Vector network analyzer and spread spectrum module thereof

The invention relates to a vector network analyzer and a spread spectrum module thereof. A radio frequency multiplier circuit, a local oscillator frequency multiplier circuit and a down-conversion circuit are formed in the spread spectrum module; the radio frequency multiplier circuit is connected to one signal input interface and is provided with a plurality of first frequency band channels and directional couplers arranged at the tail ends of the first frequency band channels, and the dual-directional coupler is further connected with the down-conversion circuit and the test port; the localoscillator frequency multiplier circuit is provided with a plurality of second frequency band channels in one-to-one correspondence with the frequency bands of the first frequency band channels, and the second frequency band channels are connected to the other signal input interface and the down-conversion circuit; and the down-conversion circuit is used for carrying out down-conversion on the forward signal and the rever