TY - JOUR
T1 - Decoupling efficiency of a wideband Vivaldi focal plane array feeding a reflector antenna
AU - Ivashina, Marianna V.
AU - Ng, Mou-Kehn
AU - Kildal, Per Simon
AU - Maaskant, Rob
PY - 2009/4/28
Y1 - 2009/4/28
N2 - 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.
AB - 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.
KW - Antenna array feed
KW - Aperture efficiency
KW - Decoupling efficiency
KW - Mutual coupling
KW - Radiation efficiency
KW - Tapered slot antenna array
UR - http://www.scopus.com/inward/record.url?scp=65249138151&partnerID=8YFLogxK
U2 - 10.1109/TAP.2008.2011184
DO - 10.1109/TAP.2008.2011184
M3 - Article
AN - SCOPUS:65249138151
VL - 57
SP - 373
EP - 382
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 2
ER -