Hybrid method for input impedance computation of thin dipoles near arbitrary cylinders

✍ Scribed by Alvaro Catarineu; Alejandro Valero; Juan V. Balbastre; Miguel Ferrando; Luis Nuno

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 146 KB
• Volume: 15
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19970620)15:3<176::aid-mop16>3.0.co;2-5

✦ Synopsis

Figure 3 Reconstructed relative dielectric permittivity for different values of the original permittivity. Comparison among the exact Ž . Ž . solution, the BA and the RA d s 1.6 . Noisy input data SrN s 20 dB Žwith a Gaussian noise with zero mean value and a signal-to-Ž .

. noise ratio SrN corresponding to 20 dB ; see Figure . In this case, the reconstruction is unstable and strongly dependent on parameters. Nevertheless, the RA works better than the BA for a range of permittivity values of at least 1.7 F r F 2.8. Finally, for SrN F 10 dB, no significant advantages of the RA over the BA have been observed.

4. Conclusions

The use of the RA is proposed for 3D imaging purposes. As applied to a numerical solution for the inverse-scattering problem in the space domain, it is proved to involve the same computation of the first-order BA, and it has been shown that, at least in simple cases, the range of applicability in Ž terms of the contrast is larger almost double, in the noisy . case for the RA than for the BA.