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Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method

A technology of ferroelectric ceramics and negative magnetic permeability, which is applied in the direction of waveguide devices, electrical components, circuits, etc., and can solve the problems of limited application range, expensive, and complex geometric shapes of metal structural units

Inactive Publication Date: 2008-03-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the electromagnetic response characteristics of LHMs based on metal structural units are anisotropic, that is, they only have negative electromagnetic parameters in a certain direction, which greatly limits their application range.
Although gratifying progress has been made in the use of metal structural units to realize LHMs in the infrared and visible light bands, it is difficult and expensive to prepare micro-nano structural units using existing microfabrication techniques due to the complex geometry of metal structural units.
At the same time, the loss of metals in the infrared and visible light bands is very large, thus limiting the realization of its electromagnetic properties

Method used

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  • Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method
  • Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method
  • Electric field-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of Ba by solid-phase reaction synthesis 0.5 Sr 0.5 TiO 3 (BST) powder. The method uses high-purity BaCO 3 , SrCO 3 and TiO 2 As a raw material, react with the following equation to obtain Ba 0.5 Sr 0.5 TiO 3 Powder.

[0048] 0.5BaCO 3 +0.5SrCO 3 +TiO 2 = Ba 0.5 Sr 0.5 TiO 3 +CO 2 ↑

[0049] BaCO 3 , SrCO 3 and TiO 2 Mix according to the above proportions, after ball milling, drying and sieving, calcining at 1150°C for 3 hours, then ball milling and drying to obtain BST powder for use.

[0050] Using the ceramic slurry casting technology, the BST powder and organic solvent are made into a slurry for casting to obtain a cast sheet with a thickness of 1.25mm, and then the cast sheet is cut into cubes with a side length of 1.25mm and processed at 300 ℃ for debinding, and finally sintered at 1350 ℃ for 3 hours to obtain a ferroelectric ceramic cube with a side length of 1.0 mm. The relationship curve of its dielectric properties with the appl...

Embodiment 2

[0054] With embodiment one, utilize solid phase reaction synthesis method to prepare Ba 0.5 Sr 0.5 TiO 3 (BST) powder, using ceramic slurry casting technology to cast and discharge glue, sintering to obtain BST ceramic cubes with a side length of 0.70mm. The relationship curve of its dielectric properties with the applied electric field is shown in Figure 2. It can be seen that its relative permittivity at room temperature and zero field is 2000.

[0055] A circular hole array with a diameter of 1.00 mm is drilled on a polytetrafluoroethylene plate with a thickness of 2.50 mm by using a numerical control machine tool. The ceramic cubes were embedded into the round holes of the polytetrafluoroethylene template to produce a two-dimensional array of ceramic cubes. Then align the round holes of the polytetrafluoroethylene plates embedded with ceramic cubes to perform lamination and bonding to obtain a three-dimensional ceramic cube array.

[0056] The electric field tunable ne...

Embodiment 3

[0058] With embodiment one, utilize solid phase reaction synthesis method to prepare Ba 0.4 Sr 0.6 TiO 3 (BST) powder, mix BST powder with 5wt% MgO powder and mix with organic solvent to form a slurry for casting to make a casting sheet with a thickness of 0.57mm, then debinding and sintering to obtain the side length A ceramic cube of 0.45mm has a relative permittivity of 1600 at room temperature and zero field.

[0059] A circular hole array with a diameter of 0.64 mm is drilled on a polytetrafluoroethylene plate with a thickness of 1.00 mm by using a numerical control machine tool. The ceramic cubes were embedded into the round holes of the polytetrafluoroethylene template to produce a two-dimensional array of ceramic cubes. Then align the round holes of the polytetrafluoroethylene plates embedded with ceramic cubes to perform lamination and bonding to obtain a three-dimensional ceramic cube array.

[0060] Finally, the three-dimensional ceramic cube array is bonded tog...

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Abstract

This invention relates to a negative permeability device with adjustable electric field based on ferroelectric ceramic particles and its preparation method, in which, the device is composed of two parallel metal pole plates, multiple laminated teflon templates set between the two pole plates, ferroelectric ceramic particles and DC supply, in which, a hole array is set on each teflon template filled with the particles, and the device can drive electromagnetic waves to generate strong magnetic resonance at a certain band and have isotropical negative permeability effect adjacent to the magnetic resonance to realize controlling negative magnetic conductivity and utilizes the adjustment property of field to dielectric constant of ferroelectric ceramic particles to realize controlling its negative permeability.

Description

technical field [0001] The invention relates to an isotropic negative magnetic permeability device based on ferroelectric ceramic particles, in particular to an electric field tunable negative magnetic permeability device. Background technique [0002] The study of left-handed metamaterials (LHMs) is a frontier and hot issue in the research fields of physics, materials science and electromagnetism, and has broad application prospects. The effective permittivity and permeability of LHMs are both less than zero in a certain frequency band, and the typical structure for realizing LHMs is a composite structure of metal split resonator rings (SRRs) and metal wires. The magnetic permeability of the periodically arranged SRRs array is negative in a narrow frequency band near its magnetic resonance frequency, while the periodically arranged metal rod array has a negative permittivity in a wider frequency band smaller than its plasma frequency. Thus, the non-overlapping property of ...

Claims

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Application Information

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IPC IPC(8): H01P1/217H01P1/215
Inventor 周济赵乾康雷杜波赵宏杰李勃
Owner TSINGHUA UNIV
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