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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

versão On-line ISSN 2179-1074


RAMOS, Glaucio L.; REGO, Cássio G.  e  FONSECA, Alexandre R.. Characterization of the radiation pattern of antennas using time-domain spherical-multipole and moment expansion. J. Microw. Optoelectron. Electromagn. Appl. [online]. 2013, vol.12, n.2, pp.533-546. ISSN 2179-1074.

This paper presents results of a time-domain spherical-multipole near-to-far-field transformation together with a moment expansion applied to antenna radiation patterns. The equivalence principle is applied to the tangential fields all over the FDTD/WP-PML spatial grid and the use of the spherical-multipole expansion leads to the near-to-far-field transformation, and energy and power norms of temporal signals are used to obtain the antenna radiation patterns for transient and steady-state responses. Such approach is employed to obtain UWB antenna radiated fields and radiation patterns directly in time-domain, it being more convenient to perform an unified characterization in time and frequency domains.

Palavras-chave : Finite-difference time-domain method; time-domain spherical multipole; time-domain moment expansion.

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