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A symmetric configuration for planar helix slow-wave structure (SWS) with straight-edge connections (PH-SEC) is proposed in this paper. This structure is compared with a previously proposed PH-SEC SWS on a thick substrate. The results at Ka-band are presented to show that the new structure has higher and more uniform coupling impedance and thus is more suitable for TWT applications.
Design of an unconnected pair of planar helices with straight edge connections is reported. The feed provides equal magnitude and phase signals to the planar helices to excite the required symmetric mode. S-parameters for the entire structure and phase velocity are presented. Compared to a single planar helix, this structure provides a larger beam tunnel.
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