EP2775565A1 - Mehrlagige Drahtstruktur für hochwirksame Drahtloskommunikation - Google Patents

Mehrlagige Drahtstruktur für hochwirksame Drahtloskommunikation Download PDF

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Publication number
EP2775565A1
EP2775565A1 EP13001130.7A EP13001130A EP2775565A1 EP 2775565 A1 EP2775565 A1 EP 2775565A1 EP 13001130 A EP13001130 A EP 13001130A EP 2775565 A1 EP2775565 A1 EP 2775565A1
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EP
European Patent Office
Prior art keywords
wire
conductor
layer
frequency
layers
Prior art date
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EP13001130.7A
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English (en)
French (fr)
Inventor
SINGH Vinit
A. Frysz Christine
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Nucurrent Inc
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Nucurrent Inc
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Priority to EP19188841.1A priority Critical patent/EP3579338A1/de
Priority to EP13001130.7A priority patent/EP2775565A1/de
Publication of EP2775565A1 publication Critical patent/EP2775565A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the present subject matter generally relates to methods, systems and apparatus to design, operate and manufacture wireless power and/or data transmission and/or communication systems, and more specifically, to methods, systems and apparatus to design, operate and manufacture a high efficiency structure for use in near-field wireless power and/or data transmission and/or communication systems.
  • skin effect is the tendency of an alternating electric current (AC) to distribute itself within a conductor such that the current density is more predominant near the surface of the conductor with the remaining conductor body 'unused' relative to electrical current flow.
  • the remaining conductor body is 'unused' relative to electrical current flow because the current density typically decays with distance therewithin away from the surface of the conductor.
  • the electric current flows mostly near the surface, and is referred to as the "skin" of the conductor.
  • the depth at which current flows from the surface is referred to as the "skin depth.”
  • the "skin depth" then defines the electrical signal conducting path that is active in transmission and/or communication, while the conductor is defined as the body that is capable of conducting an electrical signal.
  • the skin effect phenomenon generally causes energy loss as current flows through the wire used in creating a structure like an antenna, a circuit, a lumped element like an inductor, capacitor and resistor or any combinations thereof.
  • Higher resistive loss at high frequencies is a problem faced by most electronic devices or appliances. Skin effect becomes more prevalent when operating frequency increases. With higher frequencies, current that normally flows through the entire cross section of the wire forming the structure becomes restricted to its surface. As a result, the effective resistance of the wire is similar to that of a thinner wire rather than of the actual diameter through which the current could be distributed.
  • a wire exhibiting tolerable resistance for efficient performance at low frequency transitions into a wire of unacceptable resistance at high frequency.
  • IMDs Implanted Medical Devices
  • pacemakers defibrillators and neuromodulation or neuromuscular stimulation devices
  • neuromuscular stimulation devices there is a desire to minimize battery recharge time.
  • Faster battery recharge time reduces, for example, patient duration of discomfort, inconvenience, and potential for injury.
  • the wireless componentry like antennas or circuits including lumped elements have less resistive losses, battery recharge could be accomplished from greater distances and with higher tolerance to misalignment or disorientation of the devices engaging in the wireless communication without compromising performance. Precise orientation and alignment is known to be difficult to achieve, especially for obese patients.
  • structures of smaller sizes can be designed and practically manufactured while maintaining the performance characteristics required for successful system operation, then the overall dimensions of IMD's could be decreased.
  • read range is at most three feet which is generally insufficient for pallet tracking.
  • Ultra high frequency readers enable greater read distances of eight to ten feet, however, they introduce other performance issues like signals that are reflected by metal or are absorbed by water, or display unreadable, null spots in read fields.
  • Increased read range requires concentrated power to facilitate reflecting back the signal for better performance, hence, a more efficient structure could help solve these issues.
  • Litz wires were developed, in part, in an attempt to address the issues discussed above.
  • Litz wires are generally insufficient for use in high frequency applications, and are therefore generally not useful in applications having operating frequencies above about 3 MHz.
  • a Litz wire is a wire consisting of a number of individually insulated magnet wires twisted or braided into a uniform pattern, so that each wire strand tends to take all possible positions in the cross-section of the entire conductor.
  • This multi-strand configuration or Litz construction is designed to minimize the power losses exhibited in solid conductors due to "skin effect".
  • Litz wire constructions attempt to counteract this effect by increasing the amount of surface area without significantly increasing the size of the conductor.
  • even properly constructed Litz wires exhibit some skin effect due to the limitations of stranding.
  • Wires intended for higher frequency ranges generally require more strands of a finer gauge size than Litz wires of equal cross-sectional area but composed of fewer and larger strands.
  • the highest frequency at which providers of Litz wires offer configurations capable of improving efficiencies is about 3 MHz. There is currently no solution for applications with operating frequencies beyond this 3 MHz maximum frequency limit.
  • the teachings herein alleviate one or more of the above noted problems of higher resistive losses at high frequencies resulting in lower quality factors by utilizing the multi-layer wire concept to increase the area of conductance within a structure.
  • the multi-layer wire configuration is the fundamental building block that reduces the resistance of a conducting interconnect that carries a time-varying current at a frequency or frequencies.
  • the multi-layer wire configuration of the present invention results in a reduction of conductor loss and an increase in the quality factor of the structure.
  • the present teachings apply to wireless transmission and/or communication for near-field energy transfer, power transfer, data transfer or combinations thereof. More specifically, the present teachings apply to wireless transmission and/or communication for near-field energy networks, power networks or data networks, including any and all combinations of such networks.
  • the present teachings apply to diverse componentry for wireless transmission and/or communication for near-field energy applications wherein reduction in energy losses are sought for interconnects between two points in a circuit, coils used in componentry in a circuit like but not limited to an inductor, a capacitor, and a resistor or any combinations thereof, coils used in but not limited to an antenna, a resonator, and the like, in any structure such as but not limited to a planar inverted F antenna (PIFA) and its derivatives, a rectangular microstrip antenna or Patch antenna and its derivatives, ultra wideband (UWB) structures, monopole structures, bow-tie structures and the like, or any combination thereof.
  • PIFA planar inverted F antenna
  • UWB ultra wideband
  • Wireless energy transfer or wireless power transmission is the transmission of electrical energy from a power source to an electrical load without interconnecting wires.
  • efficiency is a significant parameter, as the transmission signal must arrive at the receiver or receivers to make the system practical.
  • the most common form of wireless transmission involving energy, power, or data transfer is carried out using direct induction followed by resonant magnetic induction. Other methods currently being considered include electromagnetic radiation.
  • wireless energy reception or wireless power reception is the reception of electrical energy from a power source without interconnecting wires.
  • efficiency is a significant parameter, as the reception of a signal must be received from a transmitter or transmitters to make the system practical.
  • the forms of wireless reception embodying energy, power or data can be carried out using direct induction, resonant magnetic induction as well as electromagnetic radiation
  • the embodiments of the present invention are capable of wireless communication of electrical energy, electrical power and/or data without interconnecting wires.
  • Wireless communication embodies the transmission and/or reception of electrical energy, electrical power or data either simultaneously or independently.
  • the resonator mitigates the unwanted high frequency skin effect by introducing non-conducting dielectric layers within its wire, resulting in a structure that comprises layers of conducting material alternating with layers of non-conducting material.
  • the multi-layer wire structure effectively provides an increased number of surfaces each with its characteristic skin depth and all electrically, or otherwise, connected.
  • the skin depth may range from approximately one-half of the conductor depth to about equal to the conductor depth.
  • the conductor depth may be in the range of skin depth to twice the skin depth. However, depending on the available technology, costs, and application, the conductor depth may be as large as twenty times or more the skin depth.
  • the resonator includes a wire coil having at least one turn wherein the wire coil is made up of a multi-layer wire.
  • the multi-layer wire may include a first and second conductive layer separated by a layer of insulating material.
  • the conductive layers may have substantially the same thickness and/or depth, wherein the thickness and/or depth may be in the range of skin depth to twice the skin depth. However, depending on the available technology, costs, and application, the conductor thickness and/or depth may be as large as twenty times or more the skin depth.
  • Each conductive layer may be electrically connected to each other using at least one method of interconnect, such as but not limited to a via, a solder, a tab, a wire, a pin, or a rivet.
  • the non-conducting layer is to insulate two different conducting layers.
  • the most basic design of the non-conducting layer would ideally be as thin as the manufacturing process practically permits, while still providing sufficient insulating properties.
  • the thickness of layers is dictated by the "core thickness" and the pre-preg thickness.
  • the thickness of the non-conducting layer is selected to modify the electrical behavior of the structure.
  • the resonator may have a quality factor greater than 100. Preferably, the quality factor is greater than 350. Most preferably, the quality factor is greater than 600. It will be apparent to those skilled in the art that systems requiring two resonators may either have resonators with equal and even similar quality factors. Also, it will be apparent to one skilled in the art that systems requiring two resonators may utilize resonators where one resonator has a quality factor substantially different from the other. The quality factor selection for each resonator will depend on the application, the design specification for each and the intended use of each resonator. It is understood that traditional inductively coupled systems utilize resonators with a quality factor around 30.
  • the quality factor of a resonator may be dependent on the environment in which it is used, so, for example, a resonator that has a quality factor of 100 in air, may only have a quality factor of 50 when implanted in human or animal tissue.
  • the multi-layer wire structure described herein should outperform traditional resonators.
  • the reduction of losses in the multi-layer wire and the significantly reduced internal resistance of the resonator could enable high efficiency, extended range, compact wireless systems that consume less energy, have longer run time and simplify operation without compromising events like overheating.
  • a structure created using the multi-layer wire concept for wireless transmission or wireless reception is designed to wirelessly transmit and/or receive electrical energy, electromagnetic energy, and/or electrical power.
