Abstract
The characteristic modes (CMs) analysis can give physical insights into the intrinsic mechanisms of radiating structures. To obtain the CMs of composite metallic-dielectric objects is a very challenging task. Existing formulations encounter some problems in calculating the CMs of multiple and multi-layer composite structures. In this paper, we present two new surface integral equation (SIE) formulations for the calculation of CMs of composite metallic-dielectric objects. Employing the contact-region modeling (CRM) technique and the inherent dependent relationships between various kinds of equivalent sources, we propose two new SIE-based CM formulations wherein the electric or magnetic currents on the surfaces of dielectric regions are alternatively involved to suppress spurious modes. Compared to the existing formulations, the proposed formulations are easier to be extended to multiple and multi-layer composite structures. Numerical results of five representative structures are presented to validate the accuracy of the proposed formulations.
Highlights
In recent years, the theory of characteristic modes (TCM) becomes popular in the antenna engineering because it provides a systematic approach to obtain the inherently resonant and modal behaviors of electromagnetic objects, without knowing the definite excitation sources
The TCM is initially proposed by Garbacz and Turpin [1], [2] and reformulated by Harrington and Mautz using the electric field integral equation (EFIE) and the method of moments (MoM) for metallic bodies [3], [4]
Following the EFIE-based CM, the TCM was extended to dielectric bodies using the volume integral equation (VIE) [5], named here as the VIE-based CM
Summary
The theory of characteristic modes (TCM) becomes popular in the antenna engineering because it provides a systematic approach to obtain the inherently resonant and modal behaviors of electromagnetic objects, without knowing the definite excitation sources. With the surface equivalence principle, we found that the current elimination only depends on the geometry of the dielectric, which makes the proposed formulations easier to be extended to multiple and multi-layer composite objects, compared with the approaches in [16], [17]. It is the main advantage of the proposed approach over the methods of [16], [17]. The proposed methods are expected to be helpful in analyzing and designing the antennas with metallic-dielectric combinations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
