Pub Date : 2011-07-03DOI: 10.1109/APS.2011.5996833
D. Arumugam, J. Griffin, D. Stancil, D. Ricketts
Magnetoquasistatic position tracking has been shown to be an excellent technique to measure distances between an emitting and receiving loop for distances up to 50 m along a direction perpendicular to the surface normal of the loops [1]. For short distances from the emitting loop (i.e., less than about ten loop radii) there is an error in the estimated distance. In this paper, we examine the cause of this error and show that a significant portion is due to the simplification of the emitting loop as a simple magnetic dipole. By including a more accurate expression of the source field, errors can be significantly reduced. We show that the first correction term results in a reduction in rms and peak distance estimation error of 12.51 cm (54.44 %) and 11.27 cm (44.72 %), respectively, for distances less than 1.5δ, where δ is the skin depth.
{"title":"Higher order loop corrections for short range magnetoquasistatic position tracking","authors":"D. Arumugam, J. Griffin, D. Stancil, D. Ricketts","doi":"10.1109/APS.2011.5996833","DOIUrl":"https://doi.org/10.1109/APS.2011.5996833","url":null,"abstract":"Magnetoquasistatic position tracking has been shown to be an excellent technique to measure distances between an emitting and receiving loop for distances up to 50 m along a direction perpendicular to the surface normal of the loops [1]. For short distances from the emitting loop (i.e., less than about ten loop radii) there is an error in the estimated distance. In this paper, we examine the cause of this error and show that a significant portion is due to the simplification of the emitting loop as a simple magnetic dipole. By including a more accurate expression of the source field, errors can be significantly reduced. We show that the first correction term results in a reduction in rms and peak distance estimation error of 12.51 cm (54.44 %) and 11.27 cm (44.72 %), respectively, for distances less than 1.5δ, where δ is the skin depth.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"52 1","pages":"1755-1757"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87552037","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 : 2011-07-03DOI: 10.1109/APS.2011.5997116
G. Oliveri
This paper deals with synthesis of time-modulated linear arrays for adaptive nulling and beamforming where the intrinsic characteristics of this type of antenna arrays can be fully exploited, thanks to the capability of fast reconfiguration of its radiation pattern through the modification of the digital on-off signals controlling the element excitations. A strategy based on the particle swarm optimization is adopted to determine the optimal pulse sequences. A set of simulation experiments is finally proposed as a numerical validation.
{"title":"Smart antennas design exploiting time-modulation","authors":"G. Oliveri","doi":"10.1109/APS.2011.5997116","DOIUrl":"https://doi.org/10.1109/APS.2011.5997116","url":null,"abstract":"This paper deals with synthesis of time-modulated linear arrays for adaptive nulling and beamforming where the intrinsic characteristics of this type of antenna arrays can be fully exploited, thanks to the capability of fast reconfiguration of its radiation pattern through the modification of the digital on-off signals controlling the element excitations. A strategy based on the particle swarm optimization is adopted to determine the optimal pulse sequences. A set of simulation experiments is finally proposed as a numerical validation.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"2 1","pages":"2833-2836"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86249626","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 : 2011-07-03DOI: 10.1109/APS.2011.5997237
Y. Yang, K. Y. Chan, R. Ramer
This paper presents for the first time a study on a 3-bit coplanar waveguide (CPW) NEMS phase shifter simulated and optimized at 600 GHz. Simulation results based on the Ansoft High Frequency Structure Simulator (HFSS) predict a return loss better than 19.5 dB for all bit combinations in the frequency band of 550 GHz to 650 GHz. A maximum phase error less of than 3.91 % is simulated. The dimension of the device is 59.3 µm × 37.8 µm. This is the first smallest 600 GHz RF NEMS phase shifter design up-to-date.
{"title":"Design of 600 GHz 3-bit delay-line phase shifter using RF NEMS series switches","authors":"Y. Yang, K. Y. Chan, R. Ramer","doi":"10.1109/APS.2011.5997237","DOIUrl":"https://doi.org/10.1109/APS.2011.5997237","url":null,"abstract":"This paper presents for the first time a study on a 3-bit coplanar waveguide (CPW) NEMS phase shifter simulated and optimized at 600 GHz. Simulation results based on the Ansoft High Frequency Structure Simulator (HFSS) predict a return loss better than 19.5 dB for all bit combinations in the frequency band of 550 GHz to 650 GHz. A maximum phase error less of than 3.91 % is simulated. The dimension of the device is 59.3 µm × 37.8 µm. This is the first smallest 600 GHz RF NEMS phase shifter design up-to-date.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"1 1","pages":"3287-3290"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86199190","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 : 2011-07-03DOI: 10.1109/APS.2011.5996771
K. Ho, Donghyup Shin, Gabriel M. Rebeiz
We present the development of an 8-channel X-band microstrip phased array receiver with beam-scan capability of +/−45 degrees in the azimuth plane. Two 0.13 µm CMOS RFIC chips are integrated directly on the laminates for the array feed network, with each chip comprising of a 4-way power combiner network and 4 channels of RF front-end. Each RF-front-end consists of an LNA, a VGA and a phase shifter, and the total chip size is 2.9 by 2.5 mm2. The design center frequency and bandwidth is 9.2 GHz and 75 MHz, respectively. An aperture coupled microstrip antenna is used for the basic radiating element, and measured response for the microstrip element deviates from the simulated response by 1.2 %.
