Spherical Helices for Resonant Wireless Power Transfer

Table 3

Single-arm SHA configurations’ resonant properties.

One-arm SHA	𝑎 (cm)	𝜓 (°)	𝑓res (MHz)	𝑘res𝑎	𝑅^rad (Ω)	𝜂rad (%)	𝛼
Open-ended SS-SHA	2.5	3.64	162.1	0.085	0.40	30.8	0.44
Open-ended RS-SHA	2.5	2.83	162.0	0.085	0.43	22.9	3𝑒−4
Loop SS-SHA	2.5	1.95	161.9	0.085	0.38	19.9	0.14
Loop RS-SHA	2.5	1.63	160.5	0.085	0.61	20.1	5𝑒−5
Loop SS-SHA with C = 2.8 pF	2.5	7.50	162.3	0.085	0.23	6.3	2.23