RFID device, systems, and methods of manufacturing thereof with enhanced environmental performance

Abstract

The present subject matter disclosed herein relates to a radio frequency identification (RFID) device and manufacturing system are disclosed. The RFID device includes an antenna configured to operate at a predetermined frequency, a ground plane, and a dielectric spacer positioned between the antenna and the ground plane. The dielectric spacer has a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials. An electrical connection between the antenna and the ground plane is formed, with the ground plane shielding the antenna from electromagnetically reflective surfaces. The manufacturing system includes supply mechanisms for the antenna, dielectric spacer, and ground plane, and a connection mechanism to form the electrical connection. A method of manufacturing the RFID device is also provided, involving positioning the components and forming the electrical connection.

Description

RFID DEVICE, SYSTEMS, AND METHODS OF MANUFACTURING THEREOF WITH ENHANCED ENVIRONMENTAL PERFORMANCEFIELD OF THE INVENTION

[0001] The present subject matter relates to radio frequency identification (RFID) devices and inlays, and configured for robust and reliable operation in challenging electromagnetic environments, and more particularly to methods and systems for manufacturing such RFID devices with precisely tuned antennas and improved electrical connections between conductive structures.BACKGROUND

[0002] Radio frequency identification (RFID) technology has emerged as a pivotal component in modern inventory management and supply chain logistics, offering unparalleled capabilities in contactless identification and tracking of myriad objects, products, and even biological entities. RFID inlays, comprising an integrated circuit (IC) chip symbiotically coupled with an antenna structure, facilitate the transmission of unique identifying data to RFID interrogators, thereby enabling automated processing and control of items across diverse applications. The RFID antenna, typically a metallic conductor, serves as the critical interface for electromagnetic energy transfer, enabling both power reception and data transmission. This sophisticated interplay between the IC and RFID antenna allows RFID systems to operate across various frequency bands, including low frequency (LF), high frequency (HF), and ultra-highfrequency (UHF), each offering distinct advantages in read range, data transfer rates, and environmental resilience.

[0003] The efficacy of RFID tags is profoundly influenced by the electromagnetic properties of the materials to which they are affixed or in close proximity. Conductive materials, particularly metals, and substances exhibiting high dielectric constants present formidable challenges to RFID functionality. Metallic surfaces, characterized by high electrical conductivity, induce eddy currents when exposed to electromagnetic fields, resulting in the reflection and attenuation of incident RF energy. This phenomenon can create null zones where tags become unreadable or experience significantly diminished read ranges. Concurrently, liquids, especially those with high water content, exhibit strong RF energy absorption characteristics due to their polar molecular structure. This absorption leads to RFID antenna detuning, altering the RFID tag's resonant frequency and consequently degrading its performance metrics, including read range and sensitivity.

[0004] The challenges posed by these materials are particularly pronounced in industries where RFID tagging of metallic containers, liquid-filled vessels, or protein-rich products is imperative. In the beverage industry, for instance, the tagging of aluminum cans or glass bottles that simultaneously contain liquids necessitate specialized RFID designs to overcome the dual challenges of metallic reflection and liquid-induced detuning. The food packaging sector, especially in meat processing, confronts a complex electromagnetic environment due to the high moisture and protein content of the products, often compounded by metallic or metalized packaging materials. Similarly, the automotive and aerospace industries grapple with the intricacies of tagging metal parts and components, where proximity to large metallic surfaces canseverely impair tag performance through near-field coupling effects and far-field pattern distortion. However, the existing solutions often entail increased production costs, complex manufacturing processes, or compromises in tag form factor and application challenges, limiting their universal applicability across diverse use cases. The industry continues to seek more elegant solutions that may provide robust performance without significantly increasing tag complexity or cost.

[0005] The manufacturing processes for these advanced RFID designs present additional technical hurdles that must be surmounted to achieve widespread adoption. Conventional RFID tag production methodologies, such as etching, screen printing, or metal stamping, may prove inadequate for fabricating tags capable of maintaining consistent performance in electromagnetically challenging environments. Furthermore, optimizing RFID performance for challenging surfaces, which includes precise deposition of dielectric spacers, application of specialized electromagnetic shielding coatings, or creation of complex 3D RFID antenna structures, necessitates development of novel manufacturing techniques. These may include advanced additive manufacturing processes, precision material deposition methods, or hybrid fabrication approaches that integrate multiple materials and structures within a single tag. Ensuring uniform performance across high-volume production runs of these specialized tags also presents significant quality control challenges, as minor variations in material properties or geometric tolerances can result in substantial deviations in tag performance metrics. Consequently, the RFID industry faces the dual imperative of advancing tag designs for robust operation in complex electromagnetic environments while concurrently developing scalable, cost-effective manufacturing processes to enable mass production of these sophisticated tags.

[0006] Therefore, a need exists to overcome the aforementioned limitations and challenges related to manufacturing RFID devices for challenging environments including tagging metals, high dielectric contents such as foods and beverages.SUMMARY

[0007] The following presents a simplified summary to provide a basic understanding of some aspects of the disclosed innovation. This summary is not an extensive overview and is not intended to identify key / critical elements or delineate the scope thereof. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description presented later.

