LPNOsc: An X-band Low-Phase-Noise Oscillator Based on Complementary Coupled Resonator

Low-phase microwave oscillators are one of the key components in modern radars for frequency conversion and signal generation. However, it is challenging to design low-phase microwave oscillators while meeting other requirements, i.e., low-profile, low cost, and good DC-RF conversion. Therefore, the manuscript presents an oscillator designed on the complementary coupled resonator (CCR) technique with low-phase noise for X-band applications to address this challenge. The substrate-integrated waveguide (SIW) technology is used for the planar resonator design because of its simple integration with other components. The SIW-based CCR resonators have a high unloaded quality factor (Q(0)). The proposed oscillator produced an output RF signal with 9.77 dBm signal strength at 10 GHz frequency. The CCR resonator has Q(0) 0f 3030 and coupling coefficient (C) value of 1.069. The high figure of merit (FOM) value of -203.5 dBc/Hz and the low-phase noise -141.7 dBc/Hz at 1-MHz offset are the key features of the proposed oscillator that make it an appealing candidate for X-band applications.