Pub Date : 2014-04-06DOI: 10.1109/EUCAP.2014.6902159
P. Daskalaki, K. Maliatsos, A. Kanatas
A 5-element ESPAR antenna with a sole active PIFA element and four parasitic ILAs elements is designed for operation at 2.1 GHz. The proposed antenna is suitable for integration in mobile terminals. Reactance loads are connected to the symmetrically-placed parasitic elements in order to achieve beam scanning at desirable directions at both azimuth and elevation plane. Simulation results prove that the proposed antenna is able to produce a variety of patterns with beam steering support at the principle planes. In addition, the proposed antenna behavior in the frequency domain is presented and the input impedance characteristics are analyzed.
{"title":"Design and analysis of a 5-element ESPAR antenna with an active PIFA","authors":"P. Daskalaki, K. Maliatsos, A. Kanatas","doi":"10.1109/EUCAP.2014.6902159","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902159","url":null,"abstract":"A 5-element ESPAR antenna with a sole active PIFA element and four parasitic ILAs elements is designed for operation at 2.1 GHz. The proposed antenna is suitable for integration in mobile terminals. Reactance loads are connected to the symmetrically-placed parasitic elements in order to achieve beam scanning at desirable directions at both azimuth and elevation plane. Simulation results prove that the proposed antenna is able to produce a variety of patterns with beam steering support at the principle planes. In addition, the proposed antenna behavior in the frequency domain is presented and the input impedance characteristics are analyzed.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"112 1","pages":"1864-1868"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77223731","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902016
T. Imai, K. Kitao, Y. Okumura
In mobile communication environments, variations in the reception level are generally modeled based on three components: multi-path fading, shadow fading, and path loss. When extracting variations from measurement data, we must pay attention to the window size in the averaging procedure (and observation range) because characteristics of the extracted variation depend on the window size. However, the appropriate window size is not clear. In this paper, in order to extract precisely (and easily) each variation, we propose a wavelet based analysis, and show the analyzed results based on measurement data in urban macro-cellular environment.
{"title":"Wavelet based analysis of reception level variations in urban mobile communication environment","authors":"T. Imai, K. Kitao, Y. Okumura","doi":"10.1109/EUCAP.2014.6902016","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902016","url":null,"abstract":"In mobile communication environments, variations in the reception level are generally modeled based on three components: multi-path fading, shadow fading, and path loss. When extracting variations from measurement data, we must pay attention to the window size in the averaging procedure (and observation range) because characteristics of the extracted variation depend on the window size. However, the appropriate window size is not clear. In this paper, in order to extract precisely (and easily) each variation, we propose a wavelet based analysis, and show the analyzed results based on measurement data in urban macro-cellular environment.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"22 1","pages":"1307-1311"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80886443","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902332
G. Di Massa, H. O. Moreno, S. Costanzo
A Fabry Perot antenna with improved bandwidth features is proposed in this work. The antenna is fed by a standard waveguide and includes a metallic planar grid of slots as radiating surface. The cavity field is used to compute the equivalent currents on the radiating apertures, obtaining from them the radiated far field. The approach considers an open cavity partially filled with a dielectric substrate, which improves more than 40% the bandwidth when compared to an empty cavity.
{"title":"Fabry-Perot antenna with improved bandwidth","authors":"G. Di Massa, H. O. Moreno, S. Costanzo","doi":"10.1109/EUCAP.2014.6902332","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902332","url":null,"abstract":"A Fabry Perot antenna with improved bandwidth features is proposed in this work. The antenna is fed by a standard waveguide and includes a metallic planar grid of slots as radiating surface. The cavity field is used to compute the equivalent currents on the radiating apertures, obtaining from them the radiated far field. The approach considers an open cavity partially filled with a dielectric substrate, which improves more than 40% the bandwidth when compared to an empty cavity.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"43 1","pages":"2526-2528"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81004202","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6901963
Bjarni Tor Einarsson, A. Hussain, P. Kildal
This paper aims to show how Universal Software Radio Peripheral can be used in conjunction with reverberation chamber to measure throughput of wireless communication systems in Rich Isotropic Multipath environment. The results are in agreement with theories based on the threshold receiver model.
