Pub Date : 2014-04-06DOI: 10.1109/EUCAP.2014.6902319
T. Nguyen, I. Park
The input impedance and radiation characteristics of a stripline dipole antenna on different substrate schemes are presented. Two radiation environments, a semi-infinite galliumarsenide substrate (hereafter called a “semi-infinite substrate”) and a thin gallium-arsenide substrate backed by a silicon lens (hereafter a “lens substrate”), were examined, and the antenna performances were analyzed in a broad frequency range up to 5.0 THz. The semi-infinite substrate approach is useful in the initial investigation of the antenna characteristic itself while saving a significant amount of computational time. The study provides good guidelines for the design of a terahertz photoconductive antenna in that the antenna effect and the lens substrate effect can be individually characterized and optimized for the best possible performance.
{"title":"Comparative study of stripline dipole antenna on semiinfinite and lens substrates at terahertz frequency","authors":"T. Nguyen, I. Park","doi":"10.1109/EUCAP.2014.6902319","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902319","url":null,"abstract":"The input impedance and radiation characteristics of a stripline dipole antenna on different substrate schemes are presented. Two radiation environments, a semi-infinite galliumarsenide substrate (hereafter called a “semi-infinite substrate”) and a thin gallium-arsenide substrate backed by a silicon lens (hereafter a “lens substrate”), were examined, and the antenna performances were analyzed in a broad frequency range up to 5.0 THz. The semi-infinite substrate approach is useful in the initial investigation of the antenna characteristic itself while saving a significant amount of computational time. The study provides good guidelines for the design of a terahertz photoconductive antenna in that the antenna effect and the lens substrate effect can be individually characterized and optimized for the best possible performance.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"24 1","pages":"2470-2474"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73186971","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.2014.6901962
Thomas Lankes, Peter Turban, Frank Mierke
The focus of this paper is the performance evaluation and optimization of LTE MIMO antennas for automotive applications by using field trials in live networks. Being the more challenging frequency range- due to confined space for antenna systems in cars, investigations are carried out in the LTE Band 20 (800 MHz). Key parameters for the evaluation of radio channel quality are presented. Different antenna configurations and designs are qualified in terms of correlation factor (based on complex far-field pattern) and evaluated in test drives with respect to MIMO performance and achievable downlink throughput values. Recommendations for antenna optimization are defined based on the results.
{"title":"Evaluation and optimization of LTE MIMO antenna configurations in automotive environment","authors":"Thomas Lankes, Peter Turban, Frank Mierke","doi":"10.1109/EUCAP.2014.6901962","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6901962","url":null,"abstract":"The focus of this paper is the performance evaluation and optimization of LTE MIMO antennas for automotive applications by using field trials in live networks. Being the more challenging frequency range- due to confined space for antenna systems in cars, investigations are carried out in the LTE Band 20 (800 MHz). Key parameters for the evaluation of radio channel quality are presented. Different antenna configurations and designs are qualified in terms of correlation factor (based on complex far-field pattern) and evaluated in test drives with respect to MIMO performance and achievable downlink throughput values. Recommendations for antenna optimization are defined based on the results.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"57 1","pages":"1100-1104"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73261065","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.2014.6902437
A. Narbudowicz, X. Bao, M. Ammann
The paper reports miniaturization of recently introduced planar omnidirectional circularly polarized antennas. The technique relies on folding the antennas patch underneath itself, decreasing overall footprint. The connectivity between layers is provided by vias, enabling cost efficient PCB manufacturing techniques. The average axial ratio in the xz-plane is less than 3 dB in the band of 2.392 to 2.407 GHz. This is better than previously reported antennas of this type.
