Composite right-/left-handed transmission line stub resonators for X-band low phase-noise oscillators

Shinichi Tanaka, Hiroki Nishizawa, Kei Takata

Research output: Contribution to journalArticlepeer-review


This paper describes a novel composite right-/left-handed (CRLH) transmission line (TL) stub resonator for X-band low phase-noise oscillator application. The bandpass filter type resonator composed only of microstrip components exhibits unloaded-Q exceeding that of microstripline resonators by engineering the dispersion relation for the CRLH TL. Two different types of stub resonator using identical and non-identical unitcells are compared. Although the latter type was found to be superior to the former in terms of spurious frequency responses and the circuit size, care was taken to prevent the parasitic inductances distributed in the interdigital capacitors from impeding the Q-factor control capability of the resonator. The stub resonator thus optimized was applied to an 8.8-GHz SiGe HBT oscillator, which achieved a phase-noise of -134 dBc/Hz at 1-MHz offset despite the modest dielectric loss tangent of the PCB laminate used as the substrate of the circuit.

Original languageEnglish
Pages (from-to)734-743
Number of pages10
JournalIEICE Transactions on Electronics
Issue number10
Publication statusPublished - 2018 Oct


  • Left-handed metamaterials
  • Low phase noise oscillators
  • Q-factors
  • Resonators

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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