Diagnostic device for an antenna
AssigneeSiemens VDO Automotive Corporation
InventorJacques Rocher
Life of this patent
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Abstract
A diagnostic device for an antenna includes a coil (20) or the like connected on the one hand to a reference potential and on the other hand to the output of an amplifier (12), including two condensers (C2, C3) mounted in series, a first condenser (C2) being mounted in parallel with the coil (20) and the second condenser (C3) being inserted between a terminal of the coil (20) and the reference potential. The device is configured for the detection of the presence of an antenna in a hands free automotive vehicle system.
Claims13
Diagnostic device for an antenna (2), comprising:
- a coil (20) connected on the one hand to a reference potential and on the other hand to the output of an amplifier (12),
- first and second condensers (C2, C3) mounted in series, the first condenser (C2) being mounted in parallel to the coil (20) and the second condenser (C3) being inserted between a terminal of the coil (20) and the reference potential.
Diagnostic device for an antenna (2) comprising:
- a coil (20) connected on one end to a reference potential and on another end to an output of an amplifier (12);
- and
- two condensers (C2, C3) mounted in series, a first of the condensers (C2) being mounted in parallel to the coil (20) and the second of the condensers (C3) being inserted between a terminal of the coil (20) and the reference potential, wherein,
- the capacitance of the first condenser (C2) mounted in parallel to the coil is at least five times less than the capacitance of the second condenser (C3) inserted between the coil (20) and the reference potential.
Diagnostic device for an antenna (2) comprising:
- a coil (20) connected on one end to a reference potential and on another end to an output of an amplifier (12);
- two condensers (C2, C3) mounted in series, a first of the condensers (C2) being mounted in parallel to the coil (20) and the second of the condensers (C3) being inserted between a terminal of the coil (20) and the reference potential;
- a third condenser (C1) mounted between the amplifier (12) and the first coil (20), wherein,
- the capacitance of the third condenser (C1) is substantially equal to the capacitance of the second condenser,
- the capacitance of the first condenser is comprised between 1 and 100 nF, and
- the capacitances of the second (C3) and third (C1) condensers are comprised between 0.5 and 10 μF.
Dependencies are inferred from the claim text.