# US 12,600,663 B2 · Substrate, liquid crystal antenna and high-frequency device

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- Number: US 12,600,663 B2
- Document ID: US12600663B2
- Status: Granted
- Kind: B2
- Application number: 18/771,189
- Filed: 2024-07-12
- Published: 2024-11-07
- Granted: 2026-04-14
- Earliest claimed: 2018-03-20
- Assignees: AGC Inc.
- Applicants: AGC Inc.
- Inventors: Shuhei Nomura; Kazutaka Ono
- Web page: https://patentgrep.com/patent/US12600663B2

## CPC

- C03C 4/16: for dielectric glass
- H01Q 1/364: {using a particular conducting material, e.g. superconductor}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/091: containing aluminium
- H01Q 1/36: Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence)
- C03C 2204/00: Glasses, glazes or enamels with special properties
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The present invention relates to a substrate having a dielectric loss tangent (A) as measured at 20° C. and 10 GHz of 0.1 or less, a dielectric loss tangent (B) as measured at 20° C. and 35 GHz of 0.1 or less, and a ratio [a dielectric loss tangent (C) as measured at an arbitrary temperature in a range of −40 to 150° C. and at 10 GHz]/[the dielectric loss tangent (A)] of 0.90-1.10, or a substrate having a relative permittivity (a) as measured at 20° C. and 10 GHz of 4 or more and 10 or less, a relative permittivity (b) as measured at 20° C. and 35 GHz of 4 or more and 10 or less, and a ratio [a relative permittivity (c) as measured at an arbitrary temperature in a range of −40 to 150° C. and at 10 GHz]/[the relative permittivity (a)] of 0.993-1.007.

## Claims

### Claim 1

A substrate, comprising:
SiO2;
Al2O3;
B2O3;
alkali metal oxides including Na2O and K2O; and
alkaline-earth metal oxides including MgO, CaO, and SrO,
wherein the SiO2 is a main component in a mole percentage on an oxide basis,
a total amount of the Al2O3 and the B2O3 is in a range of more than 3 to 24%,
the substrate has a content molar ratio of {Al2O3/(Al2O3+B2O3)} in a range of 0.01 to 0.45,
a content molar ratio of {Na2O/(Na2O+K2O)} in a range of 0.01 to 0.99,
an amount of the Al2O3+1% is equal to or greater than 4% and is less than a total amount of the MgO, the CaO, and the SrO,
a content of the MgO is 3% or higher,
a total amount of the alkaline-earth metal oxides is in a range of 5 to 13%,
and the substrate has a relative permittivity (a) as measured at 20° C. and 10 GHz of 4 or more and 10 or less,
a relative permittivity (b) as measured at 20° C. and 35 GHz of 4 or more and 10 or less, and
a ratio represented by [a relative permittivity (c) as measured at an arbitrary temperature in a range of −40 to 150° C. and at 10 GHz]/[the relative permittivity (a)] of 0.993-1.007.

### Claim 2 (depends on 1)

The substrate according to claim 1, wherein the substrate has at least one main surface having a longest portion in a length of 10 cm or larger and a shortest portion in a length of 5 cm or larger.

### Claim 3 (depends on 1)

The substrate according to claim 1, wherein the substrate has a thickness in a range of 0.05 to 2 mm.

### Claim 4 (depends on 1)

The substrate according to claim 1, wherein the substrate has an average coefficient of thermal expansion at 50-350° C. in a range of 3 to 15 ppm/° C.

### Claim 5 (depends on 1)

The substrate according to claim 1, wherein the substrate has a Young's modulus of 40 GPa or higher.

### Claim 6 (depends on 1)

The substrate according to claim 1, wherein the substrate has a Young's modulus of 70 GPa or less.

### Claim 7 (depends on 1)

The substrate according to claim 1, wherein the substrate has a porosity of 0.1% or less.

### Claim 8 (depends on 1)

The substrate according to claim 1, wherein the substrate has a transmittance for light having 350-nm wavelength of 50% or higher.

### Claim 9 (depends on 1)

The substrate according to claim 1, wherein the substrate has a β-OH value in a range of 0.05 to 0.8 mm−1.

### Claim 10 (depends on 1)

The substrate according to claim 1, wherein the alkali metal oxides are in a total amount in a range of 0.001 to 5% in mole percentage on an oxide basis.

### Claim 11 (depends on 1)

The substrate according to claim 1, wherein the Al2O3 is in an amount in a range of 3% to 10%, and
the B2O3 is in an amount in a range of 9 to 21% in mole percentage on an oxide basis.

### Claim 12 (depends on 1)

The substrate according to claim 1, further comprising:
Fe in an amount in a range of 0 to 0.012% in terms of Fe2O3 in mole percentage on an oxide basis.

### Claim 13 (depends on 1)

The substrate according to claim 1, wherein the substrate has the content molar ratio of {Al2O3/(Al2O3+B2O3)} in a range of 0.125 to 0.45.

### Claim 14 (depends on 1)

A liquid-crystal antenna, comprising:
the substrate of claim 1.

### Claim 15 (depends on 14)

The liquid-crystal antenna according to claim 14, wherein the substrate has a β-OH value in a range of 0.05 to 0.8 mm−1.

### Claim 16 (depends on 14)

The liquid-crystal antenna according to claim 14, wherein the alkali metal oxides are in a total amount in a range of 0.001 to 5% in mole percentage on an oxide basis.

### Claim 17 (depends on 14)

The liquid-crystal antenna according to claim 14, further comprising:
Fe in an amount in a range of 0 to 0.012% in terms of Fe2O3 in mole percentage on an oxide basis.