Trapped Inverted Microstrip (TIM) Circuits for Combining the Outputs of High-Power IMPATT Oscillators

High-power IMPATT oscillators were combined through balanced hybrids realized in trapped inverted microstrip (TIM) line. Combining efficiencies approached 80 percent, with CW power outputs of 42 W at 5 GHz and 22 W at 9.3 GHz from four-oscillator arrays.