Dual-mode and three-transmission-zeros bandstop filters with closed-loop ring resonators

✍ Scribed by Man-Long Her; Quei-Min Lin; Kun-Ying Lin; Ying-De Wu; Yi-Lin Wang

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 149 KB
• Volume: 44
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20562

✦ Synopsis

S c , the standard MAS is seen to be superior to the hybrid technique. However, the boundary-condition error for the standard MAS increases dramatically as d decreases, whereas the error of the hybrid technique does not.

With regard to the far-field results and the boundary-condition error, it is seen that the problems for the standard MAS are not present for the hybrid technique, thus demonstrating that the MoM surface currents provide an accurate treatment of the rapidly varying field values near the illuminating source. The configurations presented above are representative examples of a large number of cases that have been investigated and have led to the same conclusion.

4. CONCLUSION

A hybrid technique based on MAS with a localized MoM surfacecurrent region has been derived. The method is applicable to 2D impedance-scattering problems with very closely positioned illuminating sources and shows significant improvement, as compared to the standard MAS with respect to the far fields and boundarycondition error. In this work, a circular cylinder has been investigated; however, the hybrid technique can straightforwardly be extended to other types of scatterers. REFERENCES 1. D.I. Kaklamani and H.T. Anastassiu, Aspects of the method of auxiliary sources in computational electromagnetics, IEEE Antennas Propagat Mag 44 (2002), 48 -64. 2. H.T. Anastassiu, D.I. Kaklamani, D.P. Economou, and O. Breinbjerg, Electromagnetic scattering analysis of coated conductors with edges using the method of auxiliary sources (MAS) in conjunction with the standard impedance boundary condition (SIBC), IEEE Trans Antennas