  • the structure is capable of electronic data transmission.
  • the structure is capable of transmitting and/or receiving a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • the structure may comprise a plurality of conductor layers, an insulator layer separating each of the conductor layers, and at least one connector connecting two or more of the conductor layers.
  • Each of the plurality of conductor layers may have at least one turn and may further be placed in a parallel orientation.
  • Each conductor layer may be formed from an electrically conductive material.
  • the electrically conductive material may be comprised of copper titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material and any combination thereof.
  • the conductor layer may have a cross-sectional shape, such as, but not limited to, a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, or an elliptical cross-section.
  • the connector connecting the conductor layers may be but is not limited to a via, a solder, a tab, a wire, a pin, or a rivet.
  • the structure may have structural shape, such as but not limited to a circular solenoidal configuration, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, and a conformal solenoid configuration.
  • Other configurations may be used to modify the electrical properties of the structure.
  • An electrical resistance in the structure may be reduced when an electrical signal is induced in the resonator at a frequency.
  • the frequency may be selected from a frequency range from about 1 MHz to about 10 GHz. Further, the frequency may be a frequency band that ranges from or is within about 1 MHz to about 10 GHz.
  • the electrical signal may be an electrical current, an electrical voltage, a digital data signal or any combination thereof.
  • the frequency may also be selected from a frequency range from about 100 kHz to about 10 GHz. Further, the frequency may be a frequency band that ranges from or is within about 100 kHz to about 10 GHz.
  • a resonator for wireless transmission or wireless reception.
  • the resonator is designed using the multi-layer wire concept to wirelessly transmit and/or receive electrical energy, electromagnetic energy, and electrical power.
  • the resonator is capable of electronic data transmission or reception.
  • the resonator is capable of transmitting and/or receiving a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • the resonator may comprise a plurality of conductors, each conductor having a conductor length, a conductor height, a conductor depth, and a conductive surface having a certain skin depth at the specified operating frequency.
  • the skin depth may range from approximately one-half of the conductor depth to about equal to the conductor depth.
  • the conductor depth may be in the range of skin depth to twice the skin depth. However, depending on the available technology, costs, and application, the conductor depth may be as large as twenty times or more the skin depth.
  • the plurality of conductor layers may have at least one turn. Further, each of the plurality of conductor layers may or may not have substantially the same conductor length, conductor height, or conductor depth.
  • the conductor layers may be formed from an electrically conductive material.
  • the electrically conductive material may be comprised of copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material and any combination thereof.
  • the plurality of conductors may be arranged to form a resonator body.
  • the resonator body may have a resonator body length, a resonator body width and a resonator body depth.
  • an electrical signal When an electrical signal is induced through the resonator body, the electrical signal propagates through the conducting surface.
  • the electrical signal may be an electrical current, an electrical voltage, a digital data signal or any combination thereof.
  • the plurality of conductors in the resonator may comprise a first conductor layer and a second conductor layer separated by an insulator layer wherein the first conductor layer is connected to the second conductor layer or more by at least one connector.
  • the conductor may have a cross-sectional shape, such as but not limited to a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, or an elliptical cross-section.
  • the resonator may have a structural shape such as but not limited to a circular solenoidal, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, or a conformal solenoid configuration.
  • the circuit is designed to wirelessly transmit and/or receive electrical energy, electromagnetic energy, and electrical power.
  • the circuit is capable of electronic data transmission.
  • the circuit is capable of transmitting a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • Circuits at high frequencies extensively use passive elements such as inductors, capacitors, and the like.
  • Some examples of such circuit configurations include but are not limited to band pass, high pass and low pass filters; mixer circuits (e.g., Gilbert Cell); oscillators such as Colpitts, Pierce, Hartley, and clap; and, amplifiers such as differential, push pull, feedback, and radio-frequency (RF).
  • inductors are also used in matching and feedback in low noise amplifiers (LNAs) as a source degeneration element.
  • LNAs low noise amplifiers
  • Lumped inductors are also essential elements in RF circuits and monolithic microwave integrated circuits (MMICs). Lumped inductors are used in on-chip matching networks where transmission line structures may be of excessive length.
  • passive circuit element and lumped element such as lumped inductor, may be used interchangeably with passive circuit element being the broader term.
  • the passive circuit element may be an inductor, a capacitor, a resistor all created using the multi-layer wire or the passive circuit element may just be a multi-layer wire. In nearly all the above mentioned circuit examples, not meant to be limiting, it is desired that the passive components are minimally lossy.
  • an embodiment is given using but is not limited to an inductor created using the multi-layer wire concept.
  • the wire structure designs should be such that maximum Q is attained while achieving the desired inductance value. In other words, the resistive loss in the inductor needs to be minimized.
  • the inductor can be implemented as, but not limited to, a TEM/transmission line, a conductive loop, or a spiral/solenoid/combination structure of several shapes, for example, but not limited to, a circle, a rectangle, an ellipsoid, a square, or an irregular configuration. All these embodiments, not meant to be limiting, may be realized using the multi-layer structure in the present invention.
  • a resonator created using the multi-layer wire concept, as part of a larger circuit is discussed.
  • a resonator is a device or a system that exhibits resonance (i.e., oscillates) at specific frequency, frequencies, or frequency band(s), called the resonance frequency, frequencies, or frequency band(s).
  • the resonance frequency frequencies, or frequency band(s)
  • electrical circuits there is minimum electrical impedance at the resonance frequency, frequencies, or frequency band(s).
  • the multi-layer wire structure of the present invention may act as a resonator under two fundamental conditions: (1) When the multi-layer wire structure is designed to resonate at a specific frequency, frequencies, or frequency band(s), in its environment without any additional electrical components; (2) When the multi-layer wire structure is designed to resonate at a specific frequency, frequencies, or frequency band(s), in its environment in combination with other components (for example, but not limited to, a capacitor, a capacitor bank, a capacitor and/or an inductor network).
  • the resonator may be part of a larger circuit, and the resonance behavior may be designed to occur at a frequency, frequencies, or frequency band(s), or at a frequency, frequencies, or frequency band(s) with a certain bandwidth or certain bandwidths.
  • Additional components either conventional or created using the multi-layer wire concept (e.g., a resistor) may also be added to alter the bandwidth(s).
  • a resistor e.g., a resistor
  • any of the conventional wireless technology components may be used in combination with wireless technology components created using the multi-layer wire concept to elicit the required efficiency and performance for these wireless applications.
  • the system is designed to wirelessly transmit and/or receive electrical energy, electromagnetic energy, and electrical power.
  • the system is capable of electronic data transmission.
  • the system is capable of transmitting a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • the system may comprise a first resonator comprising a plurality of first conductors, each first conductor having a first conductor length, a first conductor height, a first conductor depth, and a first conductive surface having a first skin depth.
  • the plurality of first conductors may be arranged to form a first resonator body having a first resonator body length, a first resonator body width and a first resonator body depth.
  • the system may also include a second resonator comprising a plurality of second conductors, each second conductor having a second conductor length, a second conductor height, a second conductor depth, and a second conductive surface having a second skin depth.
  • the plurality of second conductors may be arranged to form a second resonator body having a second resonator body length, a second resonator body width and a second resonator body depth.
  • the first skin depth and the second skin depth may be approximately one-half of the conductor depth to about equal to the conductor depth.
  • the first and second conductors may have at least one turn and each of the plurality of first and second conductor layers may or may not have substantially the same conductor length, conductor height, and conductor depth.
  • the first conductor depth and the second conductor depth may be in the range of skin depth to twice the skin depth. However, depending on the available technology, costs, and application, the first conductor depth and the second conductor depth may be as large as twenty times or more the skin depth.
  • the first and second conductor layers may be formed from an electrically conductive material such as, but not limited to, copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material and any combination thereof.
  • an electrically conductive material such as, but not limited to, copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material and any combination thereof.
  • the electrical signal When an electrical signal is propagated through the first resonator body, the electrical signal propagates through the first conducting surface and further induces an electrical signal through the second resonator body. The induced electrical signal propagates through the second conducting surface.
  • the electrical signal may be an electrical current, an electrical voltage, and a digital data signal, or combinations thereof.
  • the plurality of first conductors may comprise a first conductor layer and a second conductor layer separated by an insulator layer wherein the first conductor layer is connected to the second conductor layer or more by at least one connector.
  • the connector connecting the conductor layers may be, but is not limited to, a via, a solder, a tab, a wire, a pin, or a rivet.
  • the first conductor may have a first cross-sectional shape and the second conductor may have a second cross-sectional shape.
  • the first and the second cross-sectional shapes are non-limiting and may be one of a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, or an elliptical cross-section.
  • the first resonator may have a first structural shape and the second resonator may have a second structural shape.
  • the first and the second structural shapes are non-limiting and may be a circular solenoidal configuration, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, or a conformal solenoid configuration.
  • a structure comprising a plurality of conductor layers, including an insulator layer separating each of the conductor layers.
  • An electrical resistance is reducible when an electrical signal is propagated through the conductor layers at a frequency.
  • the conductor layer may be a conductive wire, conductive tape, a conductive ribbon, or a deposited metal.
  • the conductor may include a connector that connects two or more of the conductor layers.
  • the connector may be a solder, a tab, a wire, a pin, and a rivet.
  • the frequency may be within the range of between about 100 kHz to about 3 MHz.
  • the frequency may be also be within the range of between about 3 MHz to about 10 GHz.
  • the frequency may be in a frequency band that is within the range of about 100 kHz to about 3 MHz.
  • the frequency may be in a frequency band that is within the range of about 3 MHz to about 10 GHz.
  • the frequency may also be within the frequency range of between 100 kHz to 10 GHz.
