Miniaturization of Double Stub Resonators Using Lumped-Element Capacitors for MMIC Applications

Shinichi TANAKA  Takao KATAYOSE  Hiroki NISHIZAWA  Ken'ichi HOSOYA  Ryo ISHIKAWA  Kazuhiko HONJO  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.7   pp.830-836
Publication Date: 2016/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.830
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
resonator,  Q-factor,  microstrip line,  coplanar waveguide,  MMIC,  oscillators,  phase noise,  

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We present a design method for miniaturizing double stub resonators that are potentially very useful for wide range of applications but have limited usage for MMICs due to their large footprint. The analytical design model, which we introduce in this paper, allows for determining the capacitances needed to achieve the targeted shrinking ratio while maintaining the original loaded-Q before miniaturization. To verify the model, 18-GHz stub resonators that are around 40% of the original sizes were designed and fabricated in GaAs MMIC technology. The effectiveness of the proposed technique is also demonstrated by a 9-GHz low phase-noise oscillator using the miniaturized resonator.