International Journal of Antennas and Propagation / 2008 / Article / Tab 5 / Research Article
Anticipated Impact of Hand-Hold Position on the Electromagnetic Interaction of Different Antenna Types/Positions and a Human in Cellular Communications Table 5 Computational results of the
antenna input impedance,
in dB, radiation
efficiency,
, and total efficiency,
, for different handset setups at 1800 MHz.
Parameter Frequency/1800 MHz
(Ohm)
(dB)
(%)
(%)Handset model A1 A2 A1 A2 A1 A2 A1 A2 No
head In free space 38.7 + j9.92 38.7 + j9.92 −15.5 −15.5 89.8 89.8 87.3 87.3 In hand1 38.5 + j9.07 56.2 + j0.82 −15.6 −24.6 52.2 62.1 50.8 61.9 In hand2 98.7 + j26.4 41.7 + j5.52 −8.7 −19.3 27.8 42.4 24.8 41.9 HR-EFH Cheek Hand1 43.9 + j17.9 61.7 + j18.1 −14.1 −14.4 17.5 30.1 16.8 29.0 Hand2 106 + j47.2 45.6 + j16.3 −7.0 −15.2 9.6 20.0 7.6 19.4 Tilt Hand1 43.7 + j22.5 64.1 + j22.0 −12.3 −13.0 20.1 30.1 18.9 28.6 Hand2 106 + j50.3 44.5 + j18.2 −6.8 −14.1 11.1 19.1 8.8 18.3 Handset model B1 B2 B1 B2 B1 B2 B1 B2 No
head In free space 33.3 – j9.97 38.9 – j8.72 −12.7 −16.0 90.0 86.4 85.1 84.2 In hand1 36.7 – j6.13 58.7
+ j23.3 −15.5 −13.0 54.0 41.2 52.4 39.1 In hand2 49.2
+ j36.5 42.9
+ j6.88 −9.2 −19.5 31.1 37.2 27.4 36.7
HR-EFH Cheek Hand1 37.9
+ j7.64 61.1
+ j25.5 −15.8 −12.3 22.9 22.9 22.3 21.5 Hand2 48.6
+ j52.0 52.8
+ j6.65 −6.6 −23.1 15.6 13.9 12.2 13.8 Tilt Hand1 32.9 – j1.25 59.3
+ j24.9 −13.6 −12.5 24.4 26.5 23.3 25.0 Hand2 42.0
+ j41.4 40.3
+ j9.6 −7.6 −16.5 17.7 22.3 14.6 21. 8