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Planar waveguide type hyperbolic metamaterial and ultra-small resonant cavity

A slab waveguide and metamaterial technology, applied in waveguide devices, resonators, electrical components, etc., can solve problems such as lack of adjustability

Inactive Publication Date: 2020-10-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From terahertz to microwave to radio frequency, although the method of metal wire array / dielectric matrix can still realize hyperbolic metamaterials, but because metal is approximately an ideal electrical conductor, the shape of the equal frequency curve will basically not change with the proportion of metal or frequency. change, lack of adjustability

Method used

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  • Planar waveguide type hyperbolic metamaterial and ultra-small resonant cavity
  • Planar waveguide type hyperbolic metamaterial and ultra-small resonant cavity
  • Planar waveguide type hyperbolic metamaterial and ultra-small resonant cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Set the operating frequency to 5GHz, and the relative permittivity of the two dielectric sheets are ε b1 =38.5 (barium tetratitanate ceramics) and ε b2 =2.31 (paper), the corresponding material losses are tanδ 1 =1.24×10 -4 and tanδ 2 =0, the metal plate is copper (σ Cu =5.7×10 7 S / m), the wire is silver (σ Ag =6.3×10 7 S / m). The geometric parameters are h=7.50mm, d 1 = d 2 = 1 mm, p x = 1 mm, d x = 0.2mm, d y = 0.02mm. in TE 10 mode, the equivalent permittivity of the two waveguides are ε wg1 =22.52+0.0049i, ε wg2 = -13.67 and ε whm,x =4.43+0.0025i, ε whm,y =-69.53+0.023i. It can be judged that the designed waveguide metamaterial is a hyperbolic metamaterial. Scan k with COMSOL x from 0 to π / p x 、k y from 0 to π / p y , extract the k corresponding to the frequency 5GHz x 、k y value and Q value. Income k tot with Q values ​​such as image 3 As shown, k tot Can reach 21.5k 0 , while Q>200.

[0037] If the waveguide height is changed while mai...

Embodiment 2

[0039] Keeping other geometric parameters unchanged, increasing the waveguide height h to 60mm, the working frequency of the waveguide hyperbolic metamaterial will move to low frequency. Then do truncation in the plane, take three metal line periods in the x direction, L x = 3mm; take two pieces of barium tetratitanate ceramics and one piece of anorthite ceramics in the y direction (ε b2 =5.5, tanδ 2 =1.24×10 -4 ), L y = 3mm. The physical picture of the resulting resonant cavity is shown in Figure 6 As shown, the schematic diagram of the xy section is shown in Figure 7 shown.

[0040] Place the resonant cavity on a metal plate (0.1 mm from the resonant cavity to the metal plate, and the metal plate is parallel to the dielectric sheet), and use a linear electric small antenna for near-field excitation. The measured reflected signal (S 11 )Such as Figure 8 shown. The resonant cavity supports multiple modes, and the resonant mode (1, 1) is on the middle plane of the h...

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Abstract

The invention discloses a planar waveguide type hyperbolic metamaterial and an ultra-small resonant cavity. A planar waveguide is formed by two metal plates in the height direction, two kinds of dielectric sheets are alternately and periodically arranged in the planar waveguide, the dielectric sheets are uniform sheets with sub-wavelength thicknesses, the height of the dielectric sheets is the same with that of the planar waveguide, and a metal wire array is arranged on interfaces of the adjacent dielectric sheets and used for restraining mode coupling. The planar waveguide works in a TE modeand can be homogenized into a waveguide type metamaterial, an equal-frequency curve is a hyperbolic curve, and a large wave vector which is more than ten times that of a free space wave vector is supported; the shape of the equal-frequency curve can be adjusted through matching of geometrical parameters and dielectric constants of dielectric materials, and different opening directions are achieved; and the metalmaterial is suitable for all frequency bands from terahertz to microwaves to radio frequency and optical frequency bands. The metamaterial is low in loss, supports large wave vectors,is flexible and adjustable in equal-frequency curve, and is convenient to integrate in a waveguide loop. The ultra-small resonant cavity is realized by adopting the waveguide type hyperbolic metamaterial.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields and electromagnetic waves, and in particular relates to a flat waveguide type hyperbolic metamaterial and an ultra-small resonant cavity. Background technique [0002] In the field of electromagnetic fields and electromagnetic waves, resonant cavities play a fundamental role and can be used for filtering and enhancing the interaction between electromagnetic waves and matter. They have important applications in the fields of electromagnetic wave sources, sensing, communication, and energy. It is of great significance to reduce the size of the resonant cavity while maintaining the flexibility and adjustability of its resonant characteristics. [0003] The resonant cavity needs to meet the standing wave condition: in the three directions of length, width, and height, the sum of a round-trip propagation phase and reflection phase must be an integer multiple of 2π. The small size of the resonator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01P7/06
CPCH01P7/06H01Q15/0086
Inventor 金毅何赛灵付济超
Owner ZHEJIANG UNIV
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