Título: Microstrip Antennas - Approximate physical models
Descripción automática: In this video, the presenter from the technical university introduces the concept of microstrip antennas. The focus is on the complexity of analyzing microstrip antennas due to their dielectric inhomogeneity and their various geometries, feeds, and substrate configurations. Analysis methods are categorized into two primary groups: physical models and numerical models. Physical models, including the transmission-line model and the cavity model, are described as simple and provide good insight into the radiation mechanisms, but they lack accuracy and are limited to simple geometries. In contrast, numerical methods like the method of moments, finite difference methods, and finite element methods offer versatility and precision, at the cost of higher computational intensity and less physical insight. Commercial software packages serve as tools for the analysis and design of microstrip antennas.
The presenter explains that these methods can be used in tandem, with physical models in the preliminary design stage and numerical methods for optimizing the final solution. The discussion then moves on to specificities of microstrip antenna design, such as the fringing effect, which requires adjustments to the physical length, and the empirical formula for calculating it. The input admittance and resonance condition are presented, with examples provided for substrate properties, resonance, and impedance matching.
The latter part of the video addresses the behavior of microwave cavities, focusing on field distribution, equivalent currents, and the distinction between radiating and non-radiating slots. The concepts of radiation patterns and associated parameters are then explored, using the cavity model as a reference. The video concludes with a summary of the typical characteristics of a patch providing a broadside radiation pattern, the impact of substrate permittivity on directivity, and comparison of different models with experimental results, highlighting the consistent behavior among the methods despite some variations.
Autor/a: Peixeiro Custódio
Curso: Este vídeo es el 29/62 del curso European School of Antennas. [ Ссылка ]
+ Universitat Politècnica de València UPV: [ Ссылка ]
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