Convolute dielectric without external magnetic field constructed by active artificial dielectrics

Abstract

The invention discloses a convolute dielectric without an external magnetic field constructed by active artificial dielectric units. A front dielectric slab and a back dielectric slab are parallel to each other and are respectively provided with four groups of orthogonal dipoles arranged in shape of a square; a group of left upper dipoles and a group of right lower dipoles at the same positions on the front dielectric slab and the back dielectric slab respectively rotate 90 DEG clockwise through an amplifier and then are correspondingly connected, the amplifier takes the dipoles of the front dielectric slab as input and the dipoles of the back dielectric slab as output to form a one-way left-rotation structure; a group of right upper dipoles and a group of left lower dipoles at the same positions on the front dielectric slab and the back dielectric slab respectively rotate 90 DEG clockwise through an amplifier and then are correspondingly connected, the amplifier takes the dipoles of the back dielectric slab as input and the dipoles of the front dielectric slab as output to form a one-way right-rotation structure; and the structures are periodically extended outwards to form an integral convolute dielectric with a nonreciprocal transmission characteristic. According to the convolute dielectric disclosed by the invention, the nonreciprocal transmission of any linearly polarized electromagnetic wave is realized by virtue of the one-way transmission characteristic of the amplifier, and the convolute dielectric can work only in need of direct current.

Description

technical field [0001] The invention relates to a non-reciprocal artificial medium, in particular to a gyrating medium constructed by using an active artificial medium without an external magnetic field. Background technique [0002] Convoluted medium is a special electromagnetic medium with non-reciprocal transmission characteristics. When electromagnetic waves propagate in most other media, whether they are isotropic, uniaxial media, or chiral media, they all have the symmetry of propagation, that is, the symmetry of electromagnetic waves. The transmission characteristics are not related to whether the direction of electromagnetic wave propagation is forward or reverse, which satisfies the reciprocity theorem. However, when propagating in a gyrating medium, the transmission of electromagnetic waves does not satisfy the non-reciprocity theorem, and the electromagnetic waves propagating in the opposite direction have non-reciprocal transmission characteristics with different...

AI Technical Summary

Problems solved by technology

Both require an external magnetic field, and if the same electromagnetic characteristics are to be achieved in a larger gyrating medium, a large-scale uniform magnetic field needs to be provided, which is not easy to process and carry

Because the plasma is not easy to control, the existing applications are mostly realized by ferromagnetic materials, and the operating frequency of ferromagnetic materials is low, and the non-reciprocal characteristics are not obvious in the design above 4GHz, thus limiting the higher frequency non-reciprocal electromagnetic device design

Images