Locked oscillator power combining through a Wilkinson coupler

The paper describes the combining of power for J-band pulsed InP locked oscillators via a Wilkinson coupler. A simple theoretical model for a pulsed locked oscillator is presented. The model is then used to demonstrate the power combination of two pulsed locked oscillators via a Wilkinson coupler. The resulting bandwidth and combining efficiency are very sensitive to the Q-chirp products, values of external Q and relative output amplitudes of the oscillators. The theoretical results are compared with experimental data, and it is concluded that this technique of power-combining pulsed J-band sources will only give a useful operational bandwidth of 1-2%.