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Technology Trade-offs in Mid-Band Array Elements

Explore the design considerations for mid-band antenna arrays ranging from 400MHz to 1.4GHz, balancing performance metrics such as survey speed, dynamic range, and sensitivity. Delve into topics like array geometry, mutual coupling, polarimetry, and LNA selection to optimize cost, power usage, and reliability. Stay updated on EMRACE antenna development and upcoming reviews.

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Technology Trade-offs in Mid-Band Array Elements

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  1. Technology Trade –offs: Mid band Array and Elements Prof. A. K. Brown1 1School of Electrical and Electronic Engineering The University of Manchester, PO Box 88, Manchester, M13 9PL, U.K.

  2. AA-mid • 400MHz-1.4GHz • Wide angle , high sensitivity, multiple beam forming: ~100’s square degrees • High survey speeds • High dynamic range capability • Polarimetry

  3. Element size/type Array Geometry Antenna Array (Array Geometry ,element type) Mutual Coupling Element Impendence , variation with frequency and scan Balanced/unbalanced feed Low Noise Amplifier Coupled noise (relates to geometry and LNA S11 LNA) Beamformer design Frequency sensitive weights “Calibratability”

  4. Bandwidth Minimise Cost /Power Sensitivity scan angle Dynamic Range Sidelobe level Stability/calibration (scan angle and sensitivity) Sidelobe level Minimise N Infrastructure cost Data transport Through life costs: MTBF/MTCF/MTTR etc Polarimetry Calibration accuracy Frequency/angular effect

  5. EMBRACE Antenna development Mechanics evolved toward trustworthy and producible antenna element.

  6. Printed Vivaldi

  7. 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

  8. Polarimetry- frequency/scan angle dependance • LNA selection- noise, balance/unbalanced, power requirements etc • Cost reduction/production engineering/environmental analysis • Tie down the reliability analysis, LRU policy etc

  9. Come a long way during SKADS • Downselected to two basic types, one at a more advanced stage of technological readiness, the other offering possibly further cost reductions and different detailed electro-magnetics • Choice and design of LNA critical – eg shielding requirements, physical size etc • 1st quarter next year technology review • EMRACE development plus background research programme will prove a crucial tool

  10. Thank you!

  11. COBRA DANE Mid1970’s

  12. Dual Polarization Vivaldi Good radiation Anomaly

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