Etat Francais, Represente Par Le Ministre Des Ptt (centre National

Etablissement Public De Telediffusion Dit 'telediffusion De France'

Rene Le Dain

Henri Havot

A wide band directional coupler for microstrip lines has a microstrip line ection whose conductive core is coupled to the core of the main line over a length .lambda./4 (.lambda. being the wave length in a mid portion of the desired pass band). The section has a first fraction parallel to the main line and at a small distance therefrom so as to provide tight coupling and a second fraction diverging from the main line and closed on a matching impedance. The free end of the first fraction is connected to the load and has an extension projecting over a length less than .lambda./16 for forming a microcapacitor tapping energy from the main line.

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Cesson Sevigne, France

Rene Le Dain