Fourier Rotman Lens Enabled Directional Modulation Transmitter

Figure 15

Normalized received constellation diagrams for the DQPSK system with (a) no interference, (b) −5 dB interference at the 6th and the 8th beam ports, (c) 0 dB interference at the 6th and the 8th beam ports, and (d) 5 dB interference at the 6th and the 8th beam ports along 122°. The DQPSK data stream with 0 dB power was applied at the 7th beam port. The SNR along boresight was set to 25.8 dB.

(a)

(b)

(c)

(d)