[0008] According to an aspect of the present disclosure, a radio frequency identification (RFID) device is provided. The RFID device includes an antenna configured to operate at a predetermined frequency, a ground plane, and a dielectric spacer positioned between the RFID antenna and the ground plane. The dielectric spacer includes at least a thickness and dielectric constant configured, inter alia, to maintain the predetermined frequency and sensitivity of the RFID antenna when the RFID device is in proximity to items containing high dielectric constant materials. The RFID device also includes an electrical connection between the RFID antenna and the ground plane, the electrical connection being positioned and configured to achieve a desired loop length of the RFID antenna, thereby actively involving the ground plane in the antenna's resonant structure and tuning the RFID antenna to the predetermined frequency and enhancing its electrical properties for desired readability performance. This comprehensive tuning and interaction with the ground plane enhances the RFID antenna's electrical properties for desired readability performance, particularly when the device is applied to metallic items,other electromagnetically reflective surfaces, and / or items comprising high dielectric constant materials. In another aspect, a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the device comprising an RFID antenna, a ground plane, a dielectric spacer, and an electrical connection between the RFID antenna and the ground plane, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item and said electrical connection being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In yet another aspect, a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the device comprising an RFID antenna, a ground plane, a dielectric spacer, and an electrical connection between the RFID antenna and the ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item, and said electrical connection being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In a further aspect, a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, the device comprising an RFID antenna, a ground plane, a dielectric spacer, and an electrical connection between the RFID antenna and the ground plane, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, and said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID deviceis in proximity to the high-dielectric constant materials, and said electrical connection being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

[0009] According to some embodiments of the present disclosure, the electrical connection may be a weld positioned along a peripheral portion of the dielectric spacer, the positioning being configured to co-act with the ground plane to complete and tune the effective loop length of the RFID antenna to the predetermined frequency. The RFID antenna may include a conductive material selected from aluminum, copper, silver, or conductive ink. The ground plane may include a continuous layer of conductive material. The RFID device may further include an adhesive layer between the RFID antenna, the dielectric spacer, and the ground plane. The dielectric spacer may include a dielectric constant and thickness selected to provide impedance matching between the antenna and free space when the RFID device is applied to items containing high dielectric constant materials. The RFID antenna and the ground plane may be correlatively shaped and sized to create a predetermined radiation pattern that maintains RFID tag performance when applied to various surfaces. The electrical connection may be configured to create a controlled current distribution between the RFID antenna and the ground plane, thereby optimizing the radiation characteristics of the RFID device.

[0010] According to some embodiments of the present disclosure, a system for manufacturing a radio frequency identification (RFID) device is provided. The system includes a first supply mechanism configured to provide an RFID antenna configured to operate at a predetermined frequency, a second supply mechanism configured to provide a dielectric spacer over the RFID antenna, a third supply mechanism configured to provide a ground plane over thedielectric spacer, and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane. The system is configured to produce an arrangement of the RFID antenna, the dielectric spacer, and the ground plane such that at least the thickness of the dielectric spacer and dielectric constant maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials, and the connection mechanism is configured to form the electrical connection at a precise location to achieve a desired loop length for the RFID antenna, thereby tuning it to its predetermined frequency for desired readability performance . In another aspect, a system for manufacturing an RFID device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the system comprising a first supply mechanism configured to provide an RFID antenna, a second supply mechanism configured to provide a dielectric spacer over the RFID antenna, a third supply mechanism configured to provide a ground plane over the dielectric spacer, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane, said connection mechanism being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In yet another aspect, a system for manufacturing an RFID device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the system comprising a first supply mechanism configured to provide an RFID antenna, a second supply mechanism configured to provide a dielectric spacer overthe RFID antenna, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operationalfrequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item, a third supply mechanism configured to provide a ground plane over the dielectric spacer, and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane, said connection mechanism being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In a further aspect, a system for manufacturing a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, the system comprising a first supply mechanism configured to provide an RFID antenna, a second supply mechanism configured to provide a dielectric spacer over the RFID antenna, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric constant materials, a third supply mechanism configured to provide a ground plane over the dielectric spacer, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane, said connection mechanism being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

[0011] In some embodiments, the connection mechanism may include a welding device configured to create localized heating at specific points of contact between the RFID antenna and the ground plane. The welding device may be at least one of an inductive heating subsystem, a capacitive discharge heating subsystem, or a laser heating subsystem. The system may include a web transport mechanism configured to continuously move at least one of theRFID antennas, the dielectric spacer, or the ground plane during the manufacturing process. The system may further comprise a cutting mechanism configured to separate individual RFID devices after formation of the electrical connection.

[0012] According to some embodiments of the present disclosure, a radio frequency identification (RFID) inlay is provided. The RFID inlay includes a substrate having an RFID antenna disposed thereon, a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane, and the ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna. The RFID antenna is coupled to a chip, and the dielectric spacer includes at least a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the antenna when the RFID inlay is applied to items containing high dielectric constant materials. In some aspect, the ground plane is configured to shield the RFID antenna from electromagnetically reflective surfaces to ensure enhanced performance by preventing unwanted reflections. The ground plane may be physically and electrically connected to a portion of the antenna through a weld joint, said weld joint being positioned and configured to achieve a desired loop length of the RFID antenna, thereby tuning the RFID antenna to its operational frequency and enabling enhanced performance. The weld joint may be located along a peripheral portion of the dielectric spacer. The weld joint may include a series of spot welds. The antenna may include a strap carrying the RFID chip. In another aspect, a radio frequency identification (RFID) inlay is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the inlay comprising a substrate including an RFID antenna disposed thereon, a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna anda ground plane, and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In yet another aspect, a radio frequency identification (RFID) inlay is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the inlay comprising a substrate including an RFID antenna disposed thereon, a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID inlay is in proximity to the high-dielectric content item, and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna, wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. In a further aspect, a radio frequency identification (RFID) inlay is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item AND items comprising high dielectric constant materials, the inlay comprising a substrate including an RFID antenna disposed thereon, a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of theRFID antenna when the RFID inlay is in proximity to the high-dielectric constant materials, and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length. The weld joint may be located along a peripheral portion of the dielectric spacer. The weld joint may include a series of spot welds. The RFID antenna may include a strap carrying the RFID chip.