  • the frequency may also be a frequency band that is within the range of 100 kHz to 10 GHz.
  • the plurality of conductor layers may be in a parallel orientation.
  • the plurality of conductor layers may be connected electrically in parallel.
  • the plurality of conductive layers connected electrically in parallel may be connected electrically in series with second plurality of conductive layers connected electrically in parallel.
  • the electrical signal may be at least one of an energy signal, a power signal, and a data signal.
  • the electrical signal may be at least one of an electrical current, an electrical voltage, and a digital data signal.
  • the structure may have a quality factor greater than 100.
  • the structure may have a cross-sectional shape including at least one of a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, and an elliptical cross-section.
  • the structure may have a structural shape including at least one of a circular solenoidal configuration, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, and a conformal solenoid configuration.
  • the plurality of conductor layers may have at least one turn.
  • the conductor layer may be formed from an electrically conductive material.
  • the electrically conductive material may be copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal, or a biocompatible material.
  • the insulator layer may be formed from an electrically insulative material.
  • the electrically insulative material may be air, Styrofoam, silicon dioxide, a suitable biocompatible ceramic or any similar dielectric with a low permittivity, a non-conductive dielectric with a high permittivity, or a ferrite material.
  • the structure may be incorporated within a device having at least one of a resonator, an antenna, an RFID tag, an RFID transponder, and a medical device.
  • a wire structure comprising a plurality of conductors, each conductor having a conductor length, a conductor height, a conductor depth and a conductor surface having a skin depth.
  • the plurality of insulators are positioned between each of the plurality of conductors such that each of the insulators is positioned between adjacent conductors of the plurality of conductors.
  • the wire structure is formed to be capable of propagating an electrical signal through the skin depth of the conductor surface.
  • the plurality of conductors comprise a first conductor layer and a second conductor layer separated by an insulator layer therebetween wherein the first conductor layer is connected to the second conductor layer by at least one connector.
  • At least one of the first and second conductor layers comprises at least one a conductive tape, a conductive ribbon, and a deposited metal.
  • the connector may be at least one of a via, a solder, a tab, a wire, a pin, and a rivet.
  • the conductor may have a cross-sectional shape comprising at least one of a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, and an elliptical cross-section.
  • the electrical signal may comprise at least one of an energy signal, a power signal, and a data signal.
  • the electrical signal may be an electrical current, an electrical voltage, and a digital data signal.
  • the skin depth ranges from approximately one-half of the conductor depth to about equal to the conductor depth.
  • the conductor depth ranges from skin depth to about twice the skin depth.
  • the conductor depth is greater than about twice the skin depth.
  • the plurality of conductor layers has at least one turn.
  • each of the plurality of conductor layers has substantially the same conductor length, conductor height, or conductor depth.
  • the wire structure has a quality factor greater than 100.
  • the wire structure has a structural shape which may be a circular solenoidal configuration, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, or a conformal solenoid configuration.
  • the at least one conductor may be formed from an electrically conductive material.
  • the electrically conductive material comprises at least one of copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal, and a biocompatible material.
  • the insulator may be formed from an electrically insulative material.
  • the electrically insulative material comprises at least one of air, Styrofoam, silicon dioxide, a suitable biocompatible ceramic or any similar dielectric with a low permittivity, a non-conductive dielectric with a high permittivity, and a ferrite material.
  • the electrical signal is inducible through the structure at least one frequency.
  • the frequency is selected from a frequency range from about 100 kHz to about 3 MHz.
  • the frequency is selected from a frequency range from about 3 MHz to about 10 GHz.
  • the frequency is a frequency band that is within the range of about 100 kHz to about 3 MHz.
  • the frequency is a frequency band that is within the range of about 1 MHz to about 10 GHz.
  • the wire structure further includes a circuit element selected from a group consisting of a resistor, an inductor, and a capacitor.
  • the wire structure may be incorporated within a device comprising at least one of a resonator, an antenna, an RFID tag, an RFID transponder and a medical device.
  • a method for manufacturing a structure for wireless transmission or wireless reception wherein the structure itself and/or the componentry for the structure are created using the multi-layer wire concept.
  • the method of manufacturing creates a structure that is capable of wirelessly transmitting and/or receiving electrical energy, electromagnetic energy, and electrical power.
  • the resulting structure is capable of electronic data transmission or reception.
  • the resulting structure is capable of transmitting and/or receiving a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • the method may comprise the steps of creating a plurality of conductor layers having an insulator between each of the conductor layers and forming at least one connection between two of the plurality of conductors.
  • the connector connecting the conductor layers may be but is not limited to a via, a solder, a tab, a wire, a pin, or a rivet.
  • the conductor layers may be created by depositing through a mask.
  • the step of creating a plurality of conductor layers having an insulator between each of the conductor layers may further include the steps of placing a first conductive layer on top of a second conductive layer and separating the first conductive layer from the second conductive layer with a first insulator.
  • the step of forming at least one connection between two of the plurality of conductors may include the steps of connecting at least two of the conductive layers comprising but not limited to a via, a solder, a tab, a wire, a pin, or a rivet.
  • the conductor layers may be formed from an electrically conductive material.
  • the electrically conductive material may be comprised of copper, titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material and any combination thereof.
  • the method comprises the steps of providing a structure that is capable of wireless transmission and/or wireless reception of electrical energy, electromagnetic energy, and/or electrical power.
  • the method provides the steps of providing a structure that is capable of electronic data transmission or reception.
  • the method provides the steps of providing a structure that is capable of transmitting and/or receiving a combination of electrical energy, electromagnetic energy, electrical power and electronic data together or separately.
  • the method comprises the steps of providing a plurality of conductors, each conductor having a conductor length, a conductor height, a conductor depth, and a conductive surface having a skin depth.
  • the conductor depth may be in the range of skin depth to twice the skin depth. However, depending on the available technology, costs, and application, the conductor depth may be as large as twenty times or more the skin depth.
  • the plurality of conductors may be arranged to form a resonator body having a resonator body length, a resonator body width and a resonator body depth; and, inducing an electrical signal in at least one of the plurality of conductors such that the electrical signal propagates through the conducting surface of the skin depth.
  • the electrical signal may be an electrical current, an electrical voltage, a digital data signal or any combination thereof.
  • the method may also include the step of providing a second plurality of conductors, each of the second conductors having a second conductor length, a second conductor height, a second conductor depth, and a second conductive surface having a second skin depth wherein the plurality of second conductors are arranged to form a second resonator body having a second resonator body length, a second resonator body width and a second resonator body depth.
  • the electrical signal propagates through the conducting surface of the skin depth and further induces an electrical signal through the second resonator body, and the induced electrical signal propagates through the second conducting surface at the second skin depth.
  • the plurality of conductors may comprise a first conductor layer and a second conductor layer separated by an insulator layer wherein the first conductor layer is connected to the second conductor layer by at least one connector.
  • the at least one connection connecting at least two of the conductive layers comprises but is not limited to a via, a solder, a tab, a wire, a pin, or a rivet.
  • the conductor may have a cross-sectional shape not limited to a circular cross-section, a rectangular cross-section, a square cross-section, a triangular cross-section, and an elliptical cross-section.
  • the plurality of conductor layers may have at least one turn and each of the plurality of conductor layers may or may not have substantially the same conductor length, conductor height, and conductor depth.
  • the conductor layer may be formed from an electrically conductive material.
  • the electrically conductive material may be comprised of copper titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys, stainless steel, gold, a gold alloy, palladium, carbon, silver, a noble metal or a biocompatible material or any combination thereof.
  • the resonator may have a structural shape not limited to a circular solenoidal configuration, a square solenoidal configuration, a circular spiral configuration, a square spiral configuration, a rectangular configuration, a triangular configuration, a circular spiral-solenoidal configuration, a square spiral-solenoidal configuration, and a conformal solenoid configuration.
