Premium
Efficient full‐wave analysis of an open‐ended waveguide radiating through a two‐layer superstrate
Author(s) -
Tan Weihua,
Shen Zhongxiang
Publication year - 2009
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2008rs003913
Subject(s) - directivity , optics , waveguide , computation , reflection coefficient , gaussian , physics , reflection (computer programming) , gaussian quadrature , materials science , mathematics , integral equation , computer science , mathematical analysis , telecommunications , antenna (radio) , algorithm , nyström method , quantum mechanics , programming language
This paper presents an efficient full‐wave analysis of an open‐ended waveguide radiating through a two‐layer superstrate. The spectral dyadic Green's function for a multilayer medium is formulated through cascaded matrices, each of which corresponds to one layer of the superstrate independently. The reflection coefficient matrix is derived by enforcing the field matching condition at the opening of the waveguide. The generalized pencil of function (GPOF) method and Gaussian quadrature are adopted to accelerate the computation. Once the excitation and the Green's function are known, the far‐field radiation pattern and directivity are obtained directly from the spectra of the electric and magnetic fields in the half free space. An open‐ended WR‐90 waveguide radiating through a two‐layer superstrate is considered as an example to verify the proposed efficient full‐wave analysis. The effect of the superstrate on the directivity of open‐ended waveguides is also examined and discussed.