Fig. 2: Microstrip line model.

a Illustration of microstrip line translating from the yellow triangle in Fig. 1f. The width of the microstrip line w0,1,2, corresponds to characteristic impedance Z0,1,2 = 50, 66, 200 Ω. b Field distribution in the OFF state under backward incidence at 2.3 GHz. The color indicates the electric field strength. c The simulated transmission rate (T) under different propagation directions. Red line: forward incidence for 2.05 GHz. Blue line: backward incidence for 2.05 GHz. Red shaded area: forward incidence from 2.03 GHz to 2.15 GHz. Blue shaded area: backward incidence from 2.03 GHz to 2.15 GHz. d The simulated nonreciprocity (NR). Blue line: 2.05 GHz. Blue shaded area: 2.03 GHz to 2.15 GHz.