# US 12,191,564 B2 · Transmit-receive isolation for a dual-polarized MIMO antenna array

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- Number: US 12,191,564 B2
- Document ID: US12191564B2
- Status: Granted
- Kind: B2
- Application number: 17/815,908
- Filed: 2022-07-28
- Published: 2023-02-16
- Granted: 2025-01-07
- Earliest claimed: 2021-07-29
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jiantong Li; Xinguang Xu; Khurram Muhammad; Gang Xu
- Web page: https://patentgrep.com/patent/US12191564B2

## CPC

- H01Q 1/523: {between antennas of an array}
- H01Q 1/525: {between emitting and receiving antennas}
- H01Q 1/246: {specially adapted for base stations}
- H01Q 21/065: {Patch antenna array}
- H01Q 21/24: Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction {(circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001)}
- H01Q 21/28: Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An apparatus includes a substrate, a first antenna panel, a second antenna panel, and an antenna isolator. The first antenna panel is coupled on the substrate and includes an array of first antenna elements. The second antenna panel is coupled on the substrate and includes an array of second antenna elements. The antenna isolator is coupled on the substrate and including a plurality of walls extending outwardly from the substrate along a length of the substrate between the first antenna panel and the second antenna panel. The antenna isolator reduces reduce wave propagation between the array of first antenna elements and the array of second antenna elements.

## Claims

### Claim 1

An apparatus comprising:
a substrate;
a first antenna panel coupled on the substrate and comprising an array of first antenna elements;
a second antenna panel coupled on the substrate and comprising an array of second antenna elements; and
an antenna isolator coupled on the substrate, the antenna isolator comprising a plurality of walls extending outwardly from the substrate along a length of the substrate between the first antenna panel and the second antenna panel, the antenna isolator configured to reduce wave propagation between the array of first antenna elements and the array of second antenna elements,
wherein the plurality of walls includes:
a T-shaped wall configured to reduce horizontal diffraction that extends along the length of the substrate from a first end of the substrate to a second end of the substrate, and
a first L-shaped wall positioned between the T-shaped wall and the first antenna panel that extends along the length of the substrate from the first end of the substrate to the second end of the substrate.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein:
the T-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate,
a second wall that extends in a first direction from a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate, and
a third wall that extends in a second direction opposite to the first direction from the second end of the first wall, and
the first L-shaped wall is configured to reduce directed path and vertical diffraction from the array of first antenna elements, wherein the first L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction towards the first antenna panel.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein:
the plurality of walls of the antenna isolator further includes a second L-shaped wall positioned between the T-shaped wall and the second antenna panel, and
the second L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction towards the second antenna panel.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein:
the antenna isolator further includes a third L-shaped wall positioned between the first L-shaped wall and the T-shaped wall,
the third L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction away from the T-shaped wall,
a fourth L-shaped wall positioned between the second L-shaped wall and the T-shaped wall, and
the fourth L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction away from the T-shaped wall.

### Claim 5 (depends on 3)

The apparatus of claim 3, wherein:
lengths of extensions from the substrate of first and second walls of the first L-shaped wall are selected as a function of a resonance frequency of the first antenna panel to reduce diffraction from the first antennal panel,
lengths of extensions from the substrate of first and second walls of the second L-shaped wall are selected as a function of a resonance frequency of the second antenna panel to reduce diffraction from the second antennal panel, and
a distance between the first and second L-shaped walls is selected as a function of a resonance frequency of the first antenna panel to reduce a port-to-port coupling.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the antenna isolator further includes a resistive film applied to a surface of the antenna isolator.

### Claim 7 (depends on 1)

The apparatus of claim 1, further comprising a ground plane coupled to the antenna isolator,
wherein slots are etched into the ground plane to suppress a surface current.

### Claim 8

An electronic device comprising:
a multiple-input multiple-output (MIMO) antenna comprising:
a substrate;
a first antenna panel coupled on the substrate and comprising an array of first antenna elements;
a second antenna panel coupled on the substrate and comprising an array of second antenna elements; and
an antenna isolator coupled on the substrate, the antenna isolator comprising a plurality of walls extending outwardly from the substrate along a length of the substrate between the first antenna panel and the second antenna panel, the antenna isolator configured to reduce wave propagation between the array of first antenna elements and the array of second antenna elements, wherein the plurality of walls includes:
a T-shaped wall configured to reduce horizontal diffraction that extends along the length of the substrate from a first end of the substrate to a second end of the substrate, and
a first L-shaped wall positioned between the T-shaped wall and the first antenna panel that extends along the length of the substrate from the first end of the substrate to the second end of the substrate;
TX processing circuitry coupled to the first antenna panel and configured to provide signals to the array of first antenna elements; and
RX processing circuitry coupled to the second antenna panel and configured to receive signals from the array of second antenna elements.

