Electromagnetic wave near field isolation screen and applications thereof

Abstract

The invention provides an electromagnetic wave near field isolation screen and applications thereof, and relates to a wireless radio frequency technology. The electromagnetic wave near field isolation screen is equipped with metamaterial units. The metamaterial units are arranged in a matrix manner. Two regions which are isolated with each other are formed at two sides of the electromagnetic wave near field isolation screen respectively. Each metamaterial unit is composed of at least a variable capacitance diode and at least a circuit component in series connection or in parallel connection. The circuit component is at least one selected from a resistor, an inductor, a capacitor and the like. All the metamaterial units are in the same plane, or can be moved in the same plane after rotation and translation in the matrix arrangement. The number of the transverse metamaterial units and the number of the vertical metamaterial units cannot be less than 3 at the same time in the matrix arrangement. The electromagnetic wave near field isolation screen can be used in a self-adaption near field isolation device and has high isolation. The electromagnetic wave near field isolation screen has an environment self-adaption capability, when an environment around a double-antenna system changes, the electromagnetic wave near field isolation screen can adapt to change of the environment automatically, and high isolation is achieved again. The electromagnetic wave near field isolation screen is advantaged by low cost, controllability and self-adaption.

Description

technical field [0001] The invention relates to radio frequency technology, in particular to an electromagnetic wave near-field isolation screen and its application. Background technique [0002] The existing common near-field antenna isolation methods are metal plate isolation or cross-polarization isolation, the latter is the use of orthogonal (for linear polarization) or reverse (for circular polarization) placed linearly polarized antenna surface The currents are orthogonal to each other, so they are isolated from each other without interfering with each other. This approach has been around since the 1970s [1] , to this day there are still many studies in this area. Judging from domestic and international research in the past two years, the generally achievable isolation is around 30-50dB [2-4] ; However, this method requires that the two polarization modes be orthogonal, which requires the communication system to have the same dual-polarization communication mechanis...

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Problems solved by technology

Judging from domestic and international research in the past two years, the generally achievable isolation is around 30-50dB [2-4] ; However, this method requires the two polarization modes to be orthogonal, which requires the communication system to have the same dual-polarization communication mechanism, thus limiting its scope of application

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