Full RF module with embedded filters for 2.4 GHz and 5 GHz dual band WLAN applications

Small size radio frequency (RF) multi chip module for dual band (2.4 GHz and 5 GHz) wireless local area network (WLAN) applications is described. The full functions between base band input/output (I/O) and RF antenna switch are integrated in the RF module. In order to reduce size of the RF module, embedded 5 GHz band pass filter (BPF), build-up multi-layer organic substrate and flip chip technology are used. Size of the RF module is 24 mm/spl times/32 mm/spl times/2.1 mm, including shield cover and connectors. This is the minimum size in modules with same functions for dual band WLAN as far as the authors know. And electrical performances of the RF module are evaluated using WLAN signals. This report presents design and experimental results of small size RF module for dual band WLAN applications.