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Active limiting frequency selective surface at X-band
Bay, Patrick
Bay, Patrick
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2020
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Abstract
Receivers used in wireless communication systems will commonly employ limiters to protect sensitive low-noise electronics from high-power emitters that may be located nearby. Receivers may be designed to operate with signals in the nanowatt (10-9 W) range, while nearby transmitters may be broadcasting hundreds or thousands of Watts of power. The disadvantage of traditional receiver limiters are that they are located downstream from the antenna, which will commonly have gain and increase the amount of power that the limiter must handle. A frequency selective surface with integrated limiter protection is proposed to mitigate this issue by moving the limiting function before the antenna, and this type of receiver protection has had minimal investigation in the existing literature. A new design operating at X-band is proposed using a square-plate element, and is simulated and measured for both small-signal and large-signal conditions. The measurements show that the concept is capable of non-linear limiting behavior with insertion loss comparable to the traditional microstrip limiter approach.
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