Home » Microwave Band-pass Filter and Passive Devices Using Copper Metal Process on Al2O3 Substrate Microwave Band-pass Filter and Passive Devices Using Copper Metal Process on Al2O3 Substrate January 25, 2008 Chia Song Wu, Hsien-Chin Chiu, Yi-Feng Lin 0 Comments Jump to Page: You must login or register in order to post a comment. Report Abusive Comment Thank you for helping us to improve our forums. Is this comment offensive? Please tell us why.