Assessment of FDTD accuracy in the compact hemielliptic dielectric lens antenna analysis

Abstract

The objective of the paper is to assess the accuracy of a standard FDTD code in the analysis of the near and far-field characteristics of two-dimensional models of small-size dielectric lens antennas made of low or high-index materials and fed by the line sources. We consider extended hemielliptic lenses and use the Muller boundary integral equations method as a suitable reference solution. Inaccuracies of FDTD near so-called half-bowtie resonances are detected. Denser meshing reduces the error of FDTD only to a certain level determined by the type of absorbing boundary conditions used and other fine details of the code. Out of these resonances, FDTD code is demonstrated as capable of providing sufficient accuracy in the near and far-field analysis of small-size hemielliptic lenses typical for the mm-wave applications.

7 pages, 7 figures

References in corpus (2)

• Formation of long-lived, scarlike modes near avoided resonance crossings in optical microcavities
• Small hemielliptic dielectric lens antenna analysis in 2-D: boundary integral equations versus geometrical and physical optics

Cited by in corpus (5)

• Test of the FDTD accuracy in the analysis of the scattering resonances associated with high-Q whispering-gallery modes of a circular cylinder
• Performance of hemielliptic dielectric lens antennas with optimal edge illumination
• Exact off-resonance near fields of small-size extended hemielliptic 2-D lenses illuminated by plane waves
• Accurate analysis of the edge taper influence on the performance of hemielliptic lens antennas
• Optical and modal features of hemielliptic dielectric lenses