Two-axis, single output magnetic field sensing antenna
First Claim
1. An antenna assembly for sensing a time-varying magnetic field having a predetermined frequency, said antenna assembly comprising:
- a first element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said first element including at least one inductor; and
a second element in electrical communication with said first element, said second element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said second element sensing axis being orthogonal to said first element sensing axis, either of said first element sensing axis and said first element transverse axis being parallel with said second element transverse axis, said second element not magnetically coupled to said first element, said second element including at least one inductor, said first element and said second element being serially connected thereby producing an antenna assembly having a single pair of output leads.
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Accused Products
Abstract
A passive, non-multiplexed, two-axis antenna for sensing time-varying magnetic fields of a particular carrier frequency at a second point in space as produced by a electromagnetic field generator located at a first point in space. The antenna has a particular sensitive plane and produces a single output signal having amplitude proportionally related to the magnitude of the incident magnetic field'"'"'s vector projection onto the antenna'"'"'s sensitive plane. If the phase of the magnetic field is known, then the antenna'"'"'s signal is processed to obtain the incident magnetic field'"'"'s vector components. The antenna enables the realization of two- or three-axis magnetic field receivers with reduced signal processing complexity, cost and power requirements.
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Citations
28 Claims
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1. An antenna assembly for sensing a time-varying magnetic field having a predetermined frequency, said antenna assembly comprising:
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a first element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said first element including at least one inductor; and
a second element in electrical communication with said first element, said second element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said second element sensing axis being orthogonal to said first element sensing axis, either of said first element sensing axis and said first element transverse axis being parallel with said second element transverse axis, said second element not magnetically coupled to said first element, said second element including at least one inductor, said first element and said second element being serially connected thereby producing an antenna assembly having a single pair of output leads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An antenna assembly for sensing a time-varying magnetic field having a predetermined frequency, said antenna assembly comprising:
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a first element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said first element being a parallel LCR circuit, including at least one inductor, at least one resistor, and at least one capacitor; and
a second element in electrical communication with said first element, said second element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said second element sensing axis being orthogonal to said first element sensing axis, either of said first element sensing axis and said first element transverse axis being parallel with said second element transverse axis, said second element being a parallel LCR circuit, including at least one inductor, at least one resistor, and at least one capacitor, said first element and said second element being serially connected thereby producing an antenna assembly having a single pair of output leads. - View Dependent Claims (16)
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17. An antenna assembly for sensing a time-varying magnetic field having a predetermined frequency, said antenna assembly comprising:
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an enclosure;
a first element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said first element including a plurality of inductors serially connected and disposed along two opposing edges of said enclosure, each of said first element plurality of inductors being oriented parallel to each other; and
a second element in electrical communication with said first element, said second element having a sensing axis producing an amplitude response to the magnetic field and a transverse axis orthogonal to said sensing axis, said second element sensing axis being orthogonal to said first element sensing axis, either of said first element sensing axis and said first element transverse axis being parallel with said second element transverse axis, said second element including a plurality of inductors serially connected and disposed along two opposing edges of said enclosure, each of said second element plurality of inductors being oriented parallel to each other and orthogonal to each of said first element plurality of inductors, said first element and said second element being serially connected thereby producing an antenna assembly having a single pair of output leads.
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18. An antenna assembly for sensing a time-varying magnetic field having a signal frequency, said antenna assembly comprising:
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a first element including a first magnetic core member and a first coil wound around said first magnetic core member, said first coil having a first end and a second end, said first element forming an inductance-resistance-capacitance resonant circuit having a resonant frequency;
a second element including a second magnetic core member and a second coil wound around said second magnetic core member, said second coil having a first end and a second end, said second element disposed substantially perpendicular to said first element, said second element not magnetically coupled to said first element, said second coil first end in communication with said first coil second end, said second element forming an inductance-resistance-capacitance resonant circuit having a resonant frequency; and
an output defined by said first coil first end and said second coil second end. - View Dependent Claims (19, 20, 21, 22)
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23. An antenna assembly for producing a two-dimensional response to a time-varying magnetic field at a single output, said antenna assembly comprising:
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a first element producing an amplitude response to the magnetic field, said first element having a longitudinal axis defining a sensing axis, said first element having a resonant frequency; and
a second element producing an amplitude response to the magnetic field, said second element having a longitudinal axis defining a sensing axis, said second element sensing axis being orthogonal to said first element sensing axis, said second element sensing axis not intersecting with said first element, said second element being in serial electrical communication with said first element, said second element having a resonant frequency, wherein the magnetic field produces a time domain phase response in each of said first element and said second element, said first element time domain phase response being offset from said second element time domain phase response by an odd integer multiple of approximately 90 degrees. - View Dependent Claims (24, 25, 26)
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27. An antenna assembly for sensing a time-varying magnetic field having a signal frequency, said antenna assembly comprising:
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a first element including a first magnetic core member and a first coil wound around said first magnetic core member, said first coil having a first end and a second end, said first element having a resonant frequency;
a second element having a resonant frequency and including a second magnetic core member and a second coil wound around said second magnetic core member, said second coil having a first end and a second end, said second element disposed substantially perpendicular to said first element, said second coil first end in communication with said first coil second end, wherein the magnetic field produces a time domain phase response in each of said first element and said second element, said first element time domain phase response being offset from said second element time domain phase response by an odd integer multiple of approximately 90 degrees; and
an output defined by said first coil first end and said second coil second end. - View Dependent Claims (28)
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Specification