Design of Low-Profile Frequency-Selective Rasorbers Based on Three-Legged Loaded Element

Table 1

Performance comparison.

Reference	Transmission band (fT)/IL	FBW (%)	Periodicity	Number of lumped elements	Angular stability
[11]	4.42 GHz/−0.68 dB	92.3	0.37 λt	18	0–30°
[12]	3.54 GHz/−0.92 dB	116.9	0.3 λt	8	0–40°
[14]	6.62 GHz/−0.4 dB	98.8	0.44 λt	16	0–45°
[15]	4.25 GHz/−0.26 dB	101	0.35 λt	8	0–30°
[16]	10.3 GHz/−0.3 dB	108.3	0.52 λt	8	0–45°
[17]	2.2 GHz/−0.5 dB	114.1	0.18 λt	8	0–40°
This work	4.18 GHz/−0.22 dB	101	0.31 λt	6	0–40°

Ref. = reference number, IL = insertion loss, FBW = fractional bandwidth of −10 dB reflection, and λ_t = free space wavelength at the transmission frequency f_T.