发布求助
文献互助 智能选刊 最新文献

Advances in Radio Science最新文献

筛选
英文 中文
Design of leaky-wave antennas with transverse slots for end-fire radiation with optimized radiation efficiency 优化辐射效率的火焰端辐射横槽漏波天线设计
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-71-2019
T. Vaupel, Claudius Löcker
{"title":"Design of leaky-wave antennas with transverse slots for end-fire radiation with optimized radiation efficiency","authors":"T. Vaupel, Claudius Löcker","doi":"10.5194/ars-17-71-2019","DOIUrl":"https://doi.org/10.5194/ars-17-71-2019","url":null,"abstract":"Abstract. A substrate integrated waveguide (SIW) with transverse\u0000slots on the top plane can be used to design an effective leaky-wave antenna\u0000with good frequency beam-scanning and platform integration capability. For a\u0000main beam near end-fire, the phase constant of the radiating wave must be\u0000near to the free space wavenumber or slightly larger. In this context, the\u0000modified Hansen-Woodyard condition gives an optimum phase constant to\u0000maximize the directivity at end-fire. For the analysis of the wave\u0000propagation we have implemented a modal analysis for rectangular waveguides\u0000with transverse slots. Near end-fire, three types of modal solutions exists,\u0000a leaky improper mode, a surface wave mode and a proper waveguide mode. The\u0000leaky mode can reach phase constants larger than the free space wavenumber\u0000to fulfill the Hansen-Woodyard condition, but loses strongly its physical\u0000significance in this slow wave region, thus the excitation of the leaky-wave\u0000becomes negligible there, whereas the proper waveguide mode is dominant but\u0000exhibits only a negligible radiation loss leading to a strong drop of the\u0000antenna efficiency. Therefore, the optimum efficiency of 86 % for\u0000maximizing the gain as proposed in the literature cannot be reached with\u0000this kind of leaky wave antenna. But it will be shown in this contribution by analyzing antenna structures\u0000with finite aperture lengths, that the efficiency can reach nearly 100 %\u0000if the phase constant of the leaky-wave meets exactly the free space\u0000wavenumber (ordinary end-fire condition) and the aperture length is adjusted\u0000with regard to the attenuation constant of the leaky-wave from the modal\u0000analysis. For a given aperture length, a procedure is outlined to adjust the\u0000attenuation constant in several steps at the desired ordinary end-fire\u0000frequency to reach maximum gain and efficiency.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44272536","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
Target simulation for UHF RFID DoA estimation systems 超高频RFID DoA估计系统的目标仿真
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-109-2019
P. Eschlwech, E. Biebl
{"title":"Target simulation for UHF RFID DoA estimation systems","authors":"P. Eschlwech, E. Biebl","doi":"10.5194/ars-17-109-2019","DOIUrl":"https://doi.org/10.5194/ars-17-109-2019","url":null,"abstract":"Abstract. In this work a new method for the evaluation of UHF RFID Direction of Arrival (DoA) estimation systems is developed and demonstrated.\u0000Instead of simulating the system performance or manually measuring it in realistic or ideal environments, a method for the evaluation of DoA systems using received signals produced by a target simulator is proposed.\u0000The simulator generates the signals for each channel of the DoA estimator by attenuating and phase shifting the signals of an UHF RFID chip to replicate the signal propagation conditions for a chosen tag distance and arrival angle.\u0000This combines the advantages of the simulative approach and real world evaluation: it is fast, reproducible and doesn't require special measurement environments. To facilitate this method, plane and spherical wave signal models for the simulation of RFID targets are derived, multichannel phase-shifting and attenuation hardware for the simulation of such signals is presented and a demonstrative evaluation of a RFID DoA estimation system is performed, replicating evaluation scenarios in non reflective and multipath environments.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48224109","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
Near-field measurement of continuously modulated fields employing the time-harmonic near- to far-field transformation 采用时间谐波近场到远场变换的连续调制场的近场测量
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-83-2019
F. Faul, J. Kornprobst, T. Fritzel, H. Steiner, Rudiger Straus, Alexander Weis, R. Geise, T. Eibert
{"title":"Near-field measurement of continuously modulated fields employing the time-harmonic near- to far-field transformation","authors":"F. Faul, J. Kornprobst, T. Fritzel, H. Steiner, Rudiger Straus, Alexander Weis, R. Geise, T. Eibert","doi":"10.5194/ars-17-83-2019","DOIUrl":"https://doi.org/10.5194/ars-17-83-2019","url":null,"abstract":"Abstract. Near-field far-field transformations (NFFFTs) are commonly\u0000performed for time-harmonic fields. Considering arbitrary in-situ measurement\u0000scenarios with given transmission signals, time-varying aspects of modulated\u0000signals have to be taken into consideration. We investigate and characterize\u0000two methods for the measurement of modulated fields, which work with a\u0000time-domain representation of the radiated fields and, at the same time,\u0000allow to employ the standard time-harmonic NFFFT. One method is based on the\u0000fact that the modulation signal can be assumed to be constant in a short\u0000enough measurement interval under the condition that the modulation and\u0000carrier frequencies are several decades apart. The second method performs\u0000long-time measurements in order to obtain the complete frequency spectrum in\u0000every single measurement. Both methods are verified by the NFFFT of synthetic\u0000field data.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44343974","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
