Wide-band Feeds Development G. Sankar Band: 250 – 500 MHz. Band: 250...

download Wide-band Feeds Development G. Sankar Band: 250 – 500 MHz. Band: 250 – 500 MHz. Pranjal’s design: Dipole within a smaller Pranjal’s design: Dipole within

of 24

  • date post

    18-Jan-2018
  • Category

    Documents

  • view

    220
  • download

    0

Embed Size (px)

description

Measurements

Transcript of Wide-band Feeds Development G. Sankar Band: 250 – 500 MHz. Band: 250...

Wide-band Feeds Development G. Sankar Band: 250 500 MHz. Band: 250 500 MHz. Pranjals design: Dipole within a smaller Pranjals design: Dipole within a smaller dia. of Cavity ; design formulated by dia. of Cavity ; design formulated by WiPL-D software. WiPL-D software. Measurements Comparison of Std. Cavity backed Dipole Std. CBD Pranjals Pranjals Cavity dia * 1.07 * 0.76* 0.76* Cavity depth 0.28* 0.45* Std.Cavity Backed Dipole Measurements of CBD Simulated vs. measured Simulated Radiation parameters Simulated cross-polar levels Features Weight : 23.0 kg. Weight : 23.0 kg. ( ) ( ) Cost : ~ Rs / feed. Cost : ~ Rs / feed. Improved BW for 327 MHz. dipole Existing vs. Modified Simulated Radn.parameters Existing / Modified Impedance BW: Impedance BW: 292 469 MHz. 292 469 MHz. (177 MHz.) (177 MHz.) Polariz. BW : Polariz. BW : 275 350 MHz. 275 350 MHz. Impedance BW : Impedance BW : 289 524 MHz. 289 524 MHz. (235 MHz.) (235 MHz.) Polariz. BW: Polariz. BW: 260 375 MHz. 260 375 MHz. Available choices Install 250 MHz.CBD on 2 antennas & test Install 250 MHz.CBD on 2 antennas & test Scale the 250 MHz. CBD design to lower Scale the 250 MHz. CBD design to lower freq. band : 120 240 MHz. freq. band : 120 240 MHz. Modified 327 Dipole install in 10 antennas. Modified 327 Dipole install in 10 antennas. New designs Conical cavity + Dipole : New designs Conical cavity + Dipole : explore. explore. Budget Estimate ( ) 10 nos. of (250 MHz.CBD) : 3.0 lac 10 nos. of (250 MHz.CBD) : 3.0 lac Antenna Range : 8.0 lac Antenna Range : 8.0 lac Hardware & Software : 1.0 lac Hardware & Software : 1.0 lac CST Microwave Studio : 30 lac CST Microwave Studio : 30 lac Total : 42 lac Total : 42 lac Long-term goals LIGHT WEIGHT designs for LIGHT WEIGHT designs for 550 800 MHz. 550 800 MHz. New L-Band feed design with New L-Band feed design with cryogenics. cryogenics. Acknowledgement Hanumanth Rao.B. Hanumanth Rao.B. NCRA Workshop Team NCRA Workshop Team FE Lab. colleagues FE Lab. colleagues on a lighter vein Science is always wrong. It never solves a Science is always wrong. It never solves a problem without creating ten more. problem without creating ten more. : G.Bernard Shaw. : G.Bernard Shaw. X-polar max. Simulated vs. Measured 150 MHz dB - 18 dB 327 MHz dB - 30 dB 610 MHz dB - 28 dB