Abstract
Microstrip leaky-wave antennas offer the potential for wide-bandwidth, thin-profile apertures, albeit with the potential disadvantage of beam steering with respect to operating frequency. These antennas have been extensively studied in the past; however, previously published results have utilized homogeneous substrates. In this article, a substrate with transverse step inhomogeneous layers is investigated with two methods: the transverse resonance method (TRM) and the finite element-boundary integral (FE-BI) method. In this article, the former is generalized for N-layers and used to determine the leaky-wave mode propagating characteristics. Antennas designed using this approach are then simulated using the finite element method to determine the radiation pattern.
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