Inkjet printing of metal nanoparticles for green UHF RFID tags 用于绿色超高频RFID标签的金属纳米粒子的喷墨打印
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-119-2019
Bruna Cruz, Andreas Albrecht, P. Eschlwech, E. Biebl
{"title":"Inkjet printing of metal nanoparticles for green UHF RFID tags","authors":"Bruna Cruz, Andreas Albrecht, P. Eschlwech, E. Biebl","doi":"10.5194/ars-17-119-2019","DOIUrl":"https://doi.org/10.5194/ars-17-119-2019","url":null,"abstract":"Abstract. UHF RFID tags are nowadays widely and successfully\u0000implemented in many distinct applications, but unfortunately the traditional\u0000production process and incorrect disposal of such devices have a negative\u0000impact on the environment. In this work silver and gold nanoparticle inks\u0000were printed by a consumer inkjet printer on eco-friendly substrates like\u0000paper and PET in order to make the manufacturing process less harmful to the\u0000ecosystem. A dipole antenna with matching loop was designed for the RFID\u0000chip EM4325 from EM Microelectronics, which has an integrated temperature\u0000sensor, at the frequency of 866 MHz. Based on this design, simulations of\u0000the greener tags are presented and compared as a proof of concept, without\u0000optimizing the designs at first for the different materials. The printings\u0000with silver (unlike the gold) were conductive with self-sintering. IPL\u0000sintering was conducted to reduce the sheet resistance from the silver ink\u0000and to turn the gold ink conductive. First S11 parameter and read distance\u0000measurements are shown as well as the simulations with the optimized antenna\u0000designs.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48888197","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: 8
D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE 在andøya的一次火箭战役中，通过VHF和HF雷达进行的D区域观测，专门用于PMWE的调查
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-225-2019
R. Latteck, T. Renkwitz, B. Strelnikov
{"title":"D region observations by VHF and HF radars during a rocket campaign at Andøya dedicated to investigations of PMWE","authors":"R. Latteck, T. Renkwitz, B. Strelnikov","doi":"10.5194/ars-17-225-2019","DOIUrl":"https://doi.org/10.5194/ars-17-225-2019","url":null,"abstract":"Abstract. In April 2018 the PMWE1 sounding rocket campaign was conducted at the Andøya Space Center involving coordinated measurements with rockets and ground instruments to measure parameters relevant for testing of the existing theories of polar mesospheric winter echo (PMWE) formation. The Middle Atmosphere Alomar Radar System (MAARSY) was operated to detect PMWE with multiple beam directions to detect favorable launch conditions. A dedicated experiment configuration with five different beam positions was used to point the radar beam along the planned trajectory of the payload. This special radar experiment allowed to obtain basic information about the spatial structure of the PMWE and its dynamical behavior around the flight of the two rockets. PMWE with signal strengths between 10−17 and 10−15 m−1 have been observed by MAARSY during the whole campaign period, starting with a moderate occurrence at the beginning which decreased towards the end of the campaign. Furthermore real common-volume observations by rocket instruments and radar soundings have been carried out at PMWE altitudes on up-leg and down-leg of the rocket flights. The Saura MF radar was operated during both flights probing the mesosphere with a multiple beam scan experiment to derive horizontal winds and electron density profiles. The obtained PMWE characteristics as signal strength and spectral width of the received radar signals as well as estimated horizontal winds and electron densities are presented with particular emphasis to the launch times of the sounding rockets.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43181980","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
A machine learning joint lidar and radar classification system in urban automotive scenarios 城市汽车场景下的机器学习联合激光雷达和雷达分类系统
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-129-2019
R. Pérez, F. Schubert, R. Rasshofer, E. Biebl
{"title":"A machine learning joint lidar and radar classification system in urban automotive scenarios","authors":"R. Pérez, F. Schubert, R. Rasshofer, E. Biebl","doi":"10.5194/ars-17-129-2019","DOIUrl":"https://doi.org/10.5194/ars-17-129-2019","url":null,"abstract":"Abstract. This work presents an approach to classify road users as pedestrians, cyclists or cars using a lidar sensor and a radar sensor. The lidar is used to detect moving road users in the surroundings of the car. A 2-dimensional range-Doppler window, a so called region of interest, of the radar power spectrum centered at the object's position is cut out and fed into a convolutional neural network to be classified. With this approach it is possible to classify multiple moving objects within a single radar measurement frame. The convolutional neural network is trained using data gathered with a test vehicle in real urban scenarios. An overall classification accuracy as high as 0.91 is achieved with this approach. The accuracy can be improved to 0.94 after applying a discrete Bayes filter on top of the classifier.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48479513","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: 15
