Pub Date : 2012-03-05DOI: 10.1109/IWAT.2012.6178684
K. Ng, H. Wong, C. Chan, K. Luk
A novel waveguide fed array antenna with shorted microstrip patch elements is proposed in this paper. The proposed antenna is different from conventional slotted waveguide antennas and other waveguide fed antennas in two folds. Firstly, slots, each loaded with a shorted microstrip patch element and a shorted parasitic element, are placed along the center axis of the waveguide. Secondly, the antenna elements are directly fed by the waveguide, not through aperture coupling. The waveguide is easily realized using substrate integrated waveguide (SIW) technology. The proposed antenna, operating at 35 GHz, has a wide impedance bandwidth of 10.2% (VSWR <; 2), a maximum gain of around 12 dBi and directional symmetric radiation pattern.
{"title":"A novel waveguide fed array antenna with shorted microstrip patch elements","authors":"K. Ng, H. Wong, C. Chan, K. Luk","doi":"10.1109/IWAT.2012.6178684","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178684","url":null,"abstract":"A novel waveguide fed array antenna with shorted microstrip patch elements is proposed in this paper. The proposed antenna is different from conventional slotted waveguide antennas and other waveguide fed antennas in two folds. Firstly, slots, each loaded with a shorted microstrip patch element and a shorted parasitic element, are placed along the center axis of the waveguide. Secondly, the antenna elements are directly fed by the waveguide, not through aperture coupling. The waveguide is easily realized using substrate integrated waveguide (SIW) technology. The proposed antenna, operating at 35 GHz, has a wide impedance bandwidth of 10.2% (VSWR <; 2), a maximum gain of around 12 dBi and directional symmetric radiation pattern.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"3 1","pages":"351-354"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87281934","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178686
Ki Joon Kim, W. Choi, Y. Yoon
An array structure with uniform heat distribution for the applicator in regional hyperthermia treatment is proposed. The array structure is composed with modified dipole elements which are operated at 433 MHz. A dipole element includes branched radiation strip and matching network. The simulation is performed with simplified human body, bolus, and the applicator on FR-4 substrate. The 2×2 array with circularly rotated feeding which rotates the elements clockwise with own direction has uniformly distributed heat pattern than normal array. The heat distribution is observed which is obtained from specific absorption rate (SAR) and bio-heat equation and shows the adequate of the proposed applicator for regional hyperthermia treatment.
{"title":"Array structure for uniform heat distribution with modified dipole elements","authors":"Ki Joon Kim, W. Choi, Y. Yoon","doi":"10.1109/IWAT.2012.6178686","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178686","url":null,"abstract":"An array structure with uniform heat distribution for the applicator in regional hyperthermia treatment is proposed. The array structure is composed with modified dipole elements which are operated at 433 MHz. A dipole element includes branched radiation strip and matching network. The simulation is performed with simplified human body, bolus, and the applicator on FR-4 substrate. The 2×2 array with circularly rotated feeding which rotates the elements clockwise with own direction has uniformly distributed heat pattern than normal array. The heat distribution is observed which is obtained from specific absorption rate (SAR) and bio-heat equation and shows the adequate of the proposed applicator for regional hyperthermia treatment.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"94 1","pages":"358-361"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85216165","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178644
Ning Zhu, R. Ziolkowski
Several GPS L1 (1.5754 GHz) rectennas have been developed for low input power applications. These rectennas incorporate high efficiency, electrically small, metamaterial-inspired near field resonant parasitic antennas, and a Schottky diode that has a low built-in voltage, and a resistor as the load. For the low, 0.0 dBm (1.0 mW), input power level to the protractor-based rectennas, the measured rectifying efficiencies of the larger (ka = 0.808) and 25% smaller (ka = 0.604) protractor versions are, respectively, 78.0% at 1.5754 GHz and 67.9% at 1.55 GHz. Similarly, for the 0dBm input power to an S-inclusion-based rectenna (ka~0.611) that again is matched directly to the input impedance of the rectifying circuit, the simulated and measured rectifying efficiencies were, respectively, 75.7% and 79.6%. It will be demonstrated that the simulated and measured results are in good agreement in all cases.
