India, Japan Co-Develop Stealth Naval Radio Antenna Based on UNICORN

India and Japan have signed an agreement to jointly develop a stealth naval radio antenna system built around the UNICORN platform, further strengthening defence technology cooperation between the two Quad partners. The initiative is expected to enhance secure naval communications while supporting future maritime operations across the Indo-Pacific.

The UNICORN platform is an advanced integrated antenna technology designed to reduce a warship’s electromagnetic and radar signature without compromising communication performance. By combining multiple communication functions within a compact structure, the system helps modern naval vessels maintain operational connectivity while lowering their detectability in contested environments.

The collaborative programme will combine Japan’s expertise in advanced antenna engineering and compact electronic systems with India’s expanding capabilities in naval integration, indigenous defence manufacturing, and warship design. The project also supports ongoing efforts by both nations to develop next-generation maritime technologies through joint research and industrial cooperation.

For the Indian Navy, the new antenna system could significantly improve communications on frontline warships while complementing existing electronic warfare and combat management systems. It is expected to be relevant for current and future platforms, including Kolkata-class destroyers, Nilgiri-class frigates, and upcoming naval programmes focused on network-centric warfare.

The initiative reflects the steady growth of the India-Japan strategic partnership, particularly in defence and maritime security. Over the past decade, the two countries have expanded cooperation through regular naval exercises, technology exchanges, and increased collaboration under the Quad framework to promote a secure and stable Indo-Pacific.

The project is also aligned with India’s defence indigenisation objectives under the Defence Acquisition Procedure (DAP) 2020, which encourages co-development and co-production of advanced military technologies with trusted international partners. Indian defence research organisations are expected to play a key role in system integration, testing, and future deployment.

Beyond surface combatants, the technology has the potential to support submarine communications and coastal surveillance networks, where reducing electromagnetic emissions is increasingly important for operational survivability. As electronic warfare continues to evolve, resilient and low-observable communication systems are becoming a critical component of modern naval capabilities.

This joint development programme highlights the growing emphasis India and Japan are placing on advanced defence technologies to strengthen maritime readiness and improve interoperability in the Indo-Pacific region.