Effect of material parameters on the resonant frequencies of a dielectric object

Woojin Lee, Tapan K. Sarkar, Hongsik Moon, Alejandro Garcia Lamperez, Magdalena Salazar-Palma

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this letter, the resonant frequencies associated with dielectric bodies is investigated in the frequency domain. The Cauchy method is applied directly in the frequency domain to extract the singularity expansion method (SEM) poles of dielectric spheres having different parameters such as permittivity and conductivity, in contrast to the latter method where it is carried out in the time domain. Simulation examples are analyzed to illustrate the potential of this methodology. It is seen that the value of the dielectric constant has little effect on the resonant frequency of a dielectric sphere. This is rather surprising and is in contrast to the resonant frequencies of a conducting sphere, which vary appropriately with the size of the structure.

Original languageEnglish (US)
Article number6626668
Pages (from-to)1311-1314
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 2013


  • Cauchy method
  • matrix pencil (MP) method
  • natural poles of dielectric bodies
  • resonance
  • scattered electromagnetic field
  • singularity expansion method (SEM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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