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The theoretical evaluation of the input impedance of electromagnetic bandgap (EBG) or leaky wave (LW) antennas is not addressed in the literature. To fill this gap, we present in this letter, an original method to study the input impedance of a line source exciting Fabry-Perot (FP) cavities. The method is based on the generalization of the plane wave expansion of the antenna internal fields to cylindrical...
A directivity of radiation from a line source coupled to 2D electromagnetic crystals is investigated using a Fabry-Perot resonator model for the coupled radiating structure. It is shown that the directivity is characterized by the transmission windows of the electromagnetic crystals in the frequency and angular spectral domains and the transverse resonance condition in the space surrounded by the...
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