Preloaded Parabolic Dish Antennas for SKA. By G. Swarup (NCRA-TIFR) & N. UdayaShankar (RRI). Plan of the Talk. Summary Concept of the Pre-loaded Parabolic Dish Antennas Description and Fabrication details of 12-m PPD Antenna Cost Estimates Strawman's Design For SKA Conclusion. Summary.
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By G. Swarup (NCRA-TIFR) & N. UdayaShankar (RRI)
Patent applications by G. Swarup & S.C. Tapde on 1st Aug, 2000, no. 721/MUM/2000 and on 30 July 2001 no. PCT/In 01/00137.
Important to Note
* Values for 25m dish are tentative, although a preliminary FEM analysis has been done.
* Assuming (a) Antenna aperture efficiency due to illumination of 0.5 at 150 MHz and 0.65 at higher frequencies.
(b) Rms error of the reflecting surface = 2mm
(c) Reflectivity leakage of the wire mesh of size 6mm x 6mm x 0.55 mm size as a function of frequency, based on calculations.
** Assuming galactic background temperature of 50 x (f(MHz)/300)-2.6K, ATA type receiver but with a primary feed of 4 log-periodic antennas and ground leakage for the wire mesh of size 6mm x 6mm x 0.55mm.
… Table 3: … dia
… Table 3: dia