A more-typical structure includes four rigid layers with two flex layers. Table 1 represents an even-layered, symmetrical stack-up that can support impedance-controlled traces. FR4 is the commonly ...

FR4 is way less expensive than high-frequency material due to many reasons and one of them is because not every PCB material manufacturing company creates high-frequency material.

Imbera recently announced the IMB (integrated-module-board) packaging technology, which uses conventional PCB (printed-circuit-board) materials, such as FR4, but embeds within the board many of the ...