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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)