ovel resonators to enhance the performance of a Voltage-Controlled-Oscillator (VCO) utilizing single and double ring resonators to improve the loaded-quality (QL) factor of the resonator are introduced, and their effectiveness is demonstrated by designing low-phase-noise (PN) K-band VCO. Also, the size of the double-ring-resonator (DRR) is compacted by 40% and its QL-factor is increased. The resonators are designed using HFSS. First Complementary-Single-Split-Ring (CSSRR) is designed and optimized to maximize its QL-factor, then three resonators (meander-line-split-ring, double-ring, compacted-double-ring resonators) are studied to increase their QL-factor compared to the CSSRR. The QL-factor of the DRR is 30 ± 1 at 20–60 GHz with a size of 140 µm*90 µm while the compacted-double-ring-resonator (Compacted DRR) has a size of 120 µm*60 µm and its QL-factor is increased by 25% compared to |
