In the datasheets, 1.2 is stated as the peak forward voltage.A continuous forward current of 1 is the maximum consumption of this device.RF diode is necessary to operate the device at a DC reverse voltage below 100.
1N4934 R0 Features
the forward peak voltage is 1.2
1N4934 R0 Applications
There are a lot of Taiwan Semiconductor 1N4934 R0 applications of RF diodes.