In the datasheets, 1.3 is stated as the peak forward voltage.A continuous forward current of 1 is the maximum consumption of this device.A forward voltage of over 1.3(V) is recommended for the system.
RS1G R2G Features
the forward peak voltage is 1.3
RS1G R2G Applications
There are a lot of Taiwan Semiconductor RS1G R2G applications of RF diodes.