Figure 4 ­ Progressive phase shift for array ports exciting beam

ports 4 and 5.

Figure 7 - Progressive phase shift for array ports exciting beam ports

1 and 8.

As a Rotman lens is supposed to be a wideband "true-time delay"

beamformer [4], we expect to observer a linear phase shift at each

output port as a function of frequency. Such a plot is presented in

Figure 8. For this plot, we observe the phase shift measured between

beam port #2 and the array port #9. Again we note good linearity -

indicating a stable beam position over a wide frequency range.

Similar plots are obtained for the matrix of other beam and array

ports.

Figure 5 - Progressive phase shift for array ports exciting beam ports

3 and 6.

Figure 8 ­ Measured phase between beam port #2 and the array port

#9 versus frequency.

Figure 6 - Progressive phase shift for array ports exciting beam ports

2 and 7.

3