A compact low-phase noise oscillator with superior harmonic suppression characteristics based on novel nested split-ring resonator (NSRR)

Abstract

In this paper, a novel microwave oscillator incorporating miniaturized nested split-ring resonators is proposed. The high-quality (Q) factor and wide spurious-free band of the NSRR contribute to low-phase noise and high-harmonic suppression of the proposed oscillator circuits. In addition, the NSRR is featured by compact size of 0.12λg × 0.12λg, where λg is the guided wavelength of resonance frequency. The fabricated 2.4 GHz oscillator has an output power of 11.7 dBm with 5 V DC supply and 10 mA current consumption. The second harmonic suppression is −45.49 dBc, the phase noise is −110 dBc/Hz @100 kHz, and the DC–RF conversion efficiency is measured as 30%.

A modified Jerusalem microstrip filter and its complementary for low phase noise X-band oscillator

“…The other technique for designing LPN MPOs is based on microstrip filters (MFs) [13][14][15][16], the example of which are microstrip elliptic oscillators [17,18] and microstrip voltagecontrolled oscillators (VCOs) [19]. These microstrip oscillators (MOs) possess some advantages in designing including high Q-factor, mass production, low fabrication cost, miniaturized, and ease-of-integration in MMICs and RFICs structures [20][21][22]. Also, they are used in low frequency bands [23,24].…”

An Equivalent Circuit Model for Nested Split-Ring Resonators

“…The NSRR structure was employed in different antenna designs in microwave and optical frequencies [24]- [26]. A compact low-phase noise oscillator with superior harmonic suppression characteristics was developed with NSRR geometry [27]. Additionally, a compact NSRR-based filter [28] and an NSRR microwave thin-film sensor [29] were shown.…”