Fourier Rotman Lens Enabled Directional Modulation Transmitter

Figure 18

Measured BER results for (a) the DQPSK and (b) the DBPSK type receivers in the dual-beam DM systems. The DQPSK signals and the DBPSK signals with the same power were applied at the 7th and the 9th beam ports of the Fourier Rotman lens, respectively. The same interference excited the remaining 11 beam ports. SNR for each receiver case was set to 25.8 dB or 21.2 dB.

(a)

(b)