ANTENNA STRUCTURE FOR WIRELESS COMMUNICATION DEVICE

• US 20080284659A1
• Filed: 05/13/2008
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Inventors: Ikeyama, Masahiro
• Granted Patent: US 8,022,879 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: B60R 25/2063 Ignition switch geometry
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: 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

Abstract

An antenna structure for a wireless communication device including a substrate having a first surface that supports an electronic component and a second surface opposite to the first surface. The antenna structure includes a first surface pattern formed on the first surface of the substrate. A second surface pattern is formed on the second surface of the substrate. The second surface pattern is at least partially separated from the first surface pattern in a direction perpendicular to a thicknesswise direction of the substrate.

Claims

1. An antenna structure for a wireless communication device including a substrate having a predetermined thickness, a first surface that supports an electronic component, and a second surface opposite to the first surface, the antenna structure comprising:

a first surface pattern formed on the first surface of the substrate; and

a second surface pattern formed on the second surface of the substrate, wherein the second surface pattern is at least partially separated from the first surface pattern in a direction perpendicular to a thicknesswise direction of the substrate.

2. The antenna structure according to claim 1, wherein the second surface pattern at least partially extends parallel to the first surface pattern at a location separated from the first surface pattern in the direction perpendicular to the thicknesswise direction of the substrate.

3. The antenna structure according to claim 1, wherein the second surface pattern at least partially extends inclined at an acute angle relative to the first surface pattern.

4. The antenna structure according to claim 1, wherein:

the first surface pattern includes a first pattern portion and a second pattern portion extending from the first pattern portion at a generally right angle; and

the second surface pattern includes a third pattern portion, which is connected to the second pattern portion of the first surface pattern, and a fourth pattern portion, which extends from the third pattern portion, with the third pattern portion extending inclined at an acute angle relative to the second pattern portion, and the fourth pattern portion extending parallel to the first pattern portion at a location separated from the first pattern portion in the direction perpendicular to the thicknesswise direction of the substrate.

5. The antenna structure according to claim 1, wherein:

the first surface pattern includes a first pattern portion; and

the second surface pattern includes a second pattern portion, which is connected to the first pattern portion of the first surface pattern, a third pattern portion, which extends from the second pattern portion, and a fourth pattern portion, which extends from the third pattern portion, with the second pattern portion extending at a generally right angle relative to the first pattern portion, the third pattern portion extending inclined at an acute angle relative to the second pattern portion, and the fourth pattern portion extending parallel to the first pattern portion at a location separated from the first pattern portion in the direction perpendicular to the thicknesswise direction of the substrate.

6. The antenna structure according to claim 1, wherein the first surface pattern includes a first pattern portion and a second pattern portion extending from the first pattern portion, with the second pattern portion extending inclined at an acute angle relative to the first pattern portion.

7. A wireless key for performing wireless communication with a communication subject, the wireless key comprising:

an operation unit which generates a wireless signal when operated by a user;

a substrate which is connected to the operation unit and which supports an electronic component;

an antenna which is printed onto the substrate and which is capable of transmitting the wireless signal;

wherein the substrate includes a predetermined thickness, a first surface that supports the electronic component, and a second surface opposite to the first surface; and

the antenna includes a first surface pattern formed on the first surface of the substrate and a second surface pattern formed on the second surface of the substrate, with the second surface pattern at least partially separated from the first surface pattern in a direction perpendicular to a thicknesswise direction of the substrate.

8. The wireless key according to claim 7, wherein the antenna is formed on the substrate at a location separated from the antenna in the thicknesswise direction of the substrate.

9. The wireless key according to claim 7, wherein the second surface pattern at least partially extends parallel to the first surface pattern at a location separated from the first surface pattern in the direction perpendicular to the thicknesswise direction of the substrate.

10. The wireless key according to claim 7, wherein the second surface pattern at least partially extends inclined at an acute angle relative to the first surface pattern.

11. The wireless key according to claim 7, wherein:

the first surface pattern includes a first pattern portion and a second pattern portion extending from the first pattern portion at a generally right angle; and

the second surface pattern includes a third pattern portion, which is connected to the second pattern portion of the first surface pattern, and a fourth pattern portion, which extends from the third pattern portion, with the third pattern portion extending inclined at an acute angle relative to the second pattern portion, and the fourth pattern portion extending parallel to the first pattern portion at a location separated from the first pattern portion in the direction perpendicular to the thicknesswise direction of the substrate.