Fourier Rotman Lens Enabled Directional Modulation Transmitter

Figure 11

Power normalized detected (a) DQPSK and (b) DBPSK constellation diagrams in IQ space along 90° and 72°, when the 7th and the 9th beam ports of the Fourier Rotman lens were excited with DQPSK and DBPSK signals, respectively. The SNR for each case was set to 13.8 dB and 9.2 dB.

(a)

(b)