Pub Date : 2012-10-08DOI: 10.1109/APWC.2012.6324952
Hon San Ngan, X. Fang, K. Leung
A singly-fed dual-band circularly polarized dielectric resonator antenna (DRA) is investigated in this paper. It makes use of the fundamental TE111mode and higher-order TE113mode of a rectangular DRA for the dualband design. The DRA has a square cross section. It is excited by a single microstripline-fed rectangular slot fed. To generate circularly polarized (CP) fields, two corners of the DRA are truncated at 45°, exciting two sets of degenerate orthogonal modes, namely (TE111x, TE111y) and (TE113x, TE113y). Measured results show that the axial-ratio bandwidths of the lower and upper bands are 5.2% and 1.4%, respectively. The reflection coefficient, axial ratio, radiation pattern, and gain of the antenna are studied using ANSYS HFSS. Measurements were carried out to verify the simulations and reasonable agreement between the measured and simulated results is observed.
{"title":"Design of dual-band circularly polarized dielectric resonator antenna using a higher-order mode","authors":"Hon San Ngan, X. Fang, K. Leung","doi":"10.1109/APWC.2012.6324952","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324952","url":null,"abstract":"A singly-fed dual-band circularly polarized dielectric resonator antenna (DRA) is investigated in this paper. It makes use of the fundamental TE<sub>111</sub>mode and higher-order TE<sub>113</sub>mode of a rectangular DRA for the dualband design. The DRA has a square cross section. It is excited by a single microstripline-fed rectangular slot fed. To generate circularly polarized (CP) fields, two corners of the DRA are truncated at 45°, exciting two sets of degenerate orthogonal modes, namely (TE<sub>111</sub><sup>x</sup>, TE<sub>111</sub><sup>y</sup>) and (TE<sub>113</sub><sup>x</sup>, TE<sub>113</sub><sup>y</sup>). Measured results show that the axial-ratio bandwidths of the lower and upper bands are 5.2% and 1.4%, respectively. The reflection coefficient, axial ratio, radiation pattern, and gain of the antenna are studied using ANSYS HFSS. Measurements were carried out to verify the simulations and reasonable agreement between the measured and simulated results is observed.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73938334","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324935
G. Addamo, O. Peverini, G. Virone, R. Tascone, P. Cecchini, R. Ravanelli
This paper presents the research activity carried out jointly by the IEIIT -CNR and Thales Alenia Space Italy aimed at the development of multi-band systems. The paper focuses on a synthesis technique that is applied to the design of single- and multi-band feed horns.
{"title":"Design of multi-band feed horns for space applications","authors":"G. Addamo, O. Peverini, G. Virone, R. Tascone, P. Cecchini, R. Ravanelli","doi":"10.1109/APWC.2012.6324935","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324935","url":null,"abstract":"This paper presents the research activity carried out jointly by the IEIIT -CNR and Thales Alenia Space Italy aimed at the development of multi-band systems. The paper focuses on a synthesis technique that is applied to the design of single- and multi-band feed horns.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75066320","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324925
R. Gayen, S. Das
In this paper we have presented the detailed analysis of a dual band or nearly omnidirectional slot radiator using the shunt slot doublets. The design of the antenna assumes that the two slots, milled on the opposite broad walls of a rectangular waveguide, are of different slot length. The slots, being of different length, resonate at two different frequencies and thus form a dual band antenna. The analysis of the proposed antenna is based on Multiple Cavity Modeling Technique (MCMT). The analysis has been validated by the excellent agreement obtained between the MCMT data, Ansoft HFSS simulated data and experimental data.
{"title":"Design and analysis of waveguide slot doublets for dual band or nearly - omnidirectional radiation properties","authors":"R. Gayen, S. Das","doi":"10.1109/APWC.2012.6324925","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324925","url":null,"abstract":"In this paper we have presented the detailed analysis of a dual band or nearly omnidirectional slot radiator using the shunt slot doublets. The design of the antenna assumes that the two slots, milled on the opposite broad walls of a rectangular waveguide, are of different slot length. The slots, being of different length, resonate at two different frequencies and thus form a dual band antenna. The analysis of the proposed antenna is based on Multiple Cavity Modeling Technique (MCMT). The analysis has been validated by the excellent agreement obtained between the MCMT data, Ansoft HFSS simulated data and experimental data.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76286867","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324936
G. Lasser, L. Mayer, C. Mecklenbrauker
Advanced tyre monitoring systems are based on small sensor units directly embedded into the tyre rubber. In contrast to conventional tyre monitoring systems, more data like vibration information and slip angle are collected at this exposed position, so vehicular safety systems can be further improved. Powering of and communication with these sensor units, could be done with UHF radio frequency identification technology. In this contribution we propose a novel compact switched-beam antenna suitable for UHF frequencies. When mounted below the body floor pan of a vehicle, its directivity of 6 dB and the possibility to switch the main beam direction in 90? steps enables selection of a specific tyre for communication. Finally, we present measurements of the assembled antenna performed in an anechoic chamber.
