Patent ID: 6072375
Filing Date: 2000-06-06
Classification: H01P,H05K

Abstract:
A waveguide structure comprising:at least two dielectric layers having opposing, substantially outer planar faces and an intermediate signal path layer positioned between said faces;a conductive layer disposed on each of said opposing, substantially planar outer faces to define outer ground planes;at least one controlled impedance signal track disposed within the waveguide structure at the intermediate signal path layer;a plurality of conductive vias interconnecting said ground planes on either side of said at least one controlled impedance signal track and extending through respective ones of said at least two dielectric layers and said plurality of conductive vias being arranged in a grid pattern on either side of said controlled impedance signal track; anda plurality of grounding lines interconnecting said vias at said intermediate signal path layer, wherein any one conductive via is connected to all adjacent conductive vias outside said controlled impedance signal track to define an inner grounding line grid that is coplanar with said controlled impedance signal track to work in conjunction with said plurality of conductive vias for waveguide mode rejection.