ワイヤレスブロードバンド通信の急速な発展に伴い、超広帯域な特性を有する小形アンテナの要求が高まっている．しかし、「超広帯域」の定義と同様に、超広帯域アンテナの帯域特性の評価は各々異なり、一目で見てアンテナの帯域特性の優劣を判断できないのが現状である。本報告では、超広帯域アンテナのVSWRおよび利得の帯域特性、小形化の評価のための図の表記法について指針を述べている。本報告で述べる図面の表記を用いることにより、超広帯域アンテナの帯域特性を互いに比較することができ、超広帯域アンテナの評価を簡単に行うことが可能となる。%The demand of small antennas with ultra wideband characteristics has risen as wireless broadband communications develops rapidly. However, it is a current state in which the superiority of the wideband characteristics of the antenna or inferiority cannot be easily judged by seeing at one view, because the evaluation of the band characteristics of ultra wideband antennas is different respectively as well as the definition of "Ultra wideband". In this report, the notation of figure for the evaluation of the band characteristics of an ultra wideband antenna and its miniaturization is described. It becomes possible to compare the band characteristics of ultra wideband antennas mutually by using the notation of figure described in this report, and to evaluate ultra wideband antennas easily.
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