{"title":"X-band phased array development on teflon laminates with CMOS RFIC receivers","authors":"K. Ho, Donghyup Shin, Gabriel M. Rebeiz","doi":"10.1109/APS.2011.5996771","DOIUrl":"https://doi.org/10.1109/APS.2011.5996771","url":null,"abstract":"We present the development of an 8-channel X-band microstrip phased array receiver with beam-scan capability of +/−45 degrees in the azimuth plane. Two 0.13 µm CMOS RFIC chips are integrated directly on the laminates for the array feed network, with each chip comprising of a 4-way power combiner network and 4 channels of RF front-end. Each RF-front-end consists of an LNA, a VGA and a phase shifter, and the total chip size is 2.9 by 2.5 mm2. The design center frequency and bandwidth is 9.2 GHz and 75 MHz, respectively. An aperture coupled microstrip antenna is used for the basic radiating element, and measured response for the microstrip element deviates from the simulated response by 1.2 %.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"2000 1","pages":"565-568"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86231818","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 : 2011-07-03DOI: 10.1109/APS.2011.5996450
P. Nikitin, K. Rao
This paper presents a method for contactless gain measurements of 50 Ohm antennas. The method is based on connecting a special passive RFID chip assembly, matched to 50 Ohm in the wide band, to the antenna and measuring the read sensitivity of the resulting tag in the tag characterization system. The gain of the antenna is then calculated from previous calibrated measurement done with reference antenna of known gain, such as dipole. We illustrate the method with experimental measurements on several antennas. The main advantage of this method is that it does not require any external cables and can be used for characterization of small antennas inside modern mobile wireless devices.
{"title":"Gain measurement of antennas using RFID","authors":"P. Nikitin, K. Rao","doi":"10.1109/APS.2011.5996450","DOIUrl":"https://doi.org/10.1109/APS.2011.5996450","url":null,"abstract":"This paper presents a method for contactless gain measurements of 50 Ohm antennas. The method is based on connecting a special passive RFID chip assembly, matched to 50 Ohm in the wide band, to the antenna and measuring the read sensitivity of the resulting tag in the tag characterization system. The gain of the antenna is then calculated from previous calibrated measurement done with reference antenna of known gain, such as dipole. We illustrate the method with experimental measurements on several antennas. The main advantage of this method is that it does not require any external cables and can be used for characterization of small antennas inside modern mobile wireless devices.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"45 1","pages":"1012-1015"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86304789","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 : 2011-07-03DOI: 10.1109/APS.2011.5996627
Joshua M. Patin, S. Sharma
This paper presents a novel single feed Dielectric Resonator Antenna (DRA) exhibiting dual band operation in the Ku-band. The dual band operation is characterized by one circular polarized band centered at 13 GHz with 17.24% 3 dB axial ratio bandwidth and one band at 10.55 GHz with 5.58% 20 dB axial ratio bandwidth, which is basically approximating linear polarization. In both bands, the Dielectric Resonator is excited in its HEM11δ resonant mode. The design features a single feed design utilizing back-side microstrip excitation through novel bowtie cross slots.
{"title":"Dual band single feed dielectric resonator antenna with linear and circular polariziations for ku-band","authors":"Joshua M. Patin, S. Sharma","doi":"10.1109/APS.2011.5996627","DOIUrl":"https://doi.org/10.1109/APS.2011.5996627","url":null,"abstract":"This paper presents a novel single feed Dielectric Resonator Antenna (DRA) exhibiting dual band operation in the Ku-band. The dual band operation is characterized by one circular polarized band centered at 13 GHz with 17.24% 3 dB axial ratio bandwidth and one band at 10.55 GHz with 5.58% 20 dB axial ratio bandwidth, which is basically approximating linear polarization. In both bands, the Dielectric Resonator is excited in its HEM11δ resonant mode. The design features a single feed design utilizing back-side microstrip excitation through novel bowtie cross slots.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"41 1","pages":"1678-1681"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86542960","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 : 2011-07-03DOI: 10.1109/APS.2011.5996496
H. Youn, N. Celik, M. Iskander, James M. Baker, James Graham, S. Murphy
In this paper, we proposed a new broadband conical spiral antenna. This antenna adopted corrugated arms in the outer turns to improve low frequency operation. Tapered resistive loading along an exponential profile was also applied to suppress the reflected backward traveling wave which causes undesirable radiation characteristics in low frequency band. Characteristics of antenna components and parameters are provided along with guidelines and recommendations for miniaturization. The proposed antenna aimed to operate from 300 MHz to 1.2 GHz using 7 inch aperture and 6 inch height. Antenna characteristics were analyzed by FEKO simulations and simulation results will be presented.
