Title :
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
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;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2010 IEEE
Conference_Location :
Toronto, ON
Print_ISBN :
978-1-4244-4967-5
DOI :
10.1109/APS.2010.5562161