[0013] According to some embodiments of the present disclosure, a method of manufacturing a radio frequency identification (RFID) device is provided. The method includes providing an RFID antenna configured to operate at a predetermined frequency, positioning a dielectric spacer between the RFID antenna and a ground plane, providing the ground plane over the dielectric spacer, and forming an electrical connection between the antenna and the ground plane. The method is configured to form an arrangement of the RFID antenna, the dielectric spacer, and the ground plane such that a thickness of the dielectric spacer and dielectric constant, inter alia, maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials, and the ground plane shields the RFID antenna from electromagnetically reflective surfaces and high radiation absorbing surfaces to ensure enhanced performance by preventing unwanted reflections, and wherein the forming of the electrical connection is performed to achieve a desired loop length of the RFID antenna by connecting it to the ground plane, thereby tuning the RFID antenna tothe predetermined frequency and enabling its desired readability. In another aspect, a method of manufacturing a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the method comprising providing an RFID antenna, positioning a dielectric spacer between the RFID antenna and a ground plane, providing a ground plane configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length. In yet another aspect, a method of manufacturing a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high- dielectric content item, the method comprising providing an RFID antenna, positioning a dielectric spacer between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item, and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length. In a further aspect, a method of manufacturing a radio frequency identification (RFID) device is configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, the method comprising providing an RFID antenna, positioning a dielectric spacer between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antennawhen the RFID device is in proximity to the high-dielectric constant materials, providing a ground plane configured to shield the RFID antenna from electromagnetic interference caused by the metallic item, and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length. The method may include applying an adhesive between at least of the antenna, the dielectric spacer, and the ground plane.The foregoing general description of the illustrative embodiments and the following detailed description thereof are merely exemplary aspects of the teachings of this disclosure and are not restrictive. It is to be understood that features, aspects, and embodiments described herein in relation to a particular figure or claim category may be combined with, or incorporated into, other features, aspects, and embodiments described herein, unless technically or logically precluded. For instance, various features described in connection with an RFID device (e.g., materials, dimensions, or specific component integrations) may be applied to or incorporated within a specific RFID inlay, manufacturing system, or method, and vice versa. This inherent modularity and adaptability allow for a broad range of permutations and combinations of the disclosed features and embodiments to address diverse application requirements.DEFINTIONS

[0014] Electronic Device: refers to a device configured to perform an electronic function, typically involving the manipulation of electrical signals or data, and is understood to encompass a wide range of devices, for example, an RFID inlay, a smart card, a flexible sensor, or a miniaturized circuit package.

[0015] Electrically Conductive Component: describes a material or structure capable of conducting electricity, characterized by low electrical resistance, which may include, for instance, metals (e.g., aluminum, copper, silver) or conductive inks. Such components can be formed as traces, layers, or elements, and in an RFID device, an example would be the aluminum antenna pattern or a copper foil ground plane.

[0016] Dielectric Spacer I Dielectric Component / Dielectric Member / Dielectric Spacer Layer: refers to a material or structure that is a poor conductor of electricity, specifically designed to electrically separate conductive components, provide structural spacing, and / or impart specific electrical properties such as capacitance, impedance matching, or frequency stability within a device, for example, a thin polyethylene terephthalate (PET) film or a foam layer positioned between an RFID antenna and a ground plane to establish precise physical and electromagnetic separation.

[0017] Electrical and Mechanical Connection: describes a physical bond between two or more components that establishes a stable electrical pathway and simultaneously provides structural integrity, ensuring both electrical conductivity and mechanical stability between the joined parts, such as a localized weld joint or a bond formed by a conductive adhesive between the RFID antenna and the ground plane.

[0018] Maintains Electrical Isolation between portions: is understood to mean a configuration or process where, despite the formation of an electrical connection in specific, designated areas, other distinct or remaining portions of the electrically conductive components remain electrically separated by an insulating or dielectric material, thereby preventing unintended electrical pathways or short circuits across those other portions, for example, thedielectric member prevents the RFID antenna from shorting directly to the ground plane, except at precisely intended connection points for functional purposes.

[0019] Welding: describes a fabrication process that joins materials by causing coalescence, typically through heating the materials to their melting point and / or by applying pressure, and in the context of the present invention, involves localized heating to create a direct conductive bond between components, for instance, using ultrasonic energy to fuse an RFID antenna to a ground plane, or localized heat from a resistive element causing two conductive layers to melt and join.

[0020] Capacitive Discharge Welding: refers to a resistance welding process that utilizes the rapid discharge of electrical energy stored in capacitors to generate a high current pulse, creating intense, localized heat at the interface of materials to be joined, resulting in a direct electrical and mechanical bond with precise energy control and very short weld times, for example, a welding device that discharges 2000V from a capacitor bank in 500 microseconds to create a strong, clean weld point between conductive layers.

[0021] Spot Welds: are understood as discrete, localized electrical and mechanical connections formed by welding at small, defined points between components, typically circular or similarly bounded areas, as distinguished from a continuous seam weld, for instance, a series of tiny, distinct fused dots, each less than 1mm in diameter, along the edge of an RFID antenna connecting it to a ground plane.

[0022] Peripheral Portion: refers to a region located along or near the outer boundary, edge, or perimeter of a component (such as an insulating component or dielectric member), typically referring to the outer region where a connection is formed, as distinguishedfrom a central or inner region, for example, the outermost 2mm strip along the rectangular edge of a dielectric film where an RFID antenna is joined to a ground plane.

[0023] RFID Antenna / Antenna Structure: refers to an electrical component specifically designed to efficiently transmit or receive radio frequency (RF) electromagnetic waves at a predetermined frequency, serving as the primary component responsible for coupling the RFID device to the external electromagnetic field, and may include, for example, a folded dipole antenna pattern printed on a substrate, or a rectangular loop antenna within an RFID inlay.

[0024] Strap: describes a conductive element or portion of a conductive component, often elongated and narrow, that serves to electrically connect an integrated circuit (e.g., an RFID chip) to a larger RFID antenna or other conductive elements within the device, for instance, a small copper bridge connecting the pads of an RFID chip to the main antenna traces.

