Pub Date : 2016-04-10DOI: 10.1109/EUCAP.2016.7481927
M. Thurai, P. Kennedy, V. Bringi, B. Notaroš, S. Rutledge
Propagation effects relating to rainfall remote sensing at X-band are examined using data from an event which occurred during a six-month rain measurement campaign in Greeley, Colorado. The campaign involved three disdrometers, a rain gauge, and polarimetric radar measurements at S and X bands. Attenuation correction schemes using well-established procedures are applied to the radar data. Use of the specific attenuation derived from the correction procedures for estimating rainfall rates is examined.
{"title":"Propagation effects at X-band from the 2015 rain measurement campaign in Greeley, Colorado","authors":"M. Thurai, P. Kennedy, V. Bringi, B. Notaroš, S. Rutledge","doi":"10.1109/EUCAP.2016.7481927","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481927","url":null,"abstract":"Propagation effects relating to rainfall remote sensing at X-band are examined using data from an event which occurred during a six-month rain measurement campaign in Greeley, Colorado. The campaign involved three disdrometers, a rain gauge, and polarimetric radar measurements at S and X bands. Attenuation correction schemes using well-established procedures are applied to the radar data. Use of the specific attenuation derived from the correction procedures for estimating rainfall rates is examined.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"8 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85684661","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481745
D. Ludick, M. Venter, D. Davidson, G. Venter
This work considers a combined structural-electromagnetic analysis of large dish reflector antennas typically used in radio astronomy. The effect of gravitational deformation on the radio telescope is quantified by a structural analysis conducted with a finite element solver. The deformed geometry is then analysed using a computational electromagnetic package from which the performance degradation can be assessed. This offers key insights into the operation of the radio telescope under the influence of external forces, such as gravity.
{"title":"A multiphysics analysis of dish reflector antennas for radio astronomy applications","authors":"D. Ludick, M. Venter, D. Davidson, G. Venter","doi":"10.1109/EUCAP.2016.7481745","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481745","url":null,"abstract":"This work considers a combined structural-electromagnetic analysis of large dish reflector antennas typically used in radio astronomy. The effect of gravitational deformation on the radio telescope is quantified by a structural analysis conducted with a finite element solver. The deformed geometry is then analysed using a computational electromagnetic package from which the performance degradation can be assessed. This offers key insights into the operation of the radio telescope under the influence of external forces, such as gravity.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"20 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85887974","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481280
F. Vico, M. Ferrando-Bataller, Tomas Bernabeu Jimenez, D. Sánchez-Escuderos
In this paper we present a new formulation for the scattering of lossless homogeneous dielectrics that is stable in low frequency and has no high density mesh breakdown. The formulation is based on the standard Müller surface integral equation where the unknowns are both electric and magnetic currents on the boundary of the dielectric. We introduce two additional decoupled scalar problems that correspond to the electric and magnetic charges. By doing that we find a second kind integral equation that has unique solution and is stable in low frequency and under mesh refinement. We implement the discretization using a high order locally corrected Nyström method.
{"title":"A decoupled charge-current formulation for the scattering of homogeneous lossless dielectrics","authors":"F. Vico, M. Ferrando-Bataller, Tomas Bernabeu Jimenez, D. Sánchez-Escuderos","doi":"10.1109/EUCAP.2016.7481280","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481280","url":null,"abstract":"In this paper we present a new formulation for the scattering of lossless homogeneous dielectrics that is stable in low frequency and has no high density mesh breakdown. The formulation is based on the standard Müller surface integral equation where the unknowns are both electric and magnetic currents on the boundary of the dielectric. We introduce two additional decoupled scalar problems that correspond to the electric and magnetic charges. By doing that we find a second kind integral equation that has unique solution and is stable in low frequency and under mesh refinement. We implement the discretization using a high order locally corrected Nyström method.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"92 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85933607","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481645
Tamás Pető, S. Bilicz, L. Szűcs, S. Gyimóthy, J. Pávó
The radar cross section of small-sized unmanned aerial vehicles can be extremely low, making the perception of such objects impossible by standard radar techniques. However, the typical propeller size of these vehicles gives rise to a resonant behavior at some commonly used radar frequency bands. Around the resonant frequency, the radar cross section of the propeller highly depends on the incident wave polarization. Consequently, the rotation of the propeller causes a significant periodic fluctuation of the radar echo, moreover, the propeller length can also be estimated. This phenomenon is studied by means of anechoic chamber measurements and numerical simulations.
