Fig. 5
From: Gain enhancement for wideband end-fire antenna design with artificial material
a Simulated S-parameters (S21) of the SRR unit. b Retrieved parameters from the simulated S-parameters of the SRR unit. Type A: \(L_s1=2\) mm, \(L_s2=3\) mm, \(L_s3=0.83\) mm. Type B: \(L_s1=2\) mm, \(L_s2=2.5\) mm, \(L_s3=0.83\) mm. Type C: \(L_s1=2\) mm, \(L_s2=3\) mm, \(L_s3=0.95\) mm. Type D: No SRR is loaded, only substrate without copper is used