Mechanically Tunable Oscillator Based on Air-filled Folded Substrate Integrated Waveguide Cavity

Zhang, Qingyuan; Meng, Xuefeng; Qiao, Yang

doi:10.1109/apmc46564.2019.9038757

Cited by 1 publication

(1 citation statement)

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“…At an oscillation frequency of 9.04 GHz, the measured phase noise is −111.9 dBc/Hz at 100 kHz offset. More examples can be found out in [16][17][18][19][20][21]. Unfortunately, there is no theoretical prediction on the lowest limit for phase noise.…”

Section: Introductionmentioning

confidence: 99%

Low phase noise microwave oscillator with greater than 60 dB second‐harmonic suppression

Yang²,

Yang

et al. 2021

IET Microwaves Antenna & Prop

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This study presents a microwave oscillator in which an innovative hybrid microstrip and substrate integrated waveguide filter is proposed for phase noise reduction. By virtue of equivalent circuit, the specific topology of this filter is clearly revealed and verified by both the simulation and the experiment. It can realize a third-order elliptic bandpass response with two transmission zeros near the passband. Specific phase response can be formed, in which a high group delay can be achieved within a narrow frequency range around the centre frequency. This feature makes the filter performance very flexible for its application in microwave oscillator, and then reduces its phase noise. For demonstration, an oscillator example at 9.0 GHz was deigned, fabricated and measured. The measured phase noise at 100 kHz away from the oscillation frequency is as low as −120.06 dBc/Hz. Furthermore, the proposed oscillator is featured by greater than 60 dB second-harmonic suppression and at least the third harmonic is suppressed.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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