  • FIG. 1 illustrates energy loss in a low efficiency system
  • FIG. 2 illustrates an AC current distribution for a steady unidirectional current through a homogeneous conductor
  • FIG. 3 illustrates an AC current distribution at increased frequency due to skin effect
  • FIG. 4 is a graph of skin depth vs. frequency
  • FIG. 5 illustrates AC current distribution through a multi-layer wire at increased frequency
  • FIG. 6 illustrates a high-level diagram of a wire structure for wireless communication
  • FIG. 7A illustrates an example of a wire in a circular solenoidal configuration
  • FIG. 7B illustrates an example of a wire in a square solenoidal configuration
  • FIG. 7C illustrates an example of a wire in a circular spiral configuration
  • FIG. 7D illustrates an example of a wire in a square spiral configuration
  • FIG. 7E illustrates an example of a wire in a multi-layer square spiral configuration
  • FIG. 7F illustrates an example of a wire in a circular spiral-solenoidal configuration
  • FIG. 7G illustrates an example of a wire in a square spiral-solenoidal configuration
  • FIG. 7H illustrates an example of a wire in a conformal solenoid configuration
  • FIG. 8A illustrates an example of a single turn circular coil having N layers
  • FIG. 8B illustrates an example of a double turn circular spiral-solenoidal coil of N layers
  • FIG. 9A illustrates an example of a multi-layer wire having a circular cross-section
  • FIG. 9B illustrates an example of a multi-layer wire having a rectangular cross-section
  • FIG. 9C illustrates an example of a multi-layer wire having a square cross-section
  • FIG. 9D illustrates an example of a multi-layer wire having a triangular cross-section
  • FIG. 9E illustrates an example of a multi-layer wire having an elliptical cross-section
  • FIG. 9F illustrates a rectangular cross-section of a multi-layer wire
  • FIG. 10A illustrates a multi-layer wire having a circular cross-section
  • FIG. 10B illustrates a multi-layer wire having a rectangular cross-section
  • FIG. 11A shows a single turn MLMT structure having 1 layer
  • FIG. 11B shows a single turn MLMT structure having 11 layers
  • FIG. 11C shows a single turn MLMT structure having 20 layers
  • FIG. 11D shows a single turn MLMT structure having 26 layers
  • FIG. 12 is a graph illustrating the value of the quality factor as a function of frequency
  • FIG. 13A is a graph illustrating the relative changes in resistance and inductance with the number of layers
  • FIG. 13B is a graph illustrating the resultant quality factor at 10 MHz for the given number of layers
  • FIG. 14A is a graph illustrating the quality factor as a function of frequency
  • FIG. 14B is a graph illustrating the inductance relative to a 16 layer coil as a function of frequency
  • FIG. 14C is a graph illustrating the resistance relative to the 16 layer coil as a function of frequency
  • FIG. 15A is a graph illustrating the quality factor as a function of frequency
  • FIG. 15B is a graph illustrating the inductance as a function of frequency
  • FIG. 15C is a graph illustrating the resistance as a function of frequency
  • FIG. 16A is a graph illustrating the quality factor as a function of frequency for a coil having a metal strip width of 1 mm;
  • FIG. 16B is a graph illustrating the relative increase in quality factor for a coil having a metal width of 1.5 mm;
  • FIG. 16C is a graph illustrating the relative increase in quality factor for a coil having a metal width of 2 mm;
  • FIG. 17 illustrates a high-level block diagram of a near-field energy network
  • FIGS. 18A illustrates a graph showing a situation where the receiving unit and transmitting unit have identical resonant frequencies the bands narrow;
  • FIG. 18B illustrates a graph showing a situation where the receiving unit and transmitting unit have different resonant frequencies the bands narrow;
  • FIG. 18C illustrates a graph showing a situation where the receiving unit and transmitting unit have different resonant frequencies and the receiving unit has a wide resonant;
  • FIG. 18D illustrates a graph showing a situation where the receiving unit and transmitting unit have different resonant frequencies and the transmitting device is lossy;
  • FIG. 18E illustrates a graph showing a situation where the receiving unit and the transmitting unit have resonant frequencies that are far apart and both the transmitting unit and the receiving unit are lossy;
  • FIG. 18F illustrates a graph showing a situation where the receiving unit and the transmitting unit have resonant frequencies that are close and both the transmitting unit and the receiving unit are lossy;
  • FIG. 19 illustrates a high-level block diagram of a near-field energy network with repeaters
  • FIG. 20 illustrates a typical PCB stackup
  • FIG. 21 is a table of fabrication stack up for a 6-layer PCB board as obtained from an established PCB manufacturer
  • FIG. 22 illustrates an equivalent circuit diagram of any MLMT structure created using a multi-layer wire
  • FIG. 23 illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as an inductor (condition 1);
  • FIG. 24A illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as a self-resonator in a circuit (Type 1);
  • FIG. 24B illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as a standalone self-resonator (Type 1);
  • FIG. 25A illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire showing a capacitor addition in series
  • FIG. 25B illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire showing a capacitor addition in parallel
  • FIG. 26A illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as a resonator in a circuit where resonance is achieved by adding a capacitor in parallel;
  • FIG. 26B illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as a standalone resonator where resonance is achieved by adding a capacitor to the circuit in series;
  • FIG. 26C illustrates an equivalent circuit diagram for an MLMT structure created using a multi-layer wire operating as a standalone resonator where resonance is achieved by adding a capacitor to the circuit in parallel;
  • the various technologies disclosed herein generally relate to methods, systems and apparatus to design, operate and manufacture wireless transmission and/or wireless reception systems, and more specifically, to methods, systems and apparatus to design, operate and manufacture a high efficiency structure for use in near-field wireless transmission and/or reception.
  • Wireless transmission may embody wireless transmission of electrical energy, electromagnetic energy, and electrical power such as the embodiments.
  • wireless transmission may embody the transmission of digital data and information.
  • a combination of electrical energy, electromagnetic energy, electrical power, electronic data and information may be transmitted together or separately such as the embodiments discussed in energy networks. It is further contemplated that such wireless transmission could occur at the same time or over a period of time intervals. Further embodiments of wireless transmission are discussed in the energy networks, power networks, data networks and near-field power and data transfer system sections below.
  • Wireless reception may embody wireless reception of electrical energy, electromagnetic energy, and electrical power such as the embodiments.
  • wireless reception may embody the reception of digital data and information.
  • a combination of electrical energy, electromagnetic energy, electrical power, electronic data and information may be received together or received separately such as the embodiments discussed in energy networks. It is further contemplated that such wireless reception could occur at the same time or over a period of time intervals. Further embodiments of wireless reception are discussed in the energy networks, power networks, data networks and near-field power and data transfer system sections below.
  • Wireless communication may embody wireless transmission and reception of electrical energy, electromagnetic energy, and electrical power such as the embodiments.
  • wireless communication may embody the transmission and reception of digital data and information.
  • a combination of electrical energy, electromagnetic energy, electrical power, electronic data and information may be transmitted and received together or transmitted and received separately such as the embodiments discussed in energy networks. It is further contemplated that such wireless transmission and reception could occur at the same time or over a period of time intervals. Further embodiments of wireless communication are discussed in the energy networks, power networks, data networks and near-field power and data transfer system sections below.
  • Efficiency of a system is defined as the ratio of the output to the input.
  • the output is generally smaller than the input due to innate resistances and impedances.
  • a typical loss occurs as energy is transferred through air.
  • energy is also lost as electrical current flows through a system's circuitry and its related elements such as an inductor, a capacitor, and a resistor, as well as through a system's componentry such as an antenna, a resonator or the like.
  • An illustration of energy loss in a low efficiency system is depicted in FIG. 1 .
  • An antenna is generally a conductor by which electromagnetic waves are sent out or received.
  • An antenna may consist of, but is not limited to, a wire or a set of wires.
  • a resonator is generally any device or material that resonates, including any system that resonates.
  • a resonator may be an instrument for detecting the presence of a particular frequency by means of resonance, and may also be any circuit having this frequency characteristic. Further, a resonator may be an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude.
  • antennas often act as resonators when, for example, they self resonate or when they are coupled with another reactive element such as a capacitor to achieve resonance.
  • the terms antenna and resonator are often used interchangeably herein, and are also referred to generically as a structure (e.g., multi-layer multi-turn structure).
  • Skin effect is generally the tendency for an alternating current to concentrate near the outer part or “skin” of a conductor. As illustrated in FIG. 2 , for a steady unidirectional current through a homogeneous conductor, the current distribution is generally uniform over the cross section; that is, the current density is the same at all points in the cross section.
  • the current With an alternating current, the current is displaced more and more to the surface as the frequency increases. This current does not effectively utilize the full cross section of the conductor. The conductor's effective cross section is therefore reduced so the resistance and energy dissipation are increased compared with the values for a uniformly distributed current. In other words, as illustrated in FIG. 3 , due to the skin effect, the current density is maximum near the surface (also called the "skin") of the conductor and decays exponentially to the center of the cross-section.
  • the present invention describes a wire comprising a plurality of layers.
  • Each conductive layer may comprise but is not limited to a conductive tape, a conductive ribbon, a deposited metal or the like.
  • Each conductive layer may be separated from other conductive layers by some insulation material.
  • the insulation materials may be but are not limited to Styrofoam, silicon dioxide, a suitable biocompatible ceramic or any similar dielectric with a low permittivity, a non-conductive dielectric with a high permittivity, a ferrite material, or any combination thereof or air.
  • This "layered wire” could then have one or more turns to create a multi-turn structure.
  • the "layered wire” herein referred to as a multi-layer wire is used to create a complete structure herein referred to as a multi-layer-multi-turn (MLMT) structure.
  • the MLMT structure may be but is not limited to a antenna, a resonator, a coil, a lumped element or any combinations thereof.
  • the lumped element may be but is not limited to an inductor, a capacitor, a resistor, or any combinations thereof.
  • the multi-layer wire is the fundamental building block of any structure requiring reducible resistance.
  • the multi-layer wire may also be used for achieving reducible resistance in any conductive trace whether it is purely an interconnect between two points in a circuit, a coil used as a lumped element in circuit such as but not limited to an inductor, a capacitor, a resistor or any combinations thereof, a miniature element such as an inductor, a capacitor, a resistor or any combination thereof in a filter, a coil used as but not limited to an antenna or a resonator for wireless communication, or any structure like a PIFA and its derivatives, a rectangular microstrip antenna or Patch antenna and its derivatives, ultra wideband (UWB) structures, monopole structures, a bow-tie structure and the like, or any combination thereof,
  • UWB ultra wideband
  • Skin depth or “penetration depth” ⁇ is frequently used in assessing the results of skin effect. It is generally accepted that the depth below the conductor surface at which the current density has decreased to about 1/ e (approximately 37%) of its value at the surface. The term “skin depth” is therefore described as the depth within the cross-section where the current density has dropped to about 37% of the maximum. This concept applies to plane solids, but can be extended to other shapes provided the radius of curvature of the conductor surface is appreciably greater than ⁇ .
  • the penetration depth in copper is 8.5 mm (0.33 in.); at 10 GHz it is only 6.6 ⁇ 1 0-7 m.
  • the skin depth is a strong function of frequency and decreases with increasing frequency. This phenomenon is displayed in the graph shown in FIG. 4 .
  • the fundamental concept of the multi-layer wire then is to maximize the available current density over the full wire cross-section thereby reducing the wire's intrinsic resistance.
  • Multi-layering leverages a structure's active conduction capability at a frequency or frequencies while minimizing unused conductible material due to skin effect and, hence, eliminating wasted structural space.