{"title":"Metamaterial-inspired GPS L1 rectennas","authors":"Ning Zhu, R. Ziolkowski","doi":"10.1109/IWAT.2012.6178644","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178644","url":null,"abstract":"Several GPS L1 (1.5754 GHz) rectennas have been developed for low input power applications. These rectennas incorporate high efficiency, electrically small, metamaterial-inspired near field resonant parasitic antennas, and a Schottky diode that has a low built-in voltage, and a resistor as the load. For the low, 0.0 dBm (1.0 mW), input power level to the protractor-based rectennas, the measured rectifying efficiencies of the larger (ka = 0.808) and 25% smaller (ka = 0.604) protractor versions are, respectively, 78.0% at 1.5754 GHz and 67.9% at 1.55 GHz. Similarly, for the 0dBm input power to an S-inclusion-based rectenna (ka~0.611) that again is matched directly to the input impedance of the rectifying circuit, the simulated and measured rectifying efficiencies were, respectively, 75.7% and 79.6%. It will be demonstrated that the simulated and measured results are in good agreement in all cases.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"14 1","pages":"193-196"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84369002","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178646
Xuyang Li, L. Zwirello, M. Jalilvand, T. Zwick
A planar UWB slot-antenna with a size of 35×35mm2 is proposed for stroke detection. The antenna is optimized for operation directly on human skin in the frequency range from 1 to 9 GHz. A sector-like slot is applied to the design to enhance the bandwidth regarding the current distribution. The near-field performance of the antenna is characterized and verified by the measurements. Benefiting from a symmetrical structure and differential feeding technique the antenna owns a very stable radiation behavior in the whole frequency range and a very high front-to-back ratio which would improve the stroke detection capability of the brain imaging system with robust performance.
{"title":"Design and near-field characterization of a planar on-body UWB slot-antenna for stroke detection","authors":"Xuyang Li, L. Zwirello, M. Jalilvand, T. Zwick","doi":"10.1109/IWAT.2012.6178646","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178646","url":null,"abstract":"A planar UWB slot-antenna with a size of 35×35mm2 is proposed for stroke detection. The antenna is optimized for operation directly on human skin in the frequency range from 1 to 9 GHz. A sector-like slot is applied to the design to enhance the bandwidth regarding the current distribution. The near-field performance of the antenna is characterized and verified by the measurements. Benefiting from a symmetrical structure and differential feeding technique the antenna owns a very stable radiation behavior in the whole frequency range and a very high front-to-back ratio which would improve the stroke detection capability of the brain imaging system with robust performance.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"201-204"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76955723","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178386
W. Palmer
Antennas are a critical component for most if not all Army electromagnetic (EM) communications and sensor systems. The number of EM systems per platform is large and growing, which places severe restrictions on system size, weight, and power. The ever-increasing demand for bandwidth and interoperability will only make these systems more complex, driving the need for innovative basic research on multifunctional systems and antennas. This paper will provide an overview of the structure and function of the U.S. Army science and technology enterprise, describe requirements and applications for Army antennas and the EM environment in which they operate, and suggest promising areas for future research.
{"title":"Antenna research for army electromagnetic systems","authors":"W. Palmer","doi":"10.1109/IWAT.2012.6178386","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178386","url":null,"abstract":"Antennas are a critical component for most if not all Army electromagnetic (EM) communications and sensor systems. The number of EM systems per platform is large and growing, which places severe restrictions on system size, weight, and power. The ever-increasing demand for bandwidth and interoperability will only make these systems more complex, driving the need for innovative basic research on multifunctional systems and antennas. This paper will provide an overview of the structure and function of the U.S. Army science and technology enterprise, describe requirements and applications for Army antennas and the EM environment in which they operate, and suggest promising areas for future research.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"35 1","pages":"12-15"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77099092","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178658
M. Niamien, A. Sharaiha, S. Collardey, K. Mahdjoubi
An electrically small frequency-reconfigurable antenna with a very wide tuning band is proposed. The antenna consists in a printed meandered monopole antenna loaded by varactor diodes. The radiating element has a size of 15*15*3 mm3 and is mounted on a 230*130mm2 ground plane. A thick block of a commercial magneto-dielectric material is inserted over the double-meandered antenna as a superstrate This antenna is able to maintain a return loss below -10 dB over 8 MHz bandwidth reconfigurable channel from 450 to 900 MHz without using any external matching circuit. The measured tuning range of the fabricated antenna reaches from 470-862MHz covering the whole frequency band specification of the DVB-H standard.
