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Applications of Antenna Near/far-Field Measurement

Author: OuJie
Tutor: LiYong
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Near-field measurements Test system Phase center Circularly polarized Near-field diagnosis
CLC: TN820
Type: Master's thesis
Year: 2011
Downloads: 197
Quote: 1
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Abstract


The Antenna Measurement is the necessary means and methods of modern high-performance antenna design and verification . Starting from the basic theory of planar and cylindrical near-field measurements to study the practical application of the antenna near-field measurement engineering . In this paper, the mode expansion method and scattering matrix method to derive the near-field plane wave expansion formula and near-field antenna coupling probe under the terms of compensation formula , discussed the principle of selecting the sample surface and the sampling interval , and discretization formulas . Secondly, in cylindrical coordinates , cylindrical wave expansion and probe compensation is derived formulas and sampling of near-field coupling principle . Papers to the near and far field test system as an example , the analysis of the structure of the test system , the hardware components and the development of test software functionality . Moving reference point for the test phase center and circularly polarized antenna , the antenna phase center position coordinates , and the use of elliptic orthogonal decomposition of a circularly polarized antenna axial ratio , gain , and other parameters calculated method. Actual antenna test , in good agreement with the measured data with the theoretical analysis . The final product of the pattern analysis of array antenna near-field diagnostic problem . I.e. in the case of do not know each array element amplitude and phase excitation , only need to know the array antenna and the far field distribution of the unit , can be diagnosed with the amplitude of the individual array element of the array antenna distribution, and thus determine the error element . Array element excitation coefficients obtained error is small, and can reach a very high precision, to meet the needs of the actual diagnostic test within a certain range .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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