# US 12,009,591 B2 · Electromagnetic band gap structure (EBG)

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- Number: US 12,009,591 B2
- Document ID: US12009591B2
- Status: Granted
- Kind: B2
- Application number: 17/488,560
- Filed: 2021-09-29
- Published: 2022-01-20
- Granted: 2024-06-11
- Earliest claimed: 2020-01-30
- Assignees: Aptiv Technologies AG
- Applicants: Aptiv Technologies AG
- Inventors: Ryan K. Rossiter; Mingjian Li; Jun Yao
- Web page: https://patentgrep.com/patent/US12009591B2

## CPC

- H01P 1/2005: {Electromagnetic photonic bandgaps [EPB], or photonic bandgaps [PBG]}
- H01Q 1/521: {reducing the coupling between adjacent antennas}
- H01Q 1/525: {between emitting and receiving antennas}
- H01Q 5/30: Arrangements for providing operation on different wavebands
- H01Q 21/061: {Two dimensional planar arrays}
- H01Q 21/28: Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)}
- H01Q 13/206: {Microstrip transmission line antennas}
- H01Q 13/22: Longitudinal slot in boundary wall of waveguide or transmission line {(H01Q13/203 takes precedence)}
- H01Q 21/0043: {Slotted waveguides (combination with horns H01Q13/0233)}
- H01Q 21/0075: {Stripline fed arrays (H01Q21/065 takes precedence)}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An electromagnetic band-gap (EBG) structure includes an antenna substrate layer, first conductive regions, and second conductive regions. The antenna substrate includes a first planar surface and a second planar surface. The first conductive regions are located on the first planar surface of the antenna substrate and separated from adjacent first conductive regions by a first distance. The second conductive regions are located on the first planar surface of the antenna substrate and are separated from the first conductive regions by a second distance and wherein the second conductive regions at least partially surround the first conductive regions.

## Claims

### Claim 1

An electromagnetic band-gap (EBG) array comprising:
an antenna substrate layer having a first, planar surface and a second, planar surface located opposite the first, planar surface;
a first conductive layer formed on top of the first planar surface of the antenna substrate layer; and
a plurality of H-shaped slots formed within an interior of the first conductive layer, each H-shaped slot in the first conductive layer exposing the first, planar surface of the antenna substrate layer; and
wherein the plurality of H-shaped slots are arranged in a region between adjacent antennas to block surface waves between the adjacent antennas.

### Claim 2 (depends on 1)

The EBG array of claim 1, wherein the H-shaped slot includes a first slot, a second slot, and a third slot perpendicular to the first and second slots, wherein the third slot extends between a middle portion of the first and second slots.

### Claim 3 (depends on 2)

The EBG array of claim 2, wherein the first slot has a first width, the second slot has a second width, and the third slot has a third width.

### Claim 4 (depends on 3)

The EBG array of claim 3, wherein the first width, the second width and the third width are equal.

### Claim 5 (depends on 3)

The EBG array of claim 3, wherein the first slot and the second slot are separated by a first length, wherein the first length is greater than the first width and the second width.

### Claim 6 (depends on 1)

The EBG array of claim 1, wherein the conductive layer is a top conductive layer and further including a bottom conductive layer located adjacent to the second, continuously planar surface, wherein the first conductive layer is separated from the bottom conductive layer by the antenna substrate layer.

### Claim 7 (depends on 1)

The EBG array of claim 1, wherein the EBG array has a length and a height, wherein the first slot and the second slot extend along at least a portion of the length and wherein the third slot extends along at least a portion of the height, wherein the length is greater than the width.

### Claim 8 (depends on 1)

The EBG array of claim 1, wherein the adjacent antennas are formed in the first conductive layer exposing the first planar surface of the antenna substrate layer, and wherein the adjacent antennas and the plurality of H-shaped slots are formed by etching the first conductive layer at the same time.

### Claim 9 (depends on 1)

The EBG array of claim 1, wherein the plurality of H-shaped slots are not electrically coupled to an additional conductive layer in the antenna substrate layer or on the second planar surface of the antenna substrate layer.

### Claim 10

A planar antenna board comprising:
an antenna substrate layer having a first, planar surface and a second, planar surface opposite the first planar surface;
a conductive layer located on the first planar surface;
a first antenna fabricated in the top conductive layer;
a second antenna fabricated in the top conductive layer;
a array of H-shaped electromagnetic band-gap (EBG) structures formed within an interior of the conductive layer, the array of H-shaped EBG structures located in a region between the first antenna and the second antenna, wherein each H-shaped EBG structure includes a plurality of slots formed in the conductive layer, wherein the periodic array of H-shaped EBG structures blocks surface waves between the first antenna and the second antenna, each H-shaped EBG structure formed in the top conductive layer exposing the first planar surface of the antenna substrate layer.

### Claim 11 (depends on 10)

The planar antenna board of claim 10, wherein the H-shaped EBG structures of the EBG array include a first slot, a second slot, and a third slot perpendicular to the first and second slots, wherein the third slot extends between a middle portion of the first and second slots.

### Claim 12 (depends on 11)

The planar antenna board of claim 11, wherein the first slot has a first width, the second slot has a second width, and the third slot has a third width.

### Claim 13 (depends on 12)

The planar antenna board of claim 12, wherein the first width, the second width and the third width are equal.

### Claim 14 (depends on 12)

The planar antenna board of claim 12, wherein the first slot and the second slot are separated by a first length, wherein the first length is greater than the first width and the second width.

### Claim 15 (depends on 10)

The planar antenna board of claim 10, wherein the planar antenna board is a multiple input multiple output (MIMO) antenna board.

### Claim 16 (depends on 15)

The planar antenna board of claim 15, wherein both the first antenna and the second antenna are transmitting antennas.

### Claim 17 (depends on 15)

The planar antenna board of claim 15, wherein both the first antenna and the second antenna are receiving antennas.

### Claim 18 (depends on 15)

The planar antenna board of claim 15, wherein the first antenna is a receiving antenna and the second antenna is a transmitting antenna.

### Claim 19 (depends on 10)

The planar antennas of claim 10, wherein the second antenna is offset in the x-y-plane from the first antenna.

### Claim 20

A method, comprising:
providing an antenna substrate layer having a first, planar surface and a second, planar surface located opposite the first, planar surface;
forming a conductive layer located on the first planar surface;
forming a first antenna fabricated in the top conductive layer;
forming a second antenna fabricated in the top conductive layer;
forming an array comprising a plurality of H-shaped electromagnetic band-gap (EBG) structures arranged in a region between the first antenna and the second antenna within an interior of the conductive layer, each H-shaped EBG structure formed in the top conductive layer exposing the first planar surface of the antenna substrate layer, wherein the array of H-shaped EBG structures blocks surface waves between the first antenna and the second antenna.