Reducing orientation directivity and improving operating distance of magnetic sensor coils in a magnetic field
First Claim
1. An apparatus for passive keyless entry (PKE) comprising magnetic field sensors having improved read range at a plurality of different positional orientations within a magnetic field, comprising:
- a plurality of magnetic field sensor coils, each one of said plurality of magnetic field sensor coils having a coil axis, wherein the coil axis of each one of said plurality of magnetic field sensor coils are non-perpendicular and non-parallel to the other axes.
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Accused Products
Abstract
In a passive keyless entry (PKE) system, a PKE key-fob has magnetic sensor coils arranged in non-perpendicular and non-parallel orientations therebetween, resulting in a more uniform omnidirectional pickup pattern when sensing a time varying magnetic field source from an interrogator base station of the PKE system. The magnetic sensor coils may also be stagger tuned to reduce frequency resonance change due to mutual inductance coupling interaction and/or create a desired magnetic field frequency response pickup pattern. Reducing null zones of different orientations of the PKE key-fob results in more uniform and reliable operation of the PKE system, and tuning the magnetic sensors to operate within the correct frequency and bandwidth of the interrogation magnetic signal increases the useful operating range of the PKE key-fob.
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Citations
26 Claims
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1. An apparatus for passive keyless entry (PKE) comprising magnetic field sensors having improved read range at a plurality of different positional orientations within a magnetic field, comprising:
a plurality of magnetic field sensor coils, each one of said plurality of magnetic field sensor coils having a coil axis, wherein the coil axis of each one of said plurality of magnetic field sensor coils are non-perpendicular and non-parallel to the other axes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of improving read range of magnetic field sensors for a plurality of different positional orientations within a magnetic field, said method comprising the step of:
positioning a plurality of magnetic field sensor coils so that an axis of each one of said plurality of magnetic field sensor coils are non-perpendicular and non-parallel to the other axes. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for passive keyless entry (PKE) comprising magnetic field sensors having improved read range at a plurality of different positional orientations within a magnetic field, said system comprising:
a passive keyless entry (PKE) transponder comprising a plurality of magnetic field sensor coils, each one of said plurality of magnetic field sensor coils having a coil axis, wherein the coil axis of each one of said plurality of magnetic field sensor coils are non-perpendicular and non-parallel to the other axes. - View Dependent Claims (25, 26)
Specification