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Surface impedance method for the analysis of phased arrays with a lossy ground plane
Author(s) -
Stalzer Henry J.,
Shmoys Jerry,
Hessel Alexander
Publication year - 1987
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/rs022i003p00323
Subject(s) - lossy compression , optics , reflection coefficient , electrical impedance , waveguide , acoustics , conductor , ground plane , surface (topology) , reflection (computer programming) , materials science , dielectric , dielectric loss , physics , geometry , mathematics , antenna (radio) , computer science , telecommunications , optoelectronics , statistics , quantum mechanics , programming language
An approximate method for the analysis of phased arrays of waveguide apertures in a lossy surface is developed. The procedure uses a surface impedance boundary condition in place of modal expansions in the lossy region. The method is validated in the two‐dimensional case by comparing numerical results with those obtained by using modal expansions both in the feed waveguide and the lossy medium. The accuracy of the method improves as the magnitude of the lossy dielectric constant increases. The location of the blind spot when the lossy region is backed with a conductor is accurately predicted by the surface impedance method. Calculations of scan dependent matched reflection coefficient, element power gain and power loss to the surface are presented. Salient features of the effects of loss are discussed. The results of the paper permit an extrapolation of the surface impedance method to arrays of realistic waveguide phased array elements with lossy ground.