[0025] RFID Chip / Integrated Circuit (IC): refers to a microelectronic circuit, typically formed on a semiconductor substrate, that contains the necessary logic, memory, and circuitry for an RFID device to store data and communicate wirelessly, such as the small silicon die that enables an RFID tag to respond to a reader's query and store product information.

[0026] Continuous Layer of Conductive Material: means a substantially unbroken or uninterrupted sheet, film, or layer of electrically conductive material, typically spanning a significant area, which may serve various functions, for example, a solid sheet of aluminum foil functioning as a ground plane beneath an RFID antenna, providing a consistent reflective surface.

[0027] Web Transport Mechanism / Web: describes a system or apparatus configured to continuously move a flexible, sheet-like material (e.g., film, substrate, metal foil, paper) from a supply roll to a take-up roll, or through various processing stations, thereby facilitating high-volume, automated manufacturing processes, such as a series of rollers and guides moving a long roll of pre-printed antenna substrate through a welding station.

[0028] Non-Contact Welding Technique: refers to a welding method where the energy source or welding apparatus does not physically touch the materials being joined during the energy application phase, for example, using a focused laser beam to melt and fuse conductive layers without the laser head ever touching the RFID inlay.

[0029] Manufacturing System / System / Apparatus: refers to a collection of interconnected components, mechanisms, or subsystems designed to work cohesively to perform a specific manufacturing process, typically encompassing mechanisms for supplying, positioning, processing, and connecting components, for instance, an automated assembly line comprising feeders for RFID antenna and dielectric layers, a precision welding station, and a finished product take-up spool.

[0030] Supply Mechanism / Component Supply Mechanism: describes a module or device within a manufacturing system configured to dispense, feed, or transport a specific component (e.g., an RFID antenna, dielectric member, ground plane, or adhesive) from its source to a designated position within the assembly process, for example, an unwinder unit that feeds a continuous roll of conductive material to a cutting and positioning station.

[0031] Connection Mechanism: refers to a functional unit or subsystem within an apparatus or manufacturing system configured to execute the process of forming an electrical and mechanical connection between components, such as the welding head assembly responsible for applying the energy and pressure to form the weld joint.

[0032] Localized Heating: describes the application of thermal energy to a confined, precise, or specific area of materials to facilitate joining, melting, or bonding, without significantly affecting surrounding or adjacent areas of the materials, for instance, the heat generated solely at the interface between the RFID antenna and the ground plane at a tiny spot, leaving the rest of the components cool.

[0033] Inductive Heating Subsystem: refers to a part of a welding device or connection mechanism that generates heat within electrically conductive materials by means of electromagnetic induction, typically by inducing circulating electrical currents (eddy currents), for the purpose of forming a weld or bond, for example, a high-frequency coil placed near the weld point, generating a magnetic field that heats the conductive layers to their melting point for bonding.

[0034] Laser Heating Subsystem: describes a part of a welding device or connection mechanism that utilizes concentrated laser beams to precisely heat and join materials by localized melting and solidification, such as a fiber laser directed to a specific point on the conductive layers to create a clean weld spot.

[0035] Control System / Control Unit: means an electronic or computational system configured to monitor, regulate, and adjust various parameters of a manufacturing process or device operation (e.g., weld parameters, voltage, current, discharge time, tension, position) based on pre-programmed instructions, algorithms, or real-time feedback, for instance, a computerized unit that monitors weld temperature and adjusts the energy discharge to ensure consistent weld quality, or that regulates the speed of the web transport mechanism.

[0036] Conductive Pathway through non-conductive portions: refers to an electrically conductive route formed through a material that is generally non-conductive or insulating, typically created by highly localized breakdown, melting, or modification of the non-conductive material (e.g., dielectric) to establish a direct electrical connection between otherwise separated conductive elements, for example, during welding, a small, precise channel of melted and resolidified dielectric material creates a conductive bridge connecting conductive layers that were previously separated by that dielectric.

[0037] Roll-to-Roll Format: describes a manufacturing process configuration where flexible materials (e.g., substrates, films, foils, webs) are continuously unwound from one roll, processed through various stations, and then rewound onto another roll, thereby enabling high- throughput and efficient production, such as the production of thousands of RFID inlays per minute as rolls of RFID antenna and dielectric material continuously feed through a welding machine.

[0038] Tension Control System: refers to an apparatus or mechanism within a manufacturing system configured to precisely regulate and maintain a consistent level of mechanical tension on flexible materials (e.g., webs, films) as they are transported or processed, preventing stretching, wrinkling, misalignment, or breakage, for example, a system using load cells and motor controls to ensure a constant pulling force on the dielectric film as it moves through the welding station.

[0039] Read Sensitivity: describes a measure of the minimum radio frequency (RF) power level at which an RFID chip, strap, or tag can reliably be detected, powered, and communicate data back to an RFID reader, where a lower (more negative) decibel-milliwatts(dBm) value indicates better sensitivity, for example, an RFID chip with a read sensitivity better than -18 dBm, meaning it can be read even with very weak signals.

[0040] Dielectric Constant: means a fundamental electrical property of an insulating material, also known as relative permittivity, that quantifies its ability to store electrical energy in an electric field when an external electric field is applied, and it directly influences the speed of electromagnetic waves propagating through the material and is a critical parameter for antenna tuning and impedance matching, for instance, a dielectric member made of a material with a dielectric constant in the range of 2 to 5, specifically chosen to optimize RFID antenna performance.

[0041] Resistance (of weld / connection): refers to a measure of the opposition to the flow of direct or alternating electric current through an electrical connection or weld joint, where a lower resistance value indicates a more efficient and robust electrical pathway for signal transfer, for example, a weld joint exhibiting an electrical resistance less than 1 ohm, ensuring excellent electrical conductivity.

