| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 94 === To fulfill the increasing demand for wireless communication applications nowadays, the research and development of millimeter-wave components and modules are becoming essential. Oscillators are key components in such radio frequency (RF) systems. However, generating highly stable signals at high frequencies is challenging because of the frequency limitation of device and the rising influences of device parasitic effects. Harmonic oscillators have been proven to be an efficient way to generate high frequency signals; furthermore, the substrate integrated waveguide (SIW) technique was proposed recently, which possesses the properties of low-loss and high-density integration of microwave/millimeter-wave circuits. Thus, a SIW cavity resonator can be incorporated into the oscillator design to achieve a low phase noise response.
In this thesis, two topologies of harmonic oscillators are employed: one is the push-push oscillator and the other one is the osciplier. Then, by properly exciting the resonant mode of the cavity resonator, certain mode characteristics are applicable to the oscillator design. In the push-push oscillator, a SIW cavity resonator of its TE102 mode at 15 GHz for the fundamental oscillation is designed and acts as the coupling network of the two sub-oscillators. In the osciplier, the SIW cavity resonator is, on the other hand, designed with its TE101 mode at 15 GHz and acts as the feedback network of the oscillator. Both harmonic oscillators are designed to generate 30 GHz output signals, which are the second harmonic, and fabricated in printed-circuit-board (PCB) process.
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