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Analyzing antenna effects on mobile chassis currents using theory of characteristic modes
Author(s) -
Ghalib Asim,
Sharawi Mohammad S.
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31257
Subject(s) - chassis , monopole antenna , acoustics , dipole antenna , ground plane , antenna measurement , radiation pattern , antenna (radio) , antenna efficiency , antenna factor , physics , electrical engineering , engineering , structural engineering
In this article, the use of the mobile chassis for frequencies greater than 2 GHz is investigated. The analysis is conducted on 120 × 60 mm 2 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.