The use of microplasma discharges as power-induced limiter elements in microstrip devices is proposed to protect receivers against high-power microwave threats. A microstrip bandpass filter integrating such a microplasma-based active microwave power limiter has been designed and measured. Power limitation is observed when the input power exceeds 19 dBm with a leakage power of 14 dBm. Due to the gaseous properties of the active medium, the proposed structure exhibits a very low additional insertion loss of 0.06 dB.

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Low insertion loss microplasma-based limiter integrated into a microstrip bandpass filter

References

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