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Preparation method of multilayer heterogeneous ceramic high temperature co-fired LC filter

A LC filter, high temperature co-firing technology, applied in the field of filter manufacturing, can solve the problems of material co-firing mismatch, affecting device performance and reliability, holes, etc. The effect of electric constant

Active Publication Date: 2017-08-01
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the sintering temperature, shrinkage and other sintering characteristics of the two heterogeneous functional layers and the silver-palladium paste are different, co-firing after lamination will cause the problem of co-firing mismatch of materials between layers, and Causes warping, cracking or microscopic cracks, holes and other defects in the co-fired ceramic body, which seriously affects the performance and reliability of the device

Method used

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  • Preparation method of multilayer heterogeneous ceramic high temperature co-fired LC filter
  • Preparation method of multilayer heterogeneous ceramic high temperature co-fired LC filter
  • Preparation method of multilayer heterogeneous ceramic high temperature co-fired LC filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1: the dielectric constant is 25 microwave dielectric ceramics (K25) and Ni-Zn-Fe ferrite multi-layer high temperature co-fired LC filter preparation

[0074] according to figure 1 The process shown prepares K25 microwave dielectric ceramics and Ni-Zn-Fe ferrite multilayer high-temperature co-fired LC filter. The technical specifications are as follows: passband frequency (GHz): (3.94-5.5); insertion loss (dB): ≤4.5; In-band fluctuation (dB): ≤1.5; Out-of-band suppression: ≥45dB@(f≤2.75GHz&f≥6.34GHz); Input and output standing waves: ≤1.5. The final filter size is 1608 (metric system, 1.6×0.8mm), and the specific preparation steps are as follows:

[0075] (a) Simulation design of a multilayer heterogeneous ceramic LC filter: a sandwich structure in which the upper and lower layers are microwave dielectric layers and the middle is a microwave ferrite layer. Among them, the inductance layer is made of Ni-Zn-Fe ferrite magnetic material with a permeability of ...

Embodiment 2

[0092] Example 2: Preparation of a multilayer high temperature co-fired LC filter with a dielectric constant of 38 microwave dielectric ceramics (K38) and ferrite

[0093] The index of the filter in Embodiment 2 is the same as that of the LC filter in Embodiment 1. However, due to the replacement of K25 with a barium-titanium-based microwave dielectric ceramic layer (K38), the dielectric constant increases and the sintering temperature decreases. In order to make heterogeneous ceramics high-temperature matching co-firing, the microwave ferrite material is adjusted to Ni-Zn -Fe-Cu system. The size of the final filter can be further reduced to 1005 (1×0.5mm). The specific preparation steps are as follows:

[0094] (a) The simulation design of the multilayer heterogeneous ceramic LC filter: also adopts the sandwich structure of microwave dielectric ceramic sandwiched by microwave ferrite on both sides. Among them, the inductance layer is made of Ni-Zn-Fe-Cu ferrite magnetic mat...

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Abstract

The invention provides a preparation method of a multilayer heterogeneous ceramic high temperature co-fired LC filter. According to the method provided by the invention, through designing a microwave ferrite material and microwave dielectric ceramic raw material formula and a flow-casting material formula, and adjusting a flow-casting process and a co-firing process, the technical problems of poor heat radiation performance and high-frequency electrical property, too many layers of a product, larger size and the like caused by the reason that an LC filter in the prior art adopts a homogeneous microwave dielectric material as a raw material can be effectively solved, and a multilayer chip LC filter product is developed to the directions of microminiaturization, light weight, high frequency and high quality, is of great significance and has a favorable market application prospect.

Description

technical field [0001] The invention relates to the field of filter manufacturing, in particular to a method for preparing a multilayer heterogeneous ceramic high-temperature co-fired LC filter. Background technique [0002] With the advancement of science and technology, the requirements for wireless communication technology in aerospace and other fields have gradually increased, and higher requirements have been put forward for the integration, electrical performance, volume, weight, reliability, and amplitude-phase consistency of microwave electronic components. Require. Multi-layer co-fired ceramics (including low-temperature and high-temperature multi-layer co-fired ceramics) have become the material of choice for multi-chip modules (MCM, Multi-Chip Module) due to their excellent electrical, mechanical and thermal properties. MCM can be multi-layered in 3D (three-dimensional) The form of the circuit structure realizes the high integration of various low-power radio fre...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/26C04B35/468C04B35/622C04B35/64C04B35/638B28B1/29
CPCB28B1/29C04B35/2666C04B35/465C04B35/468C04B35/622C04B35/638C04B35/64C04B2235/3206C04B2235/3208C04B2235/3227C04B2235/3251C04B2235/3279C04B2235/3281C04B2235/3284C04B2235/3298C04B2235/3418C04B2235/6562C04B2235/6567
Inventor 窦占明庞锦标杨俊居奎何创创贾朋乐韩玉成
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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