A simple method to reduce truncation error in planar near-field/far-field transformers

Author

McFadden, Michael ; Scott, Waymond R., Jr.

Author_Institution

Georgia Inst. of Technol., Atlanta, GA, USA

fYear

2010

fDate

11-17 July 2010

Firstpage

1

Lastpage

4

Abstract

A planar near-field/far-field transformer (NFFFT) is used to compute the radiated field of an antenna under test from near-field planar measurements. The first step in taking an NFFFT is to calculate the plane-wave spectrum (PWS) by Fourier transforming the measurements. The integration used in this step is almost always done numerically with a windowed fast-Fourier transform (WFFT). Certain assumptions implicit in the WFFT introduce errors into the PWS. A simple method to reduce some of these errors is the subject of this paper.

Keywords

Fourier transforms; antenna radiation patterns; antenna testing; error analysis; planar antennas; transformers; Fourier transform; PWS; WFFT; antenna radiated field; near-field planar measurements; planar NFFFT; planar far-field transformer; planar near-field transformer; plane wave spectrum; truncation error reduction; windowed fast-Fourier transform; Antenna measurements; Dipole antennas; Finite wordlength effects; Gain; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2010 IEEE

Conference_Location

Toronto, ON

ISSN

1522-3965

Print_ISBN

978-1-4244-4967-5

Type

conf

DOI

10.1109/APS.2010.5562161

Filename

5562161