Fig. 2
From: Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity
Isolator based on a delay line with time-varying resistors. a Schematic and operation diagram of the isolator. The circuit is the same as in the case of the non-reciprocal phase shifter, with the only difference that the time-varying resistors are modulated between 0 and a finite value R max. b Forward (S 21) and reverse (S 12) transmission versus R max for ω = (2n + 1)ω s. c Scattering parameters of a double-branch isolator with complementarily clocked switches (f s = 8.33 GHz), exhibiting ideal transmission, matching and isolation. The transmission line impedance is set to Z = 2Z 0 and R max ≈ 8Z 0. Ideal isolation is achieved at 25 GHz (n = 1). The inset shows the corresponding network schematic and clocks