### Claim 9 (depends on 8)

The electronic device of claim 8, wherein;
the T-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate,
a second wall that extends in a first direction from a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate, and
a third wall that extends in a second direction opposite to the first direction from the second end of the first wall, and
the first L-shaped wall is configured to reduce directed path and vertical diffraction from the array of first antenna elements, wherein the first L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction towards the first antenna panel.

### Claim 10 (depends on 9)

The electronic device of claim 9, wherein:
the plurality of walls of the antenna isolator further includes a second L-shaped wall positioned between the T-shaped wall and the second antenna panel, and
the second L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction towards the second antenna panel.

### Claim 11 (depends on 10)

The electronic device of claim 10, wherein:
the antenna isolator further includes a third L-shaped wall positioned between the first L-shaped wall and the T-shaped wall,
the third L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction away from the T-shaped wall,
a fourth L-shaped wall positioned between the second L-shaped wall and the T-shaped wall, and
the fourth L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction away from the T-shaped wall.

### Claim 12 (depends on 10)

The electronic device of claim 10, wherein:
lengths of extensions from the substrate of first and second walls of the first L-shaped wall are selected as a function of a resonance frequency of the first antenna panel to reduce diffraction from the first antennal panel,
lengths of extensions from the substrate of first and second walls of the second L-shaped wall are selected as a function of a resonance frequency of the second antenna panel to reduce diffraction from the second antennal panel, and
a distance between the first and second L-shaped walls is selected as a function of a resonance frequency of the first antenna panel to reduce a port-to-port coupling.

### Claim 13 (depends on 8)

The electronic device of claim 8, wherein the antenna isolator further includes a resistive film applied to a surface of the antenna isolator.

### Claim 14 (depends on 8)

The electronic device of claim 8, further comprising a ground plane coupled to the antenna isolator,
wherein slots are etched into the ground plane to suppress a surface current.

### Claim 15

A method of using an antenna, the method comprising:
providing signals to a first antenna panel including an array of first antenna elements coupled to a substrate;
receiving signals from a second antenna panel including an array of second antenna elements coupled to the substrate; and
reducing wave propagation between the array of first antenna elements and the array of second antenna elements using an antenna isolator coupled on the substrate, the antenna isolator comprising a plurality of walls extending outwardly from the substrate along a length of the substrate between the first antenna panel and the second antenna panel, wherein the plurality of walls includes:
a T-shaped wall configured to reduce horizontal diffraction that extends along the length of the substrate from a first end of the substrate to a second end of the substrate, and
a first L-shaped wall positioned between the T-shaped wall and the first antenna panel that extends along the length of the substrate from the first end of the substrate to the second end of the substrate.

### Claim 16 (depends on 15)

The method of claim 15, wherein:
the T-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate,
a second wall that extends in a first direction from a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate, and
a third wall that extends in a second direction opposite to the first direction from the second end of the first wall, and
the first L-shaped wall is configured to reduce directed path and vertical diffraction from the array of first antenna elements, wherein the first L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction towards the first antenna panel.

### Claim 17 (depends on 16)

The method of claim 16, wherein:
the plurality of walls of the antenna isolator further includes a second L-shaped wall positioned between the T-shaped wall and the second antenna panel, and
the second L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction towards the second antenna panel.

### Claim 18 (depends on 17)

The method of claim 17, wherein:
the antenna isolator further includes a third L-shaped wall positioned between the first L-shaped wall and the T-shaped wall,
the third L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the first direction away from the T-shaped wall,
a fourth L-shaped wall positioned between the second L-shaped wall and the T-shaped wall, and
the fourth L-shaped wall includes:
a first wall that extends outwardly from the substrate along the length of the substrate, and
a second wall that extends at a second end of the first wall that is opposite to a first end of the first wall adjacent to the substrate in the second direction away from the T-shaped wall.

### Claim 19 (depends on 17)

The method of claim 17, wherein:
lengths of extensions from the substrate of first and second walls of the first L-shaped wall are selected as a function of a resonance frequency of the first antenna panel to reduce diffraction from the first antennal panel,
lengths of extensions from the substrate of first and second walls of the second L-shaped wall are selected as a function of a resonance frequency of the second antenna panel to reduce diffraction from the second antennal panel, and
a distance between the first and second L-shaped walls is selected as a function of a resonance frequency of the first antenna panel to reduce a port-to-port coupling.

### Claim 20 (depends on 15)

The method of claim 15, wherein the antenna isolator further includes a resistive film applied to a surface of the antenna isolator.