Читать книгу Electromagnetic Vortices - Группа авторов - Страница 19

The observation that OAM‐carrying beams exhibit two unique properties compared to conventional beams, namely, the orthogonality and divergence, gives rise to the following question: Can OAM beams’ unique characteristics potentially benefit communication links? We demonstrate that the answer is ‘yes,’ albeit there are still many challenges to overcome before OAM is employed in a practical application. Inspired by this question, we examine possible communication scenarios that involve OAM antennas, review potential applications of OAM beams in communication systems, and discuss technical challenges.

Figure 1.7 Changes of amplitude pattern shape from the reactive near‐field toward the far‐field for (a) a conventional antenna and (b) an OAM antenna. The dimensions are D = 10λ and the pattern is calculated at r = 4.9λ, 24λ, 8000λ corresponding to the reactive near‐field, radiating near‐field and far‐field regions.