Dielectric antenna

• US 20030184480A1
• Filed: 03/26/2003
• Published: 10/02/2003
• Est. Priority Date: 03/26/2002
• Status: Active Grant

• Current Assignee: NGK Spark PLUG Company Limited
• Original Assignee: NGK Spark PLUG Company Limited
• Inventors: Shibata, Masaki
• Granted Patent: US 6,801,167 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/045 with particular feeding means for circular polarisation H01Q9/0428

Abstract

A dielectric antenna includes a plate-shaped dielectric substrate, a radiation electrode provided on a first main surface of the dielectric substrate so as to cover the first main surface except for a peripheral portion thereof, and a ground electrode formed on the entirety of a second main surface of the dielectric substrate. A feed electrode extends through the dielectric substrate from the first main surface to the second main surface. A feed point of the feed electrode is electrically connected to the radiation electrode. A plurality of through-hole electrodes providing an electrical shield are formed in a peripheral portion of the dielectric substrate so as to surround the radiation electrode, the through-hole electrodes being connected to the ground electrode. Alternatively, instead of the through-hole electrodes, the dielectric antenna may include a shield electrode formed on a side surface of the dielectric substrate and connected to the ground electrode.

Claims

1. A dielectric antenna comprising:

a plate-shaped dielectric substrate having first and second main surfaces;

a radiation electrode provided on the first main surface of the dielectric substrate so as to cover the first main surface apart from a peripheral portion thereof;

a ground electrode formed on the entirety of the second main surface of the dielectric substrate;

a feed electrode extending through the dielectric substrate from the first main surface to the second main surface, a feed point of the feed electrode being electrically connected to the radiation electrode; and

a plurality of through-hole electrodes formed in a peripheral portion of the dielectric substrate so as to surround the radiation electrode, the through-hole electrodes being connected to the ground electrode.

2. A dielectric antenna according to claim 1, wherein the dielectric substrate is of a substantially rectangular shape as viewed from the first main surface, and the plurality of through-hole electrodes include through-hole electrodes formed along each side of the dielectric substrate with substantially constant spacing therebetween.

3. A dielectric antenna according to claim 2, wherein one corner portion of the dielectric substrate is chamfered at a chamfer angle;

the radiation electrode is of a substantially rectangular shape corresponding to the rectangular shape of the dielectric substrate; and

a first corner portion of the radiation electrode corresponding to the chamfered corner portion of the dielectric substrate and a second corner portion of the radiation electrode diagonally opposite the first corner portion are each cut at an angle equal to the chamfer angle of the chamfered corner portion of the dielectric substrate.

4. A dielectric antenna according to claim 1, wherein the feed electrode is disposed at a position offset from a center of the dielectric substrate as viewed from the first main surface.

5. A dielectric antenna comprising:

a plate-shaped dielectric substrate having first and second main surfaces;

a radiation electrode provided on the first main surface of the dielectric substrate so as to cover the first main face apart from a peripheral portion thereof;

a ground electrode formed on the entirety of the second main surface of the dielectric substrate;

a feed electrode extending through the dielectric substrate from the first main surface to the second main surface, a feed point of the feed electrode being electrically connected to the radiation electrode; and

a shield electrode formed on a side surface of the dielectric substrate and connected to the ground electrode.

6. A dielectric antenna according to claim 5, wherein the dielectric substrate is of a substantially rectangular shape as viewed from the first main surface;

and a substantially rectangular shield electrode is formed on each of four side surfaces of the dielectric substrate.

7. A dielectric antenna according to claim 6, wherein the shield electrode is connected to the ground electrode through one side of the shield electrode, and the remaining sides of the shield electrode are separated from corresponding sides of the corresponding side surface.

8. A dielectric antenna according to claim 6, wherein the shield electrode is connected to the ground electrode through one side of the shield electrode, and the remaining sides of the shield electrode extend to corresponding sides of the corresponding side surface of the dielectric substrate, so that the shield electrodes on the four side surfaces are laterally connected to one another.

9. A dielectric antenna according to claim 6, wherein one corner portion of the dielectric substrate is chamfered at a chamfer angle;

the radiation electrode is of a substantially rectangular shape corresponding to the rectangular shape of the dielectric substrate; and

a first corner portion of the radiation electrode corresponding to the chamfered corner portion of the dielectric substrate and a second corner portion of the radiation electrode diagonally opposite the first corner portion are each cut at an angle equal to the chamfer angle of the chamfered corner portion of the dielectric substrate.

10. A dielectric antenna according claim 5, wherein the feed electrode is provided at a position offset from a center of the dielectric substrate as viewed from the first main surface.