scholarly journals MATRIX METHOD FOR FAR-FIELD CALCULATION USING IRREGULAR NEAR-FIELD SAMPLES FOR CYLINDRICAL AND SPHERICAL SCANNING SURFACES

2015 ◽  
Vol 63 ◽  
pp. 35-48 ◽  
Author(s):  
Mohamed Farouq ◽  
Mohammed Serhir ◽  
Dominique Picard
Keyword(s):  
Matrix Method ◽  
Near Field ◽  
Far Field ◽  
Field Calculation ◽  
Field Samples

scholarly journals Substituting EMC emission measurement by field and cable scan method using measured transfer function

2013 ◽  
Vol 11 ◽  
pp. 183-188 ◽  
Author(s):  
D. Rinas ◽  
J. Jia ◽  
A. Zeichner ◽  
S. Frei
Keyword(s):  
Transfer Functions ◽  
Near Field ◽  
Good Alternative ◽  
Emission Measurement ◽  
Far Field ◽  
Field Calculation ◽  
Automotive Components ◽  
Anechoic Chambers ◽  
Cispr 25 ◽  
Space Requirements

Abstract. Today EMC emissions of automotive components are often measured in anechoic chambers by an antenna at fixed position according to CISPR 25 (ALSE-method). The antenna voltage often cannot sufficiently describe the behaviour of the measured electronic components and systems. Furthermore space requirements and costs are very high for the ALSE-method. Field- and cable-scan methods combined with near-field to far-field transformation techniques might be a good alternative. Residual reflections from the walls, the metallic floor, the measuring table, interaction of the antenna with the environment, and other factors affect the measurements. Thus, models which only regard the current distribution for near- and far field calculation cannot produce results equal to a chamber measurement. In this paper methods for computing transfer functions for the substitution of EMC antenna measurements with field- and cable scans in a specified calibration area are introduced. To consider influences of the environment, the environment is characterized in a first step and included with transfer functions in the calculation process for the equivalent ALSE-field.

SPACE-TIME MATRIX METHOD FOR MIXED NEAR-FIELD AND FAR-FIELD SOURCES LOCALIZATION

2014 ◽  
Vol 36 ◽  
pp. 131-137 ◽  
Author(s):  
Ruiyan Du ◽  
Fulai Liu ◽  
Jinkuan Wang
Keyword(s):  
Matrix Method ◽  
Near Field ◽  
Space Time ◽  
Far Field

scholarly journals Reconstruction of the Far-Field Pattern of Volumetric AUTs from a Reduced Set of Near-Field Samples Collected along a Planar Spiral with a Uniform Step

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1644
Author(s):  
Francesco D’Agostino ◽  
Flaminio Ferrara ◽  
Claudio Gennarelli ◽  
Rocco Guerriero ◽  
Massimo Migliozzi ◽  
...  
Keyword(s):  
Near Field ◽  
Field Pattern ◽  
Far Field ◽  
Interpolation Algorithm ◽  
Radial Line ◽  
Sample Spacing ◽  
Field Samples ◽  
Field Transformation ◽  
Redundant Representation ◽  
Far Field Pattern

An efficient near-to-far-field transformation (NTFFT) technique, wherein the near-field (NF) measurements are acquired along a planar spiral with a uniform step to make the control of the involved positioners easier, is developed in this article. Such a technique is tailored for quasi-spherical, i.e., volumetric, antennas under test and makes use of a reduced number of NF data. An effective two-dimensional sampling interpolation algorithm, allowing the accurate reconstruction of the input NF data for the standard NTFFT with plane-rectangular scan, is obtained by setting the spiral step equal to the sample spacing required for interpolating along a radial line according to the spatial bandlimitation properties of electromagnetic fields, and by properly developing a non-redundant representation along such a spiral. Tests results are reported to demonstrate that the proposed NTFFT technique retains the same accuracy as the standard plane-rectangular one.

Near-field calculation based on the T-matrix method with discrete sources

2011 ◽  
Vol 112 (14) ◽  
pp. 2384-2394 ◽  
Author(s):  
Carlo Forestiere ◽  
Giovanni Iadarola ◽  
Luca Dal Negro ◽  
Giovanni Miano
Keyword(s):  
Matrix Method ◽  
Near Field ◽  
Field Calculation ◽  
T Matrix
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