# US 10,122,074 B2 · Antenna device using EBG structure, wireless communication device, and radar device

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- Number: US 10,122,074 B2
- Document ID: US10122074B2
- Status: Granted
- Kind: B2
- Application number: 14/883,368
- Filed: 2015-10-14
- Published: 2016-05-19
- Granted: 2018-11-06
- Earliest claimed: 2014-11-19
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Hiroyoshi Tagi; Hideki Iwaki
- Web page: https://patentgrep.com/patent/US10122074B2

## CPC

- H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)}
- G01S 7/032: {Constructional details for solid-state radar subsystems}
- H01Q 1/521: {reducing the coupling between adjacent antennas}
- H01Q 1/525: {between emitting and receiving antennas}
- H01Q 15/006: {Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces}
- H01Q 15/008: {said selective devices having Sievenpipers' mushroom elements}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

An antenna device comprises a dielectric substrate that has first and second surfaces; first and second antenna elements that are arranged on the first surface of the dielectric substrate; a ground conductor that is arranged on the second surface of the dielectric substrate; and an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate. The electromagnetic band gap structure comprises: a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor; and at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.

## Claims

### Claim 1

An antenna device comprising:
a dielectric substrate that has first and second surfaces;
first and second antenna elements that are arranged on the first surface of the dielectric substrate;
a ground conductor that is arranged on the second surface of the dielectric substrate; and
an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate,
the electromagnetic band gap structure comprising:
a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor; and
at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.

### Claim 2 (depends on 1)

The antenna device according to claim 1, wherein
the plurality of patch conductors are arranged in a plurality of columns that extend to intersect a hypothetical line that joins the first and second antenna elements, and
the electromagnetic band gap structure further comprises a plurality of via conductors that each pass through the dielectric substrate and connect the plurality of patch conductors to the ground conductor.

### Claim 3 (depends on 2)

The antenna device according to claim 2, wherein
the at least one opening comprises, in at least one column from among the plurality of columns of the patch conductors, at least one slit that opposes a portion between each of at least one pair of the patch conductors that are mutually adjacent in the column.

### Claim 4 (depends on 2)

The antenna device according to claim 2, wherein
the at least one opening comprises at least one slit that opposes a portion between at least one pair of the patch conductors that are mutually adjacent between each of at least one pair of columns that are mutually adjacent from among the plurality of columns of the patch conductors.

### Claim 5 (depends on 2)

The antenna device according to claim 2, wherein
the at least one opening comprises:
at least one slit that opposes a portion between each of at least one pair of the patch conductors that are mutually adjacent in at least one column from among the plurality of columns of the patch conductors; and
at least one slit that opposes a portion between each of at least one pair of columns that are mutually adjacent from among the plurality of columns of the patch conductors.

### Claim 6 (depends on 1)

The antenna device according to claim 1, wherein
the electromagnetic band gap structure comprises a plurality of stub conductors that are arranged on the first surface of the dielectric substrate, and
the plurality of stub conductors are connected to the plurality patch conductors and are electromagnetically coupled with the ground conductor.

### Claim 7 (depends on 6)

The antenna device according to claim 6, wherein
the at least one opening comprises a plurality of openings that each oppose corresponding one of the plurality of stub conductors.

### Claim 8 (depends on 6)

The antenna device according to claim 6, wherein
the at least one opening comprises a plurality of openings that each oppose corresponding one of the plurality of patch conductors.

### Claim 9 (depends on 6)

The antenna device according to claim 6, wherein
the at least one opening comprises a plurality of openings that oppose at least part of the plurality of stub conductors to form a mesh-shape.

### Claim 10 (depends on 6)

The antenna device according to claim 6, wherein
the at least one opening comprises a plurality of openings that oppose at least part of the plurality of patch conductors to form a mesh-shaped openings.

### Claim 11

A wireless communication device comprising:
an antenna device; and
a wireless communication circuit that uses the antenna device to transmit and receive wireless signals,
the antenna device comprising:
a dielectric substrate that has first and second surfaces;
first and second antenna elements that are arranged on the first surface of the dielectric substrate;
a ground conductor that is arranged on the second surface of the dielectric substrate; and
an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate, and
the electromagnetic band gap structure comprising:
a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor; and
at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.

### Claim 12

A radar device comprising:
an antenna device; and
a radar transmission and reception circuit that uses the antenna device to transmit and receive radar waves,
the antenna device comprising:
a dielectric substrate that has first and second surfaces;
first and second antenna elements that are arranged on the first surface of the dielectric substrate;
a ground conductor that is arranged on the second surface of the dielectric substrate; and
an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate, and
the electromagnetic band gap structure comprising:
a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor; and
at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.