Decoupling Efficiency of a Wideband Vivaldi Focal Plane Array Feeding a Reflector Antenna

A focal plane array (FPA) feeding a reflector can be used to achieve a large field of view (FOV) with overlapping simultaneous beams. In order to provide a continuous FOV over more than an octave bandwidth, the inter-element spacing in the FPA has to be electrically small over large parts of the ban...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2009-02, Vol.57 (2), p.373-382
Main Authors: Ivashina, M.V., Kehn, M., Kildal, P.-S., Maaskant, R.
Format: Article
Language:English
Subjects:
Antenna array feed
Antenna arrays
Antenna feeds
Antenna measurements
Antenna radiation patterns
Antennas
aperture efficiency
Apertures
Applied sciences
Arrays
Bandwidth
Beams (radiation)
Broadband antennas
Computational efficiency
Computing time
Decoupling
decoupling efficiency
Exact sciences and technology
Focal plane
Mutual coupling
radiation efficiency
Radiocommunications
Reflector antennas
Reflectors
Sensors
Systems, networks and services of telecommunications
tapered slot antenna array
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitting antennas
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Summary:A focal plane array (FPA) feeding a reflector can be used to achieve a large field of view (FOV) with overlapping simultaneous beams. In order to provide a continuous FOV over more than an octave bandwidth, the inter-element spacing in the FPA has to be electrically small over large parts of the band. This will inevitably result in strong mutual coupling effects between the array elements. On transmit, the total lost power due to mutual coupling can be quantified by the decoupling efficiency, a term recently introduced for antenna arrays. This paper presents measured decoupling efficiencies of a Vivaldi element FPA operating between 2.3 and 7 GHz. The radiation patterns of the FPA are calculated for two beam excitations by using measured embedded element patterns, and the corresponding decoupling efficiencies are evaluated by using measured S -parameters between all element ports. The FPA is assumed to illuminate a deep reflector with F / D =0.35 , and the overall reflector aperture efficiencies are computed. The decoupling efficiencies are also determined through the measurements of the total radiation efficiencies in a reverberation chamber, which includes material absorption losses.
ISSN:0018-926X
1558-2221
1558-2221
DOI:10.1109/TAP.2008.2011184