Generation of Free Space Radiation Patterns From Non-Anechoic Measurements Using Chebyshev Polynomials

• Published in: IEEE transactions on antennas and propagation Vol. 58; no. 8; pp. 2785 - 2790
• Main Authors: Zhou Du, Jung Ick Moon, Soon-soo Oh, Jinhwan Koh, Sarkar, T K
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurement; Antenna measurements; Antenna radiation patterns; Antennas; Approximation; causality; Chebyshev approximation; Chebyshev polynomial; Contamination; Data mining; Extraterrestrial measurements; FFT method; matrix pencil method; pattern reconstruction; Performance enhancement; Performance evaluation; Pollution measurement; Polynomials; Reflection; Reflector antennas; Searching; Space radiation
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2010.2051130

Generally, antenna radiation patterns are measured in an anechoic condition so that the presence of undesired reflections does not skew the final measurements. The objective of this communication is to search for methodologies which can extract meaningful approximate results from non-anechoic measurements. In other words, how to process the reflection contaminated data and extract valuable information when one does not have a good anechoic room and performs measurements with various undesired reflections present in the data. The Chebyshev polynomials are used to extract from the data collected under non-anechoic environment and generate a radiation pattern for the same antenna radiating in free space conditions. The problem with this method is that some a priori information is required about the environment. Measured data has been used to illustrate the applicability of this new methodology and its improved performance over the FFT based methods.