Alcatel

Alcatel Telspace

Alcatel Thomson Faisceaux Hertziens

Maurice Bernaud

Mustafa Gurcan

Jean-Pierre Lemonnier

Freddy Maquet

To make a variable phase shifter at low cost and that is easy to manufacture, two propagation paths for a high frequency signal are provided in parallel between the input and the output of the phase shifter. These two paths are of different lengths. An intermediate node on one of the paths is connected to an intermediate node on the other path by a PIN diode. The diode is connected to the paths by a segment of line further enhancing the length difference. By biasing the diode to a desired level, it is caused to present a particular impedance to propagation. It is shown that by acting in this way the diode can vary the phase shift between the input and the output without needing to use harmful reactive components.

High frequency circuit with variable phase shift

An electronic circuit is implemented on a substrate on an electrically conductive bottom plate fixed into an electromagnetic shield box. A coaxial socket is fixed to an outside wall of the shield box, the core of the socket being inserted in a hole in the wall in order to be connected to the electronic circuit. The socket has a grounding surface facing the wall. The grounding contact between the socket and the bottom plate is made by way of an electrically conductive ring coaxial with the core, insulated from the core and simultaneously in electrical contact with the grounding surface of the socket and the bottom plate when the socket is fixed to the wall of the box.

Electrical ground connection between a coaxial connector and a microwave

A tuneable microwave filter comprises two branches of the same type each of which is connected to ground (22, 24) at each end and each of which includes a series-connected variable capacitance diode (13, 13A) controlled by a D.C. signal (V), said filter being disposed on the first face (9) of a plane substrate (8), with each branch comprising in series:

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Asnieres, France

Maurice Bernaud