Fourier Rotman Lens Enabled Directional Modulation Transmitter

Figure 17

Normalized received constellations diagrams in IQ space along directions of (a) 85° and (b) 67°. The symbol rates for both the DQPSK and DBPSK data streams were set to 2.5 Msps. SNR for each receiver case was set to 25.8 dB or 21.2 dB along their desired communication directions, that is, 90° or 72°.

(a)

(b)