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A high power RF amplifier boosts low‑level signals to levels suitable for long‑range transmission, material processing, or electromagnetic compatibility (EMC) testing. These amplifiers are designed to deliver watts to kilowatts across frequency bands from HF through microwave. Key requirements include high linearity to minimise distortion, thermal efficiency to manage heat, and rugged construction for continuous or pulsed operation. Applications span across defence communications, industrial heating, scientific research, and broadcast transmission.
Unlike small‑signal or driver amplifiers, a high power amplifier (HPA) is optimised for maximum output power while preserving signal fidelity. HPAs operate closer to their compression point, so design trade‑offs between efficiency, linearity, and thermal management become critical. Typical architectures use GaN or LDMOS transistors for high power density, often combined with circulators to protect against load mismatches. Cooling methods range from forced air to liquid, depending on duty cycle and power level.
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