Abstract
This paper demonstrates the realization of tunable microwave low phase noise oscillators. A ceramic-based dielectric resonator enclosed in a metallic cavity with an unloaded <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> of 13000 is proposed. The relationship between geometric parameters and resonant frequency is determined. The dielectric puck is then incorporated into multilayer printed circuit boards by using substrate-integrated waveguide techniques. The results show that the resonator resonates at TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01δ</sub> mode with a frequency of 13.3 GHz. Therefore, 13.3 GHz dielectric resonator oscillators with both mechanic and electronic tuning are built. The oscillator includes a pseudomorphic high-electron-mobility transistor low-noise amplifier and an electronic phase shifter. The measured phase noise of the oscillator is -121.7 dBc/Hz at a 10-kHz offset. The calculated and measured phase noise results show a difference of 3 dB.
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