TE210 mode balanced oscillator using substrate integrated waveguide resonator

A new balanced oscillator is proposed to generate anti-phase sources at K_u band. The proposed oscillator is stabilised with the TE₂₁₀ differential mode of a single planar substrate integrated waveguide (SIW) rectangular cavity with mutually locked dual anti-phase outputs. The unloaded-Q of this resonator extracted through mixed mode S-parameters is 370 at 14 GHz. The differential coupling mechanism is presented and the coupling coefficient is parametrically studied. The proposed balanced oscillator provides 6.9 and 7.2 dBm output power for each balanced output with a phase noise of -101 dBc/Hz at 100 kHz offset measured at 14 GHz. The amplitude and phase balances of the two output signals are verified with measurement. The combined differential output power is 10.8 dBm and the phase noise is -109 dBc/Hz at 100 kHz offset.