  • the multi-layer wire concept is illustrated in FIG. 5 .
  • the current density at all points in the wire is greater than or equal to ⁇ 37% of the maximum possible current density (at surface).
  • a different base current density will be obtained. For example, by using a layer thickness of about 4 times the skin depth, it will be ensured that current density is greater than or equal to ⁇ 14% of the maximum possible current density (at surface). Similarly, for conductor depth approximately 6 times the skin depth, the current density is greater than or equal to 5 %.
  • a conductor skin depth of about 8.5 mm will result in a layer thickness of about 17 mm. Given these dimensions then, most applications would typically use wires with cross-sectional dimensions less than that of one layer thickness. At higher frequencies however like 5 GHz, a conductor skin depth of about 1 ⁇ m will result in a layer thickness of about 2 ⁇ m. At higher frequencies the practical fabrication including its associated costs may be prohibitive.
  • the multi-layer wire of the present invention is manufacturable using standard production processes like but not limited to PCB technology, thus the multi-layer wire of the present invention provides a practical ability to achieve highly efficient wireless communication based on the ability to significantly reduce the internal resistance of a structure.
  • an ideal proposed configuration for a multilayer wire includes conductive layers with thickness/depth about twice the skin depth, and an insulating layer, as thin as technologically possible
  • Wave-guide and resonant cavity internal surfaces for use at microwave frequencies are therefore frequently plated with a high-conductivity material, such as silver, to reduce the energy losses since nearly all the current is concentrated at the surface.
  • a high-conductivity material such as silver
  • the conductor is as good as a solid conductor of the coating material.
  • Quality factor is generally accepted as an index (figure of measure) that measures the efficiency of an apparatus like an antenna, a circuit, or a resonator.
  • Via is defined herein as an electrically conductive connection from one layer to another.
  • a Litz wire is generally a wire constructed of individual film insulated wires bunched or braided together in a uniform pattern of twists and length of lay.
  • FIG. 6 illustrates a high-level diagram of a wire structure for a component for wireless communication.
  • the wire structure includes a coil 100 of a multi-layer wire 101.
  • the shape of the coil 100 may be circular, rectangular, triangular, some other polygon, or conformal to fit within a constrained volume.
  • FIG. 6 illustrates one exemplary configuration of a coil in the form of a circular shaped coil 100.
  • the configuration of the coil 100 may be solenoidal, spiral, or spiral-solenoid.
  • a solenoid coil follows a helical curve that may have multiple turns where each turn has the same radius.
  • a spiral coil configuration may have a number of turns with a progressively increasing or decreasing radius.
  • a spiral-solenoidal coil configuration is a combination of a spiral and solenoidal configuration. Other configurations known to those of ordinary skill may also be utilized to form the coil.
  • FIGS. 7A-7H illustrate examples of different wire configurations that may be utilized.
  • FIG. 7A illustrates an example of a wire in a circular solenoidal configuration 102.
  • FIG. 7B illustrates an example of a wire in a square solenoidal configuration 103.
  • FIG. 7C illustrates an example of a wire in a circular spiral configuration 104.
  • FIG. 7D illustrates an example of a wire in a square spiral configuration 105. It is understood that other spiral configurations, such as rectangular or triangular shape may also be utilized.
  • FIG. 7E illustrates an example of a wire in a multi-layer square spiral configuration 106. It should be noted that although only two layers are illustrated in FIG. 7E , it is understood that any number of layers may be used.
  • the multiple wire layers may be connected using but not limited to vias. solder, tabs, wires, pins, or rivets.
  • These connectors serve at least the following two purposes: (1) the connectors connect the layers of wire for the multi-layer wire; and (2) the connectors connect one turn of the multi-layer wire to a second turn of the multi-layer wire. For example, for a two-turn wire structure then, there would be at least one via from the first turn to the second turn. Other purposes may also be served by the connectors.
  • Vias can be of the form commonly used in printed circuit board (PCB) technologies (for example, through-hole, buried, blind) or those utilized in semiconductor or MEMS technology.
  • the via can be, but is not limited to, any conductive material that is laser-welded, welded, printed, soldered, brazed, sputtered deposited, wire-bonded and the like in order to electrically connect at least any two layers and/or all layers.
  • FIG. 7F illustrates an example of a wire in a circular spiral-solenoidal configuration 107.
  • FIG. 7G illustrates an example of a wire in a square spiral-solenoidal configuration 108.
  • FIG. 7H illustrates an example of a wire in a conformal solenoid configuration 109.
  • the wire in a conformal configuration may take the form of but is not limited to a circular or rectangular solenoid or a circular or rectangular spiral. Any of the wire configurations shown in FIGS. 7A-7H may be used with the present system.
  • the coil 100 of FIG. 6 may have a plurality of turns 110.
  • a turn may be but is not limited to a bend, fold or an arc in the wire until the wire completes a revolution around the central axis point of the coil 111.
  • a turn may be in the same or similar shape of the coil configuration, such as, for example, but not limited to a circle, a rectangle, a triangle, some other polygonal shape, or conformal to fit within a constrained volume.
  • FIG. 8A illustrates a single turn circular wire coil having N layers, where "N" is a number equal to or greater than one.
  • FIG. 8B illustrates a double turn circular solenoidal wire coil of N layers.
  • the inductance increases as T x
  • the resistance increases as T y
  • T is the number of turns.
  • x and y are 2 and 1 respectively.
  • Fig 15 three performance examples are given. The graph compares a 32 Layer-2 Turn antenna with a32 Layer-1 Turn antenna and a 64 Layer-1 Turn antenna all created using a multi-layered wire of the present invention.
  • the inductance and resistance for the 32 Layer-2 Turn antenna increase between 3-3.5 times and 1.7-3 times, respectively; over the 32 Layer - 1 Turn antenna in the frequency range 1 MHz-200 MHz. This increase is very near expected values from simplistic analytical relations wherein resistance is approximately T; and inductance is approximately T 2 .
  • the multi-layer wire 101 in FIG. 6 may have but is not limited to a circular, rectangular, square, or triangular cross-sectional shape. In addition, other shapes known to those of ordinary skill may also be utilized.
  • FIGS. 9A - 9E illustrate examples of cross-sections of wires that may be used in the design of a MLMT structure.
  • FIG. 9A illustrates an example of a multi-layer wire having a circular cross-section 401.
  • FIG. 9B illustrates an example of a multi-layer wire having a rectangular cross-section 402.
  • FIG. 9C illustrates an example of a multi-layer wire having a square cross-section 403.
  • FIG. 9D illustrates an example of a multi-layer wire having a triangular cross-section 404.
  • FIG. 9A - 9E illustrate examples of cross-sections of wires that may be used in the design of a MLMT structure.
  • FIG. 9A illustrates an example of a multi-layer wire having a circular cross-section
  • FIG. 9E illustrates an example of a multi-layer wire having an elliptical cross-section 405.
  • FIG. 9F illustrates a rectangular cross-section of a multi-layer wire having a first conductive layer 410 and a second conductive layer 420.
  • An insulating material 430 separates the first layer 410 from the second layer 420.
  • the first layer 410 and second layer 420 are connected with vias 440 which traverse the insulating material 430.
  • the conductive layers 410, 420 may be layers of conductive tape/ribbon/sheet/leaf or deposited metal having a metal thickness and metal strip width.
  • the metal thickness of the first layer 410 is identified by line A-A and the metal strip width of the first layer 410 is identified by line B-B.
  • the metal thickness of a wire layer may be approximately twice the skin depth.
  • the skin depth may range from approximately one-half of the conductor depth to about equal to the conductor depth
  • Each layer in a turn will have substantially the same
  • the thickness of the insulating material may be sufficient to meet the needs of the application or equal to the minimum thickness possible by the available fabrication technology. Additionally, the overall structure feasibility depends on the frequency of operation (as shown in the graph of FIG. 4 ), associated costs and fabrication technology utilized. Generally in PCB technology, the thickness of layers is dictated by the "core thickness" and the pre-preg thickness. In other designs, the thickness of the non-conducting layer is selected to modify the electrical behavior of a structure.
  • Typical PCB stackup comprises alternating layers of the core and the pre-preg.
  • the core generally comprises a thin piece of dielectric with copper foil bonded on both sides.
  • the core dielectric is generally cured fiberglass-epoxy resin.
  • the pre-preg is generally uncured fiberglass-epoxy resin.
  • the pre-preg will cure ( i.e., harden) when heated and pressed.
  • the outermost layers are generally pre-preg with copper foil bonded to the outside (surface foils).
  • Stackup is generally symmetric about the center of the board in the vertical axis to avoid mechanical stress in the board under thermal cycling as shown in FIG. 20 .
  • the conductor and insulating layer thicknesses are equal to the minimum thickness possible by the available fabrication technology is given for an application at 13.56 MHz.
  • the skin depth is about 17.8 micrometers.
  • the conductor depth should be about 35.6 micrometers and the insulation thickness should be as small as possible.
  • the fabrication stack up obtained for a 6-layer PCB board is about 71 micrometers which is nearly 4 times the skin depth.
  • the insulating layer is more than 3 times the conductive layer. Advanced PCB techniques, which come at a significantly higher cost, may allow a lower conductor and insulation depth.
  • PCB techniques currently in the research stage could allow the conductive material like copper as low as 5 micrometers and the insulating dielectric about 39 micrometers.
  • Other techniques such as semiconductor fabrication and MEMS fabrication techniques could allow much thinner layer thickness leading to performance that is nearer to ideal. If semiconductor or MEMS fabrication is used, the thicknesses of both the conducting layers and the insulating layers may be as thin as a few 100 nanometers or even thinner. In a preferred embodiment, the dielectric layer thickness is less than 200 micrometers and as perfectly insulating as possible, and with a permittivity lower than 10.
