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Wide-band Feeds Development G. Sankar

Explore the development of wide-band feeds with a focus on the Sankar Band frequency range of 250-500 MHz. Compare measurements of a standard cavity-backed dipole with Pranjal's design utilizing a smaller diameter cavity. Simulated and measured radiation parameters are evaluated, along with the potential for improved bandwidth at 327 MHz. Available choices for implementation and budget estimates are also discussed. Long-term goals include developing "light-weight" designs for 550-800 MHz and a new L-Band feed design with cryogenics.

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Wide-band Feeds Development G. Sankar

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  1. Wide-band Feeds DevelopmentG. Sankar Band: 250 – 500 MHz. Pranjal’s design: Dipole within a smaller dia. of Cavity ; design formulated by WiPL-D software.

  2. Measurements

  3. Comparison of Std. Cavity backedDipole

  4. Std.Cavity Backed Dipole

  5. Measurements of CBD

  6. Simulated vs. measured

  7. Simulated Radiation parameters

  8. Simulated cross-polar levels

  9. Features • Weight : 23.0 kg. • ( 20.0 + 1.5 + 1.5) • Cost : ~ Rs.26000 / feed.

  10. Improved BW for 327 MHz. dipole

  11. Existing vs. Modified

  12. Simulated Radn.parameters

  13. Impedance BW: 292 – 469 MHz. (177 MHz.) Polariz. BW : 275 – 350 MHz. Impedance BW : 289 – 524 MHz. (235 MHz.) Polariz. BW: 260 – 375 MHz. Existing / Modified

  14. Available choices … • Install 250 MHz.CBD on 2 antennas & test • Scale the 250 MHz. CBD design to lower freq. band : 120 – 240 MHz. • Modified 327 Dipole – install in 10 antennas. • New designs – Conical cavity + Dipole : explore.

  15. Budget Estimate (2010-2011) • 10 nos. of (250 MHz.CBD) : 3.0 lac • Antenna Range : 8.0 lac • Hardware & Software : 1.0 lac • CST Microwave Studio : 30 lac • Total : 42 lac

  16. Long-term goals • ‘LIGHT WEIGHT’ designs for 550 – 800 MHz. • New L-Band feed design with cryogenics.

  17. Acknowledgement • Hanumanth Rao.B. • NCRA Workshop Team • FE – Lab. colleagues

  18. … on a lighter vein … • Science is always wrong. It never solves a problem without creating ten more. : G.Bernard Shaw.

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