This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. 2 IEEE ANTENNAS & PROPAGATION MAGAZINE JUNE 2015 1045-9243/15©2015IEEE A n essential characteristic for the accurate simulation of wideband antenna systems is the modeling of their intricate geometrical details, including the feeding ports. In this article, we describe a leap-frog (LF) dis- continuous Galerkin (DG) time-domain (TD) method com- bined with an efficient local time-stepping (LTS) strategy to deal with the high contrast in the element sizes for the elec- tromagnetic modeling of these kinds of structures. The traditional delta-gap source model and a realistic coaxial port model are revisited. Numerical examples are presented and validated with measurements and commercial software simulations to demonstrate the applicability of the proposed approach. METHODS USED FOR MODELING AND THEIR APPLICABILITY Wideband antennas are key compo- nents in many different applications such as short-range and indoor ultra- wideband communication systems, sensors for electronic countermeasure, and high-performance radar military systems. In these kinds of structures, an accurate modeling is critical in zones with small geometrical details, such as feeding ports. Frequency- domain (FD) methods, such as the method of moments and the finite- element method (FEM), are the usual choices for their ability to accurately model fine geometrical details. How- ever, FD methods may become computationally inefficient for ultrawideband analysis since each frequency needs a complete simulation, typically involving a linear system resolution. TD methods are a natural alternative for these purposes. Advances in the TD formulations of FEMs have been made [1], but they still remain unaffordable for elec- trically large problems, such as those also requiring the Digital Object Identifier 10.1109/MAP.2015.2437279 Date of publication: 17 July 2015 Efficient Antenna Modeling by DGTD Jesus Alvarez, Luis Diaz Angulo, Amelia Rubio Bretones, Carlos M. de Jong van Coevorden, and Salvador G. Garcia Leap-frog discontinuous Galerkin time-domain method.