Plane-Wave Spectrum Methods For The Near-Field Characterization Of Very Large Structures Using Uavs: The Ska Radio Telescope Case
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)(2021)
摘要
The reconstruction of embedded element patterns is analyzed in physically and electrically large aperture arrays from near-field measurements taken with a source carried by a drone. This is a very challenging metrology problem, especially when the arrays are composed of wide-band wide field-of-view antenna elements in a highly coupled environment, as is the case for the SKA-low radio telescope stations. We study the use of both a direct near- to far-field transformation and a model-based approach to overcome the limitations imposed by this type of complex electromagnetic structures. Both methods are explained using a decomposition of the antenna voltages in terms of a spectrum of incoming plane waves. A numerical example with an irregular array of 16 log-periodic elements and a hemispherical path shows their abilities to capture the mutual coupling effects.
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关键词
mutual coupling, measurements, plane-wave spectrum, spectral domain
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