Square Plate Active Limiting Frequency Selective Surface at X-band

Limiters are commonly used in receivers to protect against high incident RF power levels. The power level input to the limiter is dependent on the system's antenna gain, so receiver protection is usually designed for a specific antenna. In this paper, receiver protection in the form of an active limiting frequency selective surface is proposed. This allows the receiver protection to be located before the antenna, making it independent of antenna performance. A design at X-band is presented and simulated.