[0042] Pull Strength (of weld / connection): describes a measure of the mechanical force required to break or separate an electrical and mechanical connection (e.g., weld joint) when subjected to a tensile or pulling load, indicating its mechanical durability and bond integrity of the connection, for instance, a weld joint capable of withstanding a pull strength greater than 1 Newton before mechanical failure.

[0043] Substrate: means a base material or supporting layer upon which other components (e.g., conductive structures, RFID antennas, dielectric members) of an electronicdevice or RFID inlay are disposed, attached, or structurally supported, for example, a flexible PET film that provides the structural base for the RFID inlay components.

[0044] Effective Radio Frequency (RF) Readability: refers to the capability of an RFID device to reliably establish and maintain wireless communication with an RFID reader, characterized by consistent data transfer, a sufficient read range, and stable performance, particularly when the device is operating in electromagnetically challenging environments such as proximity to metallic items or high-dielectric content items, for example, an RFID tag attached to a metal container that can be successfully scanned from 3 meters away, despite the presence of the metal.

[0045] Metallic Item and / or metallic surface: refers to any object or material predominantly composed of metal or having a significant metallic component (e.g., metal packaging, containers, or surfaces) that may reflect, absorb, or otherwise interfere with radio frequency energy, potentially degrading RFID tag performance, for instance, a beverage can, a metal asset tag, or a shipping container made of aluminum or steel.

[0046] High-Dielectric Content Item: describes an item or material characterized by a high dielectric constant (relative permittivity) that may substantially interact with, absorb energy from, and detune the electromagnetic field of an RFID antenna, for example, a bottle of water, a package of meat, fresh fruit, or a container of liquid chemicals.

[0047] Loop Length (of RFID antenna): means the effective electrical or physical path length of the RFID antenna as it interacts with other conductive elements, particularly a ground plane, to form a resonant circuit, where this length directly determines the antenna's fundamental resonant frequency and its impedance characteristics, for instance, the totalconductive path created by the RFID antenna's traces combined with the portion of the ground plane engaged by the peripheral connection, resulting in an electrical length optimized for 915 MHz.

[0048] Tuning (of RFID antenna): refers to the precise process or state of adjusting the electrical properties (e.g., resonant frequency, impedance) of the RFID antenna to match a desired operational frequency, typically by controlling its effective loop length and its interaction with a ground plane, thereby optimizing the antenna for efficient energy transfer and wireless communication at the predetermined frequency, for example, the final adjustment of the antenna's resonance to 915 MHz, achieved by selecting the exact point of connection between the RFID antenna and the ground plane at the periphery.

[0049] Optimize Impedance Matching: describes adjusting the electrical impedance of components or an overall system to minimize signal reflection and maximize power transfer between them, and in the context of the invention, specifically refers to achieving an efficient impedance match for the RFID antenna despite the presence of challenging environmental materials (e.g., metallic items, high-dielectric content items), for instance, designing the thickness of the dielectric spacer and the location of the electrical connection to achieve a 50- ohm impedance match for the RFID antenna when it's placed on a package containing liquid.

[0050] Predetermined Frequency: means a specific radio frequency or a narrow frequency band at which the RFID device is designed and intended to operate efficiently and consistently, typically conforming to established RFID standards, for example, the RFID device being designed to operate at 915 MHz, falling within the UHF RFID band.

[0051] Stable Operational Frequency: refers to the property of an RFID device where its actual operating or resonant frequency remains substantially consistent and within an acceptable tolerance range, even when subjected to environmental factors (e.g., proximity to high-dielectric materials or metal) that would typically cause a significant frequency shift or detuning, for example, an RFID tag whose resonant frequency deviates by less than 5 MHz from its target 915 MHz when placed on a water bottle.

[0052] Arrangement: refers to the specific spatial configuration, relative positioning, and interrelationship of multiple components within the electronic device or system, including how the components are physically situated, oriented, and connected to each other, where this precise spatial design is fundamental to enabling specific electromagnetic interactions (e.g., RFID antenna tuning, electromagnetic shielding, impedance matching) that are critical for achieving particular performance characteristics, especially when addressing challenges posed by certain operating environments, for example, the layered arrangement of the RFID antenna, dielectric member, and ground plane, with the electrical connection specifically located at the peripheral edge, is a critical arrangement for achieving the desired antenna tuning and environmental robustness.

[0053] Electromagnetically Reflective Surfaces: describes surfaces that significantly reflect radio frequency (RF) electromagnetic waves, potentially causing interference, signal degradation, or changes in an RFID antenna's performance characteristics, where these surfaces typically consist of electrically conductive materials or materials with high permittivity, and their presence can lead to detrimental effects like signal cancellation or detuning, for instance, themetal casing of an electronic device, a foil-lined package, a large metallic shelf near where anRFID tag is placed, or even a concrete wall depending on frequency.

[0054] Co-act / Co-acting: means two or more components or elements that function together, cooperate, or interact synergistically to achieve a combined effect that is greater than or qualitatively different from the sum of their individual contributions, where each component plays an essential role in this combined operation for the intended outcome, for example, the peripheral weld co-acting with the ground plane to extend the effective electrical length of the RFID antenna, rather than each element simply performing its own function in isolation.

[0055] Configured to / Designed to: refers to terms indicating that an element, component, or system has been specifically adapted, arranged, shaped, structured, programmed, or otherwise prepared to perform a particular function or achieve a specific result, implying a deliberate engineering choice or intrinsic capability rather than a mere incidental or potential function, for example, the dielectric spacer layer is configured to reduce frequency shift, meaning its thickness and material properties were intentionally selected and designed for this specific purpose.

