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Title
Japanese:垂直並列給電多層平行平板円偏波放射素子の解析と設計 
English:Analysis and design of a circularly-polarized element on a parallel-plate waveguide with perpendicular corporate-feed 
Author
Japanese: 西本広希, 戸村崇, 廣川二郎.  
English: Hiroki Nishimoto, Takashi Tomura, JIRO HIROKAWA.  
Language Japanese 
Journal/Book name
Japanese:信学技報 
English: 
Volume, Number, Page vol. 121    no. 330    pp. 86-91
Published date Jan. 13, 2022 
Publisher
Japanese: 
English: 
Conference name
Japanese:電子情報通信学会，アンテナ・伝搬研究会 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.ieice.org/ken/paper/20220121YChP/
 
Abstract In a conventional corporate-feed waveguide circularly polarized slot array antenna, plural thin metal plates are stacked and diffusion bonded. A problem is that the number of the plates is large due to the metal-wall cavity and the thick degenerated apertures in the radiation part. To solve this problem, we propose the radiation part in which plural thin layers of degenerated apertures are stacked with spaces among them without bonding. We aim to simplify the structure and maintain the characteristics. Conventionally, we designed using a general-purpose software. However, because of a large number of parameters and huge amount of time required for the analysis, we create a fast analysis program using the method of moments specified for the structure, and use a genetic algorithm for broadband design. As a result, 12.9% bandwidth for VSWR less than 1.5 and axial ratio lower than 3 dB are obtained with a small number of thin metal plates. In addition, the analysis time is reduced by 90.3% compared with general-purpose software.

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