About BAE Systems Electronic Systems BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services. RF circuit design experience - high frequency board stack-ups and trace routing (to 40 GHz), lumped element filter design, RF signal chain design (LNAs, mixers, LO/frequency generation, equalizer, filters, attenuators, switches).