Graphene-Based Magnetically Tunable Faraday Isolators

Abstract

The invention relates to a graphene-based magnetic adjustable Faraday type isolator. The structure comprises an input portion, an output portion, a circular waveguide applied to a microwave frequency range, a multilayer graphene module vertical to a microwave signal propagation direction in the circular waveguide, and a solenoid module sleeving the circular waveguide for providing magnetic field offset. The multilayer graphene module is composed of multiple single-layer graphene sheets in parallel arrangement inside the module. The solenoid module can control the strength of an externally added bias static magnetic field through controlling the size of currents. Since the isolation of the isolator is smaller than -30 dB in a working frequency range, the isolator is provided with good isolation performance. The isolation direction can be changed through changing the direction of the currents flowing into a solenoid. The Faraday type isolator also has the advantages of simple and compact structure, quite small size, easy integration, simple control, and convenient use.

Description

technical field [0001] The invention belongs to a Faraday type isolator used in the field of microwave technology, in particular to a new material graphene. Background technique [0002] In a microwave system, an isolator can also be called a one-way device. As the name implies, the electromagnetic wave can only propagate in one direction in this device, and its attenuation is small when it propagates in the forward direction, and attenuates when it propagates in the reverse direction of the isolator. Larger, the use of isolators can achieve unidirectional transmission of signals. The Faraday isolator refers to the use of the Faraday rotation effect of some special materials to make the isolator. In the traditional technology, the isolator is generally made of the rotation of the polarization plane when the electromagnetic wave propagates in the longitudinally magnetized ferrite rod. For some transmission systems that are extremely sensitive to return waves, such as radar e...

AI Technical Summary

Problems solved by technology

With the high integration and micro-scaling of electronic devices, the transport behavior of electrons no longer has macroscopic statistical properties, quantum effects begin to appear, and carrier fluctuations and quantum phase transitions will dominate. Therefore, traditional microelectronic devices will face big challenges

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