{"title":"The Radar Cross Section of small propellers on Unmanned Aerial Vehicles","authors":"Tamás Pető, S. Bilicz, L. Szűcs, S. Gyimóthy, J. Pávó","doi":"10.1109/EUCAP.2016.7481645","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481645","url":null,"abstract":"The radar cross section of small-sized unmanned aerial vehicles can be extremely low, making the perception of such objects impossible by standard radar techniques. However, the typical propeller size of these vehicles gives rise to a resonant behavior at some commonly used radar frequency bands. Around the resonant frequency, the radar cross section of the propeller highly depends on the incident wave polarization. Consequently, the rotation of the propeller causes a significant periodic fluctuation of the radar echo, moreover, the propeller length can also be estimated. This phenomenon is studied by means of anechoic chamber measurements and numerical simulations.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"82 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85990355","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481315
R. Hussain, Wajih Abu-Al-Saud, Muhammad Umar Khan, A. Muqaibel, M. Sharawi
In this paper, a 4-element reconfigurable multiple-input-multiple-output (MIMO) antenna is characterized for channel capacity in an indoor environment. The measurements are performed by implementing a 44 MIMO system using software defined radios (SDR). The given antenna operates across several well-known frequency bands between 0.7 GHz to 3 GHz while the channel capacity measurements are performed at 2.45 GHz WLAN band. The performance of the reconfigurable printed antenna is compared with an array of four standard monopoles which are half wavelength apart. The MIMO system using the printed antenna showed a channel capacity of 8 bits/sec/Hz in line-of-sight (LOS) indoor environment and 10 bits/sec/Hz in non-LOS (NLOS) indoor environment.
{"title":"Performance characterization of a reconfigurable MIMO antenna in indoor environment","authors":"R. Hussain, Wajih Abu-Al-Saud, Muhammad Umar Khan, A. Muqaibel, M. Sharawi","doi":"10.1109/EUCAP.2016.7481315","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481315","url":null,"abstract":"In this paper, a 4-element reconfigurable multiple-input-multiple-output (MIMO) antenna is characterized for channel capacity in an indoor environment. The measurements are performed by implementing a 44 MIMO system using software defined radios (SDR). The given antenna operates across several well-known frequency bands between 0.7 GHz to 3 GHz while the channel capacity measurements are performed at 2.45 GHz WLAN band. The performance of the reconfigurable printed antenna is compared with an array of four standard monopoles which are half wavelength apart. The MIMO system using the printed antenna showed a channel capacity of 8 bits/sec/Hz in line-of-sight (LOS) indoor environment and 10 bits/sec/Hz in non-LOS (NLOS) indoor environment.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"36 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76713487","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481654
D. Zheng, Q. Chu
A wideband ±45° dual-polarized base station antenna for 2G/3G/LTE bands is proposed in this paper. By embedding a metallic strip to the traditional loop dipole antenna and adopting T-shaped coupling feeding structure, a wideband impedance bandwidth from 1.7-2.7GHz with SWR≤1.5 was achieved, the isolation of two ports was more than 25dB. A stable 3-dB beamwidths of 65.82°±3.64° at horizontal plane (XOZ Plane) and a stable gain of 7.2dBi±1dBi over the operating bands are achieved simultaneously.
{"title":"The design of dual-polarized antenna for base station applications","authors":"D. Zheng, Q. Chu","doi":"10.1109/EUCAP.2016.7481654","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481654","url":null,"abstract":"A wideband ±45° dual-polarized base station antenna for 2G/3G/LTE bands is proposed in this paper. By embedding a metallic strip to the traditional loop dipole antenna and adopting T-shaped coupling feeding structure, a wideband impedance bandwidth from 1.7-2.7GHz with SWR≤1.5 was achieved, the isolation of two ports was more than 25dB. A stable 3-dB beamwidths of 65.82°±3.64° at horizontal plane (XOZ Plane) and a stable gain of 7.2dBi±1dBi over the operating bands are achieved simultaneously.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"35 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76760409","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481696
A-Min Yao, W. Wu, D. Fang
From the perspective of diversity, spectrum utilization, and the hybrid processing in time domain and in frequency domain, this paper takes a general look and new perspectives on time-modulated antenna array. Some novel ideas, such as the synthesis of 4-D beampattern through 4-D source and the combination of retrodirective technique and the optimization of time-modulated frequency offset, are presented and discussed that may result in the further developments on such array. Finally, the full-wave analysis of the instantaneous and average behaviors on time-modulated antenna arrays is briefly introduced.
{"title":"A general look on time-modulated antenna array","authors":"A-Min Yao, W. Wu, D. Fang","doi":"10.1109/EUCAP.2016.7481696","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481696","url":null,"abstract":"From the perspective of diversity, spectrum utilization, and the hybrid processing in time domain and in frequency domain, this paper takes a general look and new perspectives on time-modulated antenna array. Some novel ideas, such as the synthesis of 4-D beampattern through 4-D source and the combination of retrodirective technique and the optimization of time-modulated frequency offset, are presented and discussed that may result in the further developments on such array. Finally, the full-wave analysis of the instantaneous and average behaviors on time-modulated antenna arrays is briefly introduced.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"32 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77051006","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481185
Richard Roberts, P. Booth, G. Fox, S. Stirland, M. Simeoni
The development of a slimline Q/V-band feed system engineering model (EM) suitable for multi-beam antenna applications and feed spacing of around 26mm is described. This new feed product will extend telecoms satellite capacity by using Q/V-band for gateway links and maximising the Ka-band spectrum for broadband user links. Following an initial feed architecture trade off and breadboard phase for critical feed components, a generic wideband feed architecture was selected for full EM feed development. This comprises a wideband feed horn, wide band polariser, wide band Ortho-mode Transducer (OMT), and a pair of triplexers to accommodate the most challenging filter frequency plan. Predicted and measured performance is presented. The work has been carried out in the frame of an ARTES 5.2 project.
