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Fresnel zone to far field algorithm for rapid array antenna measurements

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2 Author(s)
Sierra-Castaner, M. ; Tech. Univ. of Madrid (UPM), Madrid, Spain ; Burgos, S.

This paper presents the implementation of a Fresnel zone to far field transformation algorithm for the measurements of the main patterns (E and H plane) of separable array antennas, from the acquired field values in those main patterns. The method is based on the Fourier Series decomposition of the 1/R2 term of the field propagation in spherical coordinates. This method is valid for Fresnel Zone Measurements, where the 1/R3 term can be neglected. The Antenna Test Facility of the Technical University of Madrid (LEHA-UPM) is using this method for characterizing the BTS antennas for GSM and UMTS cellular systems. These antennas have dual linear polarization (±45°), several antenna ports (depending on the antenna design) and a controlled electrical downtilt, typically from 0° to 14°. Antenna manufacturers and cellular companies are normally interested in the radiation pattern for the main planes, so this method is applied to reduce drastically the acquisition time with accurate results.

Published in:

Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on

Date of Conference:

11-15 April 2011