Thomson-csf

Jean-Jacques Godart

Paul C Moutou

Bernard Le Clerc

Paul-Cyril Moutou

A device using a dielectric resonator with a very low temperature coefficient in a very high frequency transistor oscillator (3 to 10 GHz) so as to benefit both from the very high power available and the maximum frequency stabilization due to the resonator. In the case of a FET, the gate is connected to one end of a line coupled to a dielectric resonator at a point along the line situated at a quarter wavelength from the other end of the line, which in turn is connected through a discrete resistor to a half wavelength open circuit line. Thus, the oscillation is damped when the frequency varies from the resonant frequency of the resonator.

Microstrip transistor oscillator with dielectric resonator stabilization

In a Gunn effect device the cathode contact is formed by an assembly of zones through which is effected the injection of current adjoining an assembly of zones which on the contrary are capable of blocking this injection. A layer of dielectric material possibly insulates these two types of zones. A metallic control electrode assures the arrival of the current. The respective dimensions of these zones are determined in such manner that, in operation, the injected current is channeled between parts of the device made dielectric by the creation of space charges.

Hyperfrequency device with gunn effect

A Gunn diode comprises deposited in succession on the active zone of gallium arsenide of type N: a first layer of the same material having the same type of conductivity but very strongly doped, and a second layer of amorphous germanium in which is developed a tunnel effect. A metallic deposit covering this second layer serves as cathode contact.

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Paris, France

Jean-Jacques Godart