並列給電中空導波管回路を下層に有する円偏波放射開口アレーアンテナ

摘要

We have developed the double-layer corporate-feed waveguide slot array with more than 32dBi gain and about 80% antenna efficiency over 4.8GHz in the 60GHz-band. In this paper, we propose a circularly polarized aperture array by placing circularly-polarized elements on the above antenna. A hexagonal radiating aperture for the element is designed, and the good axial ratio characteristics are achieved in the boresight. We analyze the full structure of the 16xl6-element array that combines the 2×2-element subarrays and the 64-way divider. The reflection is less than -14dB over 4.9% bandwidth where the axial ratio is less than 2.5dB. High antenna efficiency of 88.7% has been obtained at 61.5GHz by the antenna gain of 33.3dBi including the losses. The 1dB-down gain bandwidth is 6.8%.%著者らは80%のアンテナ効率を利得32dBi以上で周波数4．8GHzにわたって実現した並列給電2層構造導波管スロットアレ一について60GHz帯で検討してきた．本稿ではこのアンテナ上に円偏波素子を装荷した開口アレーを提案した．円偏波素子として断面形状が六角形の開口を設計し，良好な軸比特性を得た．60GHz帯で設計した2×2素子サブアレーと64分配回路を組み合わせて16×16素子アレーを解析した．反射が-14dB以下の帯域は4.9%であり，帯域内の軸比は2．5dB以下である．設計周波数における利得は33．3dBiをアンテナ効率88.7%で実現した．利得の1dB低下帯域は6．8%であった．