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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. K E Y W O R D S loop antenna, monopole, PIFA, TCM

In this article, the use of the mobile chassis for frequencies greater than 2 GHz is investigated. The analysis is conducted on 120 × 60 mm2 chassis size with 2 antenna types; monopole and planar inverted‐F antenna (PIFA). The use of the mobile chassis as the main radiating element for frequencies greater than 2 GHz is not practical or realistic. For such frequencies, the antenna is main radiating source that is why in an antenna and chassis scenario a 90% reduction in the ground plane for 2 different antenna types at 2.0 GHz did not affect the response (impedance bandwidth) of the system. At frequencies around 1 GHz, a 44% reduction in the ground plane did not affect the response either but one can observe that at lower frequencies the effect is more severe. The study shows that the antenna type and its localized currents are responsible for radiation. The effect of practical antenna elements on the chassis current modes is investigated. Different antenna types affect the chassis modes differently and the characteristic mode current maxima concentrate around the antenna element. Under such scenarios the excitation of a single mode is very difficult.