Design of millimeter wave self-oscillating mixer with substrate integrated waveguide technique.

摘要

In this thesis, the substrate integrated waveguide (SIW) technique was applied in the design of millimeter-wave self-oscillating mixer (SOM). A feedback oscillator structure was used in the SOM design, and the feedback SOM concept was simulated by ADS (Advanced Design System). First, a conventional SOM was built first with a parallel coupled microstrip line as a feedback resonator, and then a novel SIW SOM was designed and measured for the first time. The phase noise performances of these two circuits were measured and compared, which indicates that SIW SOM can provide a phase noise with 10dB to 20 dB less than that of the conventional SOM.; An improved design of SIW SOM, based on the SIW cavity and feedback SOM work principle, is presented. With the new technique, no amplifier design is needed, and almost no tuning is required, which is attractive in microwave circuits design. This technique makes the system very practical in industrial application. The closed loop gain, reduced by port mismatch in the new design, is analyzed. (Abstract shortened by UMI.)