Review of microwave studies made at Thomson-CSF for the implementation of fully solid state radars

It is pointed out that the use of semiconductors in microwave technology has opened the way to the employment of solid-state radars in early warning and low-altitude detection. The possibilities for the detection of low-altitude targets are improved by the use of millimetric waves. The present investigation is concerned with a number of studies conducted in the area of microwave technology and the devices produced in connection with these studies. Developments related to PIN-diode phase shifters are discussed, taking into account the loaded-line phase shifter, the switched-line phase shifter, and the inverted field phase shifter. Studies concerning solid-state transmitters and millimetric devices are also described, giving attention to S-band transmitter modules, an L-band transmitter module, a balanced mixer, a diode protection device, and a 94 GHz duplexer.