{"title":"Miniaturization of omnidirectional circularly polarized antennas","authors":"A. Narbudowicz, X. Bao, M. Ammann","doi":"10.1109/EUCAP.2014.6902437","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902437","url":null,"abstract":"The paper reports miniaturization of recently introduced planar omnidirectional circularly polarized antennas. The technique relies on folding the antennas patch underneath itself, decreasing overall footprint. The connectivity between layers is provided by vias, enabling cost efficient PCB manufacturing techniques. The average axial ratio in the xz-plane is less than 3 dB in the band of 2.392 to 2.407 GHz. This is better than previously reported antennas of this type.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"1 1","pages":"2919-2923"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73349194","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.2014.6902184
Ming-tao Zhang, S. Gao, Chao Gu, Jixiang Wan, Chunbang Wu
This paper presents a novel varactor-load radiating element for reconfigurable reflectarray. The unit-cell for reflectarray consists of patch groups integrated with varactors and the circuitry for DC biasing voltage control. The proposed unit-cell can generate the dual-polarized tunable reflection thanks to the wide reflected phase tuning range, resonant frequencies shift and the symmetry in the structure. The performance has been evaluated by full wave simulations, and the detailed results are demonstrated and discussed.
{"title":"Varactor-loaded dual-polarized unit-cell for reconfigurable reflectarrays","authors":"Ming-tao Zhang, S. Gao, Chao Gu, Jixiang Wan, Chunbang Wu","doi":"10.1109/EUCAP.2014.6902184","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902184","url":null,"abstract":"This paper presents a novel varactor-load radiating element for reconfigurable reflectarray. The unit-cell for reflectarray consists of patch groups integrated with varactors and the circuitry for DC biasing voltage control. The proposed unit-cell can generate the dual-polarized tunable reflection thanks to the wide reflected phase tuning range, resonant frequencies shift and the symmetry in the structure. The performance has been evaluated by full wave simulations, and the detailed results are demonstrated and discussed.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"50 1","pages":"1950-1954"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73865376","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.2014.6902628
P. Kyosti, P. Kemppainen, T. Jamsa
This paper discusses a radio channel measurement scheme to bring site specific propagation characteristics of a live LTE network to a virtual drive testing in a MIMO Over-the-Air (OTA) emulation environment. A directional radio channel measurement performed in a live LTE network in nine different locations is reported and the modelling procedure for MIMO OTA is described. The channel measurement system is composed of a scanner for LTE network, a directive dual polarized antenna, and a channel analysis & modelling software. Measured radio channel parameters are power angular distribution, power delay profile, received polarization power ratio, Ricean K-factor, antenna correlation, and received signal level. The measurement results indicate, for instance, that the angular power distribution is not uniform, but has a range of variation of up to 22 dB, and that the received polarization power ratio is not 0 dB, but vary in between 13 and -8 dB. Line-of-sight component was present in many locations, the average Ricean K-factor was 3.6 dB.
本文讨论了一种无线信道测量方案，将现场LTE网络的特定传播特性引入MIMO over - air (OTA)仿真环境中的虚拟驱动器测试。本文报道了在九个不同地点的实时LTE网络中进行的定向无线电信道测量，并描述了MIMO OTA的建模过程。该信道测量系统由LTE网络扫描器、定向双极化天线和信道分析建模软件组成。测量的无线电信道参数包括功率角分布、功率延迟分布、接收极化功率比、Ricean k因子、天线相关和接收信号电平。测量结果表明，角功率分布不均匀，变化范围可达22 dB;接收极化功率比不是0 dB，而是在13 ~ -8 dB之间变化。在许多地方都存在视距分量，平均雷克系数为3.6 dB。
{"title":"Radio channel measurements in live LTE networks for MIMO Over-the-Air emulation","authors":"P. Kyosti, P. Kemppainen, T. Jamsa","doi":"10.1109/EUCAP.2014.6902628","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902628","url":null,"abstract":"This paper discusses a radio channel measurement scheme to bring site specific propagation characteristics of a live LTE network to a virtual drive testing in a MIMO Over-the-Air (OTA) emulation environment. A directional radio channel measurement performed in a live LTE network in nine different locations is reported and the modelling procedure for MIMO OTA is described. The channel measurement system is composed of a scanner for LTE network, a directive dual polarized antenna, and a channel analysis & modelling software. Measured radio channel parameters are power angular distribution, power delay profile, received polarization power ratio, Ricean K-factor, antenna correlation, and received signal level. The measurement results indicate, for instance, that the angular power distribution is not uniform, but has a range of variation of up to 22 dB, and that the received polarization power ratio is not 0 dB, but vary in between 13 and -8 dB. Line-of-sight component was present in many locations, the average Ricean K-factor was 3.6 dB.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"50 1","pages":"3679-3683"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74785860","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.2014.6902070
Alberto Reyna Maldonado, M. Panduro, Carlos Del-Río Bocio
This paper reports the synthesis of two-dimensional time-domain antenna arrays for steerable energy patterns and minimization of side lobe level. The study is focused into the uniform and non-uniform geometries. The synthesis is based on the well-known sequential quadratic programming. The obtained results show the capabilities of the different antenna arrays to steer the beam in both azimuth and elevation planes with low side lobes.