Analysis of an Iterative Approach to Determine the Current on the Straight Infinite Wire Above Ground 确定地上无限直导线电流的迭代方法分析
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-169-2019
Felix Middelstaedt, S. Tkachenko, R. Vick
{"title":"Analysis of an Iterative Approach to Determine the Current on the Straight Infinite Wire Above Ground","authors":"Felix Middelstaedt, S. Tkachenko, R. Vick","doi":"10.5194/ars-17-169-2019","DOIUrl":"https://doi.org/10.5194/ars-17-169-2019","url":null,"abstract":"Abstract. An iterative approach which was recently applied to approximate the reflection\u0000and scattering coefficients of transmission line ports is analyzed. The\u0000iterative solution for the current on an infinite wire above ground is\u0000compared to the exact solution. The example is chosen since it is one of the\u0000few problems where an exact solution exists. The wire is excited by a lumped\u0000voltage source or a plane wave. The convergence of the iterative approach is\u0000shown. It can be concluded that the zeroth iteration, which is the classical\u0000transmission line solution, coincides with the general transverse\u0000electromagnetic mode. Furthermore, it is shown that the first iteration is a\u0000very good approximation of the radiation and leaky modes, that occur in the\u0000close neighborhood around the lumped source.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43067893","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
High-Frequency Modeling of Coplanar Waveguides Including Surface Roughness 包括表面粗糙度在内的共面波导高频建模
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-51-2019
G. Gold, K. Lomakin, K. Helmreich, U. Arz
{"title":"High-Frequency Modeling of Coplanar Waveguides Including Surface Roughness","authors":"G. Gold, K. Lomakin, K. Helmreich, U. Arz","doi":"10.5194/ars-17-51-2019","DOIUrl":"https://doi.org/10.5194/ars-17-51-2019","url":null,"abstract":"Abstract. An existing analytical transmission line model to describe propagation\u0000properties of coplanar waveguides including dispersion and radiation effects\u0000was extended to take into account surface roughness of conductor traces. The\u0000influence of parasitics is successively included in the simulation and\u0000compared to measurements. The device under test (DUT) was fabricated on an\u0000Al2O3 wafer. A metal and ceramic chuck was utilized during\u0000measurements up to 120 GHz. The extended model is then capable of precisely\u0000predicting propagation properties in a wide frequency range and can now be\u0000used for calibration purposes like the development of uncertainty budgets.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47448081","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: 11
Towards a Spectral Method of Moments using Computer Aided Design 基于计算机辅助设计的矩谱法研究
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-59-2019
S. Kurz, S. Schöps, Felix Wolf
{"title":"Towards a Spectral Method of Moments using Computer Aided Design","authors":"S. Kurz, S. Schöps, Felix Wolf","doi":"10.5194/ars-17-59-2019","DOIUrl":"https://doi.org/10.5194/ars-17-59-2019","url":null,"abstract":"Abstract. We present first numerical examples of how the framework of\u0000isogeometric boundary element methods, in the context of\u0000electromagnetism also known as method of moments, can be used\u0000to achieve higher accuracies by elevation of the degree of\u0000basis functions. Our numerical examples demonstrate the\u0000computation of the electric field in the exterior domain.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48062661","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
Results from the national intercomparison for rise time and bandwidth measurements within the German Calibration Service (Deutscher Kalibrierdienst – DKD) 德国校准服务(Deutscher Kalibrierdienst - DKD)内上升时间和带宽测量的全国比对结果
IF 0.4
Advances in Radio Science Pub Date : 2019-09-19 DOI: 10.5194/ars-17-45-2019
K. Baaske, T. Kleine-Ostmann, T. Schrader
{"title":"Results from the national intercomparison for rise time and bandwidth measurements within the German Calibration Service (Deutscher Kalibrierdienst – DKD)","authors":"K. Baaske, T. Kleine-Ostmann, T. Schrader","doi":"10.5194/ars-17-45-2019","DOIUrl":"https://doi.org/10.5194/ars-17-45-2019","url":null,"abstract":"Abstract. An intercomparison in the framework of the German Calibration Service (Deutscher\u0000Kalibrierdienst – DKD) was carried out. Two different travelling standards\u0000were used to measure the 10 % to 90 % rise time of a pulse generator and\u0000the 10 % to 90 % rise time, −3 dB bandwidth and attenuation at 500 MHz\u0000of an oscilloscope. Fourteen participants performed the measurements from\u0000September 2015 until May 2016.\u0000","PeriodicalId":45093,"journal":{"name":"Advances in Radio Science","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2019-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46074818","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信