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A highly directional terahertz circulator based on zero-refractive-index metamaterials

A zero-refractive index, metamaterial technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problems of high loss, large return loss, and low application frequency band of circulators, achieve the degree of orientation, improve the circulator Performance, highly directional effects

Active Publication Date: 2020-07-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies of circulators such as high loss, large volume, low application frequency band, and excessive return loss in the prior art, the present invention provides a highly directional terahertz circulator based on zero-refractive index metamaterials

Method used

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  • A highly directional terahertz circulator based on zero-refractive-index metamaterials
  • A highly directional terahertz circulator based on zero-refractive-index metamaterials
  • A highly directional terahertz circulator based on zero-refractive-index metamaterials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] To further illustrate the effect of the device structure, as a preference, the cube structure 1 has a length b of 800um and a width a of 400um in the horizontal section of the circulator, and three cube structures have an included angle of 120° in the horizontal section of the circulator. Place and set the circulator. The height of the zero-refraction metamaterial medium cubic structure 1 is along the z-axis, which has no effect on the performance of the circulator, and it is set to 5um here.

[0025] Use the knowledge of electromagnetic environment to simulate and design to get its work like figure 2 :

[0026] The plane wave is incident from port 1, the circulator is transmitted in a one-way loop, and is emitted from port 2, while port 3 is isolated. The plane wave is incident from port 2, and the circulator circulates in one direction, and is emitted from port 3, while port 1 is isolated. The plane wave is incident from port 3, and the circulator is transmitted in a on...

Embodiment 2

[0028] In order to further illustrate the effect of the device structure, combined with relevant knowledge, set up electric field, magnetic field and power monitors in the simulation respectively, as image 3 , Figure 4 with Figure 5 As shown, take the plane wave incident from port 1 as an example to monitor the internal energy distribution and change state of the circulator when it works in the 0.1-10THz frequency band.

[0029] When the refractive index is in an ideal state and the frequency is 1.2THz, that is, when the real and imaginary parts of the refractive index are both 0, the electric field energy of the plane wave incident is 1v / m, incident from the 1 port, the circulator works, and the incident wave is in the circulator In the inner unidirectional loop, almost all incident waves are emitted from the 2-port, the 2-port electric field energy is about 0.91v / m (-1.68dB), and the 3-port direction is isolated. The energy at the 3-port is about 0.2v / m (- 15.5dB), the direc...

Embodiment 3

[0031] To further illustrate the effect of the device structure, as a comparison, we change the real part n'imaginary part n" of the refractive index of the zero-refractive material, and monitor the energy change around the above-mentioned working frequency band. The other structures, dimensions and materials are exactly the same as the above examples.

[0032] When the frequency is 1.195THz, the real part n'of the refractive index is 0.0072, and the imaginary part n" is 0.0015, the electric field energy of the plane wave incident is 1v / m, incident from the 1 port, the circulator works, and the incident wave is single in the circulator. Circling around, almost all incident waves are emitted from the 2-port, the 2-port electric field energy is about 0.92v / m (-1.67dB), while the 3-port direction is isolated, the energy at the 3-port is about 0.23v / m (-14.69dB) ), the orientation degree is 6.07, the orientation degree changes very little, and the circulator performance is basically u...

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Abstract

The invention provides a high-orientation terahertz circulator based on a zero-refraction index supermaterial. The circulator includes three cube structures consisting of zero-refraction index supermaterial mediums disposed in the circulator, wherein the three cube structures are arranged in a Y-shaped structure, an outwardly facing angle between every two cube structures corresponds to a port enclosed by a metal casing, the metal casing is filled with the air, a triangle is formed in the middle of the Y-shaped structure by the three cube structures, and a triangular metal casing is arranged in the triangle. The circulator is advantaged in that the ingenious structure is achieved, the zero-refraction index supermaterial is applied to circulator design, the overall design is made to be in micron size, electromagnetic waves are incident from any angle, unidirectionally looped and reversely isolated, through adding the supermaterial, the refraction index is zero, the zero-refraction indexmaterial property is fully utilized to improve circulator performance, the circulator is made to be suitable for the terahertz band, and the high orientation degree is achieved.

Description

Technical field [0001] The invention relates to the field of terahertz solid-state devices, in particular to a new type of terahertz circulator based on zero-refractive materials in terahertz multiplex communications and modern radars. Background technique [0002] Ring coupler is a kind of directional coupler, which is widely used in microwave system and millimeter wave field. The circulator is a multi-port passive device, in which electromagnetic wave transmission can only circulate in one direction, and the opposite direction is isolated. At present, it has an important position in microwave communication. It is often used as the basic system component of microwave communication or electronic devices, and is used in the design circuit of phase shifters, counters, power amplifiers and other components. Generally, the orientation or isolation is introduced according to the energy value of each port to show performance. [0003] In recent years, with the breakthrough of terahertz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/383H01P1/387
CPCH01P1/383H01P1/387
Inventor 侯志灵薛伟马俊文
Owner BEIJING UNIV OF CHEM TECH
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