Pub Date : 2017-03-01DOI: 10.1109/IWAT.2017.7915385
Jianyu Lin, Dongying Li
A zero-index metamaterial unit cell working over a wide frequency band is presented. A three layer superstrate with metamaterial unit cells arranged in a 5 by 5 array is designed and placed over a mircostrip patch antenna with U-slot for antenna gain enhancement. The simulation results show that the gain of the metamaterial antenna is improved by nearly 4 dB throughout the operating band.
{"title":"A high-gain antenna with U-slot using zero-index metamaterial superstrate","authors":"Jianyu Lin, Dongying Li","doi":"10.1109/IWAT.2017.7915385","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915385","url":null,"abstract":"A zero-index metamaterial unit cell working over a wide frequency band is presented. A three layer superstrate with metamaterial unit cells arranged in a 5 by 5 array is designed and placed over a mircostrip patch antenna with U-slot for antenna gain enhancement. The simulation results show that the gain of the metamaterial antenna is improved by nearly 4 dB throughout the operating band.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125364467","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915374
Q. Luo, S. Gao
Smart antennas are important for SATCOM on-the-move (SOTM) because they can increase the channel capacity and coverage range of the communication systems. Firstly, this paper briefly reviews the state-of-art on the smart antenna design for SOTM applications. Different types of antenna for SOTM are discussed. Then, two design examples from the recent collaborated research work from the University of Kent are presented. One is a Ka-band low-cost beam scanning folded reflectarray. This reflectarray uses the dual-polarized slot antenna with multi-layered PCB structure as the unit cell and scans its beam within large angle range. Another design example is a Ku-band low cost dual polarized reconfigurable reflectarray with single bit phase control by using PIN diodes. For both design examples, measurement results are given to show their good beam scanning performance.
{"title":"Smart antennas for satellite communications on the move","authors":"Q. Luo, S. Gao","doi":"10.1109/IWAT.2017.7915374","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915374","url":null,"abstract":"Smart antennas are important for SATCOM on-the-move (SOTM) because they can increase the channel capacity and coverage range of the communication systems. Firstly, this paper briefly reviews the state-of-art on the smart antenna design for SOTM applications. Different types of antenna for SOTM are discussed. Then, two design examples from the recent collaborated research work from the University of Kent are presented. One is a Ka-band low-cost beam scanning folded reflectarray. This reflectarray uses the dual-polarized slot antenna with multi-layered PCB structure as the unit cell and scans its beam within large angle range. Another design example is a Ku-band low cost dual polarized reconfigurable reflectarray with single bit phase control by using PIN diodes. For both design examples, measurement results are given to show their good beam scanning performance.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"22 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120990110","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915281
A. Díaz-Rubio, V. Asadchy, A. Elsakka, S. Tretyakov
By controlling the surface reactance of impenetrable gradient metasurfaces it is possible to shape the phase front of reflected waves. This approach is similar to that used in conventional reflectarray antennas, where the phase of reflection from each array element is properly tuned. However, such phase-gradient reflectors always produce some parasitic scattering into unwanted directions. Here we present our recent results on non-local (spatially dispersive) gradient metasurfaces which do not have this drawback and demonstrate perfect anomalous reflection of incident plane waves into any desired direction.
{"title":"Metasurfaces for perfect control of reflection","authors":"A. Díaz-Rubio, V. Asadchy, A. Elsakka, S. Tretyakov","doi":"10.1109/IWAT.2017.7915281","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915281","url":null,"abstract":"By controlling the surface reactance of impenetrable gradient metasurfaces it is possible to shape the phase front of reflected waves. This approach is similar to that used in conventional reflectarray antennas, where the phase of reflection from each array element is properly tuned. However, such phase-gradient reflectors always produce some parasitic scattering into unwanted directions. Here we present our recent results on non-local (spatially dispersive) gradient metasurfaces which do not have this drawback and demonstrate perfect anomalous reflection of incident plane waves into any desired direction.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131328901","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915316
P. Dankov
The paper considers the problems of the dielectric anisotropy and determination of so-called equivalent dielectric constant of different planar transmission lines on anisotropic substrates, when they have been covered with dielectric overlays with open or shielded top surfaces. The idea is to investigate the possibilities for direct measurements of the equivalent dielectric constants for microstrip lines and coplanar waveguides by covering with thick enough dielectric overlays from the same material. A direct method has been proposed for determination of a set of three equivalent parameters of microwave substrates, applicable for more accurate 3D design of MW planar structures.
