While India’s Tejas Mk1A program will deploy Israeli EL/M-2052 (GaAs-based AESA radar) in the first 83 aircraft to ensure timely induction into the Indian Air Force, plans are underway to equip the remaining 97 jets with the more advanced indigenous Uttam GaN-based AESA radar. This phased transition allows India to avoid delays while simultaneously leapfrogging into next-generation radar technology that offers superior detection range, survivability, and electronic warfare capability.
Why India is Skipping Uttam GaAs for the First 83 Tejas Mk1A
India’s decision to equip the first batch of Tejas Mk1A fighters with the Israeli EL/M-2052 radar reflects a carefully balanced strategy between operational urgency and technological evolution. The Indian Air Force is currently facing squadron shortages, making timely induction of new aircraft a top priority. Any delay caused by integrating a still-maturing indigenous radar system could have had a cascading impact on force readiness.
At the same time, India’s indigenous Uttam AESA radar program has been progressing steadily under DRDO’s LRDE. However, earlier versions of the radar were based on Gallium Arsenide (GaAs) technology, which, while reliable, is increasingly being overtaken by Gallium Nitride (GaN) systems worldwide. Rather than induct an interim GaAs-based Uttam radar and later upgrade it, Indian planners have opted for a more forward-looking approach by skipping this intermediate step entirely.
This has resulted in a phased procurement strategy where the first 83 aircraft are equipped with a proven foreign radar to ensure immediate deployment, while the remaining 97 aircraft will feature a fully mature, next-generation GaN-based Uttam radar. This approach not only avoids redundancy but also ensures that a significant portion of the fleet enters service with cutting-edge capabilities from the outset.
GaAs vs GaN Radar: What’s the Real Difference?
The transition from GaAs to GaN radar technology represents a fundamental shift in how modern fighter radars are designed and operated. While GaAs-based AESA radars have formed the backbone of many air forces over the past two decades, they are now approaching the limits of their performance potential, especially in high-intensity electronic warfare environments.
Gallium Nitride, on the other hand, offers a substantial leap in efficiency and capability. One of the most important advantages of GaN is its ability to operate at higher voltages and temperatures without performance degradation. This directly translates into greater power output, which in turn enhances detection range and tracking capability. In practical combat scenarios, this means a fighter equipped with a GaN radar can detect and engage enemy aircraft earlier than one using older technology.
Another critical improvement lies in thermal management. Fighter radomes have limited space for cooling systems, and excessive heat generation can reduce radar efficiency over time. GaN’s superior heat resistance allows for more compact yet powerful radar arrays, enabling the integration of a higher number of transmit/receive modules—estimated to be around 900 or more in the Uttam configuration.
Additionally, GaN radars significantly improve electronic warfare resilience. Features such as Low Probability of Intercept (LPI) make it harder for adversaries to detect radar emissions, while advanced Electronic Counter-Countermeasures (ECCM) enhance resistance to jamming. Taken together, these advantages make GaN not just an incremental upgrade, but a transformative technology in aerial combat.
How GaN Radar Enhances Tejas Mk1A Combat Capability
The integration of the Uttam GaN AESA radar into later batches of the Tejas Mk1A will substantially elevate the aircraft’s combat performance, particularly in beyond-visual-range engagements and network-centric warfare scenarios. With increased detection range, pilots gain valuable additional seconds—or even minutes—to assess threats and make tactical decisions, which can be decisive in modern air combat.
Equally important is the radar’s ability to track multiple targets simultaneously with greater accuracy. In increasingly congested and contested airspaces, fighters must be capable of handling multiple threats at once, ranging from enemy aircraft to drones and even incoming missiles. The GaN-based Uttam radar enhances this capability, allowing Tejas Mk1A to operate more effectively in complex battle environments.
The improvements in ECCM and LPI further strengthen survivability. In a scenario where adversaries employ advanced jamming techniques, maintaining radar functionality becomes critical. GaN technology ensures that the radar remains operational even under electronic attack, while also reducing the aircraft’s own electromagnetic signature. This effectively gives the Tejas Mk1A a form of “electronic stealth,” even though it is not a stealth aircraft in the traditional sense.
Finally, the enhanced thermal efficiency of GaN radars makes them particularly suited for Indian operating conditions, where high ambient temperatures can otherwise impact system performance. This ensures consistent reliability across diverse mission profiles, from high-altitude patrols to desert operations.
Will the Radar Transition Delay Tejas Mk1A Deliveries?
A common concern surrounding such technological transitions is the potential for delays in aircraft delivery schedules. However, in the case of the Tejas Mk1A program, the phased radar strategy has been specifically designed to prevent such disruptions. By relying on the already operational EL/M-2052 radar for the first batch, India ensures that production and induction timelines remain on track.
At the same time, the development of the Uttam GaN radar continues independently, without interfering with current manufacturing processes. This parallel development model allows engineers to refine and fully validate the indigenous system before it is deployed on operational aircraft. As a result, when the second batch begins production, the GaN radar is expected to be mature, reliable, and ready for seamless integration.
The overall timeline reflects this balanced approach, with initial deliveries taking place between 2025 and 2028, followed by the introduction of GaN-equipped aircraft in the late 2020s and early 2030s. This ensures that the Indian Air Force does not have to choose between capability and availability—it gets both.
Future Outlook: Backbone for Tejas Mk2 and AMCA
The significance of the Uttam GaN radar extends far beyond the Tejas Mk1A program. It represents a critical building block for India’s future fighter aircraft, including the Tejas Mk2 and the Advanced Medium Combat Aircraft (AMCA). By developing and standardizing this technology domestically, India is laying the foundation for a unified radar ecosystem across multiple platforms.
This not only reduces long-term costs but also enhances interoperability and upgrade flexibility. Future improvements in GaN technology can be rolled out across different aircraft types without dependence on foreign suppliers. This aligns closely with the broader Atmanirbhar Bharat initiative, which aims to strengthen India’s defense industrial base and reduce import dependency.
Strategic Impact: A Dual-Track Approach to Air Power
Ultimately, India’s decision to adopt a phased radar transition reflects a sophisticated understanding of modern defense planning. Rather than committing entirely to either immediate induction or future technology, it successfully combines both objectives through a dual-track approach.
In the short term, the Indian Air Force benefits from the rapid induction of combat-ready aircraft equipped with proven systems. In the long term, it gains access to cutting-edge radar technology that will remain relevant in the evolving threat landscape of the 2030s and beyond.
This strategy also enhances India’s position in the global defense market. As more countries look for cost-effective yet technologically advanced fighter platforms, the Tejas Mk1A—especially with an indigenous GaN radar—becomes an increasingly attractive option.
