On The Millimeter-wave Frequency Converter And Its Local Oscillator Multiplier Chain

In the Microwave and Milli-wave system,the performance of the up-mixers play a key role in the whole system.This dissetation make a research in the theoretics and design of the Milli-wave up-mixers and the LO Multipliers.The major job is manufactured a transmitter,which has three upmixer channels.Its function is to up convert the signals from C-band to Ka-band.The input local oscillator is provided by a low frequency crystal oscillator which has a good performance of phase noise,through 512 times multiply to Ka band.This sysetem is used in the laboratory as transmitter source of the fuze,for the multidimensional objects in practise ,which lead to the complexity of the reflect signal ,so the amplitude,frequency and the phase of the transmit signals both have a key role in dealing with the reflection signals.Therefore,this system requires for both the coherence of the single channel's amplitude ,phase and multi channels.Because the phase noise of the input crystal oscillator is excellent to 150dBc@10KHz,we don't adopt the PLL method to yield the LO souce,but multiply the input signal.For to discard the harmonious frequencies yield by the multiplier,we have connected narrow-band filter between the circuit,and connected the isolator to reduce the interferes bring by the feedback signal of the amplifier.According to the frequency of the LO system,we aparted the whole LO system to two subsystems, and fixed in the different capsules. In addition,considering the coherence of the LO signal,we divided it at the Ku-band but not the Ka-band,then multiply to the Ka-band separately.The results of the test demonstrated that the system has a good performance in the linearity, dynamic scope,isolation,coherence of the amplitude.The group delay of the upmixers is 2ns,which is better than other domestic manufactures.Because the inconsistency between the isolation and the phase coherence,and the error of the test method,we haven't gotten the good performance of the phase coherence.The next work is improving the restrain of the filter to the LO signal and the phase test methods.