This may lead to a worsening of the efficiency of {HEAD ~ conversion} to received {TAIL ~ voltage} above and below a threshold level used for varying the resonance frequency 
This may lead to a worsening of the efficiency of { HEAD ~ conversion } to received { TAIL ~ voltage } above and below a threshold level used for varying the resonance frequency
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH