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 Journal of the Korean Institute of Electromagnetic and Science 2005;5(4):204-207.
 A Novel Phase Noise Reduction In Oscillator Using PBG(Photonic Band Gap) Structure and Feedforward Circuit Chul-Hun Seo School of Electronic Engineering, Soongsil University Abstract In this paper, PBG structure and feedforward circuit has been used to suppress the phase noise of the oscillator. Microstrip line resonator have low Q, but we can obtain high LO power by feedforward circuit and improve the resonator Q by the PBG, simultaneously. The proposed oscillator which uses PBG and feedforward circuit shows 0${~}$20 dB phase noise reduction compared to the conventional oscillator. We have obtained -115.8 dBc of phase noise at 100 kHz offset from 2.4 GHz center. Key words: Phase Noise, PBG, Feedforward, Oscillator, Circuit
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