[0056] Enhanced Readability Performance: describes the capability of an RFID device to achieve and maintain superior or optimized radio frequency (RF) communication capabilities (e.g., consistent data transfer, sufficient read range, stable operational frequency, high sensitivity) when deployed in electromagnetically challenging environments, where this "enhancement" signifies an improvement over the performance degradation typically expected in such environments or an advancement beyond the capabilities of conventional RFID devices operating under similar challenging conditions, and it specifically applies to deployment on or inproximity to metallic items, electromagnetically reflective surfaces, and / or high-dielectric content materials, where an RFID device's inherent electrical properties would otherwise be severely compromised or rendered ineffective, for instance, an RFID device achieving a reliable read range of 3 meters when attached to a metal container, or maintaining a stable resonant frequency within 5 MHz of its target when immersed in a liquid-filled package, where standard RFID tags would fail or exhibit severely reduced performance.BRIEF DESCRIPTION OF DRAWINGS

[0057] FIGs. 1A-C illustrate an RFID device, in accordance with an embodiment herein;

[0058] FIG. 2 illustrates a system for manufacturing of the RFID device 100, in accordance with an embodiment herein;

[0059] FIG. 3 illustrates a diagrammatic view of a system for manufacturing RFID inlays by inductive welding, in accordance with an embodiment herein;

[0060] FIG. 4 illustrates a diagrammatic view of a system for manufacturing RFID inlays by capacitive discharge welding, in accordance with an embodiment herein;

[0061] FIG. 5 illustrates an illustration of an RFID inlay, in accordance with an embodiment herein;

[0062] FIG. 6 illustrates an exemplary RFID device, in accordance with an embodiment herein;

[0063] FIG. 7 illustrates a method of manufacturing a radio frequency identification(RFID) device, in accordance with an embodiment herein;

[0064] FIG. 8 illustrates a method for manufacturing a radio frequency identification(RFID) device configured for stable resonant frequency and enhanced performance in high dielectric or reflective environments, in accordance with an embodiment herein; and

[0065] FIG. 9 illustrates a method for manufacturing a radio frequency identification (RFID) device, in accordance with an embodiment herein.DETAILED DESCRIPTION

[0066] The subject matter of the invention is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, numerous specific details are set forth in order to provide a thorough understanding thereof. It may be evident, however, that the present subject matter can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate a description thereof.

[0067] The present subject matter addresses the technical challenges associated with RFID tag performance on electromagnetically challenging surfaces by introducing an RFID device and manufacturing method for RFID devices. The present subject matter relates to a configuration in the strategic arrangement of a dielectric spacer 106 between an RFID antenna 102 and a ground plane 104, separated by a dielectric spacer, where an electrical connection between the RFID antenna and a ground plane is precisely positioned and configured to achieve a desired effective electrical loop length of the RFID antenna. This specific loop length actively tunes the RFID antenna to its predetermined operational frequency, which is crucial for maintaining stable performance (such as ensuring stable operational frequency) in adverse environments. Furthermore, the ground plane, by virtue of its arrangement and its shieldingfunction, minimizes interference from electromagnetically reflective surfaces. The electrical connection, configured in a manner and position, inter alia, allows for a controlled current distribution that optimizes the radiation characteristics of the RFID device. The properties of the dielectric spacer, including at least the thickness and dielectric constant are specifically configured to maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials. The electrical connection between the antenna and the ground plane, created through welding techniques such as, but not limited to, capacitive discharge or inductive heating, allows for a controlled current distribution that optimizes the radiation characteristics of the RFID device. This synergistic action of precise tuning and effective shielding ensures robust operation even when the RFID device is applied to items presenting a combined challenge, such as metallic containers filled with high-dielectric liquids.

[0068] Throughout the present subject matter, the RFID device design may be implemented in various industries where traditional RFID tags have struggled to perform effectively. In the beverage industry, for instance, these RFID devices may be reliably attached to aluminum cans or glass bottles which simultaneously contain liquids, specifically overcoming the combined challenges of metallic reflection and liquid-induced detuning challenges. In the food packaging sector, particularly for meat products with high moisture and protein content, RFID device of the present subject matter enables efficient performance in the presence of high dielectric materials and ensures consistent readability. The automotive and aerospace industries benefit from the capability of the RFID device to function when attached to metal parts and components, where the shielding effect of the ground plane, inter alia, mitigates the interferenceT1from large metallic surfaces. This versatility significantly expands the applicability of RFID technology in sectors where it was previously limited due to environmental and material constraints.

[0069] The present subject matter provides the manufacturing system and method that allows for the production of these advanced RFID devices at scale, utilizing techniques such as reel-to-reel processing and automated welding, which were challenging to implement with previous designs. The ability to create a robust and precisely positioned electrical connection and configuration between the RFID antenna and ground plane through controlled welding processes ensures consistent tuning, operational frequency and performance across large production runs, addressing a key limitation of earlier manufacturing methods. Additionally, the present subject matter approaches in maintaining the predetermined frequency and sensitivity through careful design of the dielectric spacer eliminates the need for complex and costly specialized materials or structures used in some prior solutions. This results in an RFID device that not only performs reliably in challenging environments but also maintains a form factor and production cost that makes it commercially viable for widespread adoption across various industries.

[0070] FIGs. 1A-C are illustrations of an RFID device 100, in accordance with an embodiment. In some embodiments, the RFID device 100 includes an RFID antenna 102, a ground plane 104 and a dielectric spacer 106. In some embodiments, the RFID device 100 includes an electrical connection 108 between the antenna 102 and the ground plane 104. In some embodiments, the RFID antenna 102 and the ground plane 104 includes a peripheral portion 110. In some embodiments, the electrical connection 108 includes a weld joint 112. In some embodiments, the weld joint includes a series of spot welds 114. In some embodiments, thedielectric spacer 106 includes an edge 116. In some embodiments, the RFID antenna 102 includes a strap 118 carrying an RFID chip 120.

