Antenna for tire pressure monitoring wheel electronic device

• US 20030164799A1
• Filed: 12/17/2002
• Published: 09/04/2003
• Est. Priority Date: 03/01/2002
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Nantz, John S., Ghabra, Riad, King, Ronald O., Tang, Qingfeng
• Granted Patent: US 6,933,898 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0493 for attachment on the tyre
• CPC Class Codes: H01Q 1/2241 used in or for vehicle tyres
• CPC Class Codes: H01Q 1/325 characterised by the location of the antenna on the vehicle
• CPC Class Codes: 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
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H03B 5/326 the resonator being an acoustic wave device, e.g. SAW or BAW device
• CPC Class Codes: H03C 1/46 Modulators with mechanically-driven or acoustically-driven parts

Abstract

An antenna system for a radio frequency (RF) electronic device includes a printed circuit board (PCB), a ground plane, and an active element. The PCB may have a top surface and a bottom surface. The ground plane may be on the bottom surface. The active element may be mounted on the top surface. The active element includes a first segment positioned in a top surface plane and connected to a second segment oriented perpendicular to the top surface.

Claims

1. An antenna system for a radio frequency (RF) electronic device, the system comprising:

a printed circuit board (PCB) having a top surface and a bottom surface;

a ground plane on the bottom surface; and

an active element mounted on the top surface, wherein the active element comprises a first segment positioned in a top surface plane and connected to a second segment oriented perpendicular to the top surface.

2. The system of claim 1 wherein the bottom surface of the PCB is mounted on or near a metal object.

3. The system of claim 2 wherein the electronic device comprises a tire pressure monitoring system and the metal object comprises a wheel rim.

4. The system of claim 1 wherein first segment is “

C”

or “

U”

shaped.

5. The system of claim 1 wherein second segment is “

C”

or “

U”

shaped.

6. The system of claim 1 wherein second segment comprises an arch.

7. The system of claim 1 wherein the system further comprises a tuning capacitance connected between the first segment and the ground plane.

8. The system of claim 1 wherein the system further comprises an input/output connection at an end of the second segment opposite the first segment for connection to the electronic device.

9. For use in a vehicle tire pressure monitoring electronic device, an antenna system comprising:

a printed circuit board (PCB) having a top surface and a bottom surface;

a ground plane on the bottom surface; and

an active element mounted on the top surface, wherein the active element comprises a first segment positioned in a top surface plane and connected to a second segment oriented perpendicular to the top surface, and the bottom surface is mounted on or near a wheel rim.

10. The system of claim 9 wherein first segment is “

C”

or “

U”

shaped.

11. The system of claim 9 wherein second segment is “

C”

or “

U”

shaped.

12. The system of claim 9 wherein the second segment comprises an arch.

13. The system of claim 9 wherein the system further comprises a tuning capacitance connected between the first segment and the ground plane.

14. The system of claim 9 wherein the system further comprises an input/output connection at an end of the second segment opposite the first segment for connection to the electronic device.

15. For use in a vehicle tire pressure monitoring system, a method of reducing coupling between an antenna and a metal object, the method comprising:

providing a printed circuit board (PCB) having a top surface and a bottom surface;

providing a ground plane on the bottom surface;

mounting an active element on the top surface, wherein the active element comprises a first segment positioned in a top surface plane and connected to a second segment oriented perpendicular to the top surface; and

mounting the bottom surface on or near a wheel rim.

16. The method of claim 15 wherein first segment is “

C”

or “

U”

shaped.

17. The method of claim 15 wherein second segment is “

C”

or “

U”

shaped.

18. The method of claim 15 wherein second segment comprises an arch.

19. The method of claim 15 further comprising providing a tuning capacitance connected between the first segment and the ground plane.

20. The method of claim 15 further comprising providing an input/output connection at an end of the second segment opposite the first segment.