AA-mid400MHz-1.4GHzWide angle , high sensitivity, multiple beam forming: ~100s square degreesHigh survey speedsHigh dynamic range capabilityPolarimetry

Antenna Array (Array Geometry ,element type)Element Impendence , variation with frequency and scan Balanced/unbalanced feedCoupled noise (relates to geometry and LNA S11 LNA)

Sensitivityscan angle Dynamic RangeSidelobe levelStability/calibration(scan angle and sensitivity)PolarimetryCalibration accuracyFrequency/angular effect Minimise Cost /PowerSidelobe levelBandwidth

EMBRACE Antenna developmentMechanics evolved toward trustworthy and producible antenna element.

Printed Vivaldi

Planar structure The rings are attached to the surface of the expanded polystyrene foam (EPS) with a defined separation between two layers and the groundplane

Polarimetry- frequency/scan angle dependanceLNA selection- noise, balance/unbalanced, power requirements etcCost reduction/production engineering/environmental analysisTie down the reliability analysis, LRU policy etc

Come a long way during SKADSDownselected to two basic types, one at a more advanced stage of technological readiness, the other offering possibly further cost reductions and different detailed electro-magneticsChoice and design of LNA critical eg shielding requirements, physical size etc1st quarter next year technology review EMRACE development plus background research programme will prove a crucial tool

Thank you!

COBRA DANEMid1970s

Dual Polarization VivaldiGood radiationAnomaly

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