An oscillator array using push-push oscillators and very simple coupling circuits

A novel Push-Push oscillator array with simple structure is proposed. The Push-Push oscillators are connected via a coupling circuit whose structure is very simple. The phase shift between the output signals of the oscillators is achieved by controlling the phase difference of the reflection coefficients of the coupling circuit. The phase difference is changed by the bias voltage of the HEMT used for the coupling circuit. The basic performance of the oscillator array using two Push-Push oscillators is investigated. The phase shift produced between the output signals of two oscillators is 114 degrees at 15.4 GHz.