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US 9,791,585 B2Granted
Constant phase
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsDaniel Charles Heinz, Adam William Melber, Thomas Albert Burst, Michael Leonard Brennan, Michael Steer
Life of this patent
Estimating the term…
Abstract
Various embodiments are described that relate to a loop with a constant phase. The loop can function as an antenna and be used in object detection. A current source can be used to power the loop such that the loop produces a magnetic field and an electric field. The magnetic field can be powerful enough to detect a dielectric while the electric field is so small that it does not interfere with nearby communication equipment. Thus, detection can occur without disruption of other important devices.
Claims20
A singular loop antenna, comprising:
- a first wire section;
- a second wire section that is distinct from the first wire section;
- a third wire section that is distinct from the first wire section and distinct from the second wire section, where the first wire section and the third wire section are not contiguous;
- a first reactive compensation element that divides the first wire section from the second wire section;
- and
- a second reactive compensation element that divides the second wire section from the third wire section and that is distinct from the first reactive compensation element,
- where the first wire section, the second wire section, the third wire section, the first reactive compensation element, and the second reactive compensation element form at least part of a loop powered by a current of at least two amps supplied from a low impedance current source,
- where the singular loop antenna, when supplied with the current, produces a magnetic field that is substantially greater than an electric field along a longitudinal axis of the singular loop antenna,
- where the first reactive compensation element offsets an impedance of the first wire section,
- where the second reactive compensation element offsets an impedance of the second wire section,
- where a magnitude is kept substantially constant throughout the loop such that a magnitude change is not greater than that which is produced by no more than one of the wire sections, and
- where a phase is kept substantially constant throughout the loop such that a phase change is not greater than that which is produced by no more than one of the wire sections.
9 more elements
A singular loop antenna, comprising:
- a first wire section;
- a second wire section that is distinct from the first wire section;
- a third wire section that is distinct from the first wire section and distinct from the second wire section, where the first wire section and the third wire section are not contiguous;
- a first reactive compensation element that divides the first wire section from the second wire section;
- and
- a second reactive compensation element that divides the second wire section from the third wire section and that is distinct from the first reactive compensation element,
- where the first wire section, the second wire section, the third wire section, the first reactive compensation element, and the second reactive compensation element form at least part of a loop powered by a current of at least two amps supplied from a low impedance current source,
- where the singular loop antenna, when supplied with the current, produces a magnetic field and an electric field,
- where the magnetic field is substantially greater than the electric field along a longitudinal axis of the singular loop antenna,
- where the first reactive compensation element offsets an impedance of the first wire section,
- where the second reactive compensation element offsets an impedance of the second wire section,
- where a magnitude is kept substantially constant throughout the loop such that the magnitude change is not greater than that which is produced by no more than one of the wire sections,
- where a phase is kept substantially constant throughout the loop such that the phase change is not greater than that which is produced by no more than one of the wire sections, and
- where a frequency of the singular loop antenna is between about 1 Megahertz to about 1 Gigahertz.
11 more elements
A singular small loop antenna operating at less than about one-quarter of a wavelength, comprising:
- a first wire section;
- a second wire section that is distinct from the first wire section;
- a third wire section that is distinct from the first wire section and distinct from the second wire section, where the first wire section and the third wire section are not contiguous;
- a first reactive compensation element that divides the first wire section from the second wire section;
- and
- a second reactive compensation element that divides the second wire section from the third wire section and that is distinct from the first reactive compensation element,
- where the first wire section, the second wire section, the third wire section, the first reactive compensation element, and the second reactive compensation element form at least part of a loop powered by a current of at least two amps supplied from a low impedance current source,
- where the singular small loop antenna, when supplied with the current, produces a magnetic field that is substantially greater than an electric field along a longitudinal axis of the singular small loop antenna,
- where the first reactive compensation element offsets an impedance of the first wire section,
- where the second reactive compensation element offsets an impedance of the second wire section,
- where a magnitude is kept substantially constant throughout the loop such that the magnitude change is not greater than that which is produced by no more than one of the wire sections,
- where a phase is kept substantially constant throughout the loop such that the phase change is not greater than that which is produced by no more than one of the wire sections.
9 more elements
Dependencies are inferred from the claim text.