A multi-layer circuit structure including a plurality of substrate layers. At least one planar transmission line, including microstrip, stripline, or coplanar line, disposed on the plurality of substrate layers. A via transmission line connected to that at least one planar transmission line and...http://www.google.fr/patents/US5757252?utm_source=gb-gplus-shareBrevet US5757252 - Wide frequency band transition between via RF transmission lines and planar transmission lines
Wide frequency band transition between via RF transmission lines and planar ...
