Design of a high gain and high efficiency W-band folded waveguide TWT using phase-velocity taper

Srivastava, Anurag; Christie, V.L.

doi:10.1080/09205071.2018.1435309

Cited by 11 publications

(2 citation statements)

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“…11(b), because the phase synchronization condition is almost satisfied for the considered frequency band, i.e., β p ≈ β 0 over the shown band (relative band of 2.2% around 88GHz) in this example. Thus, the gain per period resulting from the amplification mode (solid red) is 20 log(e) × 0.027π ≈ 0.74 dB in this frequency range which is close to the small-signal gain 1 dB reported in [20] that was obtained by simulating the serpentine TWT amplifier at 90 GHz.…”

Section: Application To Serpentine-based Twt Amplifiersupporting

confidence: 81%

“…Serpentine SWSs have recently gained a lot of interest due to the growing importance of millimeter wave and terahertz frequencies in modern applications and also due to the advancement of fabrication technologies such as LIGA (LIthographie, Galvanoformung, Abformung). As an illustrative example, we use the same geometry of serpentine SWS discussed in [19], [20], as shown in 10(a). The serpentine waveguide is made of copper and has rectangular cross-section of dimensions a = 1.9 mm and b = 0.325 mm, bending radius of 0.325 mm (radius at half way between inner and outer radii), straight section length of 0.6 mm, beam tunneling radius of 0.175 mm.…”

Section: Application To Serpentine-based Twt Amplifiermentioning

confidence: 99%

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Traveling Wave Tube Eigenmode Solver for Interacting Hot Slow Wave Structure Based on Particle-In-Cell Simulations

Mealy,

Capolino

2020

Preprint

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An eigenmode solver based on particle-in-cell simulations is proposed to find the hybrid beam-electromagnetic eigenmodes in a "hot" slow-wave structure (SWS), i.e., where the electromagnetic mode interacts with an electron beam. The proposed scheme is based on the determination of the transfer matrix of the unit-cell of the hot SWS that takes into account the interaction of the electromagnetic mode with the electron beam, followed by the determination of its eigenvalues and eigenvectors using Floquet theory. The proposed method is applied to find the hot modes, with complex wavenumber, in a traveling wave tube (TWT) amplifier with helix SWS. We show dispersion relations of the modal complex wavenumber of the electromagnetic wave interacting with the electron beam when varying frequency and beam voltage, with results in agreement with Pierce theory. The method is also applied to find the complex-wavenumber modes of the hot SWS of a millimeter wave TWT amplifier based on a serpentine waveguide. The technique is general and can be applied to any SWS geometry where the electromagnetic modes interact with an electron beam.

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Section: Application To Serpentine-based Twt Amplifiersupporting

confidence: 81%

Section: Application To Serpentine-based Twt Amplifiermentioning

confidence: 99%