  • the dielectric layer could be made from several materials, and can be of various configurations. For example, some applications may require extremely low parasitic capacitance. In such cases, a non-conducting dielectric with the lowest possible permittivity is preferred. Additionally, it may be desired to increase the insulating layer thickness to minimize the parasitic effects. Another example would be for applications that might require ferrite materials to increase inductance and/or increase magnetic shielding. In such cases, the dielectric layers might be replaced by a ferrite film/block or similar propertied configuration/material.
  • the insulating material will be of a thickness such that the thickness is within the practical capabilities of the manufacturing technology used to manufacture that resonator and compatible with the efficiency needs of the application for which the resonator is intended.
  • the material of the conductive layers may be copper or gold, however, other materials are possible. To enhance conductivity, copper or gold with a layer of deposited silver may also be used.
  • the typically known biocompatible materials should be utilized, including additions for enhancing conductivity. These may include, but are not limited to, conductive material taken from the group of: titanium, platinum and platinum/iridium alloys, tantalum, niobium, zirconium, hafnium, nitinol, Co-Cr-Ni alloys such as MP35N, Havar®, Elgiloy®, stainless steel, gold and its various alloys, palladium, carbon, or any other noble metal.
  • the insulating material may be (i) air, (ii) a dielectric with a low permittivity (such as, for example, Styrofoam, silicon dioxide, or any suitable biocompatible ceramic), (iii) a non-conductive dielectric with a high permittivity, (iv) a ferrite material, or (v) a combination of the materials listed above.
  • a dielectric with a low permittivity such as, for example, Styrofoam, silicon dioxide, or any suitable biocompatible ceramic
  • a non-conductive dielectric with a high permittivity such as, for example, Styrofoam, silicon dioxide, or any suitable biocompatible ceramic
  • a non-conductive dielectric with a high permittivity such as, for example, Styrofoam, silicon dioxide, or any suitable biocompatible ceramic
  • a non-conductive dielectric with a high permittivity such as, for example, Styrofoam, silicon dioxide, or any suitable biocompatible ceramic
  • a high capacitive effect is required to affect a lower self-resonance frequency of an antenna
  • a high permittivity dielectric might be preferred, or, a combination of materials including a ferrite film or ferrite block might be preferred to increase the self-inductance of the antenna.
  • the use of a ferrite core may be used to provide increased performance.
  • FIG. 10A - FIG. 10B illustrate examples of different multi-layer wire cross-sectional configurations.
  • FIG. 10A illustrates a multi-layer wire having a circular cross-section 510.
  • FIG. 10B illustrates a multi-layer wire having a rectangular cross-section 520.
  • the via 530 that connects the conductive layers 540 is positioned at the port or input 550, which is the beginning of the wire.
  • the positioning of the vias 530 that connect the conductive layers may impact the performance of the MLMT structure. For example, insufficient vias may lead to phase differences between the different layers. Conversely, an abundance of vias may lead to additional cyclical current paths that may increase the resistive loss.
  • the vias may be located at the beginning of the wire (e.g., port, input, etc), or at one or more locations along the wire. Additionally, the vias between one set of two or more conductive layers may be at a different location than another set of two or more conductive layers. It is understood that several variations may be possible depending on the application and the system design.
  • the via can be made using techniques standard to the technology being utilized for the fabrication of the MLMT structure. In other cases, the vias can be implemented using soldering techniques, such as, by connecting the several layers at via locations using electric solder, welded tabs, laser weld tacking, or other commonly known electrical connecting techniques.
  • the MLMT structure is preferably designed with a multi-layer wire of high quality factor (QF) to achieve efficient transfer of power that reduces intrinsic resistive losses of the MLMT structure at high frequencies.
  • the quality factor is the ratio of energy stored by a device to the energy lost by the device as given in FIG. 1 .
  • the QF of an MLMT structure is the rate of energy loss relative to the stored energy of the MLMT structure.
  • a source device carrying a time-varying current, such as an antenna possesses energy which may be divided into three components: 1) resistive energy (W res ), 2) radiative energy (W rad ), and 3) reactive energy (W rea ).
  • W res resistive energy
  • W rad radiative energy
  • W rea reactive energy
  • near-field communications radiative and resistive energies are released by the device, in this case the antenna, to the surrounding environment.
  • energy must be transferred between devices having limited power stores, e.g., battery powered devices having size constraints, excessive power loss may significantly reduce the devices' performance effectiveness.
  • near-field communication devices are designed to minimize both resistive and radiative energies while maximizing reactive energy. In other words, near-field communications benefit from maximizing Q.
  • the efficiency of energy and/or data transfer between devices in an inductively coupled system is based on the quality factor of the antenna in the transmitter (Q1), the quality factor of the antenna in the receiver (Q2), and the coupling coefficient between the two antennas (K).
  • the efficiency of the energy transfer varies according to the following relationship: eff ⁇ K 2 •Q 1 Q 2 .
  • a higher quality factor indicates a lower rate of energy loss relative to the stored energy of the antenna.
  • a lower quality factor indicates a higher rate of energy loss relative to the stored energy of the antenna.
  • the coupling coefficient (K) expresses the degree of coupling that exists between two antennas.
  • a higher quality factor may be achieved using multiple layers in a multi-layer wire for a single turn of coil. Increasing the number of turns in a coil may also be used to increase the quality factor of the structure. For a design at a constant frequency, there may be an optimum number of layers to reach a maximum quality factor. Once this maxima is reached, the quality factor may decrease as more layers are added.
  • the design variables that may be used for the multi-layer wire include:
  • the MLMT structure created using a multi-layer wire may be a single turn circular coil, as illustrated in FIGS. 11A - 11D .
  • the single turn coil includes a single turn and may include a metal strip width of approximately 1.75 mm, a metal thickness of approximately 0.03 mm, an insulating layer of approximately 0.015 mm, and an outer radius of approximately 5 mm.
  • the wire may have between 5 and 60 layers, such as 5, 11, 20, 26, 41, or 60 layers.
  • FIG. 11A shows a single turn MLMT structure having 1 layer
  • FIG. 11B shows a single turn MLMT structure having 11 layers
  • FIG. 11C shows a single turn MLMT structure having 20 layers
  • FIG. 11D shows a single turn MLMT structure having 26 layers.
  • the wire may have less than 5 or more than 60 layers in order to achieve a high quality factor.
  • the corresponding coil thickness for the range of 5 to 60 layers may be between approximately 0.2 mm to 3 mm, such as for example, 0.2, 0.5, 1, 1.25, 2.05, or 3 mm, respectively.
  • the quality factor at 10 MHz is approximately 80.
  • the quality factor is increased to approximately 210.
  • an increase in the number of layers per turn results in an increase in quality factor until maxima is reached, after which the quality factor starts to decrease. This decrease may occur when the total height of the MLMT structure becomes comparable to its radius.
  • the degradation starts due to greatly increased parasitic effects due to the multiple layers (e.g. capacitance and proximity effects).
  • increasing the layers to 20, 26, 41 and 60 results in quality factors of approximately 212, 220, 218 and 188, respectively.
  • FIG. 12 provides a graph of the value of the quality factor as a function of frequency.
  • FIG. 13A is a graph illustrating the relative changes in resistance and inductance with the number of layers.
  • FIG. 13B illustrates the resultant quality factor at 10 Mhz. It should be noted that with regard to FIGS. 13A-B , the data points on the graph correspond as data point 1 is for 1 layer, data point 2 is for 11 layers, data point 3 is for 20 layers, data point 4 is for 26 layers, data point 5 is for 41 layers, and data point 6 is for 60 layers. To ensure signal flow through all layers of the structure, it is preferable that at least two vias be included for any multi-layer wire and/or structure.
  • These two vias are preferably located at the ports of the wire/structure.
  • optimal performance for 10 MHz is achieved for an antenna configuration having 26 layers and 1 turn.
  • the peak quality factor is obtained around 35 MHz and is approximately 1100.
  • the antenna may be a single turn circular coil of multi-layer wire and may have a metal strip width of approximately 1 mm, a metal thickness of approximately 0.01 mm, an insulating layer of approximately 0.005 mm, and an outer radius of approximately 5 mm.
  • the wire may have between 16 and 128 layers, such as 16, 32, 64, or 128 layers. However it is understood that the wire may have less than 16 or more than 128 layers in order to achieve a high quality factor.
  • the corresponding coil thickness for the range of 16 to 128 layers may be between approximately 0.25 mm to 2 mm, such as for example, 0.25, .5, 1, or 2 mm, respectively.
  • the quality factor improves with increasing the number of layers, with larger quality factors achieved at higher frequencies.
  • the quality factor for 16, 32, 64 and 128 layers is approximately 127, 135, 140 and 185, respectively.
  • the peak quality factor increases to nearly 2900 at approximately 450 MHz under these design parameters.
  • the relative resistance may be lowest around the frequency at which the conductor thickness is about twice the skin depth. In this example, that frequency is 160 MHz.
  • FIGS. 14A-C are graphs illustrating the performance parameters and trends.
  • FIG. 14A is a graph illustrating the quality factor as a function of frequency.
  • FIG. 14B is a graph illustrating the inductance relative to a 16 layer coil as a function of frequency.
  • FIG. 14C is a graph illustrating the resistance relative to the 16 layer coil as a function of frequency.
  • the quality factor improves with an increasing number of layers with relatively larger quality factors at higher frequencies.
  • FIGS 14B-C where it is shown that where the inductance is relatively constant (as compared to a 16 layer 1 turn coil) with frequency, while the resistance decreases as frequency increases as shown by the troughs around 100 MHz in FIG. 14C .
  • the peak quality factor goes up to approximately 2900 at around 450 MHz.
