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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: IEEE Trans Biomed Eng. 2014 Apr 15;61(7):2154–2160. doi: 10.1109/TBME.2014.2317484

Fig. 5.

Fig. 5

Determination of operating frequency bandwidth Δf where S11 ≤ −10 dB for substrates RO3010 (εr,substrate = 10.2), RO3006 (εr,substrate = 6.15) and RO3003 (εr,substrate = 3): a) Δf vs. log-spiral turns N, and b) average antenna efficiency ηΔf vs. N. Nominal values: δ = 1 mm and εr,coverlay = 30.