Pub Date : 2017-03-01DOI: 10.1109/IWAT.2017.7915287
S. Ta, I. Park
This paper describes a low-profile broadband 2×2 metasurface-based circularly polarized (CP) array antenna using a sequentially rotated series-parallel feed. The single element is a truncated corner square patch sandwiched between the ground plane and the metasurface of a lattice of 4×4 metal plates. These antennas are incorporated with the feeding network to achieve broadband operation. The 2×2 metasurface-based array antenna with an overall size of 64 mm × 64 mm × 2.34 mm (∼1.17λ0 × 1.17λ0 × 0.043λ0 at 5.5 GHz) has a |S11| < −10 dB bandwidth of 4.56–6.98 GHz (41.94%) and 3-dB axial ratio bandwidth of 4.67–6.39 GHz (31.1%). The array antenna yields a broadside left-hand CP radiation with a peak gain of 11.6 dBic, a 3-dB gain bandwidth of 4.67–6.36 GHz (30.6%), and a radiation efficiency of > 88%.
{"title":"Metasurface-based circularly polarized patch array antenna using sequential phase feed","authors":"S. Ta, I. Park","doi":"10.1109/IWAT.2017.7915287","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915287","url":null,"abstract":"This paper describes a low-profile broadband 2×2 metasurface-based circularly polarized (CP) array antenna using a sequentially rotated series-parallel feed. The single element is a truncated corner square patch sandwiched between the ground plane and the metasurface of a lattice of 4×4 metal plates. These antennas are incorporated with the feeding network to achieve broadband operation. The 2×2 metasurface-based array antenna with an overall size of 64 mm × 64 mm × 2.34 mm (∼1.17λ<inf>0</inf> × 1.17λ<inf>0</inf> × 0.043λ<inf>0</inf> at 5.5 GHz) has a |S<inf>11</inf>| < −10 dB bandwidth of 4.56–6.98 GHz (41.94%) and 3-dB axial ratio bandwidth of 4.67–6.39 GHz (31.1%). The array antenna yields a broadside left-hand CP radiation with a peak gain of 11.6 dBic, a 3-dB gain bandwidth of 4.67–6.36 GHz (30.6%), and a radiation efficiency of > 88%.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"106 4 Pt 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":"115048444","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.2017.7915343
A. Solovey
Theoretical limitations on shielding and reflective properties of a thin passive microwave magneto-dielectric metamaterial absorber layer that follow solely from the boundary conditions were numerically investigated.
数值研究了仅受边界条件影响的无源微波磁介电超材料薄吸收层的屏蔽和反射性能的理论限制。
{"title":"Theoretical limitations on shielding and reflective properties of microwave metamaterial absorbers","authors":"A. Solovey","doi":"10.1109/IWAT.2017.7915343","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915343","url":null,"abstract":"Theoretical limitations on shielding and reflective properties of a thin passive microwave magneto-dielectric metamaterial absorber layer that follow solely from the boundary conditions were numerically investigated.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"207 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":"121864649","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.2017.7915327
J. Kowalewski, S. Peukert, T. Mahler, Jonathan Mayer, T. Zwick
Within the scope of this work, a reconfigurable antenna for automotive applications has been developed and constructed. The concept of planar parasitic array has been chosen due to its size. Furthermore, as an improvement to this concept, the parasitic elements were also used as active radiators. The antenna realizes four reconfigurable patterns that cover the angular regions in and against the driving direction as well as those orthogonal to the driving direction. Additionally a DC feeding network using metamaterials to decrease its influence on antenna characteristics is proposed. The measurement results match the simulated results and maximal gain of about 8.5 dBi is obtained.
{"title":"A trident like antenna with reconfigurable patterns for automotive applications","authors":"J. Kowalewski, S. Peukert, T. Mahler, Jonathan Mayer, T. Zwick","doi":"10.1109/IWAT.2017.7915327","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915327","url":null,"abstract":"Within the scope of this work, a reconfigurable antenna for automotive applications has been developed and constructed. The concept of planar parasitic array has been chosen due to its size. Furthermore, as an improvement to this concept, the parasitic elements were also used as active radiators. The antenna realizes four reconfigurable patterns that cover the angular regions in and against the driving direction as well as those orthogonal to the driving direction. Additionally a DC feeding network using metamaterials to decrease its influence on antenna characteristics is proposed. The measurement results match the simulated results and maximal gain of about 8.5 dBi is obtained.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"37 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":"126966496","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.2017.7915329
C. Mao, S. Gao, T. Rommel
In this paper, a novel low profile aperture-shared X/Ka-band dual-polarized antenna array is proposed for spaceborne digital beamforming (DBF) synthetic aperture radar (SAR) applications. To begin with, the DBF concept and its operation mechanism for SAR system are discussed. In this work, every 2 × 2 Ka-band elements are combined as a subarray and connected to a channel while each one X-band element is connected to a channel. Then, a novel slot-antenna based on substrate-integrated-cavity (SIC) is proposed. The resonant frequency can be controlled by adjusting the length of the U-shaped slot. To share a same aperture, the X-band antenna is interlaced with the Ka-band subarray on the same plane. To verify the concept, an antenna operating at 9.6/35.75 GHz is designed, prototyped and tested. The results demonstrate good performance in terms of impedance matching, channel isolation, and cross polarization level. Such highly integrated low profile antenna can significantly reduce the potential cost of the DBF-SAR system.
