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A novel highly accurate synthetic technique for determination of the dispersive characteristics in periodic slow wave circuits

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9 Author(s)
Hezhong Guo ; Lab. for Plasma Res., Maryland Univ., College Park, MD, USA ; Carmel, Y. ; Lou, W.R. ; Leemian Chen
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A highly accurate (0.1-0.5%) synthetic technique for determining the complete dispersive characteristics of electromagnetic modes in a spatially periodic structure is presented. It was successfully applied for the cases of the fundamental (TM0(1)) as well as higher-order (TM0(2), TM0(3)) passband modes in a corrugated waveguide. This structure is commonly used in relativistic backward wave oscillators, traveling wave tubes, extended interaction oscillators, and a variety of multiwave Cerenkov generators. An appropriately shorted periodic structure resonates at specific frequencies. To measure these frequencies accurately and unambiguously, the authors used unique antenna radiators to excite pure modes in the circuit under test. An analytical technique for deriving the complete dispersion relation using the experimentally measured resonances is presented. This technique, which is based on the intrinsic characteristics of spatially periodic structures, is applicable to slow wave structures of arbitrary geometry

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 11 )