Abstract
A performance analysis of a diversity antenna comprising a whip antenna and a planar inverted-F-antenna (PIFA) for portable telephones has been made. Wire-grid analyses yielded radiation efficiency and correlation characteristic results regarding whip lengths, body shapes, inclinations of the body from the vertical, and PIFA positions under various incident wave propagation environments. The results indicated that the maximum radiation efficiency of 0 dB was obtained when the whip antenna length equaled 0.54 of wavelength and that a high radiation efficiency was also provided even for a short whip antenna when the body was a quarter wavelength. Furthermore, the results suggested that small correlation coefficients (less than 0.3) were expected under actual use conditions of portable telephones in which the body inclination exceeded 50 degrees. Further studies demonstrated that a short whip antenna top-loaded with a small cylinder or a helical yielded good diversity performance for small portable telephones. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 1, 80(8): 39–49, 1997
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