Abstract
A low phase-noise planar X-band oscillator using high-Q substrate integrated waveguide (SIW) bandpass filter within its feedback loop is presented.The SIW filter as a frequency stabilization element is used in planar oscillator, and the phase noise of oscillator is significantly reduced by the group-delay peaks formed at the passband edges of the high-Q SIW filter. A 9-GHz oscillator using the optimized high-Q SIW filter in the feedback loop is designed and tested. The measured phase noise of planar oscillator is 115.3 dBc/Hz at 100-KHz offset frequency with 9.97-dBm as output power. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26047
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