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Mtt 08 Poster Holzman 3 14 08
1. Analyzing Broad-Band Electromagnetics Problems with Commercial Software— Time Domain vs. Frequency Domain Eric Holzman 1 , William Nelson 1 , Brian Swift 1 , James Willhite 2 and Shrikrishna Hegde 2 1 Northrop Grumman, Baltimore, MD 21240, USA 2 Sonnet Software, Syracuse, NY 13212, USA
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4. Theory: Time vs. Freq Domain Which requires less CPU time and RAM? (Direct solver only) 1 solution NxN N solutions NxN S-parameters Any , incidence Normal incidence Periodic structures No Yes Transient problems 1 solution 1 pt 1 solution All Frequency response (2 L/ ) 3 (2 L/ ) 3 Number of cells Frequency Time Feature
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6. IBM PC platform for all problems Ring Hybrid 1:4 divider Conical antenna Pillbox antenna Freq-domain analysis of pillbox requires a 64-bit CPU 16 3 3 3 3 3 3 3 RAM (GB) 3.0 3.6 3.6 3.6 3.6 3.6 3.6 3.6 Speed (GHz) 64 32 32 32 32 32 32 32 No. of bits Freq Time Freq Time Freq Time Freq Time CPU features
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8. March’s Ring Hybrid in Stripline ports ports S. March, “A Wideband Stripline Hybrid Ring,” IEEE Trans. Microwave Theory & Tech , p. 361, June 1968. Bandwidth: 7-11 GHz return loss isolation insertion loss FD TD
9. Stripline 1:4 Wilkinson Divider output ports common port Bandwidth: 6-16 GHz Port separation is large isolation Common port return loss insertion loss FD TD
11. Pillbox—a very large antenna E. L. Holzman, “Pillbox Antenna Design for Millimeter-Wave Base Station Applications,” IEEE Ant. & Prop. Mag. , Vol. 45, #1, pp.27-37, Feb. 2003 . Reflector surface Waveguide Port Radiating aperture FD TD TD: 23-32 GHz FD: 28-32 GHz ~40
12. Time Domain—fastest & least RAM Ring Hybrid 1:4 divider Conical antenna Pillbox antenna 86 1001 20 1001 14 1001 11 1001 # of freqs 1 1 1 1 25 25 16 16 # of S-pars 13 h 3.6 h 17 m 0.5 m 86 m 26 m 10 m 0.9 m CPU Time 6.4 0.68 0.59 0.020 1.38 0.192 0.26 0.011 RAM (GB) Freq Time Freq Time Freq Time Freq Time Parameter
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