Figure 5
The structures and the numerical result: (a) the schematic diagram of two bilateral grooves with center distance \(d\) on the microstrip line, (b) the schematic diagram of two unilateral grooves with center distance \(d\) on the microstrip line, (c) the change in the instantaneous impedance of two bilateral grooves when the center distance varies, and (d) the change in the instantaneous impedance of two unilateral grooves when the center distance varies.
