Vehicle door handle assembly with antenna circuit

• US 9,871,288 B2
• Filed: 10/31/2016
• Issued: 01/16/2018
• Est. Priority Date: 06/10/2013
• Status: Active Grant

• Current Assignee: Magna Mirrors of America Incorporated (Magna International Incorporated)
• Original Assignee: Magna Mirrors of America Incorporated (Magna International Incorporated)
• Inventors: Dykhouse, Robert J.
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US15/338,780
• Publication Number:
  US 20170047648A1
• Time in Patent Office: 442 Days
• CPC Class Codes: H01Q 1/3241 particular used in keyless entry systems
• CPC Class Codes: H01Q 1/3283 side-mounted antennas, e.g. bumper-mounted, door-mounted mounted on windscreens H01Q1/1271
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence

Abstract

A vehicular door handle system includes a door handle assembly for a door of a vehicle. The door handle assembly includes a door handle portion that is graspable by a user to open the vehicle door. The door handle assembly includes an antenna circuit for a passive entry system of the vehicle. The antenna circuit includes at least an inductor in series electrical connection with a capacitor. The antenna circuit includes a resistor in series electrical connection with the inductor of the antenna circuit and the capacitor of the antenna circuit. The series electrical connection includes one of (i) the resistor being disposed between the inductor and the capacitor of the antenna circuit and (ii) the resistor not being disposed between the inductor and the capacitor of the antenna circuit. The resistor functions to reduce the Q factor of the antenna circuit.

Claims

1. A vehicular door handle system, said door handle system comprising:

a door handle assembly for a door of a vehicle, said door handle assembly configured to mount at a handle region of the vehicle door;

said door handle assembly comprising a door handle portion that is graspable by a user to open the vehicle door;

said door handle assembly comprising an antenna circuit for a passive entry system of the vehicle, said antenna circuit comprising at least an inductor in series electrical connection with a capacitor;

wherein said antenna circuit comprises a resistor in series electrical connection with said inductor of said antenna circuit and said capacitor of said antenna circuit;

wherein said series electrical connection comprises one of (i) said resistor being disposed between said inductor and said capacitor of said antenna circuit and (ii) said resistor not being disposed between said inductor and said capacitor of said antenna circuit; and

wherein said resistor functions to reduce the Q factor of said antenna circuit.

2. The vehicular door handle system of claim 1, wherein the passive entry system comprises a passive entry passive start system.

3. The vehicular door handle system of claim 1, wherein said door handle portion comprises a non-metallic door handle portion.

4. The vehicular door handle system of claim 3, wherein said door handle portion comprises a painted door handle portion.

5. The vehicular door handle system of claim 1, wherein said resistor functions to reduce the Q factor of said antenna circuit by at least 50 percent.

6. The vehicular door handle system of claim 1, wherein said resistor functions to reduce the Q factor of said antenna circuit by 75 percent.

7. The vehicular door handle system of claim 1, wherein said antenna circuit is disposed within said door handle portion that is graspable by a user to open the vehicle door.

8. The vehicular door handle system of claim 7, wherein said door handle assembly includes a lighting element operable for illuminating said door handle portion.

9. The vehicular door handle system of claim 7, wherein said capacitor of said antenna circuit is disposed on a circuit board and wherein said resistor is disposed on said circuit board.

10. A vehicular door handle system, said door handle system comprising:

a door handle assembly for a door of a vehicle, said door handle assembly configured to mount at a handle region of the vehicle door;

said door handle assembly comprising a door handle portion that is graspable by a user to open the vehicle door;

said door handle assembly comprising an antenna circuit for a passive entry system of the vehicle, said antenna circuit comprising at least an inductor in series electrical connection with a capacitor;

wherein said antenna circuit comprises a resistor in series electrical connection with said inductor of said antenna circuit and said capacitor of said antenna circuit;

wherein said series electrical connection comprises said resistor not being disposed between said inductor and said capacitor of said antenna circuit;

wherein said resistor functions to reduce the Q factor of said antenna circuit;

wherein said door handle portion comprises a non-metallic door handle portion; and

wherein said door handle portion comprises a painted door handle portion.

11. The vehicular door handle system of claim 10, wherein said antenna circuit is disposed within said door handle portion that is graspable by a user to open the vehicle door.

12. The vehicular door handle system of claim 11, wherein said door handle assembly includes a lighting element operable for illuminating said door handle portion.

13. The vehicular door handle system of claim 10, wherein said capacitor of said antenna circuit is disposed on a circuit board and wherein said resistor is disposed on said circuit board.

14. The vehicular door handle system of claim 13, wherein said resistor functions to reduce the Q factor of said antenna circuit by at least 50 percent.

15. The vehicular door handle system of claim 13, wherein said resistor functions to reduce the Q factor of said antenna circuit by 75 percent.

16. A vehicular door handle system, said door handle system comprising:

a door handle assembly for a door of a vehicle, said door handle assembly configured to mount at a handle region of the vehicle door;

said door handle assembly comprising a door handle portion that is graspable by a user to open the vehicle door;

said door handle assembly comprising an antenna circuit for a passive entry system of the vehicle, said antenna circuit comprising at least an inductor in series electrical connection with a capacitor;

wherein said antenna circuit comprises a resistor in parallel electrical connection with at least one of said inductor of said antenna circuit and said capacitor of said antenna circuit;

wherein said resistor functions to reduce the Q factor of said antenna circuit;

wherein said door handle portion comprises a non-metallic door handle portion;

wherein said door handle portion comprises a painted door handle portion; and

wherein said antenna circuit is disposed within said door handle portion that is graspable by a user to open the vehicle door.

17. The vehicular door handle system of claim 16, wherein said door handle assembly includes a lighting element operable for illuminating said door handle portion.

18. The vehicular door handle system of claim 17, wherein said capacitor of said antenna circuit is disposed on a circuit board and wherein said resistor is disposed on said circuit board.

19. The vehicular door handle system of claim 18, wherein said resistor functions to reduce the Q factor of said antenna circuit by at least 50 percent.

20. The vehicular door handle system of claim 16, wherein said resistor functions to reduce the Q factor of said antenna circuit by 75 percent.