Three Millimeter Wave Instantaneous Frequency Measurement

3mm band (93-95GHz) IFM (Instantaneous Frequency Measurement) technology is discussed in this thesis. Because of the high frequency, it's difficult to focus on the 3mm band IFM technology directly. The project is designed the IFM circuit by changing the signal frequency from 3mm wave to X band using 3mm band sub-harmonic mixer.Firstly, the theory and design method of 3mm Band Sub-harmonic Mixer are introduced in this thesis.Secondly, this thesis discusses the circuit design of X band IFM based on interferometer theory containing the frequency- phase - magnitude translation process. The theoretical analysis of time domain about X band microwave discriminator is introduced deeply. Combined with the theory results, the error analysis model of discriminator is established, and the influence to Millimeter-wave discriminator is discussed when the magnitude and phase aren't consistent in divider and coupler respectively, the numerical simulation can get the error results.The X band Millimeter-wave discriminator is simulated referring to error results and making use of ADS electromagnetic simulation software based on the theory. It's mainly described that the key technology including the circuit and layout design, simulation and optimization process of divider and coupler, then the pressed circuit boards are fabricated and tested, and the measurement results are reported. Millimeter-wave discriminator is according with the theory analysis basically, and is achieved the translation function that is from frequency information to phase information.The data processing circuit board controlled by processor is fabricated, for getting the magnitude information by phase information, which includes the frequency information. The theory, circuit design and measurement results of the peak-value retain-ability circuits are introduced in the data processing circuit., and the data processing procedure is compiled, which is downloaded to be tested and accomplished the translation function from phase information to magnitude information.