A low phase-noise microwave oscillator using a substrate integrated waveguide resonator based on complementary split ring resonator

In this paper, a low phase-noise oscillator using a complementary split ring resonator (CSRR) based on a substrate integrated waveguide (SIW) has been proposed and developed for microwave applications. The substrate integrated concept is applied to implement an oscillator circuit. The unloaded Q factor of the SIW cavity is increased by loading a complementary split ring resonator (CSRR). A detailed explanation for generation of the resonant frequency has been illuminated. It is shown that the low phase-noise oscillator is developed by taking advantage of the high Q factor of the CSRR-loaded SIW structure. An unloaded Q-factor (Q_U) of the designed resonator is 1960. Measured results show that the oscillation frequency is located at 9.3 GHz. The amplitude of output power is able to deliver 11.3 dBm and phase-noise of -122.3 dBc/Hz at a 1-MHz offset. The implementation of this type oscillator can be easily realized and appropriate for low cost microwave and millimeter-wave applications.