{"title":"Two-dimensional time-domain antenna arrays for steerable energy pattern with low side lobe level","authors":"Alberto Reyna Maldonado, M. Panduro, Carlos Del-Río Bocio","doi":"10.1109/EUCAP.2014.6902070","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902070","url":null,"abstract":"This paper reports the synthesis of two-dimensional time-domain antenna arrays for steerable energy patterns and minimization of side lobe level. The study is focused into the uniform and non-uniform geometries. The synthesis is based on the well-known sequential quadratic programming. The obtained results show the capabilities of the different antenna arrays to steer the beam in both azimuth and elevation planes with low side lobes.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"23 1","pages":"1513-1517"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78718002","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.2014.6901883
M. Martínez-Inglés, D. Gaillot, J. Pascual-García, Jose-Maria Molina Garcia-Pardo, M. Liénard, J. Rodríguez
This work presents the multidimensional analysis of both deterministic and measurements data in terms of clusters for indoor mmW channels. Firstly, by applying RiMAX, MPC (multipath components) and DMC (dense multipath components) are extracted from both an indoor measurement campaign and ray tracing simulations, including diffuse scatter. Secondly, from the RiMAX estimated paths, K-means with MCD (multipath component distance) is applied to compare the distribution of clusters.
{"title":"On clustering for deterministic and measured indoor mmW channels","authors":"M. Martínez-Inglés, D. Gaillot, J. Pascual-García, Jose-Maria Molina Garcia-Pardo, M. Liénard, J. Rodríguez","doi":"10.1109/EUCAP.2014.6901883","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6901883","url":null,"abstract":"This work presents the multidimensional analysis of both deterministic and measurements data in terms of clusters for indoor mmW channels. Firstly, by applying RiMAX, MPC (multipath components) and DMC (dense multipath components) are extracted from both an indoor measurement campaign and ray tracing simulations, including diffuse scatter. Secondly, from the RiMAX estimated paths, K-means with MCD (multipath component distance) is applied to compare the distribution of clusters.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"1 1","pages":"802-803"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76145862","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.2014.6902093
Catherine Kocia, S. Hum
There is a growing need to develop high-gain low-cost antennas for satellite applications. To potentially meet this need, this paper proposes an optically transparent reflectarray antenna with patch elements fabricated using transparent conductive oxide (TCO). This antenna can be incorporated into the solar panels of a satellite, maximizing the satellite's surface area for both solar power collection and antenna gain. In order to reduce loss, the elements are both single-layer and sub-wavelength. Using these elements, a 10×10 optically transparent reflectarray was designed that produces a beam at 20° off-broadside.
