W-band High-octave Source Study

Frequency source is the key device for millimeter wave systems. To obtain desired millimeter-wave signals; the frequency multiplying techniques are extensively used. By using the nonlinear characteristics of the IMPATT diodes, a microwave signal can be multiplied to the millimeter-wave frequency band. It has the advantages of high efficiency, high power level and provides a good approach to realize high quality millimeter-wave signals.In this dissertation, a millimeter-wave frequency source in W-band is designed using the phase-locked dielectric resonator oscillator (PLDRO) and the IMPATT frequency multiplier. The design features low phase noise and high frequency stabilization. It also simplifies the complexity of the frequency source and improves its reliability.The dissertation is arranged as follows. Firstly, based on the mathematical expressions of the nonlinear circuit model for the IMPATT diode; the equivalent circuit is derived. By using it to simulate the characteristics of an IMPATT diode, its high-rank multiplying properties can be analyzed and predicted. Secondly, a PLDRO in C-band is designed to provide the reference signal for the multiplier. The output frequency of the PLDRO is 6.5GHz, and the phase noise is -116.97dBc/Hz@10kHz. Meanwhile, an IMPATT high-rank multiplier is designed by using a novel circuit configuration, which has the maximum output power of 6.1mW and 20.4dB conversion loss. The output frequency of the whole frequency source is at 97.5GHz, and the phase noise is -87.18dBc/Hz@10kHz.