Study on the modal theory applied to small antennas

为了改善应用于手机、平板电脑等移动终端的小型天线的特性，我们研究了基于特征模式和多导体传输线模式理论（模态理论）的天线设计。模态理论可用于分析由多个导体组成的小型天线，有助于设计具有宽带或多频段特性的小型天线。因此，我们研究了一种由两导体组成的倒l天线，并利用模态理论设计了宽带/双频倒l天线。使用模态理论的小型天线的设计过程可以被清除。最后，我们在国际会议上展示了结果。

In order to improve characteristics of small antennas applied to mobile terminals such as mobile phone and tablet PC, we have studied antenna designs with the characteristic modes and the multi-conductor transmission line mode theory (the modal theory). The modal theory can be applied to analyze small antennas consisting of several conducors, and the theory contributes to design small antennas with wideband or multiband characteristics. As results, we investigated an inverted-L antenna (ILA) consisting of two conductors, and designed wideband/dual-band ILA with the modal theory. Design process for small antennas using the modal theory can be cleared. Finally we have presented the results in international conferences.