Cross-coupling between open-ended coaxial radiators

T. S. Bird*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A solution is given for the problem of cross-coupling between a pair of open-ended coaxial cables, excited in the TEM mode and terminating in a ground plane. New integral and series representations are derived for the mutual admittance of the TEM modes, and useful low-frequency and far-field approximations are found. Computed results are given for several examples of cables radiating into lossless dielectric media. Measured data is given for a pair of cables radiating in air and computed results agree very well over a wide frequency range. These results show the coupling coefficient increasing initially with frequency, in contrast to waveguide radiators where the coupling coefficient mainly decreases with frequency; the levels attained are significant, particularly above the cut-off of the TE 11 mode. Cross-coupling is shown to be greatest when the inner-to-outer conductor ratio is about 0.53. The solution should be useful for analysing arrays of coaxial horns and obtaining the permittivity and permeability of materials.

Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalIEE Proceedings: Microwaves, Antennas and Propagation
Issue number4
Publication statusPublished - 1996
Externally publishedYes


  • Coaxial cable radiation
  • Open-ended lines
  • Waveguide radiators


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