# US 11,027,985 B2 · BMW-based high frequency dielectric ceramic material and method for manufacturing same

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- Number: US 11,027,985 B2
- Document ID: US11027985B2
- Status: Granted
- Kind: B2
- Application number: 16/499,862
- Filed: 2018-02-26
- Published: 2020-04-09
- Granted: 2021-06-08
- Earliest claimed: 2017-03-31
- Assignees: Chang Yong Oh
- Applicants: Gangneung-Wonju National University Industry Academy Cooperation Group
- Inventors: Sang Ok Yoon; Shin Kim; Chang Bae Hong
- Web page: https://patentgrep.com/patent/US11027985B2

## CPC

- C01G 41/006: {Compounds containing tungsten, with or without oxygen or hydrogen, and containing two or more other elements}
- H01B 3/12: ceramics
- C01P 2002/52: containing elements as dopants
- C01P 2006/40: Electric properties
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present invention relates to a dielectric ceramic material for resonators, filters, and oscillators being used in a wireless communication system and, most particularly, to a Ba(Mg0.5W0.5)O3-type high frequency dielectric ceramic material having an appropriate dielectric constant and a high quality factor in a high frequency band and a method for preparing the same. For this, Ba(Mg0.5W0.5)O3 has been chosen as a material having excellent high frequency dielectric properties. At this point, an alkali metal or alkaline earth metal element partly substitutes Barium (Ba), and, for compensation, a metal of a +3 oxidation state is added quantitatively in the place of Magnesium (Mg). Accordingly, a high frequency dielectric ceramic material compound having a high quality factor and a stable temperature property is prepared. When needed, a metal of a +5 oxidation state may be further added quantitatively in the place of Tungsten (W).

## Claims

### Claim 1

A BMW-type high frequency dielectric ceramic material being configured of a (Ba1-a-bMaaMbb)(Mg0.5-cMccW0.5)O3 composition, wherein Ma and Mb respectively represent an alkali metal and an alkaline earth metal, wherein Mc represents a metal of a +3 oxidation state, wherein each of a and c is within a range of 0.01 to 0.1, and wherein b is within a range of 0.09 to 0.25.

### Claim 2 (depends on 1)

The BMW-type high frequency dielectric ceramic material of claim 1, wherein the (Ba1-a-bMaaMbb)(Mg0.5-cMccW0.5-eMee)O3 composition is configured by further substituting part of W with Me, Me being a metal element of a +5 oxidation state, and wherein e is within a range of 0.01 to 0.05.

### Claim 3 (depends on 1)

The BMW-type high frequency dielectric ceramic material of claim 1, wherein the Ma is an alkali metal element of a +1 oxidation state being indicated as Ma2O, and wherein any one of Na, K, and Li is selected as the Ma.

### Claim 4 (depends on 1)

The BMW-type high frequency dielectric ceramic material of claim 1, wherein the Mb is an alkaline earth metal element of a +2 oxidation state being indicated as MbO, and wherein any one of Sr and Ca is selected as the Mb.

### Claim 5 (depends on 1)

The BMW-type high frequency dielectric ceramic material of claim 1, wherein the Mc is a Lanthanide group metal element of a +3 oxidation state being indicated as Mc2O3, and wherein any one of Sc, Y, Sm, Gd, Yb, and Dy is selected as the Mc, or wherein the Mc is a Boron group metal element being indicated as Mc2O3, and wherein In is selected as the Mc.

### Claim 6 (depends on 2)

The BMW-type high frequency dielectric ceramic material of claim 2, wherein the Me is a Vanadium group metal element of a +5 oxidation state being indicated as Me2O5, and wherein any one of Nb and Ta is selected as the Me.

### Claim 7 (depends on 1)

The BMW-type high frequency dielectric ceramic material of claim 1, wherein the Ma and the Mb are both added for a purpose of achieving a quality factor greater than or equal to 100,000 GHz.

### Claim 8 (depends on 2)

The BMW-type high frequency dielectric ceramic material of claim 2, wherein the Mb and the Me are separately or both added for a purpose of achieving a temperature coefficient within a stable range of ±10 ppm/° C.