An effective NF-FF transformation with a hybrid cylindrical and bipolar scanning

✍ Scribed by F. D'Agostino; F. Ferrara; C. Gennarelli; G. Gennarelli; R. Guerriero

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 418 KB
• Volume: 51
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.24165

✦ Synopsis

Abstract

An efficient and innovative near‐field‐far‐field transformation technique with a hybrid cylindrical and bipolar scanning is proposed in this article. It allows one to considerably reduce the truncation error, which unavoidably affects the cylindrical near‐field‐far‐field transformation. To this end, nonredundant measurements are acquired by employing a cylindrical facility integrated with a rotating arm, which allows to collect the bipolar data on the upper and lower surfaces of the cylinder. Then, by applying the equivalence theorem, the knowledge of the electric field tangential components on the top and bottom of the cylinder is properly exploited to recover the nonredundant cylindrical near‐field data external to the measurement zone. At last, the near‐field data needed to perform the classical near‐field‐far‐field transformation with cylindrical scanning are efficiently computed via an optimal sampling interpolation algorithm. The effectiveness of the approach in reducing the truncation error is assessed by numerical tests. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 772–779, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24165