Patent ID: 8033039

Claim:
A high frequency flip chip package process of a polymer substrate, comprising: depositing a first predetermined thickness of titanium onto a polymer substrate as an adhesion layer, and depositing a second predetermined thickness of gold onto the adhesion layer as a seed layer, and coating a third predetermined thickness of photoresist layer, and post-exposure baking the photoresist, and then reacting the polymer substrate with a developer solution and submerging the polymer substrate in an electroplating solution while connecting the polymer substrate with a current to form a coplanar waveguide transmission line; coating another photoresist on the coplanar waveguide transmission line to form a gold bump, and electroplating the gold bump by an electroplating solution to form at least one bump; using a solution to remove the photoresist and the seed layer; adhere a chip onto the bump; heating the polymer substrate, and filling in a under-fill into a space formed between the chip and the polymer substrate and the bump; and heating the polymer substrate, while sealing the top of the chip to complete the high frequency flip chip package process.