Porous Silicon/Silicon Hybrid Substrate Applied to the Monolithic Integration of Common-Mode and Bandpass RF Filters

Abstract

In order to develop high performances and miniaturized devices for RF communications, monolithic integration becomes an important challenge for microelectronics industries. Bandpass filters and common-mode filter have been integrated on 6-in porous silicon (PS)/silicon hybrid substrates with PS regions under passive devices. An improvement of the rejection level on common mode was demonstrated on PS regards to low-resistivity silicon. Furthermore, the bandwidth differential was increased regards to bulk silicon and, thus, allows the development of devices for high-speed communications systems.