RF characteristics of the designed sensors at various conformal angles

RF characteristicsSubstrate material at various conformal angles
PVDF-HAP-CS with 17-4PH SSPVDF-HAP-CS with Cu adhesive tape
30°45°30°45°
Dimensions of parts (in mm)Ground plane: 47.48 × 50.00
Substrate: 47.48 × 50.00
Patch: 29.38 × 22.05
Feed: 20.00 × 1.05
Ground plane: 47.48 × 50.00
Substrate: 47.48 × 50.00
Patch: 22.36 × 29.75
Feed: 30.00 × 0.70
Slot cut: 6.00 × 3.50
SAR value (in W/kg)1.0771.238
Gain (in dB)0.541.674.021.892.173.24
Scattering parameters (fr in GHz, S11 in dB)2.39, –10.332.38, –10.632.38, –12.992.43, –18.662.43, –10.992.42, –11.32

PH: precipitate hardened; PVDF-HAP-CS: polyvinylidene fluoride-hydroxyapatite-chitosan; RF: radio frequency; SS: stainless steel. fr is frequency; S11 is reflection coefficient