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Table 1 Spiral antenna characteristics

From: Characterization of path loss and absorption for a wireless radio frequency link between an in-body endoscopy capsule and a receiver outside the body

Characteristic Value
Length (L) 81 mm
Height (H) 5 mm
Gap size (g) 4 mm
Resonance frequency 402 MHz
S11 at 402 MHz −5.5 dB
−5 dB Bandwidth >45 MHz
(muscle, skin, esophagus)