KEYWORDS: Waveguides, Microwave radiation, Electromagnetism, Temperature distribution, Design, Electric fields, Temperature metrology, Mathematical optimization, Reflection, Free space
Improving the uniformity of electromagnetic field and temperature in the resonant cavity is a hot issue in microwave heating. In this study, a new method for the design of slot waveguides applied to microwave heating is proposed, which is based on Taylor synthesis method and multi-physics calculations. The initial length, width, and offset between the centerline of the slot are designed by Taylor synthesis method, and the spacing between two slots, including the number of slots, is also determined by Taylor synthesis method. Subsequently, by combining electromagnetic fields, temperature fields, and specific characteristics of the heated object, multi-physics calculations are performed, and the above parameters are further optimized to design the slot waveguides. The results show that the slot waveguides designed by the proposed method produces a more uniform temperature and electromagnetic field distribution than the conventional method.
KEYWORDS: Plasma, Waveguides, Microwave radiation, Electric fields, High power radar, 3D modeling, High power microwaves, Microfluidics, Argon, Plasma generation
Aiming at the "front door" protection problem of radar system, a waveguide plasma limiter with short response time, short recovery time and high isolation is presented based on the reflection and absorption characteristics of electromagnetic wave for High-Power Microwave (HPM) environment. A self-consistent three-dimensional (3-D) multi-physics electromagnetic-plasma fluid model coupling full-wave Maxwell’s equations with plasma fluid equations is established and solved by the Spectral-Element Time-Domain (SETD) method to describe the operating mechanism of the waveguide plasma limiter. The Galerkin’s method is employed for the space discretization and the central difference scheme is used for the temporal discretization during the SETD process. Numerical results demonstrate that the gas with low critical breakdown field strength is more suitable for protecting high-power microwaves. Our research can provide theoretical guidance for designers and give the complete physical process of plasma limiter.
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