  • FIGS. 15A-C are graphs illustrating the performance parameters and trends for this 32 layer, double turn antenna compared to the 32 and 64 layer, single turn antennas in the preceding example.
  • FIG. 15A is a graph illustrating the quality factor as a function of frequency.
  • FIG. 15B is a graph illustrating the inductance as a function of frequency.
  • 15C is a graph illustrating the resistance as a function of frequency.
  • the inductance is nearly constant and the resistance follows trends similar to the single turn antennas.
  • both the inductance and resistance rise rapidly due to the contribution of parasitic capacitance, which is explained below.
  • an antenna may display parasitic effects. Associated with the antenna is a parasitic capacitance that is frequency dependent and whose contribution to the overall impedance increases with frequency. As a result of the parasitic capacitance, there exists a self-resonance frequency for the antenna beyond which the antenna behaves like a capacitor. To prevent the onset of parasitic capacitance, the antenna may be designed such that the inductance is nearly unchanging around the frequency of operation. Preferably, the slope of the reactance versus frequency graph is nearly linear (around the frequency of operation) with slope,
  • the coil may include a metal strip width of approximately 1 mm, a metal thickness of approximately 0.01 mm, an insulating layer of approximately 0.01 mm, and an outer radius of approximately 10 mm.
  • Increasing the width of the metal reduces the resistance and the inductance, resulting in a higher quality factor. Due to the overall large size of the antenna (outer radius ⁇ 10 mm), the relatively small increase in the width (w) does not reduce the inductance.
  • FIGS. 16A-C are graphs illustrating the quality factors as a function of frequency for this example with a metal strip width of approximately 1mm, 1.5mm and 2mm, respectively.
  • the quality factor at 379 MHz is approximately 1425 for a metal strip width of 1mm.
  • Increasing the metal strip width to 1.5 mm and 2 mm increases the quality factor to approximately 1560 and 1486, respectively.
  • utilization of near-field communication for wireless transmission and/or reception can be applied to energy, power or data networks.
  • FIG. 17 illustrates a high-level block diagram of a near-field energy network 10.
  • the network 10 includes a plurality of devices 11 a-d (generally referred to as device 11).
  • Each device 11 may include a transceiver.
  • the transceiver may include a transmitting unit 12 a-d and a receiving unit 14 a-d for wireless communications.
  • each transceiver may include a transmitting unit 12 and a receiving unit 14, it is understood that the transceiver may comprise only a transmitting unit 12 or only a receiving unit 14.
  • the transmitting unit 12 and the receiving unit 14 in the transceiver may share certain or all circuit elements or may have separate and distinct circuit elements.
  • the transmitting unit 12 and/or receiving unit 14 may be coupled to a load 16.
  • the load 16 may comprise of components within the device 11, outside the device 11, or a combination of components within and outside the device 11.
  • Each transmitting unit 12 includes a transmitting antenna 13.
  • the transmitting antenna 13 has a resonant frequency ⁇ and preferably has minimal resistive and radiative losses.
  • the load 16 may include driver circuitry to generate signals to drive the transmitting antenna 13. Based on the received signals, the transmitting antenna 13 may produce a near-field in all directions (omni-directional) or may produce a near-field targeted towards a specific direction (directional).
  • the targeted near-field may be produced through shielding, such as by ferrite materials. Of course, it is understood to those skilled in the art that other materials may be used to provide targeted near-fields.
  • Each receiving unit 14 includes a receiving antenna 15.
  • a single antenna may be used for both the receiving antenna 15 and the transmitting antenna 13 or a separate antenna may be used for the receiving antenna 15 and the transmitting antenna 13.
  • Each antenna 13, 15 has a resonant frequency (referred to as ⁇ a - ⁇ d ). If separate transmitting and receiving antenna are used, it is preferred that the resonant frequency of the receiving antenna 15 is equal to the resonant frequency of the transmitting antenna 13.
  • a receiving unit 14 of one device 11 e.g., receiving unit 14 b of device 11 b
  • the transmitting unit 12 of another device 11 e.g., transmitting unit 12 a of device 11 a
  • an electromagnetic field generated by the transmitting unit 12 a will interact with the receiving unit 14 b .
  • the reactive electromagnetic fields of the transmitting unit 11 a will induce an alternating current within the receiving unit 14 b .
  • the induced current may be used to provide power or convey data to load 16 b .
  • device 11 b is able to absorb energy from device 11 a .
  • any number of devices having a resonant frequency equal to the resonating frequency of the transmitting device may be added to the near-field energy network and draw energy from the transmitting device, provided that the resonant frequency of the transmitting unit 12 a is not significantly altered due to the loading effect of the added devices.
  • the receiving unit 14 e.g., receiving unit 14 c of device 11 c having resonant frequency ⁇ c
  • the transmitting unit 12 e.g., transmitting unit 12 a of device 11 a having resonant frequency ( ⁇ a )
  • the receiving unit 14 c will have a high impedance to the transmitting unit 12 a and will draw little energy from the transmitting unit 12 a .
  • FIGS. 18A-F illustrates graphs showing how various factors affect the transfer of energy.
  • FIG. 18A illustrates a situation where ( ⁇ a and ⁇ c are identical and the bands narrow. This represents an ideal scenario and the case of maximum power transfer efficiency.
  • FIG. 18B illustrates a situation where ⁇ a and ⁇ c are different and the bands narrow. No energy is transferred in this scenario.
  • FIG. 18C illustrates a situation where ⁇ a and ⁇ c are different and receiving unit 14 c has a wide resonant. A wider resonant band occurs when an antenna has higher resistive and radiative losses.
  • Receiving unit 14 c has more impedance to ⁇ a than in the situation shown in FIG. 18B , but is still able to absorb some energy from transmitting device 11 a .
  • FIG. 18A illustrates a situation where ( ⁇ a and ⁇ c are identical and the bands narrow. This represents an ideal scenario and the case of maximum power transfer efficiency.
  • FIG. 18B illustrates a situation where ⁇ a and ⁇ c are different and the bands narrow. No energy
  • FIG. 18D illustrates a situation where ⁇ a and ⁇ c are different and transmitting device 11 a is lossy. Resistive and radiative losses in transmitting device 11 a lead to a wide resonant band. A smaller portion of the antennas energy is available for transfer to receiving unit 14 c .
  • FIG. 18E illustrates a situation where ⁇ a and ⁇ c are far apart and both the transmitting unit 12 a and the receiving unit 14 c are lossy. Here, no energy is transferred from the transmitting unit 12 a to the receiving unit 14 c .
  • FIG. 18F illustrates a situation where ⁇ a and ⁇ c are close and both the transmitting unit 12 a and the receiving unit 14 c are lossy. Energy is transferred between the transmitting unit 12 a and the receiving unit 14 c but the system is inefficient due to high losses.
  • a power transfer network may be developed according to the present teachings.
  • a receiving unit 14 b When a receiving unit 14 b is placed within the near-field of a transmitting unit 12 a and the resonant frequency of the receiving unit 14 b (i.e., ( ⁇ b ) is approximately equal to the resonant frequency of the transmitting unit 12 a ( ⁇ a ), energy will transfer from the transmitting unit 12 a to the receiving unit 14 b .
  • each receiving device e.g., 11 b -11 d
  • the receiving devices 11 a -11 d may include a transducer which may use the induced alternating current to store energy in a power storage device, such as battery or capacitor. Alternatively, the transducer may use induced alternating current to directly power electronic components within or couple to the receiving device (e.g., 1 1 b -11 d ).
  • one or more repeaters 18 may be used in order to deliver energy to receiving devices 11 outside of the near-field (e.g., receiving unit 11 e ).
  • the one or more repeaters 18 may contain an antenna 20 which is tuned to ⁇ a .
  • the repeater 18 may draw energy from the transmitting unit 12 via the antenna 20 in the form of an induced current.
  • the one or more repeaters 18 may use the induced current to produce a second energy field using the antenna 20.
  • the second energy field may be produced using a second antenna (not shown).
  • the second energy field may be used to induce an alternating current in the receiving unit 14 e .
  • the receiving unit 14 e may include a transducer which may use the induced alternating current to store energy in a power storage device, such as battery or capacitor. Alternatively, the transducer may use induced alternating current to power electronic components within the receiving unit 14 e .
  • the antenna 20 or second antenna may produce a near-field in all directions (omni-directional) or may produce a near-field targeted towards a specific direction (directional).
  • a data transfer network may be developed according to the present teachings.
  • a network designed for data transfer would be similar to the power networks described previously, except that the signal transmitted by the transmitting devices in the network may be modulated time-varying signals which carry data.
  • One example of a data network layout includes one or more receiving units (14 b-d ) placed within the near-field of a transmitting unit 12 a .
  • Each of the receiving units (14 b-d ) may be capable of communicating to the transmitting unit 12 a and/or other receiving units 14. It is understood that receiving units which may be out of near-field of the transmitting unit 12 may be reached using one or more repeaters 18 in the manner described above.
  • a receiving unit 14 may be placed far-field of the transmitting unit 12 and utilize the radiative field of the transmitting unit 12 for communication. Such far-field communication is achieved in a manner similar to far-field communication techniques known to those of ordinary skill in the art.
  • the devices 11 within the networks may be designed to handle data-transfer in several ways.
  • the devices 11 and their antennas 13, 15 may be designed to (1) receive data only; (2) transmit data only; or (3) receive and transmit data, using either a shared antenna for receiving and transmitting or separate and dedicated antennas for receiving and transmitting.
  • the devices 11 may be designed to handle both data- and power-transfer.
  • each device 11 may be designed to: (1) transfer data only; (2) transfer power only; (3) transfer data and power, where each device 11 may use any combination of sending / receiving data and sending / receiving power, each device 11 has a shared antenna for data- and power-transfer, or each device 11 has separate, dedicated antennas for data- and power-transfer.