{"title":"Q/V-band feed system development","authors":"Richard Roberts, P. Booth, G. Fox, S. Stirland, M. Simeoni","doi":"10.1109/EUCAP.2016.7481185","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481185","url":null,"abstract":"The development of a slimline Q/V-band feed system engineering model (EM) suitable for multi-beam antenna applications and feed spacing of around 26mm is described. This new feed product will extend telecoms satellite capacity by using Q/V-band for gateway links and maximising the Ka-band spectrum for broadband user links. Following an initial feed architecture trade off and breadboard phase for critical feed components, a generic wideband feed architecture was selected for full EM feed development. This comprises a wideband feed horn, wide band polariser, wide band Ortho-mode Transducer (OMT), and a pair of triplexers to accommodate the most challenging filter frequency plan. Predicted and measured performance is presented. The work has been carried out in the frame of an ARTES 5.2 project.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"356 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77157973","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481689
A. Razavi, A. A. Glazunov, P. Kildal, R. Maaskant
In this paper we look into a near-field measurement setup consisting of a cylindrical reflector and a linear array feed. The main application is Random Line-Of-Sight Over-The- Air measurements in anechoic or semi-anechoic chambers (i.e., anechoic chamber with reflecting floor). More specifically, the aim is testing the wireless communication systems on automotive vehicles. The aim is to generate the uniform field distribution of a plane wave over a pre-defined test zone containing the car or at least the part of the car containing the antenna(s). The field intensity variations over the testing zone have been investigated for reference measurements over the testing frequency bandwidth, i.e., 1.6-2.8 GHz.
{"title":"Array-fed cylindrical reflector antenna for automotive OTA tests in Random Line-Of-Sight","authors":"A. Razavi, A. A. Glazunov, P. Kildal, R. Maaskant","doi":"10.1109/EUCAP.2016.7481689","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481689","url":null,"abstract":"In this paper we look into a near-field measurement setup consisting of a cylindrical reflector and a linear array feed. The main application is Random Line-Of-Sight Over-The- Air measurements in anechoic or semi-anechoic chambers (i.e., anechoic chamber with reflecting floor). More specifically, the aim is testing the wireless communication systems on automotive vehicles. The aim is to generate the uniform field distribution of a plane wave over a pre-defined test zone containing the car or at least the part of the car containing the antenna(s). The field intensity variations over the testing zone have been investigated for reference measurements over the testing frequency bandwidth, i.e., 1.6-2.8 GHz.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"44 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80942265","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 : 2016-04-10DOI: 10.1109/EUCAP.2016.7481290
M. Arias, T. Jost, B. Gonzalez-Valdes, Wei Wang, Siwei Zhang, M. Ulmschneider, C. Gentner
The paper describes a procedure to analyze the statistical variation of the radiation pattern of a monopole antenna mounted on an aircraft using physical optics (PO) in comparison to measurements. In the PO simulations, we use the digital model of a turboprop aircraft to calculate the radiation pattern of the monopole antenna. In order to verify the effect of the aircraft on the antenna radiation pattern, we use different antenna and propeller positions. The results are compared with near field measurements of the real aircraft using a monopole antenna mounted at the same positions as used for the PO simulations. Obtained results shall allow future aeronautical channel simulators to incorporate local propagation effects from the airborne platform on the wireless signal.
{"title":"Statistical analysis of the radiation pattern of an antenna mounted on an aircraft","authors":"M. Arias, T. Jost, B. Gonzalez-Valdes, Wei Wang, Siwei Zhang, M. Ulmschneider, C. Gentner","doi":"10.1109/EUCAP.2016.7481290","DOIUrl":"https://doi.org/10.1109/EUCAP.2016.7481290","url":null,"abstract":"The paper describes a procedure to analyze the statistical variation of the radiation pattern of a monopole antenna mounted on an aircraft using physical optics (PO) in comparison to measurements. In the PO simulations, we use the digital model of a turboprop aircraft to calculate the radiation pattern of the monopole antenna. In order to verify the effect of the aircraft on the antenna radiation pattern, we use different antenna and propeller positions. The results are compared with near field measurements of the real aircraft using a monopole antenna mounted at the same positions as used for the PO simulations. Obtained results shall allow future aeronautical channel simulators to incorporate local propagation effects from the airborne platform on the wireless signal.","PeriodicalId":6509,"journal":{"name":"2016 10th European Conference on Antennas and Propagation (EuCAP)","volume":"5 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80953966","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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