| 摘要 |
<p>An hermetically sealed integrated microwave circuit comprising a coplanar waveguide on a PCB (3, 4) electrically connected on one major surface to an IC, and thermally and electrically connected to a BGA (5) on its opposite major surface, in which the PCB has at least first and second printed layers, a microwave signal path extends from a ball of the BGA through a through-hole in both printed layers to the coplanar wave guide, and plural ground paths extend from balls (51) of the BGA (5) through first through-holes in the first printed layer of the PCB and through second through-holes of the second printed layer of the PCB, the first and second through-holes being non-coincident, to allow for an hermetic seal across the PCB whilst introducing a predetermined impedance in the PCB between the signal and ground paths.</p> |
