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2020 International Workshop on Antenna Technology (iWAT)最新文献

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An Overview of Digital Beamforming Implemented on SDR Platforms 基于SDR平台的数字波束形成技术综述
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570609928
Cristian Codau, R. Buta, A. Pastrav, T. Palade, P. Dolea, E. Puschita
{"title":"An Overview of Digital Beamforming Implemented on SDR Platforms","authors":"Cristian Codau, R. Buta, A. Pastrav, T. Palade, P. Dolea, E. Puschita","doi":"10.1109/iWAT48004.2020.1570609928","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570609928","url":null,"abstract":"Beamforming is a key element in current wireless communications, being employed by a broad variety of applications due to the important impact on the system performance. This paper presents a survey of the state of the art of digital beamforming with SDRs. Several algorithm implementations, linear and circular antenna array configurations and transmit/receive operations are pointed out, showing the benefits of the beamforming implementations on SDR in terms of interference mitigation and improved SNR.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126209803","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}
引用次数: 1
Power Efficiency and Antenna Array Dimension of Middle Range Wireless Power Transmission 中距离无线电力传输的功率效率和天线阵列尺寸
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570592917
Changyoung An, H. Ryu
{"title":"Power Efficiency and Antenna Array Dimension of Middle Range Wireless Power Transmission","authors":"Changyoung An, H. Ryu","doi":"10.1109/iWAT48004.2020.1570592917","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570592917","url":null,"abstract":"Recently, long and middle range WPT (wireless power transmission) is very hot issue, which uses RF (radio frequency) beamforming technology. To efficiently provide the power at distance, large dimension of array system is basically required in to the far end power receiver. In this paper, we design an antenna and phase conjugate circuit for Retrodirective Array Antenna (RDA) - based Wireless Power Transfer (WPT) system. In this paper, we design a patch array antenna by applying Electromagnetic Band Gap (EBG) structure and compare the structure and performance without EBG. In this paper, a phase conjugate circuit is designed based on a heterodyne structure. Simulations show that beam directivity is improved by 0.2dBi, 0.45dBi and 0.3dBi at 0, 120 and 180 degree. Simulation results show that the phase conjugation is well performed. So, we can find that the proposed system can be useful for the long and middle range WPT system. Also, we have studied and discussed the system power efficiency for wireless power transmission and antenna array dimension. As a design example, we have introduced the primary design of 5% power efficiency for wireless power transmission at the distance of 4 m. when the center frequency is 2.45GHz. The antenna dimension and the size will be determined by the service style and space consideration and specific application area and so on.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116501042","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}
引用次数: 2
Dual-Band Dual-Rectangular-Loop Circular Polarization Metasurface Antenna for GNSS Receivers GNSS接收机双频双矩形环圆极化超表面天线
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570616289
M. Sumi
{"title":"Dual-Band Dual-Rectangular-Loop Circular Polarization Metasurface Antenna for GNSS Receivers","authors":"M. Sumi","doi":"10.1109/iWAT48004.2020.1570616289","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570616289","url":null,"abstract":"The demand for Global Navigation Satellite Systems (GNSSs) has increased. In this paper, a dual-band dual- rectangular-loop circular polarization metasurface antenna for GNSS receivers in the L1 (1575.42 MHz) and L2 (1227.60 MHz) bands is proposed. A loop-type Frequency Selective Surface (FSS) is adopted to lower an antenna height and enhance an antenna gain. The Voltage Standing Wave Ratio (VSWR) bandwidths (<=2) in the L1 and L2 are 4.1% and 11.0%. The Axial Ratio (AR) bandwidths (<=3 dB) in the L1 and L2 bands are 12.9% and 5.2%. The proposed antenna achieves dual-band VSWR and AR frequency characteristics with a single feed and the antenna height of 0.129 wavelengths (L2 band). The antenna is suitable for GNSS receivers due to its dual-band frequency characteristics and low-profile structure.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127099768","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}
