Telediffusion De France

French State Represented by the Minister of Post, Telecommunications and

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

Etablissement Public De Telediffusion Dit 'telediffusion De France'

Henri Havot

Yvon Dutertre

Rene Le Dain

A filtering cell including a resonant circuit having an inductor and capacitor connected in parallel, the inductor being separated into two identical inductors which are connected in series with a midpoint therebetween. A second capacitor is connected at the midpoint and has a quality factor substantially equal to a quality factor of the first inductor, resulting in attenuation at the resonant frequency. Each of the inductors and capacitors are formed by micro-ribbon technology.

Filtering cell and corresponding filter

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.

Growing community of inventors

Cesson Sevigne, France

Henri Havot