- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - EM wave propagation experiment at e band and d band for 5G wireless systems: preliminary results
摘要： Preliminary results on an electromagnetic wave propagation experiment at E and D band are presented. The research activity is collaboration between Politecnico di Milano and the Huawei European Microwave Centre in Milan, which has recently installed short (325 m) terrestrial links operating at 73, 83, 148 and 156 GHz and connecting two buildings in the university main campus. Received power data are processed to identify and isolate rain events and quantify the fade induced by precipitation, AR. Moreover, AR is estimated taking advantage of ancillary data collected by a laser-based disdrometer collocated with the link transceivers. Preliminary results definitely point out the higher prediction accuracy achieved by exploiting the information on the rain drop size provided by the disdrometer.
关键词： Electromagnetic wave propagation,5G mobile networks,terrestrial links,measurement
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Increased reliability of outdoor millimeter-wave link simulations by leveraging lidar point cloud
摘要： Exploitation of the millimeter-wave (mmWave) band for both the small-cell radio access (RAN) and in-street backhauling must contribute to strongly increase the capacity of next-generation outdoor wireless networks. Beside the numerous technological challenges faced by the equipment manufacturers, the definition of practical deployment requirements and elaboration of efficient network design procedures are key issues for future network providers and the refinement of business models. The work reported in the present paper is part of research activity on small-cell and wireless backhaul design methodologies. The authors analyze how digital geographical data and radio propagation models may be enhanced and tailored to answer new mmWave simulation requirements. Three different propagation methods are compared in an urban 60 GHz scenario: based on free building database, traditional high-resolution map data, or Lidar point cloud. The advantage of the multi-paths prediction versus direct-path is also investigated, using the Lidar point cloud as a simulation input.
关键词： millimeter-wave propagation,Lidar point cloud,simulation
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Ka-band Scintillation on Low-Elevation Satellite-Earth Links in the Arctic; Long-Term Measurements and Improved Modelling
摘要： This paper presents long term scintillation measurements on 20 GHz satellite links at 3 coastal locations in the Norwegian Arctic and compares the results with existing prediction methods. The elevation angles of the three links are 6.6, 10, and 14o respectively. The scintillation levels are highest during the summer months and show large monthly variations at two coastal locations, while the variations are reduced for the island location. The measured scintillation amplitudes are lower than predicted by the ITU-R method. A much modification of the existing methods is proposed, based on the results, giving significantly better annual predictions for the 3 locations in question. Monthly predictions are also improved, if slightly conservative.
关键词： scintillation,satellite communication,radio wave propagation,measurement
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Reliability of Disdrometer-derived W-Band Attenuation Predictions
摘要： applications W-band frequencies are used for radar observations of clouds. In a undergo underneath potential significant attenuation. Also in satellite telecommunications the use of W-band frequencies is planned, to transfer the ever increasing amount of data. Rain attenuation is one of the most significant atmospheric effects influencing propagation, and precise knowledge is important for system design. signals the Often the specific rain attenuation is given as a function of rain rate, but at higher frequencies, such as W-band, the sensitivity to the shape of the drop size distribution (DSD) increases. Incorporating DSD measurements in the prediction process is recommended. In this study the reliability of the on DSD attenuation measurements is confirmed through comparison with radiometric attenuation data, acquired from an Atmospheric Propagation and Profiling System (ATPROP). 90 GHz, 2D-Video-Disdrometer predictions (2DVD), based of at a
关键词： W-band frequencies,electromagentic wave propagation,specific rain attenuation
更新于2025-09-04 15:30:14
-
RADIATION FIELD AND OPTICAL COUPLING EVALUATION USING A NEW MATHEMATICAL MODEL
摘要： The mathematical model elaborated in this paper is based on the concept of intrinsic modes in order to analyze and synthesize optical wave propagation along a non-uniform optical structure which is used in integrated optics communication as tapered optical coupler. The new mathematical model is simply developed by introducing modi?cations to the intrinsic integral, and its numerical evaluation illustrates the electromagnetic ?eld distribution inside a taper thin ?lm and also outside the waveguide constituted by the substrate and the cladding of lower refractive index. The proposed method permits e?ciently tracking the behaviour of the optical waves both inside and outside the optical waveguide, and quantifying the radiation and optical coupling occurring from the taper thin ?lm of higher refractive index to adjacent mediums until a total energy transfer; this happens at thicknesses lower than waveguide cuto? thickness of each mode. The new model can be applied to all types of tapered optical coupler, made from di?erent optical materials and having di?erent wedge angles.
关键词： intrinsic modes,tapered optical coupler,mathematical model,optical wave propagation,electromagnetic ?eld distribution,radiation and optical coupling
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Statistics of Rain Attenuation in Prague, Empirical Data and Numerical Predictions
摘要： Attenuation of electromagnetic waves in microwave bands is determined experimentally via measurement of received signal variations on terrestrial radio links operating in three frequency bands around 58, 94 and 122 GHz. The measured time series of attenuation are processed to obtain long-term cumulative distributions of attenuation due to hydrometeors. The obtained empirical distributions are compared with the ones predicted using the model of the Recommendation ITU-R P.530. For a given time percentages, the predicted attenuation levels exceeded are apparently lower than the levels of empirical distributions. A power-law relationship between attenuation and rain intensity is obtained by a least square approximation of measured simultaneous rain intensity and rain attenuation. The results are discussed and compared with the numerical predictions.
关键词： electromagnetic wave propagation,atmospheric hydrometeors,rain attenuation
更新于2025-09-04 15:30:14