High efficiency excitation of dielectric rods using a magnetic ring current

Stephen M. Hanham*, Trevor S. Bird

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We describe a theoretical analysis of the excitation of the fundamental HE11 surface wave mode on an infinite dielectric rod by a magnetic ring current that is interior to the rod. Earlier work has provided results for an external ring source. Results obtained by us show that for an interior source excitation efficiencies close to 100% are possible for high permittivity dielectrics and launching efficiencies greater than 90% can be achieved over bandwidths greater than 20%. This is a higher efficiency than is possible with an exterior source. Simulation results verifying the theoretical analysis are presented for the practical case of a coaxial waveguide exciting the dielectric rod.

Original languageEnglish
Pages (from-to)1805-1808
Number of pages4
JournalIEEE Transactions on Antennas and Propagation
Issue number6
Publication statusPublished - Jun 2008
Externally publishedYes


  • Dielectric rod
  • Excitation efficiency
  • Magnetic ring current


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