Anticipated Impact of Hand-Hold Position on the Electromagnetic Interaction of Different Antenna Types/Positions and a Human in Cellular Communications

Table 6

Computational results of the antenna input impedance, 𝑍_in,|𝑆₁₁| in dB, radiation efficiency, 𝜂_rad, and total efficiency, 𝜂_tot, for different handset setups at 2025 MHz.

Parameter			Frequency/2025 MHz
			𝑍in (Ohm)		|𝑆11| (dB)		𝜂rad (%)		𝜂tot (%)
Handset model			A1	A2	A1	A2	A1	A2	A1	A2
No head	In free space		41.8 + j12.3	41.8 + j12.3	−15.9	−15.9	92.0	92.0	89.6	89.6
	In hand1		37.6 + j11.2	49.4 + j2.06	−14.4	−33.3	55.4	65.5	53.5	65.4
	In hand2		72.4 + j28.4	36.4 + j10.1	−10.8	−14.2	32.0	46.1	29.3	44.3
HR-EFH	Cheek	Hand1	42.3 + j16.8	61.5 + j8.64	−14.1	−17.8	19.1	32.0	18.4	31.4
		Hand2	82.8 + j40.9	45.4 + j17.0	−8.5	−14.8	10.5	19.0	9.0	18.3
	Tilt	Hand1	43.6 + j20.9	60.1 + j9.4	−12.8	−18.1	22.3	33.0	21.1	32.5
		Hand2	82.1 + j44.6	45.7 + j18.1	−8.1	−14.4	11.9	20.1	10.1	19.3
Handset model			B1	B2	B1	B2	B1	B2	B1	B2
No head	In free space		42.7 – j1.80	45.5 + j4.0	−21.8	−23.9	94.6	94.0	94.0	93.6
	In hand1		49.4 – j0.33	70.1 + j36.5	−43.1	−9.6	67.0	32.8	67.0	29.2
	In hand2		73.4 + j62.7	50.6 + j25.3	−6.3	−12.2	33.0	38.6	25.3	36.3
HR-EFH	Cheek	Hand1	49.9 + j5.50	73.2 + j38.6	−25.2	−9.1	26.8	16.7	26.7	14.6
		Hand2	74.5 + j75.0	59.3 + J21.1	−5.3	−13.7	12.0	16.6	8.5	15.4
	Tilt	Hand1	40.7 + j2.92	72.6 + j37.6	−19.3	−9.3	28.8	20.9	28.5	18.5
		Hand2	63.4 + J67.5	50.4 + j38.6	−5.6	−9.1	14.2	25.0	10.3	23.2