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- W24197166 abstract "One of the key parameters to achieve high spectral purity microwave oscillators is the resonator Q-factor. Ultra high performances have been already demonstrated in X-band with Sapphire resonator. SiO2 monocrystal is another dielectric material to be considered. It presents low dielectric losses, is low coast and available in large size and high purity. We present the evaluation of a 26GHz-oscillator using a SiO2 monocrystal Whispering gallery mode resonator as frequency reference. The SiO2 resonator features a loaded Q-factor of 23000 leading to a phase noise SΦ (1kHz) = –73 dB.rad2.Hz. This first prototype though not yet completely optimised demonstrates the potentiality of dielectric quartz resonator for the achievement of low phase noise microwave source . Introduction : Achievement of low phase noise microwave oscillators concerns number of scientific and technological applications such as fundamental and applied metrology, radar and telecommunication systems. According to well known Leeson model [1], the power spectral density of phase fluctuations Sφ(f) of an oscillator is related to its resonator loaded Qfactor by : ( ) ( ) f S f Q f S L Θ Φ = . 1 . . 2 2 2" @default.
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- W24197166 date "2002-01-01" @default.
- W24197166 modified "2023-09-26" @default.
- W24197166 title "High spectral purity 26 GHz oscillator based on a SiO2 Whispering Gallery Mode Resonator" @default.
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