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