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Temperature-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: 2009-10-21
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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  • Temperature-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method
  • Temperature-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method
  • Temperature-tunable negative magnetic permeability part based on ferroelectric ceramic grain and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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.

[0047] 0.5BaCO 3 +0.5SrCO 3 +TiO 2 = Ba 0.5 Sr 0.5 TiO 3 +CO 2 ↑

[0048] 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.

[0049] Using the ceramic slurry casting technology, the BST powder prepared above is made into a slurry for casting to obtain a BST casting sheet with a thickness of 0.63mm, and then cut the casting sheet into cubes with a side length of 0.63mm . Then the BST cube was debinding at 400°C, and finally sintered at 1400°C for 3 hours to obtain a BST ceramic cube with a side length of 0.45mm. The measurement results of its temperature and dielectric propertie...

Embodiment 2

[0053] With embodiment one, utilize solid phase reaction synthesis method to prepare Ba 0.5 Sr 0.5 TiO 3 (BST) powder, and the BST ceramic cube whose side length is 0.55mm is obtained by using ceramic slurry casting technology.

[0054] A circular hole array with a diameter of 0.78 mm is drilled on a polytetrafluoroethylene plate with a thickness of 1.25 mm by using a numerical control machine tool. Then, using the polytetrafluoroethylene plate as a template, the ceramic cubes were embedded into the round holes of the polytetrafluoroethylene template to prepare a two-dimensional ceramic cube array. 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.

[0055] The above-mentioned three-dimensional BST cube array is placed in a temperature control device to obtain a temperature-tunable isotropic negative magnetic permeability device of ferroelectric cera...

Embodiment 3

[0057] 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 1.25mm, then debinding and sintering to obtain the side length A ceramic cube with a diameter of 1.0mm has a relative permittivity of 1600 at room temperature of 25°C.

[0058] A circular hole array with a diameter of 1.42 mm was drilled on a polytetrafluoroethylene plate with a thickness of 2.5 mm by using a numerical control machine tool. Then, using the polytetrafluoroethylene plate as a template, the ceramic cubes were embedded into the round holes of the polytetrafluoroethylene template to prepare a two-dimensional ceramic cube array. 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. The abo...

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Abstract

A temperature-tunable negative magnetic permeability device based on ferroelectric ceramic particles and its preparation method. The device is composed of multiple stacked polytetrafluoroethylene templates, ferroelectric ceramic particles and a temperature control device; each polytetrafluoroethylene template is equipped with There is an array of circular holes into which ferroelectric ceramic particles are embedded. The device can make the electromagnetic wave have a strong magnetic resonance in a certain frequency band, and has an isotropic negative magnetic permeability effect near the magnetic resonance, and realizes its negative magnetic permeability by using the adjustment characteristic of temperature to the dielectric constant of ferroelectric ceramic particles Rate controllability. The invention endows the left-handed material with intelligent characteristics, and will be applied to the fields of optoelectronic devices such as adjustable band-pass filters, adjustable negative refractive index flat lenses, adjustable stealth devices, and communications.

Description

technical field [0001] The invention relates to an isotropic negative magnetic permeability device based on ferroelectric ceramic particles, in particular to a temperature-tunable isotropic 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 periodically arranged array of SRRs at its resonant frequency ω 0 There is a strong magnetic resonance at , while the permeability is negative at a frequency slightly above its resonance, but this frequency band is usually narrow. However, a periodically arranged array of metal rods exhibits microwave plasm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/217H01P1/215
Inventor 周济赵乾杜波康雷赵宏杰李勃
Owner TSINGHUA UNIV