CST – Computer Simulation Technology

Effective Dielectric Constant Method for a Planar Helix With Straight-Edge Connections
Ciersiang Chua, Sheel Aditya, Zhongxiang Shen
IEEE Electron Device Letters
Volume: 30, Issue: 11, Nov. 2009
1215 - 1217
Dispersion characteristics, effective dielectric constant (EDC) method, planar helix, unidirectionally conducting (UC) screens
A new planar slow-wave structure consisting of a planar helix with straight-edge connections is presented. It is shown that the phase velocity of the proposed structure can be much slower than that for a rectangular helix with identical crosssectional dimensions. Further, the dispersion characteristics are obtained simply by using the effective dielectric constant method; it is shown that the method yields results which, far-fromcutoff, match very well with simulation results obtained from CST Microwave Studio. The proposed structure has the potential of easier fabrication using microfabrication techniques.

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