Patent ID: 7196274

Claim:
A multi-layered integrated RF/IF circuit board including a high radio frequency (RF) portion and a lower intermediate frequency (IF) portion, the board comprising: a core with a first inner conductive layer on a first surface of the core and a second inner conductive layer on a second surface of the core opposite to the first surface; a first inner non-conductive layer on the first inner conductive layer and a second inner non-conductive layer on the second inner conductive layer; a first outer conductive layer on the first inner non-conductive layer and a second outer conductive layer on the second inner non-conductive layer; a first outer non-conductive layer on the first outer conductive layer and a second outer non-conductive layer on the second outer conductive layer, the first outer non-conductive layer being of a same material as the first inner non-conductive layer; and a first outer-most conductive layer on the first outer non-conductive layer and a second outer-most conductive layer on the second outer non-conductive layer, wherein the first outer conductive layer underneath the lower intermediate frequency (IF) portion of the board is etched away such that the first outer non-conductive layer and the first inner non-conductive layer touch one another and form a single substrate underneath the lower intermediate frequency (IF) portion of the board due to the first outer non-conductive layer and the first inner non-conductive layer being of the same material.