Figure 6: Measured transmission coefficient (S21) distributions for different transmitter (lT) and receiver (lR) OAM modes when the separation distance between the Tx and Rx is 2 [m].
During the measurement, lT was fixed and lR was manually chosen by connecting a spectrum analyzer to the corresponding OAM mode port of the OAM mode mux. (a–c) lR = 0, lR = +1, lR = −1 for lT = 0, respectively. (d–f) lR = 0, lR = +1, lR = −1 for lT = +1, respectively. (g–i) lR = 0, lR = +1, lR = −1 for lT = −1, respectively.
