研究目的
Investigating the design, analysis, and manufacturing of oversized circular metallic corrugated waveguides with rectangular and square grooves for transmitting power from gyrotron to tokamak or dummy load at 42 GHz, focusing on achieving lower transmission loss with HE11 mode.
研究成果
The square groove corrugated waveguide demonstrated lower insertion loss compared to the rectangular groove waveguide, making it more suitable for high-power transmission at millimeter wavelengths. The study also highlighted the importance of precise fabrication to achieve optimal performance.
研究不足
The study was limited by the fabrication precision achievable with the available CNC machine facility, which affected the conversion efficiency of the mode converter. Additionally, the simulation time for a 1-meter waveguide was impractical, leading to the simulation of only a 500 mm segment.
1：Experimental Design and Method Selection:
The study involved designing and simulating oversized circular corrugated waveguides with rectangular and square grooves in CST microwave studio software to analyze their performance in terms of corrugation groove depth and width.
2：Sample Selection and Data Sources:
Two types of corrugated waveguides were fabricated and tested: one with rectangular grooves and another with square grooves, each 500 mm in length.
3：List of Experimental Equipment and Materials:
CST microwave studio software for simulation, ZVA50 vector network analyzer for testing, and CNC machine for fabrication.
4：Experimental Procedures and Operational Workflow:
The waveguides were excited using a TM11 to HE11 mode converter, and their performance was evaluated based on insertion loss and return loss measurements.
5：Data Analysis Methods:
The insertion and return losses were analyzed to compare the performance of square and rectangular groove corrugated waveguides.
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