Wave propagation on multifilar helices

@article{Johnson1956WavePO,
  title={Wave propagation on multifilar helices},
  author={H. R. Johnson and Thomas E. Everhart and Anthony E. Siegman},
  journal={IRE Transactions on Electron Devices},
  year={1956},
  volume={3},
  pages={18-24}
}
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… 

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