Mode excitation and radiation characteristics of antennas in cylindrically stratified media
| Autor: | Ahmed A. Kishk, Dhrubajyoti Bhattacharya, Manikant Sinha, Bratin Ghosh |
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| Rok vydání: | 2020 |
| Předmět: |
Coupling
Physics Acoustics 020208 electrical & electronic engineering Astrophysics::Instrumentation and Methods for Astrophysics 020206 networking & telecommunications Slot antenna 02 engineering and technology law.invention Azimuth law 0202 electrical engineering electronic engineering information engineering Cylinder Dipole antenna Electrical and Electronic Engineering Stationary phase approximation Antenna (radio) Monopole antenna Computer Science::Information Theory |
| Zdroj: | IET Microwaves, Antennas & Propagation. 14:1027-1037 |
| ISSN: | 1751-8733 |
| Popis: | Guided modes excited by a current source in a multilayer cylindrical structure is thoroughly investigated. The guidance condition in the multilayer structure is formulated. Based on this, three antenna configurations in cylindrical stratified media that are of strong practical interest are rigorously investigated: viz. a monopole antenna, a conformal axially-directed slot antenna and an azimuthal slot antenna in a cylindrical layered medium. While previous treatments of such configurations did not investigate the mode-excitation problem of antennas in stratified cylindrical media and were limited in their applicability for a dipole antenna in a cylindrical medium or assumed the slot-current distribution for a slot antenna over a conducting cylinder only, the current investigation provides an in-depth and rigorous insight to the modes excited and power coupled to the excited modes for the antenna configurations and removes such restrictions. In addition to the efficient and rigorous investigation of the coupling problem for the three antenna structures, the radiation characteristics of the antenna configurations are also evaluated using the method of stationary phase, enabling a comprehensive treatment of the antenna structures from both the coupling and radiation aspects. |
| Databáze: | OpenAIRE |
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