{"title":"An electrically small frequency reconfigurable antenna for DVB-H","authors":"M. Niamien, A. Sharaiha, S. Collardey, K. Mahdjoubi","doi":"10.1109/IWAT.2012.6178658","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178658","url":null,"abstract":"An electrically small frequency-reconfigurable antenna with a very wide tuning band is proposed. The antenna consists in a printed meandered monopole antenna loaded by varactor diodes. The radiating element has a size of 15*15*3 mm3 and is mounted on a 230*130mm2 ground plane. A thick block of a commercial magneto-dielectric material is inserted over the double-meandered antenna as a superstrate This antenna is able to maintain a return loss below -10 dB over 8 MHz bandwidth reconfigurable channel from 450 to 900 MHz without using any external matching circuit. The measured tuning range of the fabricated antenna reaches from 470-862MHz covering the whole frequency band specification of the DVB-H standard.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"6 1","pages":"245-248"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81777797","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178649
Q. Abbasi, A. Alomainy, Y. Hao
Diversity is powerful tool for combat fading. This paper presents experimental investigations and comparison of ultra wideband antenna diversity technique for on-body and off-body radio propagation channels. Diversity gain (DG) is calculated for five different channels namely: Access point (AP)/belt-to-head, AP/belt-to-chest, AP/belt-to-wrist, AP/belt-to-ankle and AP/belt-to-back with the subject performing realistic movements of different nature in an indoor environment. Results showed that almost 50% improvement in DG is obtained for off-body case as compared to on-body case, which shows the usefulness of UWB off-body diversity for body centric wireless communications.
{"title":"Ultra wideband antenna diversity techniques for on/off-body radio channel characterisation","authors":"Q. Abbasi, A. Alomainy, Y. Hao","doi":"10.1109/IWAT.2012.6178649","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178649","url":null,"abstract":"Diversity is powerful tool for combat fading. This paper presents experimental investigations and comparison of ultra wideband antenna diversity technique for on-body and off-body radio propagation channels. Diversity gain (DG) is calculated for five different channels namely: Access point (AP)/belt-to-head, AP/belt-to-chest, AP/belt-to-wrist, AP/belt-to-ankle and AP/belt-to-back with the subject performing realistic movements of different nature in an indoor environment. Results showed that almost 50% improvement in DG is obtained for off-body case as compared to on-body case, which shows the usefulness of UWB off-body diversity for body centric wireless communications.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"209-212"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90785025","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178392
Jin Shao, G. Manandhar, B. Arigong, Hualiang Zhang
We propose a dual-band RF device to detect the dielectric changes in polydimethylsiloxane (PDMS) microfluidic channel. Such a device, which consists of two dual-band Wilkinson power dividers (working at 2GHz and 5GHz) and two 90° dual-band microstrip lines (providing 180° phase difference at two working frequencies), is very sensitive for identifying dielectric material changes. Moreover, by operating at two frequencies simultaneously, it can improve the measurement stability/robustness. Compared with the recently reported RF microfluidic sensor [Yang et al, Lab Chip, 10, 553, (2010)], the proposed device features enhanced measurement stability with the same level of measurement sensitivity (-80dB cancellation level).
提出了一种用于检测聚二甲基硅氧烷(PDMS)微流控通道中介电变化的双频射频器件。该器件由两个双频威尔金森功率分配器(工作在2GHz和5GHz)和两个90°双频微带线(在两个工作频率下提供180°相位差)组成，对介电材料变化的识别非常敏感。此外，通过同时在两个频率下工作，可以提高测量的稳定性/鲁棒性。与最近报道的射频微流控传感器[Yang et al, Lab Chip, 10, 553，(2010)]相比，该装置在相同的测量灵敏度水平(-80dB抵消水平)下具有更高的测量稳定性。
{"title":"Dual-band radio-frequency device for sensing dielectric property changes in microfluidic channel","authors":"Jin Shao, G. Manandhar, B. Arigong, Hualiang Zhang","doi":"10.1109/IWAT.2012.6178392","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178392","url":null,"abstract":"We propose a dual-band RF device to detect the dielectric changes in polydimethylsiloxane (PDMS) microfluidic channel. Such a device, which consists of two dual-band Wilkinson power dividers (working at 2GHz and 5GHz) and two 90° dual-band microstrip lines (providing 180° phase difference at two working frequencies), is very sensitive for identifying dielectric material changes. Moreover, by operating at two frequencies simultaneously, it can improve the measurement stability/robustness. Compared with the recently reported RF microfluidic sensor [Yang et al, Lab Chip, 10, 553, (2010)], the proposed device features enhanced measurement stability with the same level of measurement sensitivity (-80dB cancellation level).","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"17 1","pages":"36-39"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90830162","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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