Microstrip Square Open-Loop Multiple Split-Ring Resonator for Low-Phase-Noise VCO

摘要

In this paper, we present a novel voltage-controlled oscillator (VCO) using the microstrip square open-loop multiple split-ring resonator for reducing the phase noise of VCO. We realize the microstrip square open-loop multiple split-ring resonator by combining the multiple split-ring resonator with the microstrip square open-loop structure. Compared with the conventional microstrip square open-loop resonator, the microstrip square open-loop multiple split-ring resonator has strong coupling between the microstrips of the open-loops with the multiple split-ring resonators, which makes for a high $Q,$value of the resonator. The phase noise and the tuning range of the proposed VCO are $-124.5 hbox{ to }-122.0~hbox{dBc/Hz}$ at 100 kHz and $5.746 hbox{ to }5.84~hbox{GHz}$. The figure-of- merit (FOM) of this VCO is $-203.96 hbox{ to }-201.6~hbox{dBc/Hz}$ at 100 kHz in the same tuning range.