[0071] In some embodiments, the RFID antenna 102 is configured to operate at a predetermined frequency. This configuration allows for optimized performance within specific frequency bands, which may be selected based on regulatory requirements, application-specific needs, or to ensure compatibility with particular RFID reader systems. The predetermined frequency may fall within the ultra-high frequency (UHF) range, typically between 860 MHz and 960 MHz, which is commonly used for RFID applications due to a balance of read range and data transfer capabilities. By designing the RFID antenna 102 to resonate at a specific frequency, the RFID device can achieve maximum power transfer efficiency, leading to improved read ranges and reliability. Furthermore, this precise frequency tuning enables the RFID antenna 102 to maintain performance characteristics even when the RFID device is placed in proximity to materials with high dielectric constants or on metallic surfaces, which traditionally pose challenges for RFID tag operation.

[0072] In some embodiments, the RFID antenna 102 includes a conductive material selected from aluminum, copper, silver, or conductive ink. These materials are chosen for their excellent electrical conductivity properties, which are crucial for optimal antenna performance. The selection of the specific conductive material may depend on factors such as cost, durability, and manufacturing process compatibility. For example, aluminum and copper may be preferred for their balance of conductivity and cost-effectiveness, while silver offers superior conductivity but at a higher price point, and conductive ink may be selected for its flexibility in printing processes and potential for cost-efficient large-scale production.

[0073] In some embodiments, the antenna 102 includes a strap 118 carrying an RFID chip 120. The strap 118, a small assembly containing the RFID chip 120 and connection points, facilitates easier and more reliable attachment of the RFID chip 120 to the antenna 102. This configuration allows for greater flexibility in manufacturing, as the strap 118 can be produced separately and then efficiently attached to the antenna 102 during the assembly process. The use of a strap 118 can also improve the overall durability of the RFID device 100 by providing additional protection to the RFID chip 120 and its connections.

[0074] In some embodiments, the ground plane 104 includes a continuous layer of conductive material. This continuous layer of conductive material improves the performance and functionality of the RFID device 100. In some embodiments, the ground plane 104 ensures uniform shielding across the entire antenna area, effectively isolating the antenna 102 from the potentially interfering effects of the surface to which the RFID device 100 is attached. Secondly, a continuous ground plane helps to maintain a consistent impedance across the antenna 102, which is crucial for optimal power transfer and signal integrity. The use of a continuous conductive layer also contributes to the overall structural integrity of the RFID device 100, potentially increasing its durability and lifespan.

[0075] In some embodiments, the ground plane 104 is configured to shield the RFID antenna 102 from electromagnetically reflective surfaces to ensure enhanced performance by preventing unwanted reflections. This shielding effect is crucial when the RFID device 100 is attached to or in close proximity to metallic objects or other materials with high electromagnetic reflectivity. By acting as a barrier and / or a mirror, the ground plane 104 minimizes the interference caused by these reflective surfaces, which could otherwise distort radiation patternand reduce the efficiency of the RFID antenna 102. The prevention of unwanted reflections helps maintaining designed characteristics of the RFID antenna 102, ensuring consistent read ranges and reliability across various environments. Additionally, the shielding properties of the ground plane 104 may allow for a more compact RFID design, as the ground plane 104 reduces the need for additional spacing between the antenna 102 and a mounting surface of an item. This configuration improves and advances the overall performance of the RFID device 100 and also expands to potential applications, such as but not limited to metallic objects or materials with high electromagnetic reflectivity. Furthermore, the RFID device of the present subject matter does not suffer from specific application needs typical of conventional solutions; for instance, unlike traditional flag tags, the antenna does not require careful physical spacing apart from challenging environments such as metallic surfaces, contributing to a more streamlined and versatile application. This inherent application simplicity directly translates to manufacturing ease, as the device can be produced as a single, compact, and flat unit without the need for complex pre-folding, specialized post-production assembly steps, or larger material layouts often associated with flag-tag designs. This contributes to higher production throughput, reduced material waste, and lower overall manufacturing costs, reflecting the practical advancement of technology and its advantages.

[0076] In some embodiments, the RFID antenna 102 and the ground plane 104 are correlatively shaped and sized to create a predetermined radiation pattern that maintains the performance of the RFID device 100 when applied to various surfaces. The correlated design of the RFID antenna 102 and ground plane 104 allows for optimized electromagnetic coupling between these components, enhancing the overall efficiency of the RFID device 100. Thisconfiguration enables the RFID device 100 to maintain consistent read ranges and signal strength across different mounting environments, including metallic surfaces, liquids, and other challenging materials. By carefully tuning the dimensions and geometries of the antenna 102 and ground plane 104, the RFID device 100 can achieve a balanced performance across multiple frequency bands, accommodating regional variations in RFID regulations. The correlated shaping may also contribute to the miniaturization of the RFID device 100, allowing for compact designs without sacrificing performance. By using a predetermined radiation pattern resulting from this correlative shaping, it enables the mitigation of the effects of material-specific interference, such as detuning or signal attenuation, which may occur when the RFID device 100 is attached to surfaces with varying electromagnetic properties. By maintaining a stable radiation pattern, the RFID device 100 can achieve reliable read rates and consistent performance whether it is applied to metallic, dielectric, or composite materials.

[0077] In some embodiments, the RFID device 100 includes the dielectric spacer 106 positioned between the RFID antenna 102 and the ground plane 104. The dielectric spacer 106 serves as a crucial component in the RFID device 100, providing physical separation and electromagnetic isolation between the RFID antenna 102 and the ground plane 104. This separation is essential for maintaining a proper functioning of the RFID antenna 102, as it helps to prevent direct electrical contact between the antenna 102 and the ground plane 104, which could otherwise lead to short-circuiting or undesired coupling effects. The dielectric spacer 106 may be composed of materials with specific dielectric properties, chosen to optimize the performance of the RFID device 100 in a desired frequency range (for example, a frequency in a range of 860 MHz to 960 MHz) and operating environment.

