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Electromagnetic-Wave Propagation in the Shielded Ring Line

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2 Author(s)

A theoretical analysis is presented of a periodic structure consisting of equally spaced perfectly conducting rings. The dispersion relation satisfied by the Werent modes of the shielded ring line is determined. This analysis shows that cylindrically symmetric modes identical with those of smooth guides and hybrid modes can travel in this periodical structure. The asymptotic values of the dispersion relation show the different properties of these hybrid modes. The EHn1 modes can be slow, fast, or can travel at light velocity according to the frequency. The EHnq (q > 1) modes are fast modes and exchange their cutoff frequencies for particular values of the geometrical parameters of the structure. These theoretical predictions are verified experimentally by recording the dispersion characteristics of the first modes. For deflecting radio-frequency structures, the fundamental EH11 mode is interesting. This deflection constant is measured on a π / 2 wave structure.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:22 ,  Issue: 2 )

Date of Publication:

Feb 1974

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