Print Email Facebook Twitter Design of a wideband conformal array antenna system with beamforming and null steering, for application in a DVB-T based passive radar Title Design of a wideband conformal array antenna system with beamforming and null steering, for application in a DVB-T based passive radar Author Basavarajappa, V. Contributor Simeoni, M. (mentor) Knott, P. (mentor) Faculty Electrical Engineering, Mathematics and Computer Science Department Telecommunications Date 2012-07-03 Abstract The use of radars in detecting low flying, small targets is being explored for several decades now. However radar with counter-stealth abilities namely the passive, multistatic, low frequency radars are in the focus recently. Passive radar that uses Digital Video Broadcast Terrestrial (DVB-T) signals as illuminator of opportunity is a major contender in this area. A DVB-T based passive radar requires the development of an antenna array that performs satisfactorily over the entire DVB-T band. At Fraunhofer FHR, there is currently a need for an array antenna to be designed for operation over the 450-900 MHz range with wideband beamforming and null steering capabilities. This would add to the ability of the passive radar in detecting covert targets and would improve the performance of the system. The array should require no mechanical adjustments to inter-element spacing to correspond to the DVB-T carrier frequency used for any particular measurement. Such an array would have an increased flexibility of operation in different environment or locations. The design of such an array antenna and the applied techniques for wideband beamforming and null steering are presented in the thesis. The interaction between the inter-element spacing, the grating lobes and the mutual couplings had to be carefully studied and an optimal solution was to be reached at that meets all the specifications of the antenna array for wideband applications. Directional beams, nulls along interference directions, low sidelobe levels, polarization aspects and operation along a wide bandwidth of 450-900 MHz were some of the key considerations. Subject conformal array antennawideband beamformingpassive radarnull steeringpolarizationmutual coupling To reference this document use: http://resolver.tudelft.nl/uuid:9c164c35-6d26-4269-b392-468b24d2c0ce Part of collection Student theses Document type master thesis Rights (c) 2012 Basavarajappa, V. Files PDF Thesis_Vedaprabhu.pdf 4.21 MB Close viewer /islandora/object/uuid:9c164c35-6d26-4269-b392-468b24d2c0ce/datastream/OBJ/view