The apparatus comprises an arrangement of resonant cells, each resonant cell being of {HEAD ~ small dimension} relative to {TAIL ~ the wavelength} 
relative to
The apparatus comprises an arrangement of resonant cells , each resonant cell being of { HEAD ~ small dimension } relative to { TAIL ~ the wavelength }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL