Dielectric ceramic and dielectric filter provided with same

A dielectric ceramic and quality technology, applied in the direction of fixed capacitor dielectrics, ceramics, waveguide-type devices, etc., can solve problems such as rising prices, and achieve the effects of good performance, improved Qf value, and high reliability

Inactive Publication Date: 2015-05-27
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to environmental restrictions, production restrictions, output restrictions, etc., the price of raw materials for rare earth elements has recently increased, so dielectric ceramics that are made of materials that do not contain rare earth elements and have excellent dielectric properties are required

Method used

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  • Dielectric ceramic and dielectric filter provided with same
  • Dielectric ceramic and dielectric filter provided with same
  • Dielectric ceramic and dielectric filter provided with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Various samples were produced in which the composition range of the main component and the cooling rate during firing were changed, and the dielectric properties were compared. The details of the manufacturing method and the dielectric characteristic measuring method will be described below.

[0056] As a raw material, zirconia (ZrO 2 ), titanium oxide (TiO 2 ), zinc oxide (ZnO) and niobium oxide (Nb 2 o 5 ) of each powder. Next, the composition of the sintered body was adjusted to the ratio (molar ratio) in Table 1, and each powder was weighed. Then, the weighed zirconia (ZrO 2 ), titanium oxide (TiO 2 ), zinc oxide (ZnO) and niobium oxide (Nb 2 o 5 ) together with pure water into a ball mill using zirconia balls or the like, wet mixing and pulverization until the average particle diameter becomes 2 μm or less, thereby obtaining a primary raw material.

[0057] Next, after drying the primary raw material, it was calcined at 1100° C. for 2 hours, and the calcin...

Embodiment 2

[0071] Next, Sample Nos. 38 to 45 were produced by the same composition and method as Sample No. 19 in Example 1, except that the cooling rate from the highest temperature to 700°C was changed in various ways as shown in Table 2. . In addition, sample No. 38 is the same as sample No. 19, and sample No. 40 is the same as sample No. 34.

[0072] In addition, for samples No. 38 to 45, the Qf value was measured by the same method as in Example 1, and the improvement in the Qf value calculated by using the measured value as the numerator and the Qf value of sample No. 19 as the denominator Rates are shown in Table 2.

[0073] In addition, regarding the surface of the sintered body as each sample, Zn was measured with an electron beam microanalyzer under the same conditions as in Example 1. Then, the area occupancy ratio of Zn concentration of 5% or more was calculated from the color mapping result obtained by recording the detected characteristic X-ray intensity of Zn in X-Y coor...

Embodiment 3

[0078] Next, Sample Nos. 46 to 50 were produced by the same composition and method as Sample No. 43 of Example 2 except that CaO was converted into CaO content as shown in Table 3, except that Ca was variously changed. In addition, sample No. 46 has the same composition as sample No. 43. In addition, calcium oxide as a Ca source was added before calcining.

[0079] Moreover, about the said sample No. 46-50, Qf value was measured by the method similar to Example 1. In addition, the resonance frequency in the temperature range of -40 to 80°C was measured, and the temperature coefficients τf1 and 20 to 80 of the resonance frequency at -40 to 20°C (low temperature range) were calculated based on the resonance frequency at 20°C. The temperature coefficient τf2 of the resonant frequency in °C (high temperature range) was obtained by subtracting τf2 from τf1 as Δ, τf, and the results are shown in Table 3.

[0080] In addition, a part of each sample was pulverized, and the obtained ...

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Abstract

[Problem] To provide, using a material which does not contain any rare earth element, a dielectric ceramic which exhibits a relative permittivity (er) of 40 to 46 and an enhanced Qf value; and to provide a dielectric filter provided with the same. [Solution] A dielectric ceramic comprising a sintered body such that when the composition is represented by the compositional formula aZrO2·ßTiO2· ?ZnO·dNb2O5, the molar ratios a, ß, ? and d satisfy 0.3000=a=0.5500, 0.3300=ß=0.6000, 0.0108=?=0.0717, 0.0193 =d=0.1283, a+ß+?+d=1, and 0.5<? / d=1, wherein areas having Zn concentrations of 5% or more occupy at least some of the surface of the sintered body.

Description

technical field [0001] The present invention relates to a dielectric ceramic used in a relay base station or a BS antenna of a mobile phone, and a dielectric filter including the dielectric ceramic. Background technique [0002] Dielectric filters including dielectric ceramics are incorporated in relay base stations or BS antennas of mobile phones. As the dielectric characteristics required for this dielectric ceramic, the relative permittivity εr varies due to the difference in the required characteristics of the dielectric filter, but in each relative permittivity εr, the Qf value (based on the cylindrical resonator Method (International Standard IEC61338-1-3 (1999)) is measured at a frequency of 3.5 to 4.5 GHz, and converted to 1 GHz according to the relationship (Q value) × (measurement frequency f) = constant that is usually established in microwave media The value is relatively high. Moreover, as such dielectric ceramics, materials containing rare earth elements such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/49H01B3/12H01G4/12H01P1/20H01P7/10H03H9/17
CPCH01P7/10C01G25/00C01G33/006C01P2002/52C01P2006/40C04B35/49C04B2235/3208C04B2235/3217C04B2235/3225C04B2235/3229C04B2235/3234C04B2235/3251C04B2235/3256C04B2235/3267C04B2235/3281C04B2235/3284C04B2235/3418C04B2235/6567C04B2235/77C04B2235/80H01B3/12H01G4/1245
Inventor 丰田谕史竹之下英博小松刚士
Owner KYOCERA CORP
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