Review—Goodenough-Kanamori-Anderson Rules-Based Design of Modern Radio-Frequency Magnetoceramics for 5G Advanced Functionality

5th generation (5G) wireless technologies promise a transition from 4G 2.3 GHz to Ka-band (i.e., 28–33 GHz) frequencies and the promise of revolutionary increases in data handling capacity and transfer rates at greatly reduced latency, among other benefits. A key enabling 5G technology is the development of massive multiple input—multiple output (m-MIMO) antenna arrays where array elements simultaneously transmit and receive (STAR) data providing true full duplexing in time and frequency domains. Small cells, i.e., mobile and stationary base stations used to supplement existing 4G network infrastructure to boost signals in dense urban environments, will provide coverage over smaller areas to efficiently transmit signals over the millimeter wave spectrum. In order to realize these extraordinary advances, key materials must be developed, chief among them RF magnetoceramics. Here, we describe application of the long-standing Goodenough-Kanamori-Anderson rules for superexchange as guiding principles in the design of next generation magnetoceramics to meet the challenges of 5G wireless communication technologies and their timely implementation.