Plasma-discharge-integrated slot structure for microwave power limiter

Area of Science:

• Electromagnetics and Microwave Engineering
• Plasma Physics
• Applied Physics

Background:

• High-power microwaves pose a threat to sensitive electronic systems, particularly receivers in radio detection and ranging (RADAR) systems.
• Existing protection methods may have limitations in terms of insertion loss or blocking efficiency.

Purpose of the Study:

• To develop and demonstrate a novel plasma limiter capable of mitigating incident high-power microwaves.
• To optimize the design for low insertion loss at operational frequencies and high blocking efficiency against intense microwave signals.

Main Methods:

• Integration of a slot structure with a discharge electrode to facilitate plasma generation.
• Utilizing double-stage slot structures to achieve broad band-pass characteristics.
• Optimization of xenon gas pressure and electrode gap distance for efficient plasma discharge.

Main Results:

• The plasma limiter demonstrated a low insertion loss of 1.01 dB at the target frequency of 9.45 GHz for low-power signals.
• Upon high-power microwave input, xenon gas breakdown occurred, resulting in near-zero signal transmission.
• Achieved a blocking efficiency of 40.55 dB, effectively reflecting the majority of the high-power signal.

Conclusions:

• The proposed slot-structure-based plasma limiter effectively suppresses high-power microwaves.
• The device offers a promising solution for protecting RADAR receivers from potentially damaging microwave radiation.
• The design shows potential for integration into various microwave systems requiring robust protection.