Table 2.

Design procedure for 2‐bit digital units of frequency coding metamaterials

		Phase response over frequency (2‐bit)
Units	Phase [deg]	Phase approximation [deg]	Spatial domain code	Phase sensitivity over frequency band [deg GHz−1]	Sensitivity approximation [deg GHz−1]	Frequency domain code	Total code
	149	140	“00”	−29/4.5	0/4.5	“00”	“00–00”
	140	140	“00”	−125/4.5	−90/4.5	“01”	“00–01”
	139	140	“00”	−224/4.5	−180/4.5	“10”	“00–10”
	135	140	“00”	−288/4.5	−270/4.5	“11”	“00–11”