引用次数: 1
Calibration for a Hybrid MIMO Near-field Imaging System to Mitigate Antennas Effects 基于天线效应的混合MIMO近场成像系统校正
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570608734
Ha Hoang, Zeeshan Ahmed, M. John, P. McEvoy, M. Ammann
{"title":"Calibration for a Hybrid MIMO Near-field Imaging System to Mitigate Antennas Effects","authors":"Ha Hoang, Zeeshan Ahmed, M. John, P. McEvoy, M. Ammann","doi":"10.1109/iWAT48004.2020.1570608734","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570608734","url":null,"abstract":"A calibration method for a high-resolution hybrid MIMO turntable radar imaging system is presented. A line of small metal balls is used in the calibration process to measure the position shift caused by undesired effects of the antennas. The unwanted effects in the near-field antenna response are analysed and significantly mitigated based on the referential features of the MIMO configuration.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125350089","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}
引用次数: 1
A Modified Physical Optics Approach for Extrapolating Fresnel Region RCS Measurements at High Incidence Angles 高入射角下菲涅耳区RCS测量外推的改进物理光学方法
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570609771
I. Mihai, R. Tamas, A. Sharaiha
{"title":"A Modified Physical Optics Approach for Extrapolating Fresnel Region RCS Measurements at High Incidence Angles","authors":"I. Mihai, R. Tamas, A. Sharaiha","doi":"10.1109/iWAT48004.2020.1570609771","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570609771","url":null,"abstract":"The aim of this paper is to extend the application area of the physical optics for RCS measurements at Fresnel region antenna-to-target distances and incidence angles higher than 20° by taking into account the field diffracted by the target edges. The diffracted field is calculated by using an approach based on equivalent currents with diffraction coefficients resulting from the uniform theory of diffraction. The ratio between the analytical expression of the radar cross section at far-field and Fresnel regions results in an extrapolation factor for the diffracted field. The RCS resulting from the scattering parameters measured at Fresnel region distances is then corrected with that extrapolation factor. The experimental validation of the proposed technique demonstrates reasonable agreement with the simulations.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130796253","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}
引用次数: 0
Performance Evaluation of the UWB-based CDS Indoor Positioning Solution 基于uwb的CDS室内定位方案性能评价
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570609927
E. Puschita, Raluca Simedroni, T. Palade, Cristian Codau, Stefan Vos, Vlad Ratiu, Ovidiu Ratiu
{"title":"Performance Evaluation of the UWB-based CDS Indoor Positioning Solution","authors":"E. Puschita, Raluca Simedroni, T. Palade, Cristian Codau, Stefan Vos, Vlad Ratiu, Ovidiu Ratiu","doi":"10.1109/iWAT48004.2020.1570609927","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570609927","url":null,"abstract":"Ultra-wideband technology has become very popular for accurate indoor positioning due to its resilience to interference with other technologies or resulting from multipath propagation. In this context, the scope of this paper is to evaluate the UWB-based indoor localization kit developed by Control Data Systems for accurate positioning of an operator relative to an industrial equipment. The kit is based on the VN360 UWB Module integrating the Decawave DW1000 IC and consists of 4 UWB anchors with a predetermined relative position and one UWB tag (for the operator). The accuracy of the evaluated solution is performed in terms of positioning error variation relative to the distance between the tag and the system origin.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116981321","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}
引用次数: 6
Low-Profile Wideband High-Gain and Low-RCS Circularly Polarized Array Using Checkerboard Polarization Rotators 采用棋盘偏振旋转器的低轮廓宽带高增益低rcs圆极化阵列
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570613994
Qi Zheng, Chenjiang Guo, Jun Ding, G. Vandenbosch
