Abstract
In this article, the effect of actual antenna elements on rectangular chassis modes is investigated. The study is performed on three different antenna types, that is, printed inverted-F antenna (PIFA), printed monopole, and printed loop antennas. For the first time, we show that the presence of the antenna generates a completely new mode called the “antenna mode” (compared with chassis mode modifications as in other existing works). The new “antenna mode” only depends on the shape or geometry of the antenna and is independent of its location on the chassis (unlike chassis modes). In the presence of the antenna, the current maxima lies on the antenna element for all the modified chassis modes and the newly generated “antenna mode.” In such scenarios, pure excitation of single characteristic mode (CM) is not possible with known existing techniques.
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