PTFE (polytetrafluoroethylene)-based microwave composite dielectric substrate and preparation method thereof

A composite medium and microwave technology, which is applied in the field of PTFE-based microwave composite medium substrate and its preparation, can solve the problems of small dielectric loss and the inability of microwave composite medium substrate to satisfy high dielectric constant at the same time.

Active Publication Date: 2019-02-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that although microwave composite dielectric substrates have great application prospects in terms of comprehensive performance, none of the microwave composite dielectric substrates prepared in the prior art can simultaneously satisfy the properties of high dielectric constant, low temperature coefficient, and small dielectric loss.

Method used

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  • PTFE (polytetrafluoroethylene)-based microwave composite dielectric substrate and preparation method thereof
  • PTFE (polytetrafluoroethylene)-based microwave composite dielectric substrate and preparation method thereof
  • PTFE (polytetrafluoroethylene)-based microwave composite dielectric substrate and preparation method thereof

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preparation example Construction

[0029] The invention provides a method for preparing a PTFE-based microwave composite dielectric substrate, comprising the following steps:

[0030] Provide high dielectric perovskite ceramics;

[0031] mixing the high-intermediate perovskite ceramics with polytetrafluoroethylene to obtain an organic-inorganic blend;

[0032] Molding the organic-inorganic blend to obtain a composite material pre-pressed tablet;

[0033] The composite material pre-pressed sheet is vacuum hot-pressed to obtain a PTFE-based microwave composite dielectric substrate.

[0034] The invention provides high dielectric perovskite ceramics. The present invention preferably adopts the solid phase synthesis method to prepare the high dielectric perovskite type ceramics. In the present invention, the solid-phase synthesis method preferably includes high-temperature sintering, the temperature of the high-temperature sintering is preferably 1100° C., and the time is preferably 12 hours.

[0035] After the...

Embodiment 1

[0045] The high-dielectric perovskite-type ceramic powder prepared by the solid-phase synthesis method is pulverized and particle size controlled by jet milling to obtain an inorganic high-dielectric perovskite-type ceramic filler with D50 of 7 μm and uniform particle size distribution; the high-dielectric perovskite type ceramic filler is obtained. Dielectric constant ε of mineral ceramic powder r is 105, the dielectric loss tgδ is less than 5×10 -3 , ε r The absolute value of the temperature coefficient is less than 30ppm / ℃;

[0046] The particle size of the polytetrafluoroethylene resin powder is controlled by jet milling to obtain an organic polytetrafluoroethylene resin filler with a D50 of 10 μm and a uniform particle size distribution;

[0047] Mix the ceramic powder and the polytetrafluoroethylene resin powder in a double-center mixer at a mass ratio of 1:1 to obtain a uniform blend of the filler and the matrix;

[0048] The above mixture is evenly spread in the mol...

Embodiment 2

[0057] The high-dielectric perovskite-type ceramic powder prepared by the solid-phase synthesis method is pulverized and particle size controlled by jet milling to obtain an inorganic high-dielectric perovskite-type ceramic filler with a D50 of 7 μm and a uniform particle size distribution; the high-dielectric perovskite type ceramic filler; Dielectric constant ε of mineral ceramic powder r is 105, the dielectric loss tgδ is less than 5×10 -3 , ε r The absolute value of the temperature coefficient is less than 30ppm / ℃;

[0058] The particle size of the polytetrafluoroethylene resin powder is controlled by jet milling to obtain an organic polytetrafluoroethylene resin filler with a D50 of 10 μm and a uniform particle size distribution;

[0059] Mix the ceramic powder and the polytetrafluoroethylene resin powder in a double-center mixer at a mass ratio of 3:2 to obtain a uniform blend of the filler and the matrix;

[0060] The above mixture is evenly spread in the mold, and p...

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Abstract

The invention provides a PTFE (polytetrafluoroethylene)-based microwave composite dielectric substrate and a preparation method thereof, and belongs to the field of microwave dielectric. According tothe invention, perovskite ceramic is mixed with PTFE, the ceramic filler and the polymer matrix are uniformly mixed with a compression molding method and a vacuum hot pressing method to ensure that amaterial is dense and is endowed with certain mechanical properties and good dielectric properties, and the high-dielectric, low-loss and low-temperature-drift PTFE-based microwave composite dielectric substrate is prepared and obtained. Data of an embodiment show that the dielectric constant epsilonr of the PTFE-based microwave composite dielectric substrate prepared with the method is 5.9 to 10.5, the dielectric loss tgdelta is less than 3*10<-3>, and the absolute value of the temperature coefficient of epsilonr is less than 200 ppm / DEG C.

Description

technical field [0001] The invention relates to the field of microwave dielectrics, in particular to a PTFE-based microwave composite dielectric substrate and a preparation method thereof. Background technique [0002] Microwave composite dielectric materials have the advantages of good flexibility and high processability of polymers, and also have the characteristics of excellent dielectric properties and dimensional stability of microwave dielectric ceramics. Because of its excellent microwave performance, it is widely used in electronic equipment such as satellite communication, navigation, solid-state phased array radar and radio and television. Among them, the performance of new microwave dielectric materials based on polytetrafluoroethylene (PTFE)-based composite glass fiber or composite ceramic powder is the most outstanding. It has good broadband and high-frequency characteristics and can be used for antennas, complex multi-layer circuits and microwaves. Circuits an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/08C04B40/02
CPCC04B26/08C04B2111/00844C04B18/023C04B40/0259C04B40/0263C04B20/0076
Inventor 周静祁琰媛陈文沈杰郑柳
Owner WUHAN UNIV OF TECH
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