本稿ではHaloアンテナを水平偏波素子とする無指向性偏波共用アンテナを提案している.移動体通信基地局の増加を受けて，置局サイトの確保はこれまで以上に困難となっている.迅速かつ低コストにエリア展開するために，基地局アンテナは小形•細径•軽量であることが求められている.従来の無指向性偏波共用アンテナは小形化が困難で，新規に設置が困難であった.本稿では小形な円筒構造のHaloアンテナの円筒内に給電回路，垂直偏波素子を揷入することで，径が0.15λの細径なアンテナを実現する.特に，Haloアンテナの自己平衝作用により，偏波間の高いアイソレーションが得られることを示す.%In this paper, novel o mni-directional polarization diversity antennas are proposed. As the increase of mobile base stations, the space for mobile base station has been limited and cell design has become more difficult. The antennas for mobile base station are required slim and lightweight achieving rapid and low construction cost cell design. Omni-directional polarization diversity antenna is difficult to achieve slim. In this paper, slim omni-directional polarization antenna which uses Halo antenna as a horizontal polarization antenna is proposed. Halo antenna is a small, cylindrical horizontal polarization antenna. Inserting both feed circuits and vertical polarization antenna inside the cylinder of Halo antenna, the proposed configuration achieves slim antenna with the diameter of 0.17λ. Additionally, the self-balancing effects of Halo antenna help to achieve high isolation between each polarization antenna.
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