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Antennas & Feeds Mechanical Design

Antennas & Feeds Mechanical Design. Feed Cone Feed Mounting Horn Fabrication. Feed Cone. Why? More Frequencies RFI Containment Reduced clutter at antenna vertex How? Similar to existing K/Q segments Monolithic. Feed Circle. EVLA Feed Cone.

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Antennas & Feeds Mechanical Design

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  1. Antennas & FeedsMechanical Design Feed Cone Feed Mounting Horn Fabrication Antennas & Feeds PDR 2/12/02

  2. Feed Cone • Why? • More Frequencies • RFI Containment • Reduced clutter at antenna vertex • How? • Similar to existing K/Q segments • Monolithic Antennas & Feeds PDR 2/12/02

  3. Feed Circle Antennas & Feeds PDR 2/12/02

  4. EVLA Feed Cone The L-Band horn is not contained in the feed cone. Antennas & Feeds PDR 2/12/02

  5. Feed Cone Antennas & Feeds PDR 2/12/02

  6. Feed Cone • Unresolved Questions • Aluminum or Polycarbonate core? • Aluminum cores are stiffer • Polycarbonate cores are better thermally • Service Access • Receiver heights vary greatly • Space will be at a premium Antennas & Feeds PDR 2/12/02

  7. Feed Mounting • Features: • Based on VLA X-Band • Continuous metal-to-metal for RFI containment • Simple horn installation and alignment • Convenient receiver swapping • Which Bands? • S? C X Ku K? Ka? Q? Antennas & Feeds PDR 2/12/02

  8. Antennas & Feeds PDR 2/12/02

  9. Feed Mounting Antennas & Feeds PDR 2/12/02

  10. Feed Mounting Antennas & Feeds PDR 2/12/02

  11. Feed Mounting Antennas & Feeds PDR 2/12/02

  12. Horn Fabrication • Laminated Horns (L, S and C) • Similar to VLBA L-Band horns • Reduce weight and simplify construction • Tooling Antennas & Feeds PDR 2/12/02

  13. Laminated Horns Antennas & Feeds PDR 2/12/02

  14. Laminated Horns Antennas & Feeds PDR 2/12/02

  15. Ring Loaded Horns • A Proposal for Ring Loaded Horns • Simplify assembly • Simplify receiver mounting • Improve flange mate-up reliability • Reduce manufacturing cost Antennas & Feeds PDR 2/12/02

  16. Ring Loaded Horns Antennas & Feeds PDR 2/12/02

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