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Radiation from a Circular Waveguide Flush‐mounted to a Ground Plane covered by a Plasma or a Dielectric Slab
Author(s) -
Samaddar S. N.
Publication year - 1970
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19704800106
Subject(s) - admittance , aperture (computer memory) , ground plane , optics , physics , waveguide , slab , radiation , plasma , dielectric , plane (geometry) , excited state , computational physics , acoustics , geometry , electrical impedance , atomic physics , optoelectronics , mathematics , telecommunications , quantum mechanics , geophysics , computer science , antenna (radio)
A theory of the radiation from the open end of a circular waveguide fed in the dominant TE 11 mode and flush‐mounted to an infinite, perfectly conducting flat ground plane covered by a plasma or a dielectric sheath is developed. In this analysis, the contributions to the aperture admittance and the excited fields from the higher order TE 1 n ( n ≥ 1) and TM 1 l ( l ≥ 1) modes are included. The aperture admittance for which the higher order modes are considered, has been calculated by two methods: 1. variational technique and 2. successive iteration method. It is shown that for any desired order of accuracy the results of these approaches are identical. Expressions for radiated fields, surface waves for all radial values of r , and the fields which represent glancing incident fields inside the slab are derived. The contribution of the surface waves to the aperture admittance is also presented.