Dual-Band Complementary Split-Ring Resonator (Csrr) With High-Quality Factor and Its Applications in Low Phase Noise Oscillators and Small Multi-Band Diplexers and Filters

Abstract

Abstract-Low-Loss resonators with high Q factor have special importance in modern microwave telecommunications systems. In this paper, a modern dual-band CSRR with high Q factor is first examined using SIW technology on a surface waveguide. It should be noted that the proposed structure paves suitable way for emitting and propagating wave in two passing bands (approx. 4.7 and 5.3 GHz) below cutoff frequency waveguide. High Q factor and its high small-sized percentage is the salient specification of this structure as compared to other similar planar resonators proposed in various references.At the end of this paper, three applications of this resonator are studied in designing a small multiband filter with high Q factor, a small multi-band diplexer with low passage bandwidth and a planar oscillator with low-phase noise. According to the scientific literature, the proposed oscillator was found to enjoy the best performance at low phase noise for planar microwave oscillators.

Dual-Band High Q-Factor Complementary Split-Ring Resonators Using Substrate Integrated Waveguide Method and Their Applications

“…As seen, the frequency bandpass and group delay are nearly 6.8 GHz and 0.5 ns for the layout employed in [3] and 5.3 GHz and 4 ns for the layout recommended in the present study. Even though greater degrees of miniaturization and additional group delay can be Figure 2: Configurations of (a) the base layout used in [3] and (b) the proposed base layout for SIW-CSRR unit cells [9].…”

“…Figure 6(a) schematically draws the structure of the first suggested resonator and its optimized sizes [9]. According to the figure, it resembles the structure shown in Figure 2, except for a pair of nonevents suggested CSRRs would be chosen and imprinted on the waveguide metal cover, which results in the formation of 2 forward-wave passband below the cutoff frequency.…”

“…for a certain frequency range. Nevertheless, they have a full ability to justify the transmission features of the structures [9].…”

“…ese kinds of high Q-Factor resonators are significantly used in telecommunication and electronic communications. e compact multiband filter design is an example of such resonators [9]. Designing a convenient high-order filter through n aligned SIW-CSRRs would also be feasible.…”

A 2.4 GHZ High-Efficiency Low Phase Noise Oscillator Using Combined Band Pass Filter for Harmonic Suppression

“…However, the primary issue with planar resonators is that they do not have high unloaded Q and are therefore not suitable for low-phase noise oscillators. For achieving high-Q in planar structures, active filters [7], higher-order BPFs [8], and other techniques [9] were reported. However, active filter had frequency stability, noise, and complex design difficulties, whereas higher-order BPFs occupy large area on the substrate, and their rejection level in stopband also increases.…”