Low Phase Noise Oscillator Using Microstrip Square Open Loop Resonator

The microstrip square open loop resonator has been employed to reduce the phase noise in the oscillator. The square open loop resonator has a large coupling coefficient value, which makes a high Q value, and has reduced the phase noise of the oscillator. This oscillator has presented the oscillation frequency of 5.84 GHz and the phase noise of -113.17 dBc/Hz at an offset frequency of 100 kHz. The phase noise of the oscillator using microstrip square open loop resonator has been reduced -17 dBc/Hz at an offset frequency of 100 kHz compared with that of the conventional structure of the oscillator