Wave propagation on multifilar helices
- 1 January 1956
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IRE Transactions on Electron Devices
- Vol. 3 (1) , 18-24
- https://doi.org/10.1109/t-ed.1956.14094
Abstract
The modes of the sheath helix are shown to be related closely to the space harmonics of real helices. Multiwire helices propagate many modes, the principal space-harmonic component of each approaching more closely the appropriate sheath helix mode as the number of wires is increased. Each mode can be excited by a certain phase sequence of exciting currents for the wires in one transverse plane. Experimental verification of the theory is reported using a bifilar helix tube. Phase velocities and impedances are measured, using Kompfner's null method and the start of backward-wave oscillations for the principal forward and backward components respectively.Keywords
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