Modeling of wideband slow-wave structures of coupled-cavities-chain type by the impedance design of experiments

Nakrap, I. A.; Savin, A. N.; Sharaevskiĭ, Yu. P.

doi:10.1134/s1064226906030090

Cited by 1 publication

(2 citation statements)

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“…CCC with two sets of bandwidths: cavity and slot wave types, can be used in TWT in various operating modes. When the main cavity and slot passbands of CCC merged, a significant increase in its working passband was obtained in [1][2][3] (up to 70% when the phase velocity changes within ± 3%). The transition to the inverted slot mode slow wave structure (SS) significantly changes the properties of CCC and, accordingly, the functional application in TWT when suppressing excitation at the short-wavelength boundary of the working band [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…A complete study of electrodynamic characteristics (EDC) in the dynamics of the merge and inversion of the SS CCC cavity and slot passbands with their simultaneous expansion and dispersion characteristics (DC) control of both passbands with a wide variation of the main dimensions of the cavities was carried out in [3,9,10]. Optimization of CCC with combined passbands made it possible to obtain characteristics with a smooth change in their DC and a finite value of the coupled impedance in the merged region [3,9]. Nevertheless, the characteristics of the transmission coefficient and distribution of the SS field showed the presence in this region of a non-transmission band of small width (less than 2%) with slight attenuation, as well as the excitation of a local oscillation in it [11].…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of merge and inversion of cavity and slot modes in coupled cavity chain slow wave structure

Nakrap

Savin²

2019

ITM Web Conf.

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The results of a theoretical study of the electrodynamic characteristics (EDC) in the dynamics of merge of the cavity and slot passbands of a slow-wave structure (SS) such as a coupled cavity chain (CCC) with the subsequent transition to a CCC with an inverted slot mode with a change in the opening angle of the coupling slot are presented. An analysis of the characteristics of CCC with combined and inverted bands with a traditional SS is carried out. The coupling impedance is presented for the first three spatial harmonics. The EDC CCC calculation was performed in the ANSYS HFSS program using the method of separation of closely spaced modes proposed by the authors. Suggested method made it possible to significantly increase the accuracy of the calculation of the dispersion characteristics of the CCC in the process of combining the passbands with the determination of the boundaries of not only the cavity, but also the slot passbands until the disappearance of the non-transmission band. The analysis of the distribution of the fields at given phase shifts in the cavity and slot CCC passbands revealed the features of their change during the inversion of the bands compared to traditional concepts. The field distributions in both passbands at different phase shifts have a hybrid (mixed) character of the fields of both the cavity and slot types waves.

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