale biological motions. To fully recover the time domain motion information from backscattered microwave signals, the gradient descent and the extended DACM algorithms are utilized to solve the problems caused by DC offset and phase wrapping issues. Experimental results show that both Doppler bio-signals of the small-scale human cardiac motion and the large-scale human walk can be accurately detected. The proposed approach provides a generalized method for detecting different Doppler bio-signals in biomedical and healthcare applications.
{"title":"Non-contact detection of Doppler bio-signals based on gradient decent and extended DACM algorithms","authors":"Qinyi Lv, T. Hu, S. Qiao, Yongzhi Sun, J. Huangfu, L. Ran","doi":"10.1109/IMWS-BIO.2013.6756174","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756174","url":null,"abstract":"In this paper, we present a Doppler radar sensor based approach capable of detecting both small- and large-scale biological motions. To fully recover the time domain motion information from backscattered microwave signals, the gradient descent and the extended DACM algorithms are utilized to solve the problems caused by DC offset and phase wrapping issues. Experimental results show that both Doppler bio-signals of the small-scale human cardiac motion and the large-scale human walk can be accurately detected. The proposed approach provides a generalized method for detecting different Doppler bio-signals in biomedical and healthcare applications.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73654913","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756208
H. Lai, K. Mak, K. Luk
A new type of cross slot antenna with very low back radiation is proposed in this paper. The proposed antenna has a very low back radiation, which is below -27dB at its center frequency. The antenna is relatively small size, including very low profile and small projection area. Its structure is also very simple and it is very easy to design. The antenna is operated at 5.8GHz, which is the ISM band (5.725-5.875 GHz, which is around 2.6%). Its potential applications include 5.8 GHz Wi-Fi, On-body communication or medical applications.
{"title":"Cross slot antenna with very low back radiation for various wireless communications at 5.8GHz ISM band","authors":"H. Lai, K. Mak, K. Luk","doi":"10.1109/IMWS-BIO.2013.6756208","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756208","url":null,"abstract":"A new type of cross slot antenna with very low back radiation is proposed in this paper. The proposed antenna has a very low back radiation, which is below -27dB at its center frequency. The antenna is relatively small size, including very low profile and small projection area. Its structure is also very simple and it is very easy to design. The antenna is operated at 5.8GHz, which is the ISM band (5.725-5.875 GHz, which is around 2.6%). Its potential applications include 5.8 GHz Wi-Fi, On-body communication or medical applications.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73866873","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 : 2013-12-01DOI: 10.5573/IEEK.2013.50.12.056
Nam Hwi Jeong, Yoon Jae Bae, C. Cho
We present a rectifier for wireless power transmission using multiplier configuration in layout for MOSFETs which works at 13.56 MHz, designed to fit in CMOS process where conventionally used diodes are replaced with the cross-coupled MOSFETs. Full bridge rectifier structure without comparators is employed to reduce current consumption and to be working up to higher frequency. Multiplier configuration designed in layout reduces time delay originated from parasitic series resistance and shunt capacitance at each finger due to long connecting layout, leading to fast transition from on state to off state of cross-coupled circuit structure and vice versa. The power conversion efficiency is significantly increased due to this fast transition time. The rectifier is fabricated in 0.11μm CMOS process, RF to DC power conversion efficiency is measured as 86.4% at the peak, and this good efficiency is maintained up to 600 MHz, which is, to our best knowledge, the highest frequency based on cross-coupled configuration.
{"title":"CMOS rectifier for wireless power transmission using multiplier configuration","authors":"Nam Hwi Jeong, Yoon Jae Bae, C. Cho","doi":"10.5573/IEEK.2013.50.12.056","DOIUrl":"https://doi.org/10.5573/IEEK.2013.50.12.056","url":null,"abstract":"We present a rectifier for wireless power transmission using multiplier configuration in layout for MOSFETs which works at 13.56 MHz, designed to fit in CMOS process where conventionally used diodes are replaced with the cross-coupled MOSFETs. Full bridge rectifier structure without comparators is employed to reduce current consumption and to be working up to higher frequency. Multiplier configuration designed in layout reduces time delay originated from parasitic series resistance and shunt capacitance at each finger due to long connecting layout, leading to fast transition from on state to off state of cross-coupled circuit structure and vice versa. The power conversion efficiency is significantly increased due to this fast transition time. The rectifier is fabricated in 0.11μm CMOS process, RF to DC power conversion efficiency is measured as 86.4% at the peak, and this good efficiency is maintained up to 600 MHz, which is, to our best knowledge, the highest frequency based on cross-coupled configuration.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80752085","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756189
D. Schreurs, M. Mercuri, P. Soh, G. Vandenbosch
Radar techniques aiming at health monitoring have been investigated in recent years. The possibility of contactless monitoring human individuals has aroused interest in many applications especially where the use of wearable sensors generates discomfort which not only may affect the results but also imposes a risk factor. Radar technologies represent therefore the new emerging solution to promote the well-being of elderly people both in home and clinical environments. This paper provides an overview on recent advances in health monitoring using radar techniques. Moreover, an example of a concrete health monitoring system is also reported.