{"title":"Compact low profile UHF switched-beam antenna for advanced tyre monitoring systems","authors":"G. Lasser, L. Mayer, C. Mecklenbrauker","doi":"10.1109/APWC.2012.6324936","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324936","url":null,"abstract":"Advanced tyre monitoring systems are based on small sensor units directly embedded into the tyre rubber. In contrast to conventional tyre monitoring systems, more data like vibration information and slip angle are collected at this exposed position, so vehicular safety systems can be further improved. Powering of and communication with these sensor units, could be done with UHF radio frequency identification technology. In this contribution we propose a novel compact switched-beam antenna suitable for UHF frequencies. When mounted below the body floor pan of a vehicle, its directivity of 6 dB and the possibility to switch the main beam direction in 90? steps enables selection of a specific tyre for communication. Finally, we present measurements of the assembled antenna performed in an anechoic chamber.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81637930","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324912
G. Vinci, F. Barbon, S. Lindner, R. Weigel, A. Koelpin
For several wireless data transmission systems the relevance of the information is dependent on the position of the information source. Therefore, Direction Of Arrival (DOA) detection of an incoming radio frequency signal is for several applications an important task. Typical applications for which DOA detection is relevant are for instance high-accuracy indoor navigation systems and dedicated high-speed wireless data links. For accurate DOA analysis a six-port receiver front-end is proposed. Benefits of the six-port architecture are high bandwidth and low circuit complexity. A solution for simultaneous data reception and DOA detection with the enhanced six-port receiver concept is also presented.
{"title":"Six-port based high-resolution smart antenna alignment sensor","authors":"G. Vinci, F. Barbon, S. Lindner, R. Weigel, A. Koelpin","doi":"10.1109/APWC.2012.6324912","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324912","url":null,"abstract":"For several wireless data transmission systems the relevance of the information is dependent on the position of the information source. Therefore, Direction Of Arrival (DOA) detection of an incoming radio frequency signal is for several applications an important task. Typical applications for which DOA detection is relevant are for instance high-accuracy indoor navigation systems and dedicated high-speed wireless data links. For accurate DOA analysis a six-port receiver front-end is proposed. Benefits of the six-port architecture are high bandwidth and low circuit complexity. A solution for simultaneous data reception and DOA detection with the enhanced six-port receiver concept is also presented.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90521576","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324914
S. Koziel, S. Ogurtsov
Design closure aided by electromagnetic (EM) simulations is often a necessary step in the antenna design process. It is also challenging because of the fact that accurate EM simulations are computationally expensive. In this paper, we discuss simulation-driven antenna optimization using surrogate models and adjoint sensitivity. We demonstrate that incorporating sensitivity information into the surrogate model improves the robustness of the optimization process and can also be utilized to reduce its computational cost.
{"title":"Antenna design using surrogate models and adjoint sensitivity","authors":"S. Koziel, S. Ogurtsov","doi":"10.1109/APWC.2012.6324914","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324914","url":null,"abstract":"Design closure aided by electromagnetic (EM) simulations is often a necessary step in the antenna design process. It is also challenging because of the fact that accurate EM simulations are computationally expensive. In this paper, we discuss simulation-driven antenna optimization using surrogate models and adjoint sensitivity. We demonstrate that incorporating sensitivity information into the surrogate model improves the robustness of the optimization process and can also be utilized to reduce its computational cost.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87514856","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324965
B. Cai, Linguo Chai, W. Shangguan, Jian Wang
This paper selects the car following model (CFM) in Cooperative Vehicle Infrastructure System (CVIS) to study. Through the study of the traditional car following model and the problem that in car following model in Paramics the safe distance value is not accurate, we design of a new minimum safe distance car following model based on Paramics car following model and the data exchange in CVIS. And we design the CVIS traffic simulation platform and compare it with the traditional safe distance of the car following model. From the simulation data, we can see that the minimum safety distance car following model based on CVIS is more efficiency.
