Loop antennas. | 21/62 | UPV

Título: Loop antennas.


Descripción automática: In this video, the presenter, whose name is Acivil, discusses small loop antennas, which are a topic in the last part of a book on antenna theory. The presenter defines a small loop antenna as a closed wire loop with dimensions small compared to the wavelength. He emphasizes the importance of the loop's closed design, allowing current cancellation and resulting in less radiation compared to wire antennas explored previously.

He explains that the most suitable coordinate system for describing current distribution in a small loop is cylindrical, as it allows for a uniform current distribution. The presenter then discusses the application of duality theory to this type of antenna, which involves transformations between coordinate systems and leads to defining the radiation vector in cylindrical and then in spherical coordinates.

The video goes into detail about developing expressions for the small loop antenna's radiation vector, including the related mathematical functions like the Bessel function. The presenter simplifies the complex expressions to derive the radiated field for a small loop antenna, noting its similarity to a dipole antenna, with the distinction being the orientation of the radiated field vector.

Acivil concludes by comparing the small loop antenna's electric and magnetic fields to those of an infinitesimal dipole, noting a change in polarization direction due to the application of duality theorems. He describes how to calculate the radiation resistance of the antenna, pointing out that it is much lower than that of a dipole antenna, which results in lower efficiency of the small loop antenna. Lastly, he recommends consulting certain books for a more in-depth discussion on the subject.

Autor/a: Segovia Vargas Daniel

Curso: Este vídeo es el 21/62 del curso European School of Antennas.    • European School of Antennas | Univers...  


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