Cylindrical Near-Field Measurements
نویسندگان
چکیده
A full characterization of the far-field noise obtained from cylindrical nearto far-field transformation, for a white Gaussian, space stationary, near-field noise is derived. A possible source for such noise is the receiver additive noise. The noise characterization is done by obtaining the autocorrelation of the far-field noise, which is shown to be easily computed during the transformation process. Even for this simple case, the far-field noise has complex behavior dependent of the measurement probe. Once the statistical properties of the far-field noise are determined, it is possible to compute upper and lower bounds for the radiation pattern for a given probability. These bounds define a strip within the radiation pattern is found with the desired probability. This may be used as part of a complete near-field error analysis uf a particular cylindrical near-field facility.
منابع مشابه
An approximate expression to estimate signal-to-noise ratio improvement in cylindrical near-field me - Antennas and Propagation, IEEE Transactions on
A very simple approximate expression for the process gain (PG) for the cylindrical case is derived. The different approximations and assumptions required to obtain this expression are shown. This expression might be useful for most practical cylindrical near-field measurements, providing a very simple mean to assess the near-field dynamic range requirements to obtain a desired far-field signal-...
متن کاملEvaluation of 2D concentrically braced frames with cylindrical dampers subjected to near-field earthquake ground motions
Near field earthquakes have imposed major damage to buildings in the past years. In some cases, the intensity of such damage is too considerable to be disregarded. The most effective way to improve seismic performance of buildings is applying a seismic control technique. The cylindrical friction damper is one of these methods, which has become popular for its desirable performance in the energy...
متن کاملTerahertz scattering by subwavelength cylindrical arrays.
We demonstrate the use of a full-wave electromagnetic field simulator to verify terahertz (THz) transmission-mode spectroscopic measurements of periodic arrays containing subwavelength cylindrical scatterers. Many existing THz scattering studies utilize analytical solutions, which were developed for a single scatterer. For multiple scatterers, a scaling factor equal to the number of scatterers ...
متن کاملCylindrical/Spherical Near-Field Antenna Measurement System
A low-cost, fully operational cylindrical and spherical near-field antenna measurement system designed, built, and programmed by a University of Rhode Island Capstone team is presented. The goal of this project was to modify an existing planar near-field system and apply new processing techniques to extract the far-field patterns of an antenna under test (AUT) of any physical shape. The aim of ...
متن کاملExperimental Results Validating the Near-Field to Far-Field Transforma- tion Technique with Helicoidal Scan
This paper concerns the experimental validation of the near-field – far-field transformation technique with helicoidal scanning. Such a technique, based on the theoretical results concerning the nonredundant sampling representations of the electromagnetic fields, makes use of a two-dimensional optimal sampling interpolation formula to reconstruct the near-field data needed to perform the classi...
متن کامل