GaN MMICs: DRDO's Indigenous Chips for Radars and Electronic Warfare

Understanding the name, one part at a time

Gallium nitride, abbreviated as GaN, is a semiconductor compound of gallium and nitrogen. A semiconductor allows electrical current to be controlled, making it useful for devices such as transistors. The material is only one part of the technology. Engineers must also design the devices, connect them into circuits and provide manufacturing processes that reproduce the design reliably.

A monolithic microwave integrated circuit, or MMIC, places connected circuit elements on a single semiconductor chip. “Monolithic” refers to that integrated construction. “Microwave” identifies the high-frequency radio signals the circuit handles. These circuits amplify, switch or otherwise control signals. Integration can make a radio module compact, but its performance still depends on its design and operating conditions.

What the circuit does inside a radar

A radar sends out radio waves and receives reflections from objects. Its transmitting side needs a power amplifier to strengthen the outgoing signal. The returning echo can be much weaker, so the receiving side needs amplification that introduces little additional electrical noise. Switches help direct signals between different paths. These functions have different requirements even when they use the same semiconductor material.

The laboratory’s technology-transfer document covers power amplifiers, low-noise amplifiers and switches operating in frequency bands up to the X band. It also describes high-electron-mobility transistors for radio-frequency applications. The term “radio frequency” refers to electrical signals used for wireless transmission and reception. None of these specifications means that the chip performs every computing or signal-analysis task in a radar.

Why gallium nitride is useful

GaN is a wide-bandgap semiconductor. The bandgap is the energy separation that electrons must cross to participate in electrical conduction. Its comparatively large value helps devices operate under demanding electrical conditions. The United States Department of Energy identifies higher-voltage, higher-temperature and higher-frequency operation as important possibilities of wide-bandgap materials compared with conventional silicon devices.

For radio equipment, these properties can support greater power from compact components and reduce some energy losses. However, a material advantage is not a fixed multiplier for every finished circuit. Power, efficiency, frequency and operating temperature must be measured under specified conditions. A broad claim that one material is hundreds of times “faster” cannot substitute for those separate engineering measurements.

Heat also remains important. A high-power component still needs a path for heat to leave the active device. The Indian technology uses gallium nitride on silicon carbide, a different material used as the supporting substrate. Packaging, electrical connections and cooling must work together with the semiconductor. Tolerating demanding conditions does not make the finished module immune to overheating or failure.

Development, production and deployment are different stages

A Defence Ministry release in November 2024 described devices made on four-inch silicon-carbide wafers. It reported GaN transistors up to 150 watts and microwave integrated circuits up to 40 watts. It also identified limited production at the Gallium Arsenide Enabling Technology Centre in Hyderabad. These figures concern different device categories; they are not interchangeable ratings for every chip.

The later technology-transfer offer describes a route for industry to take up the laboratory’s processes and designs. Moving from successful devices to dependable production requires control over material quality and manufacturing variation. Finished components must then satisfy the requirements of the systems using them. A demonstrated fabrication capability is therefore valuable without being proof that every operational radar already contains it.

Why domestic capability matters

Access to an indigenous design and manufacturing process can give equipment developers greater control over a critical component. It can also make changes and replacement planning less dependent on an outside supplier. These are potential strategic advantages, not evidence that every upstream material or production tool is domestic. The supply chain must be examined separately from the chip’s design origin.

The broader challenge is industrial consistency. A useful production process must deliver devices that behave predictably, not just a few successful samples. The Department of Energy’s assessment highlights material quality, substrate cost, packaging and system integration as continuing challenges. These practical requirements explain why laboratory achievements, technology transfer and reliable large-scale manufacture should be reported distinctly.

Conclusion

India’s GaN work strengthens an important foundation for advanced radio equipment. Its significance lies in the ability to design and make specialised high-power circuits, not in an undefined speed comparison with ordinary chips. The next measure of progress is reliable production and demonstrated performance within complete systems. That is how a promising semiconductor capability becomes dependable operational technology.