If isolation is high, directional couplers are
excellent for combining signals to feed a single line to a
receiver for two-tone receiver tests. In Figure 3, one signal
enters port P and one enters port P , while both exit port 3 2
P . The signal from port P to port P will experience 10 1 3 1
dB of loss, and the signal from port P to port P will have 2 1
0.5 dB loss. The internal load on the isolated port will
dissipate the signal losses from port P and port P . If the 3 2
isolators in Figure 3 are neglected, the isolation
measurement (port P to port P ) determines the amount of 2 3
power from the signal generator F that will be injected into 2
the signal generator F . As the injection level increases, it 1
may cause modulation of signal generator F , or even
If isolation is high, directional couplers areexcellent for combining signals to feed a single line to areceiver for two-tone receiver tests. In Figure 3, one signalenters port P and one enters port P , while both exit port 3 2P . The signal from port P to port P will experience 10 1 3 1dB of loss, and the signal from port P to port P will have 2 10.5 dB loss. The internal load on the isolated port willdissipate the signal losses from port P and port P . If the 3 2isolators in Figure 3 are neglected, the isolationmeasurement (port P to port P ) determines the amount of 2 3power from the signal generator F that will be injected into 2the signal generator F . As the injection level increases, it 1may cause modulation of signal generator F , or even
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