Shaping Modern Warfare: The Strategic Role of High-Power Microwave Directed Energy Weapons in Multi-Domain Operations

This structured narrative review analyses how High-Power Microwave (HPM) Directed Energy Weapons (DEWs) may shape modern warfare as militaries move from Network-Centric Operations (NCO) toward Multi-Domain Operations (MDO). It draws on peer-reviewed technical literature, official doctrinal publications, and open-source experimental reports to synthesise current knowledge on HPM sources, antennas, power and frequency regimes, propagation and coupling mechanisms, and typical engagement geometries across land, sea, air, space, and cyberspace. The paper compares HPM DEWs with high-energy laser (HEL) systems along key parameters such as lethality against electronics, range and beam control, platform integration, logistics, atmospheric sensitivity, and cost, and highlights their complementary roles in counter-drone, anti-infrastructure, and integrated air and missile defence missions. Within an MDO framework, the review examines how AI-enabled sensing, targeting, and command and control can enhance HPM effectiveness, resilience, and responsiveness, while also creating new vulnerabilities and escalation risks in the electromagnetic spectrum. It assesses technical and operational challenges such as environmental attenuation, adversary hardening and countermeasures, power generation and thermal management, and integration into legacy force structures, together with emerging solutions including modular architectures and multimodal kill chains. The review identifies key research gaps in the modelling and testing of complex targets, the standardisation of effects metrics, battle damage assessment, and the integration of quantum-secure communications and advanced sensing. It also outlines ethical and legal considerations under existing international humanitarian law and space-related treaties, and stresses the need for robust governance and ethical vigilance if the full potential of HPM DEWs is to be realised for global security and stability.