Optimizing Wireless BMS Communication With Multilayer Broadband Antenna Technology

This paper presents a novel antenna and its module designed for a wireless Battery Management System (wBMS). The proposed antenna module is mounted on the main printed circuit board (PCB) using surface mount technology (SMT) and enclosed within a mechanical cover case. The antenna features a coupled feeding mechanism with two radiating elements, implemented both on the surface and within the substrate layers to ensure optimal performance in the battery pack structure. This multilayer antenna provides a bandwidth exceeding 400 MHz, with an average path loss of 46.95 dB between the Battery Management Unit (BMU) and multiple nodes, even under external noise conditions of 30 dB and in the presence of coolant. Additionally, the system achieved a Packet Delivery Ratio (PDR) of 100% with a bridge network and 96% without, confirming the antenna's stable performance throughout the system.