{"title":"Miniaturized conical spiral antenna with tapered resistive roading and corrugated arms","authors":"H. Youn, N. Celik, M. Iskander, James M. Baker, James Graham, S. Murphy","doi":"10.1109/APS.2011.5996496","DOIUrl":"https://doi.org/10.1109/APS.2011.5996496","url":null,"abstract":"In this paper, we proposed a new broadband conical spiral antenna. This antenna adopted corrugated arms in the outer turns to improve low frequency operation. Tapered resistive loading along an exponential profile was also applied to suppress the reflected backward traveling wave which causes undesirable radiation characteristics in low frequency band. Characteristics of antenna components and parameters are provided along with guidelines and recommendations for miniaturization. The proposed antenna aimed to operate from 300 MHz to 1.2 GHz using 7 inch aperture and 6 inch height. Antenna characteristics were analyzed by FEKO simulations and simulation results will be presented.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"86 9 1","pages":"1185-1188"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84001728","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 : 2011-07-03DOI: 10.1109/APS.2011.5996686
J. Q. Bagley, L. Tsang
We investigate image enhancement of transmitted optical fields though plasmon film lenses with smooth surfaces, random rough surfaces, and sinusoidal rough surfaces. We show that the silver film lens with small periodic roughness can provide image enhancement. Image enhancement is defined by the spatial width of the image in the image plane. It is shown that the spatial width can be significantly less than a wavelength. It is also shown that the image integrity is preserved. On the other hand, random roughness does not preserve image integrity. In the formulation we consider a line source placed above the plasmon film lens with roughness. Two numerical methods, viz., method of moments and T-matrix method, are used to calculate the results.
{"title":"Image enhancement using rough surface effects in plasmon materials","authors":"J. Q. Bagley, L. Tsang","doi":"10.1109/APS.2011.5996686","DOIUrl":"https://doi.org/10.1109/APS.2011.5996686","url":null,"abstract":"We investigate image enhancement of transmitted optical fields though plasmon film lenses with smooth surfaces, random rough surfaces, and sinusoidal rough surfaces. We show that the silver film lens with small periodic roughness can provide image enhancement. Image enhancement is defined by the spatial width of the image in the image plane. It is shown that the spatial width can be significantly less than a wavelength. It is also shown that the image integrity is preserved. On the other hand, random roughness does not preserve image integrity. In the formulation we consider a line source placed above the plasmon film lens with roughness. Two numerical methods, viz., method of moments and T-matrix method, are used to calculate the results.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"19 1","pages":"239-242"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82854433","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 : 2011-07-03DOI: 10.1109/APS.2011.5997096
M. R. Islam, Mohammod Ali
A three-element wearable antenna array is introduced for operation at 2.45 GHz. Using varactor controlled parasitic elements near a driven folded dipole a scanning angular range of 95° can be achieved in the azimuth plane. Simulation results confirm that the peak gain of the array is 6.9 dBi when it is placed at 20 mm above the chest of a heterogeneous anatomical human body model. Almost 30% improvement in radiation efficiency is obtained with the parasitic array compared to a single resonant antenna. Also the new antenna array results in much lower specific absorption rate (SAR) compared to a conventional resonant λ/2 dipole antenna.
{"title":"A novel wearable antenna array for 2.45 GHz WLAN application","authors":"M. R. Islam, Mohammod Ali","doi":"10.1109/APS.2011.5997096","DOIUrl":"https://doi.org/10.1109/APS.2011.5997096","url":null,"abstract":"A three-element wearable antenna array is introduced for operation at 2.45 GHz. Using varactor controlled parasitic elements near a driven folded dipole a scanning angular range of 95° can be achieved in the azimuth plane. Simulation results confirm that the peak gain of the array is 6.9 dBi when it is placed at 20 mm above the chest of a heterogeneous anatomical human body model. Almost 30% improvement in radiation efficiency is obtained with the parasitic array compared to a single resonant antenna. Also the new antenna array results in much lower specific absorption rate (SAR) compared to a conventional resonant λ/2 dipole antenna.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"298 1","pages":"2754-2757"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86760552","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 : 2011-07-03DOI: 10.1109/APS.2011.5996512
A. Matsui, Takashi Kaneko
This paper has discussed matching and radiation characteristics of tapered slot antenna with conductor roof. The physical form has resembled to double ridged horn antenna but the radiation characteristic has been close to conventional TSA. The effect of the roof has come in the radiation pattern modification and increasing the gain as results. It has been remained to study design method of the roof to realize radiation pattern interested and to investigate mutual coupling.
{"title":"Tapered slot antenna with conductor roof","authors":"A. Matsui, Takashi Kaneko","doi":"10.1109/APS.2011.5996512","DOIUrl":"https://doi.org/10.1109/APS.2011.5996512","url":null,"abstract":"This paper has discussed matching and radiation characteristics of tapered slot antenna with conductor roof. The physical form has resembled to double ridged horn antenna but the radiation characteristic has been close to conventional TSA. The effect of the roof has come in the radiation pattern modification and increasing the gain as results. It has been remained to study design method of the roof to realize radiation pattern interested and to investigate mutual coupling.","PeriodicalId":6449,"journal":{"name":"2011 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"31 1","pages":"1243-1246"},"PeriodicalIF":0.0,"publicationDate":"2011-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86768862","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：