{"title":"Optically transparent reflectarray for satellite applications","authors":"Catherine Kocia, S. Hum","doi":"10.1109/EUCAP.2014.6902093","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902093","url":null,"abstract":"There is a growing need to develop high-gain low-cost antennas for satellite applications. To potentially meet this need, this paper proposes an optically transparent reflectarray antenna with patch elements fabricated using transparent conductive oxide (TCO). This antenna can be incorporated into the solar panels of a satellite, maximizing the satellite's surface area for both solar power collection and antenna gain. In order to reduce loss, the elements are both single-layer and sub-wavelength. Using these elements, a 10×10 optically transparent reflectarray was designed that produces a beam at 20° off-broadside.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"47 1","pages":"1607-1610"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75060468","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.2014.6902366
C. Berry, Ning Wang, M. R. Hashemi, M. Jarrahi
High power sources and high sensitivity detectors are in demand for any terahertz imaging and sensing system. Incorporating plasmonic contact electrodes in photoconductive terahertz sources and detectors has proved to offer higher terahertz radiation powers and detection sensitivities by enhancing the photoconductor quantum efficiency significantly. This is because of the unique capability of plasmonic electrodes in manipulating the concentration of photocarriers near photoconductor contact electrodes, allowing a larger number of photocarriers reach photoconductor contact electrodes within a terahertz oscillation cycle to efficiently contribute to terahertz radiation and detection. The impact of plasmonic electrodes on enhancing the output power and detection sensitivity of photoconductive terahertz sources and detectors is universal and can be employed in various types of photoconductive terahertz antennas, as summarized in this article.
{"title":"Plasmonic photoconductive antennas for high-power terahertz generation and high-sensitivity terahertz detection","authors":"C. Berry, Ning Wang, M. R. Hashemi, M. Jarrahi","doi":"10.1109/EUCAP.2014.6902366","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902366","url":null,"abstract":"High power sources and high sensitivity detectors are in demand for any terahertz imaging and sensing system. Incorporating plasmonic contact electrodes in photoconductive terahertz sources and detectors has proved to offer higher terahertz radiation powers and detection sensitivities by enhancing the photoconductor quantum efficiency significantly. This is because of the unique capability of plasmonic electrodes in manipulating the concentration of photocarriers near photoconductor contact electrodes, allowing a larger number of photocarriers reach photoconductor contact electrodes within a terahertz oscillation cycle to efficiently contribute to terahertz radiation and detection. The impact of plasmonic electrodes on enhancing the output power and detection sensitivity of photoconductive terahertz sources and detectors is universal and can be employed in various types of photoconductive terahertz antennas, as summarized in this article.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"40 1","pages":"2643-2646"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77718131","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.2014.6902116
M. Rousstia, A. Reniers, M. Herben
A non-planar dielectric rod antenna array with operation frequency of 11.2 GHz is proposed, designed, and measured. This antenna array is combined with a RF-MEMS switch to realize the switched-beam performance. Moreover, this antenna array exhibits a uniform performance for different scan angles. The antenna characterization and measurement with the RF-MEMS switch have been done. The measured antenna pattern in the anechoic chamber is in a good agreement with the simulated antenna structure. At 11.2 GHz, the measured antenna has ~17.2 dBi realized gain, 22° beamwidth, and 7.3% bandwidth (i.e 800 MHz). The measured isolation between adjacent antenna elements is -40 dB.
{"title":"An 11-GHz multi-beam dielectric rod antenna using non-planar array approach","authors":"M. Rousstia, A. Reniers, M. Herben","doi":"10.1109/EUCAP.2014.6902116","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902116","url":null,"abstract":"A non-planar dielectric rod antenna array with operation frequency of 11.2 GHz is proposed, designed, and measured. This antenna array is combined with a RF-MEMS switch to realize the switched-beam performance. Moreover, this antenna array exhibits a uniform performance for different scan angles. The antenna characterization and measurement with the RF-MEMS switch have been done. The measured antenna pattern in the anechoic chamber is in a good agreement with the simulated antenna structure. At 11.2 GHz, the measured antenna has ~17.2 dBi realized gain, 22° beamwidth, and 7.3% bandwidth (i.e 800 MHz). The measured isolation between adjacent antenna elements is -40 dB.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"38 1","pages":"1697-1701"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79795206","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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