A novel hybrid procedure is proposed in this paper for far-field reconstruction from phaseless near-field data. A basi- cally interferometric approach is adopted to retrieve the near-field phase from amplitude-only measurements, which are collected by a simple microstrip circuit used in conjunction with two identical probes moving on the scanning surface. A certain number of sets of complex near-field data is obtained, apart from constant phase- shifts to be computed, one for each set. A nonredundant repre- sentation based on the introduction of the reduced field is then adopted to evaluate these shifts, with an accurate and fast conver- gence to the solution. In order to validate the proposed technique, an X-band prototype using two flanged WR-90 waveguides is suc- cessfully designed and tested on a cylindrical geometry for a stan- dard pyramidal horn.

A novel hybrid approach for far-field characterization from Near-Field amplitude-only measurements on arbitrary scanning surface

MIGLIORE, Marco Donald
2005

Abstract

A novel hybrid procedure is proposed in this paper for far-field reconstruction from phaseless near-field data. A basi- cally interferometric approach is adopted to retrieve the near-field phase from amplitude-only measurements, which are collected by a simple microstrip circuit used in conjunction with two identical probes moving on the scanning surface. A certain number of sets of complex near-field data is obtained, apart from constant phase- shifts to be computed, one for each set. A nonredundant repre- sentation based on the introduction of the reduced field is then adopted to evaluate these shifts, with an accurate and fast conver- gence to the solution. In order to validate the proposed technique, an X-band prototype using two flanged WR-90 waveguides is suc- cessfully designed and tested on a cylindrical geometry for a stan- dard pyramidal horn.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11580/7505
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