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In this paper, we describe a novel microwave oscillator incorporating a CPW-based split-ring resonator (SRR) as a resonant component of the circuit. The high quality (Q) factor and spurious-free SRR contribute to phase noise reduction as well as the harmonic tuning of the oscillator circuit in a very small chip area. The fabricated 5.5-GHz oscillator showed an output power of 2.774 dBm with a 2 nd -harmonic suppression of Ϫ43.04 dB and phase noise of Ϫ100.8 dBc/Hz at 100-kHz offset. The proposed oscillator is believed to be the first application of a metamaterial to the performance enhancement of a microwave active device. ABSTRACT: A highly birefringent microstructured optical fiber (HB-MOF) is investigated by using a UPML-FDFD method.Based on the numerical results, the influence of the air-hole size and pitch upon the mode birefringence, confinement loss, and single-mode properties is analyzed. These properties and the influence among them are considered synthetically. Using the effective-area method, the mode-cutoff property of HB-MOF is studied for the first time and the wavelength range for single-mode operation can be obtained accurately. Figure 5 (a) Typical output spectrum and (b) harmonic characteristic of the fabricated oscillator (V ds ϭ 1.5 V and V gs ϭ Ϫ0.2 V). [Color figure can be viewed in the online issue, which is available at www. interscience.wiley.com]

This paper presents a novel microwave oscillator incorporating a simple microstrip ring-type resonant cell as its terminating resonance component. Reduced chip size, higher DC-AC power efficiency, and superior harmonic characteristics can be achieved from the introduction of this type of compact microstrip ring resonator cell. The oscillator provides a second harmonic suppression of 26.51 dB and an output power of 2.046 dBm, with 28% efficiency at an oscillation frequency of 2.11 GHz.

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This article presents a new microwave oscillator incorporating a corrugated coplanar waveguide (CCPW) electromagnetic bandgap structure as its terminating resonance component. The fully planar CCPW oscillator, oscillating at a frequency of 5.41 GHz, showed a phase noise reduction of 8 dB at 1 MHz offset and an increased second harmonic suppression of 10.16 dB and results in DC‐AC power efficiency enhancement of 7.2% when compared to those of a conventional CPW oscillator without the CCPW structure. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1843–1846, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21780