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