Miniaturized strip-line directional coupler package having spirally wound coupling lines

摘要: A strip-line directional coupler is provided in which the volumetric size reduced without a reduction electrical characteristics. The input and output coupling lines are wound into separate spirals each having same pitch so that they can be located at fixed distance with respect to one another sufficiently close along their entire length provide of an signal from line backwards direction. first second ground plane on either side small spirally line. dielectric material between planes lines. improved characteristics as enable spacing thereby further diminishing device small, flat package.