Glass-ceramic microwave filters

Patent metadata

Field	Value
Publication number	US-11258419-B2
Application number	US-202017023713-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Sep 26, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

Embodiments of a filter for electromagnetic radiation are disclosed herein. The filter includes a first glass-ceramic substrate having a first refractive index, a second glass-ceramic substrate having the first refractive index, and a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate. The first region has a second refractive index that is less than the first refractive index. Further, the second glass-ceramic substrate is arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate. The filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies. The band of frequencies is located within the frequency range of 20 GHz to 100 GHz.

First claim

What is claimed is:

1. A method of filtering electromagnetic radiation incident upon an antenna unit comprising an antenna array, comprising the steps of:
providing a microwave filter between the electromagnetic radiation and the antenna array, the microwave filter comprising a first glass-ceramic substrate having a first refractive index, a second glass-ceramic substrate having the first refractive index, and a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, wherein the first region has a second refractive index that is less than the first refractive index;
transmitting at least 70% of electromagnetic radiation within a band of frequencies through the microwave filter, the band of frequencies being located within a frequency range of 20 GHz to 100 GHz; and
reflecting at least 80% of electromagnetic radiation outside the band of frequencies from the microwave filter, wherein the first glass-ceramic substrate and the second glass-ceramic substrate each have a composition comprising:
45 mol % to 70 mol % of SiO 2 ;
12 mol % to 20 mol % Al 2 O 3 ;
4 mol % to 10 mol % of TiO 2 ;
0 mol % to 10 mol % ZnO; and
3 mol % to 30 mol % MgO.

2. A filter for electromagnetic radiation, comprising:
a first glass-ceramic substrate having a first refractive index;
a second glass-ceramic substrate having the first refractive index, the second glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate; and
a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, the first region having a second refractive index that is less than the first refractive index;
wherein the filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies; and
wherein the band of frequencies is located within a frequency range of 20 GHz to 100 GHz, wherein the band of frequencies has a width that is 2 GHz or less.

3. The filter of claim 2 , wherein the first region is an air gap.

4. The filter of claim 2 , further comprising:
a third glass-ceramic substrate having the first refractive index;
a second region disposed between the second glass-ceramic substrate and the third glass-ceramic substrate, the second region having the second refractive index;
wherein the filter reflects at least 90% of electromagnetic radiation outside the band of frequencies.

5. A filter for electromagnetic radiation, comprising:
a first glass-ceramic substrate having a first refractive index;
a second glass-ceramic substrate having the first refractive index, the second glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate; and
a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, the first region having a second refractive index that is less than the first refractive index;
wherein the filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies; and
wherein the band of frequencies is located within a frequency range of 20 GHz to 100 GHz, wherein the band of frequencies is centered on a particular frequency and wherein the first region has a thickness equal to a quarter of a wavelength of a wave having the particular frequency.

6. A filter for electromagnetic radiation, comprising:
a first glass-ceramic substrate having a first refractive index;
a second glass-ceramic substrate having the first refractive index, the second glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate; and
a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, the first region having a second refractive index that is less than the first refractive index;
wherein the filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies; and
wherein the band of frequencies is located within a frequency range of 20 GHz to 100 GHz, wherein the first glass-ceramic substrate, the first region, the second glass-ceramic substrate comprise a first set of layers and wherein the filter further comprises:
a second set of layers, comprising:
a third glass-ceramic substrate having the first refractive index;
a fourth glass-ceramic substrate having the first refractive index, the fourth glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the third glass-ceramic substrate; and
a second region disposed between the third glass-ceramic substrate and the fourth glass-ceramic substrate, the second region having the second refractive index;

wherein the band of frequencies is centered on a particular frequency;
wherein the first region and the second region each have a first thickness equal to a quarter of a wavelength of a wave having the particular frequency;
wherein a third region is disposed between the first set of layers and the second set of layers, the third region having the second refractive index; and
wherein the third region has a second thickness equal to half of the wavelength of the wave having the particular frequency.

7. The filter of claim 6 , wherein the band of frequencies has a width of 100 MHz or less.

8. A filter for electromagnetic radiation, comprising:
a first glass-ceramic substrate having a first refractive index;
a second glass-ceramic substrate having the first refractive index, the second glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate; and
a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, the first region having a second refractive index that is less than the first refractive index;
wherein the filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies; and
wherein the band of frequencies is located within a frequency range of 20 GHz to 100 GHz, wherein the first glass-ceramic substrate and the second glass-ceramic substrate each have a composition comprising:
45 mol % to 70 mol % of SiO 2 ;
12 mol % to 20 mol % Al 2 O 3 ;
4 mol % to 10 mol % of TiO 2 ;
0 mol % to 10 mol % ZnO; and
3 mol % to 30 mol % MgO.

9. A filter for electromagnetic radiation, comprising:
a first glass-ceramic substrate having a first refractive index;
a second glass-ceramic substrate having the first refractive index, the second glass-ceramic substrate being arranged substantially parallel to and spatially disposed from the first glass-ceramic substrate; and
a first region disposed between the first glass-ceramic substrate and the second glass-ceramic substrate, the first region having a second refractive index that is less than the first refractive index;
wherein the filter transmits at least 70% of electromagnetic radiation within a band of frequencies and reflects at least 80% of electromagnetic radiation outside the band of frequencies; and
wherein the band of frequencies is located within a frequency range of 20 GHz to 100 GHz, wherein the first region comprises a hydrogen microfoam, comprising:
55 wt % to 60 wt % of SiO 2 ;
8 wt % to 12 wt % of B 2 O 3 ;
5 wt % to 10 wt % of ZnO; and
25 wt % to 30 wt % P 2 O 5 .

10. A method o

Assignees

• Corning Inc

Inventors

• Beall George Halsey
• Borrelli Nicholas Francis
• Cai Ling
• Koch Iii Karl William
• Tietje Steven Alvin

Classifications

• H01Q15/0026 Primary

  said selective devices having a stacked geometry or having multiple layers · CPC title

• H03H1/00 Primary

  Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network (constructional details of electromechanical transducers H03H9/00) · CPC title

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title

• H03H2001/0085

  Multilayer, e.g. LTCC, HTCC, green sheets · CPC title

• H03H2001/0021

  Constructional details · CPC title