rf stimullus

i don,t know rf design, i see a rf mixer ciucuit, it,s dc bias series with a resistor ,why? 2.4G sin stimulus with a 50 oumu resistor and 10p capacitance, who can explain it

i want to learn rf ,but don,t know how to begin, who can figure out

Basically the 50Ohms of resistor would be for input matching and the capacitor serves as a dc block from the input signal.

Rgds