Comparison of shared and separate antennas

Various factors influence the selection of shared antenna versus separate antennas for Wi-Fi® and Bluetooth® LE/IEEE 802.15.4 devices in a product.

Table 1. Comparison of shared and separate antennas
Criteria Shared antenna Separate antennas Remarks
Printed Circuit Board (PCB) area Lower Higher Shared antenna products need smaller PCB area.
Aggregate throughput Lower Higher Additional opportunities exist for concurrent 2.4 GHz Wi-Fi and Bluetooth LE/IEEE 802.15.4 operation with separate antennas.
RF performance Degraded Not degraded Insertion loss due to switch can result in marginal performance loss in Shared Antenna mode.
Support for IEEE 802.15.4 standard (Thread®/Zigbee®) Not supported Supported IEEE 802.15.4 standard devices need their RX to be ON all the time. Need to use solution for separate antennas.