  • Each receiving unit 14 may have an electronic identification (ID) that is unique to that receiving unit 14 on the network 10.
  • ID acts as an identifier for a particular receiving unit 14 on the network and allows a receiving unit 14 on the network to identify other receiving units 14 on the network 10 for communication.
  • a transmitting device would identify a receiving device with its ID and begin communications using an initiation instruction. The data transfer would occur using a specified modulation scheme. Security protocols may be used to ensure that the data transferred by and stored in the devices are secure and not accessible to unauthorized devices which are not present in the designed network 10.
  • Periodic data communication may occur between a transmitting unit 12 and one or more receiving units 14 or between a receiving unit 14 and one or more other receiving units 14.
  • a transmitting unit 12 may identify a particular receiving unit 14 based on its ID and initiate a communication session.
  • a receiving unit 14 may identify a transmitting unit 12 based on its ID and initiate a communication session. The communication session may be terminated by either the transmitting unit 12 or the receiving unit 14.
  • two receiving units 14 may connect directly with each other in direct communication.
  • two receiving units 14 may connect with each other using the transmitting unit 12 as an intermediary.
  • each receiving unit 14 may connect to the transmitting unit 12 and the transmitting unit 12 would receive information from one receiving unit 14 and transmit it to the other receiving unit 14.
  • two receiving units 14 may communicate using one or more repeaters 18 where the one or more repeaters 18 may receive a signal from a receiving unit 14 and transmit it to another receiving unit 14.
  • the one or more repeaters 18 may be one or more stand-alone resonant antennae and may be independent of any circuitry.
  • the system and method illustrated in FIG. 17 and FIG. 19 to efficiently transfer energy between two or more devices may be used in a variety of applications in order to operate household appliances such as vacuums, irons, televisions, computer peripheral devices; mobile devices; military applications such as surveillance equipment, night vision devices, sensor nodes and devices; transportation applications such as sensors designed to monitor automobile or train performance and safety; aerospace applications, such as control of flaps, rudders, or landing gear; space technology; naval applications such as applications to power unmanned watercraft; traffic control applications such as road imbedded sensors; industrial applications; robotic networks; and medical devices.
  • household appliances such as vacuums, irons, televisions, computer peripheral devices; mobile devices; military applications such as surveillance equipment, night vision devices, sensor nodes and devices; transportation applications such as sensors designed to monitor automobile or train performance and safety; aerospace applications, such as control of flaps, rudders, or landing gear; space technology; naval applications such as applications to power unmanned watercraft; traffic control applications such as road imbedded sensors; industrial applications; robotic networks; and medical devices.
  • near-field power and data transfer are derived from the same physical principles. When utilized together, near-field power and data transfer provide an opportunity to create a wide variety of systems. The following describes a general system for near-field power and data transfer.
  • An near field power and data network may consist of multiple transmitting and receiving units.
  • NF-PDAT near field power and data network
  • a simpler network consisting of a single transmitting unit 12 and a single receiving unit 14 is considered. The following description follows the path of the energy as it is transferred from the transmitting unit 12 to the receiving unit 14 and to a load coupled to the receiving unit 14.
  • the primary source may be a main 50/60Hz wall socket, a standard battery, a rechargeable battery connectable to a wall socket, or a rechargeable battery with indirect recharging.
  • a wall-socket is one preferred method of obtaining energy because of its abundance in this form.
  • batteries may be used.
  • rechargeable batteries may be used. Rechargeable batteries may be replenished when their stored energy falls below a capacity. It is known that recharging allows batteries to be sued in devices that would otherwise drain batteries too quickly, have too little space for batteries of an appropriate size, or have limited access for replacing the battery.
  • a primary source of power such as a wall socket or another battery may be used to replenish battery life in the rechargeable battery.
  • recharging is typically accomplished by connecting the battery to a wall socket for a short period of time (e.g., laptops and cell-phones).
  • a wall socket for a short period of time (e.g., laptops and cell-phones).
  • direct attachment to a power cord is not possible.
  • indirect recharging methods such as inductive coupling to an external power source, have been used. It is understood that recharging may be accomplished by other methods. For example, if there exists a clear line-of-sight between the energy source and the device, an optical link, laser, or highly-directive radio-frequency beam may be used to transfer energy.
  • Alternative sources of energy may be used to power the system or to provide energy for components within the system (such as recharging a battery). These may include the conversion of one form of energy into electrical energy.
  • One such example is the conversion of kinetic energy into electrical energy. This may be accomplished by converting movement into energy.
  • a device attached to the body may use body movements to spin a rotor that causes a generator to produce an alternating current.
  • Another example is the conversion of light energy into electrical energy.
  • photovoltaic cells placed externally may convert sunlight or ambient room light into energy.
  • changes in pressure may be converted into electrical energy.
  • a piezoelectric appropriately placed on a device may be used to convert pressure changes (e.g. air pressure changes or direct pressure through contact) into electrical currents.
  • thermal gradients may be converted into electrical energy.
  • a thermo-electric generator placed within a device may be used to convert a temperature gradient across the device into electrical energy.
  • TEG thermo-electric generator
  • Such a TEG may be useful in devices that produce heat during their operation, as a portion of the heat energy could be converted into electrical energy.
  • the present teachings also include a method for designing a multi-layer wire for use in a high efficiency wireless power and data telemetry system. Given a certain frequency of operation, one or more of the following steps may be followed to design application-specific multi-layer wires and/or MLMT structures:
  • the present teachings also include a method of manufacturing the multi-layer wire after the multi-layer wire is designed.
  • the multi-layer wire utilizes strips of metal that may be deposited through a specific mask in, for example but not limited to, a PCB/ceramic/metal printing process or in a semiconductor foundry.
  • An alternative method of fabricating the multi-layer wire may utilize conductive tape/ribbon/sheet/leaf with one or more tape/ribbon/sheet/leaf placed on top of each other separated by an insulating layer and shorting the multiple strips by soldering at the designated via locations.
  • Another method of fabricating the multi-layer wire would be to cut out specific shapes from conductive sheets or "leaf" (for e.g.
  • a three dimensional printing process (such as that offered by Eoplex Technologies) may also be used in addition to metal deposition processes like physical vapor deposition, thin film deposition, thick film deposition and the like.
  • the present teachings lends itself to be incorporated with current fabrication techniques for multi-layer printed wiring board, printed circuit boards and semiconductor fabrication technologies with multi-layer interconnects. As advancements in fabrication techniques are made, it is expected that the multi-layer wire will likely benefit greatly from such improvements. This compatibility with conventional fabrication techniques will allow these multi-layer wires to be relatively easily incorporated into conventional circuit boards. Such advances may also provide accurate repeatability and small feature sizes (i.e., high resolution).
  • the design and structure of the present system allows for extended range (i.e., the separation distance between a transmitting and a receiving wireless structure).
  • the increase in range enables power to be transferred across a greater distance, allowing the transmitter to be further away from the receiver.
  • the tag read range for high frequency interrogators is no greater than 3 feet, which is insufficient for certain applications, such as pallet tracking.
  • the wireless structure created with the multi-layer wire of the present system offers an improvement for pallet tracking via RFID by delivering the concentrated power that this particular application requires to facilitate reflecting the interrogator signal needed for better extended read range performance.
  • the extended range provided by the present invention enables transfer of power to devices in difficult to reach locations, or to devices in harsh environments. In consumer electronics the extended range allows for the user to charge or transfer energy to a device from a more convenient location.
  • the present system also enables multiple operational needs from a single design concept, namely, the multi-layer wire used to create MLMT structures.
  • the present system may serve as a receiver antenna, a source antenna, a transceiver (acting as a source and a receiver), and as a repeater antenna.
  • the design may be used for inductor designs solely as a lumped element in a circuit (e.g., in RF filters circuits, RF matching circuits).
  • the multi-layer wire structure of the present invention may be represented in various circuit design embodiments.
  • An equivalent circuit diagram for the MLMT antenna structure created using a multi-layer wire is given in FIG. 22 . It comprises the following parameters:
  • the characteristics of the MLMT antenna embodiment created using a multi-layer wire depend on the design values of L M , R M , and C M ; the operating center frequency and additional components that are placed across Terminal 1 and Terminal 2.
  • the MLMT antenna structure created using a multi-layer wire of the present invention then can be represented in various circuit design embodiments.
  • the MLMT antenna structure created using a multi-layer wire can be operated in three modes:
  • the unique arrangement of the layers and customized wire segmentation in the present system compared with existing design technologies demonstrates improved system performance in similar and smaller packaging volumes as shown by quality factors that are more than 2 times higher than those realized from existing technologies.
  • the present system permits pairing of the inductance and quality factor with a specific application to optimally achieve a desired response, including, but not limited to, wireless tissue stimulation, wireless telemetry, wireless component recharging, wireless non-destructive testing, wireless sensing, and wireless energy or power management.
  • Another specific advantage of the present system is that it enables a more efficient means of Near Field Magnetic Coupling (NFMC) for power and/or data transfer in an equivalent or smaller design volume by reducing conductor loss associated with increasing frequencies (due to the phenomenon referred to as Skin Effect).
  • NFMC Near Field Magnetic Coupling
  • the proposed system also provides a solution that can be relatively easily achieved by existing manufacturing techniques (for example multi-layer printed wiring board), and can therefore be integrated with other circuit components such as ICs, resistors, capacitors, surface mount components, etc.
  • Other advantages of the present system includes reducing power consumption thereby leading to longer battery lives (where applicable), a reduction in the Joule heating of the antenna, decreasing the consumption of environmental resources of the appliance/device, and any other benefit derived from a more energy efficient device.
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