B-spline basis functions for moment-method analysis of axisymmetric reflector antennas

✍ Scribed by Fernando L. Teixeira; José R. Bergmann

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 135 KB
• Volume: 14
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19970220)14:3<188::aid-mop16>3.0.co;2-4

✦ Synopsis

ence between the measured intensity of the total field and the calculated one for an estimated object function, by the conjugate gradient method. Computer simulations are performed for some two-dimensional objects with and without a priori information about the outer boundary of the object.

From the simulated results it can be concluded that our technique is very effective in reconstructing a strongly scattering object to which the first-order Born approximation cannot be applied. In addition, the number of iterations required can be remarkably reduced by using a priori information of the outer boundary of the objects. Furthermore, our method gives reasonably accurate results even for noisy data with SNR s 30 dB, but is less sensitive to noise contamination than our previous reconstruction algorithm for determining the refractive index from measurements of the full data of the pattern function.

Research on the discretization errors between synthetic data and real measurements of the total field remains a topic for further study.