{"title":"Research on car following model based on cooperative vehicle infrastructure system","authors":"B. Cai, Linguo Chai, W. Shangguan, Jian Wang","doi":"10.1109/APWC.2012.6324965","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324965","url":null,"abstract":"This paper selects the car following model (CFM) in Cooperative Vehicle Infrastructure System (CVIS) to study. Through the study of the traditional car following model and the problem that in car following model in Paramics the safe distance value is not accurate, we design of a new minimum safe distance car following model based on Paramics car following model and the data exchange in CVIS. And we design the CVIS traffic simulation platform and compare it with the traditional safe distance of the car following model. From the simulation data, we can see that the minimum safety distance car following model based on CVIS is more efficiency.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86927562","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324919
J. Fischer, M. Grossmann, W. Felber, M. Landmann, A. Heuberger
For the development of future mobile-to-mobile communication systems, realistic channel models are required. Available models are aiming at broadcasting applications using high antenna towers and are therefore not applicable for mobile-to-mobile applications like mobile ad-hoc networks (MANET). In this paper, measurements of the path loss using car-mounted receiver and transmitter antennas are presented. Based on the measurement results, a new path loss model is proposed. It is shown that this model provides a more realistic prediction of the path loss for MANET systems in the VHF and UHF band than the widely used Okumura-Hata model.
{"title":"A measurement-based path loss model for wireless links in mobile ad-hoc networks (MANET) operating in the VHF and UHF band","authors":"J. Fischer, M. Grossmann, W. Felber, M. Landmann, A. Heuberger","doi":"10.1109/APWC.2012.6324919","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324919","url":null,"abstract":"For the development of future mobile-to-mobile communication systems, realistic channel models are required. Available models are aiming at broadcasting applications using high antenna towers and are therefore not applicable for mobile-to-mobile applications like mobile ad-hoc networks (MANET). In this paper, measurements of the path loss using car-mounted receiver and transmitter antennas are presented. Based on the measurement results, a new path loss model is proposed. It is shown that this model provides a more realistic prediction of the path loss for MANET systems in the VHF and UHF band than the widely used Okumura-Hata model.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83119824","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324943
C. Phongcharoenpanich, K. Boonying, S. Kosulvit, T. Laohapensaeng
This paper presents the design of the dual-band flat antenna operating at 2.45 GHz and 5.25 GHz. This antenna is designed for polarization diversity of wireless LAN application (IEEE 802.11 a/b/g/n). The antenna is operated at dual-band with dual-polarization capability. The prototype flat antenna consists of a plate, a T-step slot, a rectangular slot, a rectangular ring strip, an air gap and a ground plane. The simulation process is done by using the CST Microwave Studio software. The results show the isolations higher than 15 dB that is satisfied the system requirement. The flat antenna is designed to obtain the unidirectional radiation pattern. The maximum gain is higher than 7 dBi.
{"title":"Dual-band flat antenna for polarization diversity with high isolation","authors":"C. Phongcharoenpanich, K. Boonying, S. Kosulvit, T. Laohapensaeng","doi":"10.1109/APWC.2012.6324943","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324943","url":null,"abstract":"This paper presents the design of the dual-band flat antenna operating at 2.45 GHz and 5.25 GHz. This antenna is designed for polarization diversity of wireless LAN application (IEEE 802.11 a/b/g/n). The antenna is operated at dual-band with dual-polarization capability. The prototype flat antenna consists of a plate, a T-step slot, a rectangular slot, a rectangular ring strip, an air gap and a ground plane. The simulation process is done by using the CST Microwave Studio software. The results show the isolations higher than 15 dB that is satisfied the system requirement. The flat antenna is designed to obtain the unidirectional radiation pattern. The maximum gain is higher than 7 dBi.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90840803","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324917
E. Tanghe, L. Martens, W. Joseph, D. Gaillot, M. Liénard, P. Degauque
The estimation accuracy of specular multipath components in radio channels that include dense multipath is investigated. Classical multipath estimation algorithms such as ESPRIT and SAGE do not include dense multipath in their signal model whereas recent ones, such as RiMAX, do. These estimation algorithms are applied to a-priori known synthetic channels which include both specular components (SCs) and dense multipath components (DMC). The estimation errors of the SCs are computed as a function of the DMC power to evaluate the estimator's robustness. The results of this work clearly indicate large estimation errors for the SC parameters when the estimator does not include DMC in its data model.
{"title":"Specular path estimation errors with ESPRIT, SAGE, and RiMAX in the presence of dense multipath","authors":"E. Tanghe, L. Martens, W. Joseph, D. Gaillot, M. Liénard, P. Degauque","doi":"10.1109/APWC.2012.6324917","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324917","url":null,"abstract":"The estimation accuracy of specular multipath components in radio channels that include dense multipath is investigated. Classical multipath estimation algorithms such as ESPRIT and SAGE do not include dense multipath in their signal model whereas recent ones, such as RiMAX, do. These estimation algorithms are applied to a-priori known synthetic channels which include both specular components (SCs) and dense multipath components (DMC). The estimation errors of the SCs are computed as a function of the DMC power to evaluate the estimator's robustness. The results of this work clearly indicate large estimation errors for the SC parameters when the estimator does not include DMC in its data model.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90917606","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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