{"title":"Low-profile aperture-shared X/Ka-band dual-polarized antenna for DBF-SAR applications","authors":"C. Mao, S. Gao, T. Rommel","doi":"10.1109/IWAT.2017.7915329","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915329","url":null,"abstract":"In this paper, a novel low profile aperture-shared X/Ka-band dual-polarized antenna array is proposed for spaceborne digital beamforming (DBF) synthetic aperture radar (SAR) applications. To begin with, the DBF concept and its operation mechanism for SAR system are discussed. In this work, every 2 × 2 Ka-band elements are combined as a subarray and connected to a channel while each one X-band element is connected to a channel. Then, a novel slot-antenna based on substrate-integrated-cavity (SIC) is proposed. The resonant frequency can be controlled by adjusting the length of the U-shaped slot. To share a same aperture, the X-band antenna is interlaced with the Ka-band subarray on the same plane. To verify the concept, an antenna operating at 9.6/35.75 GHz is designed, prototyped and tested. The results demonstrate good performance in terms of impedance matching, channel isolation, and cross polarization level. Such highly integrated low profile antenna can significantly reduce the potential cost of the DBF-SAR system.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"79 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":"130924769","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.2017.7915328
T. Mahler, D. Müller, J. Eisenbeis, Christian von Vangerow, Sören Marahrens, T. Zwick
In this paper multiple input multiple output (MIMO) channels are considered that are subject to tolerances. The deviations in amplitude and phase that occur at the transmitter and at the receiver are investigated. The resulting MIMO systems with different calibrations are evaluated in terms of the corresponding MIMO channel capacities and their suitability for beamforming-based evaluations as they are applied in e.g. communication over spatial multiplexing (SM) or direction of arrival (DOA) or direction of departure (DOD) estimation. The results reveal that some of the deviations have an impact on the evaluation of the channel capacity and on the beamforming (BF) but others are negligible because they are canceled during the processing. The negligible ones allow for savings in effort and computation both in MIMO channel determination systems like channel measurement systems and channel simulators and in communication systems.
{"title":"Channel capacity and beamforming issues in MIMO channels subject to tolerances","authors":"T. Mahler, D. Müller, J. Eisenbeis, Christian von Vangerow, Sören Marahrens, T. Zwick","doi":"10.1109/IWAT.2017.7915328","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915328","url":null,"abstract":"In this paper multiple input multiple output (MIMO) channels are considered that are subject to tolerances. The deviations in amplitude and phase that occur at the transmitter and at the receiver are investigated. The resulting MIMO systems with different calibrations are evaluated in terms of the corresponding MIMO channel capacities and their suitability for beamforming-based evaluations as they are applied in e.g. communication over spatial multiplexing (SM) or direction of arrival (DOA) or direction of departure (DOD) estimation. The results reveal that some of the deviations have an impact on the evaluation of the channel capacity and on the beamforming (BF) but others are negligible because they are canceled during the processing. The negligible ones allow for savings in effort and computation both in MIMO channel determination systems like channel measurement systems and channel simulators and in communication systems.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"6 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":"122261393","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.2017.7915291
A. T. Baklezos, C. D. Nikolopoulos, C. Capsalis, S. Tsatalas
Link speed and code word length in spacecraft digital systems have a critical effect on equipment design in terms of operation and electromagnetic interference. In this work the behavior of a Low Voltage Differential Signaling / Spacewire link is evaluated through radiated as well as signal spectrum measurements. Various pulse frequencies and pattern lengths were tested and the results indicate that higher pulse frequencies increase the radiated emissions of the system. Radiated emissions are also affected by pattern length, due to the fact that the magnitude and the spacing of the spectral lines vary as the code word length increases.
{"title":"Effect of LVDS link speed and pattern length on spectrum measurements of a Spacewire harness","authors":"A. T. Baklezos, C. D. Nikolopoulos, C. Capsalis, S. Tsatalas","doi":"10.1109/IWAT.2017.7915291","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915291","url":null,"abstract":"Link speed and code word length in spacecraft digital systems have a critical effect on equipment design in terms of operation and electromagnetic interference. In this work the behavior of a Low Voltage Differential Signaling / Spacewire link is evaluated through radiated as well as signal spectrum measurements. Various pulse frequencies and pattern lengths were tested and the results indicate that higher pulse frequencies increase the radiated emissions of the system. Radiated emissions are also affected by pattern length, due to the fact that the magnitude and the spacing of the spectral lines vary as the code word length increases.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"98 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":"126071307","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.2017.7915393
Hongwei Wang, Guangli Yang
In this paper, a novel design of 4×4 microstrip Quasi-Yagi beam-steering antenna array operation at 3.5GHz for future 5G vehicle applications is proposed. This array consists of sixteen element antennas with dimension of 374×374×1.15mm3, which exhibits good bandwidth (impedance bandwidth of single antenna element about 440MHz for S11 less than −10dB at the center frequency of 3.5GHz) and high gain (for single antenna about 7dBi and for antenna array about 5.8∶8.76dBi). The beam-steering characteristics in the operation band can nearly achieve omni-directional radiation.
