Cushman, Darby and Cushman
Microwave mixer circuit
 In a microwave mixer circuit, two diodes connected in series are formed in a semi-insulating semiconductor substrate. A power distributing circuit is connected across the series circuit of the diodes. One of the connecting points is connected to a first signal terminal. A line connecting the two diodes in series is connected to the second signal input terminal and through a low-pass filter element to an intermediate frequency output terminal. 
Kabushiki Kaisha Toshiba
H
H03D
inventional
Shigeru Naotaka Shigekazu
Watanabe Tomita Hori