## Abstract An __n__‐dielectric tube prototype structure consisting of a helix surrounded by adjoining dielectric tubes in an overall envelope was studied by HFSS for flat‐to‐negative dispersion characteristics needed for wideband traveling‐wave tubes. The prototype structure obtained was then “syn
Nonrounded dielectric rectangular rods in helix traveling-wave tubes
✍ Scribed by Claudio Paoloni
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 100 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
Longitudinal dielectric rods in helix traveling-wave tubes (TWTs) contribute to the determination of the performance. A study on nonrounded rectangular rods that exhibit improved dielectric loading with respect to typical rectangular rods is proposed. The expressions for computing the effective dielectric constants for the inhomogeneous dielectric loading model are proposed. Simulated dispersion characteristics are compared with measured data from literature. An analysis method based on rigorous solutions of the field equations is adopted.
📜 SIMILAR VOLUMES
Figure 7 Pulse response of the 1 km fiber link, using a DFB laser diode transmitter and a semiconductor optical amplifier SOA . Ž . Ž . The SOA is placed at the transmitter top and at the receiver bottom . Full time scale range: 6 ns levels of optical power. This is due to the stronger optical satu
Inverted parabolic u s 2 V s 7.980 u s 6r5 V s 0.138 0 0 ¨Ј s y2r3 V s 17.318 ¨Ј s 0 V s 9.066 C C TABLE 8 LP Single-Mode Frequency Range for M-Type Profiles 01 ¨Ј s y1r2 V s 6.464 ¨Ј s 0 V s 4.555
w x 10 simulation results. The excellent agreement between FDTD and analytical or MMP results observed in these two simulations gives confidence that the FDTD method can accurately model curved absorbing objects for near-field simulations. ## IV. CONCLUSIONS The FDTD method has been demonstrated
## Abstract Two‐dimensional (2D) particle‐in‐cell (PIC) simulations, using MAGIC code, have been performed for wide‐band helix traveling‐wave tubes (TWTs) in a large‐signal regime. Fundamental and second‐harmonic power calculated over a 1.5‐octave frequency range of 6–18 GHz were compared and found