High-power automatic protection circuit based on MEMS micro cantilever beam and graphene CPW transmission line

Abstract

The invention discloses a high-power automatic protection circuit based on an MEMS micro-cantilever and a graphene CPW transmission line, a graphene layer is arranged between a CPW center signal line and a ground line, the MEMS micro-cantilever couples out a part of signals on the transmission line and generates a control signal according to the coupling power, the control signal is loaded to the graphene layer, and according to the electrical modulation characteristics of the graphene, the control signal can change the chemical potential and conductivity of the graphene layer, thereby changing the transmission characteristics of the CPW transmission line. When the input power is smaller than a safety threshold value, the chemical potential of graphene is zero, the conductivity is very small, signals can be transmitted normally, and the transmission loss is small; and when the input power exceeds a safety threshold value, the control signal is increased, and the chemical potential and the conductivity of the graphene are increased, so that the transmission characteristic of the CPW transmission line is changed, the output signal is greatly attenuated, and a subsequent circuit is automatically protected. The invention has the advantages of low transmission loss in a low-power state, difficulty in breakdown under a high-power condition, high reliability, capability of performing self-adaptive protection according to the magnitude of input power and the like.

Description

technical field [0001] The invention belongs to the field of microelectronics, in particular to a high-power automatic protection circuit based on a MEMS micro-cantilever beam and a graphene CPW transmission line. Background technique [0002] The electromagnetic pulse energy emitted by the microwave transmitter will enter the system through the receiving equipment such as the antenna on the electronic system, causing serious interference, disruption or even damage, especially the electromagnetic pulse coupled into the radio frequency channel through the antenna will damage sensitive devices. Therefore, it is very important to set up a high-power protection circuit at the back end of the receiving antenna to suppress the electromagnetic pulse voltage or current entering the electronic system, and to protect sensitive modules in the circuit from damage. The main method currently used for high-power protection is microwave solid-state reinforcement technology, which reduces th...

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Problems solved by technology

This microwave solid-state reinforcement technology has disadvantages such as large insertion loss, easy breakdown under high power conditions, and inability to perform adaptive protection according to the input power.

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