{"title":"Radar-Based Health Monitoring","authors":"D. Schreurs, M. Mercuri, P. Soh, G. Vandenbosch","doi":"10.1109/IMWS-BIO.2013.6756189","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756189","url":null,"abstract":"Radar techniques aiming at health monitoring have been investigated in recent years. The possibility of contactless monitoring human individuals has aroused interest in many applications especially where the use of wearable sensors generates discomfort which not only may affect the results but also imposes a risk factor. Radar technologies represent therefore the new emerging solution to promote the well-being of elderly people both in home and clinical environments. This paper provides an overview on recent advances in health monitoring using radar techniques. Moreover, an example of a concrete health monitoring system is also reported.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80753681","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756151
N. Shimomura, R. Nakamura, I. Matsunami, A. Kajiwara
Health-care support at home and care facilities is a very important issue in many developed countries because of the arrival of increasingly aging society. The increase in accidents and sudden illness such as heart attach involving the elderly person is a matter of great concern and the requirement for monitoring their vital signs is especially increasing. In this work, we have developed a stepped-FM UWB sensor system which can detect the breathing rate as well as movement of multiple persons in a room. It estimates some trajectories of moving persons within a room, then localizes and monitors multiple persons. While sleeping, therefore, it can also detect the breathing rate from very tiny motions. Measurements were conducted for two scenarios with multiple subjects. The results show that the sensor system offers the breath monitoring and movement of multiple persons.
{"title":"Stepped-FM UWB sensor system for health-care support","authors":"N. Shimomura, R. Nakamura, I. Matsunami, A. Kajiwara","doi":"10.1109/IMWS-BIO.2013.6756151","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756151","url":null,"abstract":"Health-care support at home and care facilities is a very important issue in many developed countries because of the arrival of increasingly aging society. The increase in accidents and sudden illness such as heart attach involving the elderly person is a matter of great concern and the requirement for monitoring their vital signs is especially increasing. In this work, we have developed a stepped-FM UWB sensor system which can detect the breathing rate as well as movement of multiple persons in a room. It estimates some trajectories of moving persons within a room, then localizes and monitors multiple persons. While sleeping, therefore, it can also detect the breathing rate from very tiny motions. Measurements were conducted for two scenarios with multiple subjects. The results show that the sensor system offers the breath monitoring and movement of multiple persons.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75171634","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 : 2013-12-01DOI: 10.1109/IMWS-BIO.2013.6756232
H. Hu, M. Karim, L. Ong, A. R. Leyman, B. Luo, T. M. Chiam, Y. X. Guo, X. Zhu
This paper presents an efficient method of millimeter wave (MMW) image formation using synthetic aperture radar (SAR) modeling. A commercial vector network analyser (VNA) transmits and receives the signal centered at 35GHz. The MMW signal illuminates and reflects off the surface of the target. The collected signals from VNA are processed under the MATLAB environment. Experiment results show that MMW imaging using SAR modeling not only improves the angular resolution but also provide better reconstruction result.
{"title":"Millimeter wave imaging using SAR modeling","authors":"H. Hu, M. Karim, L. Ong, A. R. Leyman, B. Luo, T. M. Chiam, Y. X. Guo, X. Zhu","doi":"10.1109/IMWS-BIO.2013.6756232","DOIUrl":"https://doi.org/10.1109/IMWS-BIO.2013.6756232","url":null,"abstract":"This paper presents an efficient method of millimeter wave (MMW) image formation using synthetic aperture radar (SAR) modeling. A commercial vector network analyser (VNA) transmits and receives the signal centered at 35GHz. The MMW signal illuminates and reflects off the surface of the target. The collected signals from VNA are processed under the MATLAB environment. Experiment results show that MMW imaging using SAR modeling not only improves the angular resolution but also provide better reconstruction result.","PeriodicalId":6321,"journal":{"name":"2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74647522","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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