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Dispersion characteristics of multi-layer Fabry-Perot Leaky-Wave antennas

In this paper we study the dispersion properties of broadband 2-D multi-layer Fabry Perot Leaky-Wave antennas (LWA). The structure consists of three layers of periodic metallodielectric Partially Reflective Surfaces (PRS) placed over a ground plane forming three air cavities of about half wavelength each. Initially, full wave periodic analysis is employed in commercial simulation software (CST Microwave Studio™) to estimate the directivity performance through measuring the near field and using reciprocity. A dispersion analysis of the leaky modes of the structure is performed by calculating the complex wavenumber within the first cavity. A dipole source is used for excitation of the cavity modes.