Triple-band antenna with gaps which are loaded nested double R-shaped left-handed structures

Abstract

The invention discloses a triple-band antenna with gaps which are loaded nested double R-shaped left-handed structures, and relates to a triple-band antenna. The triple-band antenna is provided with a dielectric substrate. A rectangular patch is etched on the upper surface of the dielectric substrate, two loaded nested R shaped left-handed structures which are used as the gaps are loaded on a monopole antenna, feed effects can be realized by planar waveguides, and arcs are loaded on the left edge and the right edge of a floor. The triple-band antenna has the advantages that the shortcomings of narrow double-negative frequency bands, high loss and large sizes of existing microwave-band left-handed materials can be overcome by asymmetric left-handed material unit structures, and the asymmetric left-handed material unit structures can be applied to micro-strip antennas, are flexible and controllable in electric resonance and magnetic resonance frequency range, wide in left-handed characteristic bandwidth and low in loss and have special electromagnetic characteristics and simple left-handed characteristic regulation parameters as compared with symmetric left-handed materials owing to the asymmetry of the left-handed material unit structures in incident directions of electromagnetic waves.

Description

technical field [0001] The invention relates to a tri-band antenna, in particular to a tri-band antenna loaded with nested double R-shaped left-hand structural slots. Background technique [0002] As a kind of metamaterials, Left-handed Materials (Left-handed Materials) are also called Negative Index Metamaterials (Negative Index Metamaterials), Backward Wave Media (Backward Wave Media), Double Negative Metamaterials (Double Negative Metamaterials) in the electromagnetic wave Certain frequency bands exhibit a negative refractive index [1] . Left-handed materials consist of units that are much smaller than the wavelength, and these units are either stacked, or curved and formed in a special repeating pattern to form a unique material. The idea of ​​this material was first proposed by V.G. Veselago [2] , he assumed that there exists a material whose electric field, magnetic field and wave vector satisfy the left-handed spiral rule, and whose permittivity ε and magnetic perm...

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Problems solved by technology

[0005] However, a large part of the structural changes of left-handed materials currently working in the microwave frequency band come from the classic split resonator ring plus metal wire structure (SRR+Rod), such as the S-type structure [9] , Ω structure [10] , H-shaped structure [11] , branch structure [12] and fishnet structure [13] , mainly in a regular and symmetrical configuration. Generally, the double negative frequency band is narrow, the loss is large, and the size is too large. It is difficult to apply to microwave devices with special performance requirements and space constraints.

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