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US 12,241,923 B2Granted
Electrically small self-resonant electro-quasistatic exciter and detector with canceled magnetic field
AssigneeCalifornia Institute of Technology
InventorsDarmindra D. Arumugam, Jack D. Bush
Life of this patent
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Abstract
An electrically small electroquasistatic antenna having a structure that reduces radiated magnetic fields and maintains suitable radiated electrical fields. The electroquasistatic antenna is a dipole antenna that is electrically short, which presents as a capacitor for use as an electroquasistatic antenna, with one or multiple counterposed inductive elements to resonate the antenna and provide high efficiency while simultaneously canceling the external magnetic fields. The electroquasistatic antenna may be configured for operation as an electroquasistatic exciter or electroquasistatic detector.
Claims9
A method for electroquasistatic excitation comprising:
- generating electrical energy from a radio-frequency generator;
- electrically coupling the electrical energy to a plurality of inductive elements, whereby the plurality of inductive elements generate a radiated magnetic field and a radiated electric field, the plurality of inductive elements comprising a first helix of conductive elements wound around a first arm of an antenna and a second helix of conductive elements wound around a second arm of the antenna, the first arm being opposite the second arm, the first helix being wound in a direction opposite a winding of the second helix;
- and
- configuring the plurality of inductive elements to reduce the radiated magnetic field by driving the first arm differentially from the second arm by a differential center feed between the first arm and the second arm;
- wherein electrically coupling the electrical energy to the plurality of inductive elements comprises:
- coupling the electrical energy to a first plurality of inductive elements, whereby the first plurality of inductive elements generate a first magnetic dipole moment and a first electric dipole moment;
- coupling the electrical energy to a second plurality of inductive elements, whereby the second plurality of inductive elements generate a second magnetic dipole moment and a second electric dipole moment;
- and
- wherein configuring the plurality of inductive elements comprises:
- configuring the first plurality of inductive elements and the second plurality of inductive elements to reduce a magnetic field resulting from a combination of the first magnetic dipole moment and the second magnetic dipole moment.
7 more elements
A method of electroquasistatic detection comprising:
- electrically coupling electrical energy from a plurality of inductive elements to a radio frequency detector, whereby the plurality of inductive elements are configured to receive an electromagnetic field having a received magnetic field and a received electric field, the plurality of inductive elements comprise a first helix of conductive elements wound around a first arm of an antenna and a second helix of conductive elements wound around a second arm of the antenna, the first helix being wound in a direction opposite a winding of the second helix and the first arm being opposite the second arm;
- and
- configuring the plurality of inductive elements to reduce the received magnetic field by driving the first arm differentially from the second arm by a differential center feed between the first arm and the second arm;
- and generating or detecting an electric dipole moment on the radio frequency detector;
- wherein electrically coupling electrical energy from the plurality of inductive elements to the radio frequency detector comprises:
- coupling electrical energy from a first plurality of inductive elements, whereby the first plurality of inductive elements receive the electromagnetic field having a first magnetic moment component and a first electric moment component;
- coupling electrical energy from a second plurality of inductive elements;
- whereby the second plurality of inductive elements receive the electromagnetic field having a second magnetic moment component and a second electric moment component;
- and
- wherein configuring the plurality of inductive elements to reduce the received magnetic field comprises:
- configuring the first plurality of inductive elements and the second plurality of inductive elements to reduce a received magnetic moment resulting from a combination of the first magnetic moment component and the second magnetic moment component.
8 more elements
Dependencies are inferred from the claim text.