A low phase noise oscillator using SIW combline resonator

A low phase noise oscillator based on substrate integrated waveguide (SIW) combline resonator is presented. By taking high-Q advantage of the resonator's superior characteristics, the proposed oscillator possesses low phase noise performance with a compact size. For validating the idea, an oscillator operating at X-band is designed and fabricated. The measured results show that at the oscillation frequency of 10.07 GHz with − 0.7 dBm output power, the phase noise is −127.25 dBc/Hz at 1 MHz frequency offset.