Transmission line coupler for ribbon and coplanar lines - is formed on one dielectric plate and is extension of coplanar line on one face electrically coupled to ribbon line earth plane

摘要

A transition device for coupling coplanar and parallel ribbon transmission lines comprises a dielectric substrate plate (9) having base conductor (10) of preset width dispersed on the earth plane of the ribbon line on one face of the plate and a ribbon conductor (11) of the same line on the opposite face, both having a common longitudinal axis (DELTA). The coplanar line is also on the opposite face and comprises a central ribbon conductor (12) on the common axis (DELTA) and two earth plane lateral conductor zones (13, 14) parallel to the central conductor. The coplamor line is coupled to the ribbon line by a central transmission line of a central conductor (15) linking the ribbon line conductor and coplanar central conductor and lateral earth bands (16, 17) connected to the coplamor earth bands (13, 14). The central transmission line electrically couples with a base conductor (22) in the plane of and connected with the base conductor (10) of the ribbon line, the degree of overlap between the former base conductor and the central line central conductor determining the degree of coupling.