{"title":"A method for determination of equivalent dielectric constant of planar transmission lines on anisotropic substrates with dielectric overlay","authors":"P. Dankov","doi":"10.1109/IWAT.2017.7915316","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915316","url":null,"abstract":"The paper considers the problems of the dielectric anisotropy and determination of so-called equivalent dielectric constant of different planar transmission lines on anisotropic substrates, when they have been covered with dielectric overlays with open or shielded top surfaces. The idea is to investigate the possibilities for direct measurements of the equivalent dielectric constants for microstrip lines and coplanar waveguides by covering with thick enough dielectric overlays from the same material. A direct method has been proposed for determination of a set of three equivalent parameters of microwave substrates, applicable for more accurate 3D design of MW planar structures.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125600502","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915292
M. Wahib, A. Freundorfer, Y. Antar
This paper presents the design of a planar Quasi-Yagi antenna capable of achieving high Front-to-Back ratio (i.e. FTBR > 34 dB), high gain (i.e. > 6.4 dBi) and relatively wide bandwidth (i.e. up to almost 1 GHz). This antenna is designed to cover the 2.45 GHz ISM band. The overall dimensions of the antenna are 69 × 64 × 1.575 mm3. The antenna is made up of 5 director elements, 1 driven dipole and a reflector ground plane. Wide bandwidth is made possible through the strong coupling of the first director element and the driven dipole element. The antenna is optimized in order to achieve the above mentioned performance criteria. This antenna can be very useful for applications requiring highly directive radiation patterns such as point-to-point communications and wireless power transfer. The radiation characteristics of this antenna can be further enhanced by building a phased array based on it.
{"title":"A planar wideband Quasi-Yagi antenna with high gain and FTBR","authors":"M. Wahib, A. Freundorfer, Y. Antar","doi":"10.1109/IWAT.2017.7915292","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915292","url":null,"abstract":"This paper presents the design of a planar Quasi-Yagi antenna capable of achieving high Front-to-Back ratio (i.e. FTBR > 34 dB), high gain (i.e. > 6.4 dBi) and relatively wide bandwidth (i.e. up to almost 1 GHz). This antenna is designed to cover the 2.45 GHz ISM band. The overall dimensions of the antenna are 69 × 64 × 1.575 mm3. The antenna is made up of 5 director elements, 1 driven dipole and a reflector ground plane. Wide bandwidth is made possible through the strong coupling of the first director element and the driven dipole element. The antenna is optimized in order to achieve the above mentioned performance criteria. This antenna can be very useful for applications requiring highly directive radiation patterns such as point-to-point communications and wireless power transfer. The radiation characteristics of this antenna can be further enhanced by building a phased array based on it.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115304533","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915288
Z. Jiang, W. Hong
This paper presents a rigorous analysis of the input impedance of a monopole antenna surrounded by a finite-height tensor impedance surface coating using the modal-expansion method. The tensor impedance surface is approximated by a thin anisotropic slab for facilitating the analysis. In addition, practical coaxial feedline was considered in the modeling. Based on the field expressions for all the sub-regions of the entire structure, the expansion coefficients can be determined by enforcing the tangential field continuity conditions across the boundaries in between adjacent sub-regions. The results calculated by the proposed approach are in a strong agreement with those obtained from commercial full-wave simulators. The proposed method provides a much faster solution and consumes less memory, making it highly useful for further exploration and optimization synthesis of integrated tensor impedance surface coated monopole antennas for a variety of applications.
{"title":"Modal-expansion analysis of monopole antennas coated by a finite-height tensor impedance surface","authors":"Z. Jiang, W. Hong","doi":"10.1109/IWAT.2017.7915288","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915288","url":null,"abstract":"This paper presents a rigorous analysis of the input impedance of a monopole antenna surrounded by a finite-height tensor impedance surface coating using the modal-expansion method. The tensor impedance surface is approximated by a thin anisotropic slab for facilitating the analysis. In addition, practical coaxial feedline was considered in the modeling. Based on the field expressions for all the sub-regions of the entire structure, the expansion coefficients can be determined by enforcing the tangential field continuity conditions across the boundaries in between adjacent sub-regions. The results calculated by the proposed approach are in a strong agreement with those obtained from commercial full-wave simulators. The proposed method provides a much faster solution and consumes less memory, making it highly useful for further exploration and optimization synthesis of integrated tensor impedance surface coated monopole antennas for a variety of applications.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114367475","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915348
A. Diet, S. Koulouridis, Y. Le Bihan, Q.-T. Luu, O. Meyer, L. Pichon, M. Biancheri-Astier
This paper presents some measurements and simulations results in which small helicoidally coils are designed, in the idea to provide a RF power transfer for implanted medical devices (IMDs). In such context, the coils should be very small if they are implanted within devices, or even if they are used as an alternate solution combined with UHF antennas (ex. PIFA). The influence of the body and the mandatory small size of the coils bring a difficult technological lock concerning efficiency and measurements accuracy which must validate our simulations. In this paper, a deembedding technique is used to take into account the dedicated test fixture, and further works will investigate the electromagnetic influence of a liquid phantom, modeling the muscle tissue.
