US Patent 10998272 Organic interposers for integrated circuit packages

An electronic interposer may be formed using organic material layers, while allowing for the fabrication of high density interconnects within the electronic interposer without the use of embedded silicon bridges. This is achieved by forming the electronic interposer in three sections, i.e. an upper section, a lower section and a middle section. The middle section may be formed between the upper section and the lower section, wherein a thickness of each layer of the middle section is thinner than a thickness of any of the layers of the upper section and the lower section, and wherein conductive routes within the middle section have a higher density than conductive routes within the upper section and the lower section.