{"title":"Design of 4×4 microstrip Quasi-Yagi beam-steering antenna array operation at 3.5GHz for future 5G vehicle applications","authors":"Hongwei Wang, Guangli Yang","doi":"10.1109/IWAT.2017.7915393","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915393","url":null,"abstract":"In this paper, a novel design of 4×4 microstrip Quasi-Yagi beam-steering antenna array operation at 3.5GHz for future 5G vehicle applications is proposed. This array consists of sixteen element antennas with dimension of 374×374×1.15mm3, which exhibits good bandwidth (impedance bandwidth of single antenna element about 440MHz for S11 less than −10dB at the center frequency of 3.5GHz) and high gain (for single antenna about 7dBi and for antenna array about 5.8∶8.76dBi). The beam-steering characteristics in the operation band can nearly achieve omni-directional radiation.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"110 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":"121133555","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.2017.7915283
D. Sounas, A. Alú
We introduce non-reciprocal metasurfaces based on non-linear effects, allowing signal transmission from one direction to another, but not the other way around. We also present a particular design at THz frequencies, suitable for breaking reciprocity of wave reflection. Compared to other approaches for breaking reciprocity, non-linear metasurfaces have the significant advantage of not relying on any form of external bias and they can be used for the protection of sources or other sensitive equipment from strong external signals.
{"title":"Non-reciprocal wave manipulation with non-linear metasurfaces","authors":"D. Sounas, A. Alú","doi":"10.1109/IWAT.2017.7915283","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915283","url":null,"abstract":"We introduce non-reciprocal metasurfaces based on non-linear effects, allowing signal transmission from one direction to another, but not the other way around. We also present a particular design at THz frequencies, suitable for breaking reciprocity of wave reflection. Compared to other approaches for breaking reciprocity, non-linear metasurfaces have the significant advantage of not relying on any form of external bias and they can be used for the protection of sources or other sensitive equipment from strong external signals.","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":"116224188","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.2017.7915330
Markus H. Novak, J. Volakis, F. Miranda
Next generation 5G mobile architectures will take advantage of the millimeter-wave spectrum to deliver unprecedented bandwidth. Concurrently, there is a need to consolidate numerous disparate allocations into a single, multi-functional array. Existing arrays are either narrow-band, prohibitively expensive or cannot be scaled to these frequencies. In this paper, we present the first ultra-wideband millimeter-wave array to operate across the six 5G and ISM bands spanning 24−71 GHz. Critically, the array is realized using low-cost PCB. The design concept and optimized layout are presented, and fabrication and measurement considerations are discussed.
{"title":"Ultra-wideband array in PCB for millimeter-wave 5G and ISM","authors":"Markus H. Novak, J. Volakis, F. Miranda","doi":"10.1109/IWAT.2017.7915330","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915330","url":null,"abstract":"Next generation 5G mobile architectures will take advantage of the millimeter-wave spectrum to deliver unprecedented bandwidth. Concurrently, there is a need to consolidate numerous disparate allocations into a single, multi-functional array. Existing arrays are either narrow-band, prohibitively expensive or cannot be scaled to these frequencies. In this paper, we present the first ultra-wideband millimeter-wave array to operate across the six 5G and ISM bands spanning 24−71 GHz. Critically, the array is realized using low-cost PCB. The design concept and optimized layout are presented, and fabrication and measurement considerations are discussed.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"57 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":"126546579","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.2017.7915357
Shereen Alaa AbdelBaky, H. Hammad
This letter presents a new design of an ultra-wideband Elliptical Antipodal Vivaldi antenna with elliptical tapered slot edge and circular loads. A new empirical formula for the ground structure was proposed for ease of design. The fabricated prototype has proven better low cut-off frequency performance in term of return loss, gain and radiation pattern throughout a bandwidth from 730 MHz to over 20 GHz with good radiation characteristics.
{"title":"Modified Elliptical Antipodal Vivaldi Antenna with Elliptical Tapered Slot Edge and Circular loads","authors":"Shereen Alaa AbdelBaky, H. Hammad","doi":"10.1109/IWAT.2017.7915357","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915357","url":null,"abstract":"This letter presents a new design of an ultra-wideband Elliptical Antipodal Vivaldi antenna with elliptical tapered slot edge and circular loads. A new empirical formula for the ground structure was proposed for ease of design. The fabricated prototype has proven better low cut-off frequency performance in term of return loss, gain and radiation pattern throughout a bandwidth from 730 MHz to over 20 GHz with good radiation characteristics.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"46 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":"125117616","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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