An oscillator with low phase noise and superior harmonic suppression characteristics based on uniplanar compact split ring resonators

Abstract

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]

Novel triple‐mode resonators using split‐ring resonator

“…In this study, split-ring resonator (SRR) is studied to achieve three pass bands for further filter design. SRR is proposed by Pendry to provide negative permeability [6] and used in many microwave components and antennas' applications [7][8][9][10]. Here SRRs are printed on the substrate with ground plane.…”