{"title":"Low-Profile Wideband High-Gain and Low-RCS Circularly Polarized Array Using Checkerboard Polarization Rotators","authors":"Qi Zheng, Chenjiang Guo, Jun Ding, G. Vandenbosch","doi":"10.1109/iWAT48004.2020.1570613994","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570613994","url":null,"abstract":"In this paper, a circularly polarized (CP) array based on checkerboard polarization rotators (PRs) with wideband and low radar cross section (RCS) is presented. The proposed array is formed by $2 times 2$ CP element antennas fed with a sequential feeding network. On the one hand, the CP array has a wide axial ratio (AR) bandwidth of 22.5% (AR $leq$ 3 dB), an impedance bandwidth of 37.3% (S11 $leq$ -10 dB), and a 3-dB gain bandwidth of 18.4% with a maximum of 13 dBic. On the other hand, the checkerboard arrangement of the PRs generates both an in-band and a partial out-band RCS reduction under normal incidence for both x- and y- polarizations.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131276304","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}
引用次数: 0
Channel Prediction of Wideband OFDM Systems in a Millimeter-Wave Band Using Delay-Domain Multipath Detection 基于延迟域多径检测的毫米波宽带OFDM系统信道预测
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570609470
Yuta Takano, Y. Ogawa, T. Nishimura, T. Ohgane, J. Hagiwara
{"title":"Channel Prediction of Wideband OFDM Systems in a Millimeter-Wave Band Using Delay-Domain Multipath Detection","authors":"Yuta Takano, Y. Ogawa, T. Nishimura, T. Ohgane, J. Hagiwara","doi":"10.1109/iWAT48004.2020.1570609470","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570609470","url":null,"abstract":"In multi-user MIMO systems, we can achieve high-capacity downlink transmission without interferences using precoding at a base station. We need, however, accurate channel state information (CSI). In time-varying environments, the CSI may be outdated at the actual transmission time. Frequent pilot symbol transmission decreases the communication efficiency. One of the solutions to this challenging issue is channel prediction, that is, we predict future channels from observed past channels. This paper presents a channel prediction method for wideband OFDM systems. The method detects multipath components in a delay domain using fast iterative shrinkage-thresholding algorithm (FISTA). We evaluate the prediction performance, and compare it with that using IDFT. It has been shown that the proposed method using FISTA is excellent in terms of prediction accuracy in a sparse propagation environment. In an environment where we have densely located multipath components around clusters, the performance degrades and is almost the same as that of the method using IDFT.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134482981","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}
引用次数: 3
Field Decorrelation in a MIMO Antenna using Transformation Electromagnetics 变换电磁法在MIMO天线中的场去相关
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iWAT48004.2020.1570599232
Usman Qureshi, M. U. Khan, T. Hassan, M. Sharawi, S. Burokur, R. Mittra
{"title":"Field Decorrelation in a MIMO Antenna using Transformation Electromagnetics","authors":"Usman Qureshi, M. U. Khan, T. Hassan, M. Sharawi, S. Burokur, R. Mittra","doi":"10.1109/iWAT48004.2020.1570599232","DOIUrl":"https://doi.org/10.1109/iWAT48004.2020.1570599232","url":null,"abstract":"A new technique for field decorrelation in MIMO antennas using transformation electromagnetics (TE) to reduce the envelope correlation coefficient (ECC) is presented in this work. Based on the concept of TE, an all-dielectric device is proposed to tilt the radiation patterns of the MIMO antenna elements in opposite directions in order to achieve field decorrelation. The all-dielectric device is realized by using quasi-conformal transformation electromagnetics (QCTE). The effectiveness of the proposed technique is verified by designing a two element MIMO antenna at 3 GHz. Based on simulations, the proposed technique results in more than 82% reduction in the ECC value which indicates an enhanced MIMO performance.","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133040306","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}
引用次数: 1
[Copyright notice] (版权)
2020 International Workshop on Antenna Technology (iWAT) Pub Date : 2020-02-01 DOI: 10.1109/iwat48004.2020.9083739
{"title":"[Copyright notice]","authors":"","doi":"10.1109/iwat48004.2020.9083739","DOIUrl":"https://doi.org/10.1109/iwat48004.2020.9083739","url":null,"abstract":"","PeriodicalId":230714,"journal":{"name":"2020 International Workshop on Antenna Technology (iWAT)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133845502","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}
引用次数: 0
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