Realizable design of field taper via coordinate transformation

Jianjia Yi, Sawyer Campbell, Rui Feng, Shah Nawaz Burokur, Douglas Henry Werner

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Complex electromagnetic structures can be designed by exploiting the concept of spatial coordinate transformations. In this paper, we define a coordinate transformation scheme that enables one to taper the electric field between two waveguides of different cross-sections. The electromagnetic field launched from the wide input waveguide is compressed in the proposed field tapering device and guided into the narrow output waveguide. In closed rectangular waveguide configurations, the taper can further play the role of a mode selector due to the output waveguide’s cut-off frequency. Realizable permittivity and permeability values that can be achieved with common existing metamaterials are determined from the transformation equations and simplified by a proposed parameter reduction method. Both a 2D continuous design model and a potential 3D discretized realization model are presented at microwave frequencies and the performances of the tapering devices are verified by full-wave finite element numerical simulations. Finally, near-field distributions are shown to demonstrate the field tapering functionality.

Original languageEnglish (US)
Pages (from-to)505-515
Number of pages11
JournalOptics Express
Volume26
Issue number1
DOIs
StatePublished - Jan 8 2018

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coordinate transformations
tapering
waveguides
selectors
rectangular waveguides
output
microwave frequencies
near fields
permeability
electromagnetic fields
cut-off
permittivity
electromagnetism
electric fields
cross sections
configurations
simulation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Yi, Jianjia ; Campbell, Sawyer ; Feng, Rui ; Burokur, Shah Nawaz ; Werner, Douglas Henry. / Realizable design of field taper via coordinate transformation. In: Optics Express. 2018 ; Vol. 26, No. 1. pp. 505-515.
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Realizable design of field taper via coordinate transformation. / Yi, Jianjia; Campbell, Sawyer; Feng, Rui; Burokur, Shah Nawaz; Werner, Douglas Henry.

In: Optics Express, Vol. 26, No. 1, 08.01.2018, p. 505-515.

Research output: Contribution to journalArticle

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