{"title":"Sub-GHz inductive power transmission from helical coils for implanted medical devices","authors":"A. Diet, S. Koulouridis, Y. Le Bihan, Q.-T. Luu, O. Meyer, L. Pichon, M. Biancheri-Astier","doi":"10.1109/IWAT.2017.7915348","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915348","url":null,"abstract":"This paper presents some measurements and simulations results in which small helicoidally coils are designed, in the idea to provide a RF power transfer for implanted medical devices (IMDs). In such context, the coils should be very small if they are implanted within devices, or even if they are used as an alternate solution combined with UHF antennas (ex. PIFA). The influence of the body and the mandatory small size of the coils bring a difficult technological lock concerning efficiency and measurements accuracy which must validate our simulations. In this paper, a deembedding technique is used to take into account the dedicated test fixture, and further works will investigate the electromagnetic influence of a liquid phantom, modeling the muscle tissue.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121043004","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915289
Nicolas Brechet, Galatée Ginestet, Jeremie Torres, E. Moradi, L. Ukkonen, T. Björninen, J. Virkki
Embroidery is an efficient method for the fabrication of textile antennas. We studied the effects of reducing the amount of conductive thread to achieve savings in material costs and the effects of the sewing pattern on the wireless performance of embroidered passive UHF RFID tags on two different fabric substrates. The antennas were sewed on cotton and polyamide fabrics, the ICs were attached to the embroidered antennas with a conductive adhesive, and the wireless performance of the ready-made textile RFID tags was evaluated through measurements. The fabric parameters were found to have a major effect on the tag performance. Based on our results, significant amounts of time and conductive yarn can be saved in the embroidery of RFID tag antennas by only partially sewing the tag antenna.
{"title":"Cost- and time-effective sewing patterns for embroidered passive UHF RFID tags","authors":"Nicolas Brechet, Galatée Ginestet, Jeremie Torres, E. Moradi, L. Ukkonen, T. Björninen, J. Virkki","doi":"10.1109/IWAT.2017.7915289","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915289","url":null,"abstract":"Embroidery is an efficient method for the fabrication of textile antennas. We studied the effects of reducing the amount of conductive thread to achieve savings in material costs and the effects of the sewing pattern on the wireless performance of embroidered passive UHF RFID tags on two different fabric substrates. The antennas were sewed on cotton and polyamide fabrics, the ICs were attached to the embroidered antennas with a conductive adhesive, and the wireless performance of the ready-made textile RFID tags was evaluated through measurements. The fabric parameters were found to have a major effect on the tag performance. Based on our results, significant amounts of time and conductive yarn can be saved in the embroidery of RFID tag antennas by only partially sewing the tag antenna.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126813366","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915391
Konstantinos N. Alvertos, E. Karagianni, Konstantinos D. Vardakis, Thomas K. Mpountas, D. Kaklamani
within this paper the use of Wi-Fi in air and underwater environment using the channels around the 2.4 GHz frequency range that have been standardized worldwide, is presented through simulation and experimental work. Using a bow-tie shaped antenna we study the actual signal strength between underwater and air conditions, while changing the distance between two devices, wirelessly connected with each other.
{"title":"Bow-tie antenna for underwater Wireless Sensor Networks","authors":"Konstantinos N. Alvertos, E. Karagianni, Konstantinos D. Vardakis, Thomas K. Mpountas, D. Kaklamani","doi":"10.1109/IWAT.2017.7915391","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915391","url":null,"abstract":"within this paper the use of Wi-Fi in air and underwater environment using the channels around the 2.4 GHz frequency range that have been standardized worldwide, is presented through simulation and experimental work. Using a bow-tie shaped antenna we study the actual signal strength between underwater and air conditions, while changing the distance between two devices, wirelessly connected with each other.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"49 18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115341470","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 : 2017-03-01DOI: 10.1109/IWAT.2017.7915284
Zhi Ning Chen, Wei E. I. Liu, X. Qing
We present the recent progress in developing the mushroom and metasurface antennas for low-profile and broadband applications. The metamaterial-based mushroom antenna technology is first developed to realize broadband boresight-radiation with low profile on PCB and LTCC substrates operating from microwave to millimeter-wave bands. As a variation of the original mushroom antenna, vialess metasurface antennas are proposed along with miniaturization technique. Finally, the shorting-wall loaded mushroom antenna with new operating mechanism is reported as well.
{"title":"Low-profile broadband mushroom and metasurface antennas","authors":"Zhi Ning Chen, Wei E. I. Liu, X. Qing","doi":"10.1109/IWAT.2017.7915284","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915284","url":null,"abstract":"We present the recent progress in developing the mushroom and metasurface antennas for low-profile and broadband applications. The metamaterial-based mushroom antenna technology is first developed to realize broadband boresight-radiation with low profile on PCB and LTCC substrates operating from microwave to millimeter-wave bands. As a variation of the original mushroom antenna, vialess metasurface antennas are proposed along with miniaturization technique. Finally, the shorting-wall loaded mushroom antenna with new operating mechanism is reported as well.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133387016","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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