{"title":"Measurements of throughput in reverberation chamber using universal Software Radio Peripheral","authors":"Bjarni Tor Einarsson, A. Hussain, P. Kildal","doi":"10.1109/EUCAP.2014.6901963","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6901963","url":null,"abstract":"This paper aims to show how Universal Software Radio Peripheral can be used in conjunction with reverberation chamber to measure throughput of wireless communication systems in Rich Isotropic Multipath environment. The results are in agreement with theories based on the threshold receiver model.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"11 1","pages":"1105-1108"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81074555","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902047
Min Zhou, S. Sorensen, P. Meincke, E. Jørgensen
The design and optimization of multi-faceted reflect-arrays for satellite applications are presented. The objective of this work is to investigate the performance of a multi-faceted reflectarray designed using a direct optimization technique. To this end, a single-layer multi-faceted reflectarray, that produces a contoured beam for a European coverage in a bandwidth of 17% has been designed. The performance is compared to that of a planar reflectarray as well as a shaped reflector. In the considered frequency range, the co-polar minimum directivity within the coverage of the multi-faceted reflectarray surpasses that of its planar counterpart with more than 1dB. Compared to the shaped reflector, the difference between the co-polar minimum directivity of the multi-faceted reflectarray and the shaped reflector is only 0.3 dB. To improve the cross-polar radiation of the multi-faceted reflectarray, cross-polar suppression is included in the optimization and the minimum cross polar discrimination of the optimized reflectarray is improved with 2.3dB without any degradation of the co-polar radiation.
{"title":"Design and optimization of multi-faceted reflectarrays for satellite applications","authors":"Min Zhou, S. Sorensen, P. Meincke, E. Jørgensen","doi":"10.1109/EUCAP.2014.6902047","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902047","url":null,"abstract":"The design and optimization of multi-faceted reflect-arrays for satellite applications are presented. The objective of this work is to investigate the performance of a multi-faceted reflectarray designed using a direct optimization technique. To this end, a single-layer multi-faceted reflectarray, that produces a contoured beam for a European coverage in a bandwidth of 17% has been designed. The performance is compared to that of a planar reflectarray as well as a shaped reflector. In the considered frequency range, the co-polar minimum directivity within the coverage of the multi-faceted reflectarray surpasses that of its planar counterpart with more than 1dB. Compared to the shaped reflector, the difference between the co-polar minimum directivity of the multi-faceted reflectarray and the shaped reflector is only 0.3 dB. To improve the cross-polar radiation of the multi-faceted reflectarray, cross-polar suppression is included in the optimization and the minimum cross polar discrimination of the optimized reflectarray is improved with 2.3dB without any degradation of the co-polar radiation.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"27 1","pages":"1423-1427"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78010248","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902462
E. Bekele, G. Oliveri, J. Turpin, D. Werner, A. Massa
This paper presents synthesis of conformal arrays enhanced by metamaterial lenses. The synthesis uses a multi-step Quasi-Conformal Transformation Optics technique to compute lens parameters that allow an arbitrary-shaped conformal array to acquire properties of another desirable conformal array. The approach is demonstrated by numerical experiments including a full wave simulation.
{"title":"Design of metamaterial-coated arrays through quasi-conformal transformation optics","authors":"E. Bekele, G. Oliveri, J. Turpin, D. Werner, A. Massa","doi":"10.1109/EUCAP.2014.6902462","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902462","url":null,"abstract":"This paper presents synthesis of conformal arrays enhanced by metamaterial lenses. The synthesis uses a multi-step Quasi-Conformal Transformation Optics technique to compute lens parameters that allow an arbitrary-shaped conformal array to acquire properties of another desirable conformal array. The approach is demonstrated by numerical experiments including a full wave simulation.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"27 1","pages":"3013-3016"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78063236","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902090
L. Kanaris, Akis Kokkinis, M. Raspopoulos, A. Liotta, S. Stavrou
The objective of this research work is to investigate and demonstrate potential accuracy improvements in the RSS indoor positioning process, by introducing directional antennas in the radio network infrastructure. The position and orientation is selected in such a way as to decrease the correlation levels of the Received Signal Strength (RSS) fingerprints which form the radio-map. Localization algorithms are expected to perform better with reduced correlation level, thus reducing the positioning error. Due to the necessity to generate several radio-maps for the setup and environment of interest, the use of 3D ray tracing (RT) to construct the radio-maps is proposed, instead of carrying out time consuming and expensive radio measurement campaigns. The approach was evaluated in an indoor environment and the results obtained, suggest a significant reduction of the positioning error.
