Embedded Spiral Microstrip Implantable Antenna

Table 2

Calculated efficiency.

Superstrate	Substrate	Eff. in air (%) at far field	Eff. in muscle (%) at 1 m; from the center of antenna
RT6010	RT6010	96.82	16.1
Macor	RT6010	82.47	4.47
Teflon	RT6010	90.76	6.36
RT6010	Macor	86.38	9.74
RT6010	Teflon	92.089	9.62