{"title":"Improving RSS fingerprint-based localization using directional antennas","authors":"L. Kanaris, Akis Kokkinis, M. Raspopoulos, A. Liotta, S. Stavrou","doi":"10.1109/EUCAP.2014.6902090","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902090","url":null,"abstract":"The objective of this research work is to investigate and demonstrate potential accuracy improvements in the RSS indoor positioning process, by introducing directional antennas in the radio network infrastructure. The position and orientation is selected in such a way as to decrease the correlation levels of the Received Signal Strength (RSS) fingerprints which form the radio-map. Localization algorithms are expected to perform better with reduced correlation level, thus reducing the positioning error. Due to the necessity to generate several radio-maps for the setup and environment of interest, the use of 3D ray tracing (RT) to construct the radio-maps is proposed, instead of carrying out time consuming and expensive radio measurement campaigns. The approach was evaluated in an indoor environment and the results obtained, suggest a significant reduction of the positioning error.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"28 1","pages":"1593-1597"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73355898","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902421
E. Georget, R. Abdeddaim, P. Sabouroux
This paper presents a new method to design a multi-band antenna. The aim is to realize an antenna with dipolar radiations at several resonance frequencies. We study a monopole antenna that naturally exhibits a dipole and a quadrupole mode for the first and second resonance frequency respectively. In order to change the quadrupole mode into a dipole mode, two parasitic resonant elements are added to the antenna. This behavior is studied in near field and in far field. In this paper, a monopole on flexible substrate is studied.
{"title":"A complete study of flexible antennas in near field and far field","authors":"E. Georget, R. Abdeddaim, P. Sabouroux","doi":"10.1109/EUCAP.2014.6902421","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902421","url":null,"abstract":"This paper presents a new method to design a multi-band antenna. The aim is to realize an antenna with dipolar radiations at several resonance frequencies. We study a monopole antenna that naturally exhibits a dipole and a quadrupole mode for the first and second resonance frequency respectively. In order to change the quadrupole mode into a dipole mode, two parasitic resonant elements are added to the antenna. This behavior is studied in near field and in far field. In this paper, a monopole on flexible substrate is studied.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"15 1","pages":"2850-2853"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82374883","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902623
K. Briggs, Jamie Fairbrother
The secondary use of television spectrum (TV whitespace) by low-power radio devices is now a reality in the UK and the USA. The UK regulator Ofcom has released rules for computation of maximum allowed transmit power. These rules, however, allow some leeway for different algorithms for internal steps, and one would like to exploit this leeway to the advantage of secondary users, while still protecting the primary user to the required degree. We describe here two techniques implemented in a current BT software product, which additionally allows a compute-on-demand mode of operation, in distinction to so-called TV whitespace databases which merely look up pre-computed tables.
{"title":"Enhanced algorithms for TV whitespace power maximization","authors":"K. Briggs, Jamie Fairbrother","doi":"10.1109/EUCAP.2014.6902623","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902623","url":null,"abstract":"The secondary use of television spectrum (TV whitespace) by low-power radio devices is now a reality in the UK and the USA. The UK regulator Ofcom has released rules for computation of maximum allowed transmit power. These rules, however, allow some leeway for different algorithms for internal steps, and one would like to exploit this leeway to the advantage of secondary users, while still protecting the primary user to the required degree. We describe here two techniques implemented in a current BT software product, which additionally allows a compute-on-demand mode of operation, in distinction to so-called TV whitespace databases which merely look up pre-computed tables.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"36 1","pages":"3657-3661"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82449720","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902503
Sofia Bakogianni, S. Koulouridis
In this study, a human tissue-implantable compact folded dipole antenna of 19.6 * 2 * 0.254 mm3 operating in the Medical Implant Communication Service (MICS) frequency band (402-405 MHz) is presented. The antenna design and analysis is carried out inside a homogeneous flat phantom with electrical properties equivalent to those of 2/3 human muscle tissue. The dipole antenna, printed on a high-dielectric substrate layer, exhibits a frequency resonance at 402 MHz with a wide 10-dB impedance bandwidth of 105 MHz. The proposed antenna radiates an omnidirectional far-field radiation pattern with a maximum realized gain of -31.2 dB. In addition, the Specific Absorption Rate (SAR) assessment indicates the maximum input power deliverable to the antenna in order to meet the required safety regulations.
{"title":"Design of a novel compact printed folded dipole antenna for biomedical applications","authors":"Sofia Bakogianni, S. Koulouridis","doi":"10.1109/EUCAP.2014.6902503","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902503","url":null,"abstract":"In this study, a human tissue-implantable compact folded dipole antenna of 19.6 * 2 * 0.254 mm3 operating in the Medical Implant Communication Service (MICS) frequency band (402-405 MHz) is presented. The antenna design and analysis is carried out inside a homogeneous flat phantom with electrical properties equivalent to those of 2/3 human muscle tissue. The dipole antenna, printed on a high-dielectric substrate layer, exhibits a frequency resonance at 402 MHz with a wide 10-dB impedance bandwidth of 105 MHz. The proposed antenna radiates an omnidirectional far-field radiation pattern with a maximum realized gain of -31.2 dB. In addition, the Specific Absorption Rate (SAR) assessment indicates the maximum input power deliverable to the antenna in order to meet the required safety regulations.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"18 1","pages":"3178-3182"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82539201","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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