[0078] In some embodiments, the dielectric spacer 106 has certain properties that include at least a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the antenna 102 when the RFID device 100 is in proximity to items containing high dielectric constant materials, or other challenging environments. The thickness of the dielectric spacer 106 is specifically designed to maintain a predetermined separation between the top of the RFID antenna 102 and the ground plane 104, thereby preventing a substantial frequency shift and sensitivity drop of the antenna 102 when the RFID device 100 is applied to items containing high dielectric constant materials. This separation, in conjunction with the electrical connection's position, enables the precise establishment of the antenna's effective loop length for accurate tuning and ensuring stable operating frequency in challenging environment. This careful design ensures that the RFID device 100 may operate effectively in various environments, including those with materials that typically interfere with radio frequency signals, such as metals and high dielectric materials. Furthermore, the dielectric spacer 106 is believed to be critical in providing the necessary controlled separation that enables the ground plane 104 to effectively co-act with the RFID antenna 102 as part of its resonant structure.

[0079] It is to be understood that the effective performance of the RFID device 100 in challenging environments is believed to stem from the synergistic interplay between the dielectric spacer 106 and the ground plane 104, each contributing distinct yet complementary roles. For high-dielectric content items, the dielectric spacer 106 is primarily configured with specific thickness and dielectric constant to mitigate capacitive loading and maintain the RFID antenna's 102 stable operational frequency and sensitivity. For metallic items or electromagnetically reflective surfaces, the ground plane 104 is primarily configured to shield theRFID antenna 102 from interference and unwanted reflections. Crucially, it is a design principle that in all these scenarios (whether metallic, high-dielectric, or combined), the ground plane 104 also functions as an integral part of the RFID antenna's 102 resonant structure. The electrical connection 108 precisely defines the antenna's effective loop length, and this precise loop length contributes to accurately tuning the RFID antenna 102 to its predetermined frequency. This direct control over the effective loop length is what enables the RFID antenna to resist detuning and optimize its impedance and radiation characteristics, thereby achieving robust and reliable readability across individual challenges and particularly in combined challenging environments (e.g., metallic containers with high-dielectric contents)

[0080] In some embodiments, the dielectric constant of the dielectric spacer 106 is selected in conjunction with its thickness to provide optimal impedance matching between the RFID antenna 102 and free space when the RFID device 100 is applied to items containing high dielectric constant materials or other challenging environments. This impedance matching is crucial for maintaining the efficiency of the RFID antenna 102 and ensuring reliable communication between the RFID device 100 and an RFID reader. By carefully controlling these parameters, the dielectric spacer 106 enables the RFID device 100 to maintain its performance characteristics across a wide range of application scenarios, from low-dielectric environments to those with high-dielectric environments. The dielectric constant, which may range from 1-4. Preferably, the dielectric constant may range from 2 to 5, and can be particularly selected for this purpose.

[0081] In some embodiments, the dielectric spacer 106 includes a thickness in a range of 200 micrometers to 1500 micrometers. This specific range of thickness has been determinedto provide an optimal balance between compactness and performance stability of the RFID device 100. The determination of this thickness is influenced by various factors, including the intended operating frequency (and corresponding wavelength), the dielectric constant of the spacer material, the desired impedance matching, and the specific electromagnetic environment in which the RFID device 100 is designed to perform (e.g., proximity to metallic items and / or high- dielectric content materials). In a particular embodiment, the dielectric spacer 106 may have a thickness of approximately 0.5 mm (500 micrometers). Furthermore, the thickness of the dielectric spacer 106 is configured to maintain a predetermined separation between the RFID antenna 102 and the ground plane 104, thereby preventing a substantial frequency shift and sensitivity drop of the RFID antenna when the RFID device 100 is applied to items containing high dielectric constant materials. At the lower end of this range, the 200 micrometers thickness may allow for very thin and flexible RFID devices 100, suitable for applications where space is at a premium or where the RFID device 100 needs to conform to curved surfaces. In some embodiments, the upper end, the 1500 micrometers thickness may provide enhanced isolation and stability on challenging surfaces, particularly useful in high-interference environments.

[0082] In some embodiments, the dielectric spacer 106 includes a dielectric constant in a range of 1 to 6, or 1- 4 more preferably in a range of 2 to 5. This specific range of dielectric constants has been carefully selected to optimize the performance of the RFID device 100 across various operating environments. A dielectric constant in this range allows the dielectric spacer 106 to effectively isolate the RFID antenna 102 from the ground plane 104 while maintaining the desired electromagnetic properties of the overall structure. The lower end of the range, closer to 1, may be suitable for applications where minimal interference with the RFID antenna's 102radiation pattern is required, while values closer to 4, or 5, or 6 may provide better isolation in more challenging electromagnetic environments.

[0083] In some embodiments, the dielectric spacer 106 includes a dielectric constant and thickness selected to provide impedance matching between the RFID antenna 102 and free space when the RFID device 100 is applied to items containing high dielectric constant materials. This careful selection of dielectric properties is crucial for maintaining optimal performance of the RFID device 100 in challenging environments. The dielectric constant, which may range from 1 to 6, or preferably in the range of 2 to 5 and the thickness, which may range from 0.2 mm to 1.5 mm (or micrometer equivalent), are specifically chosen to create an electromagnetic environment that allows the antenna 102 to radiate efficiently even when in close proximity to materials that would typically detune or absorb RF energy. In various embodiments, the thickness of the dielectric spacer may range from approximately 0.2 mm to 1.5 mm to accommodate different application requirements and substrate characteristics. In certain preferred embodiments, a more specific thickness range of approximately 0.01 mm to 0.2 mm is employed to achieve optimal electromagnetic performance while maintaining minimal form factor.

[0084] By providing appropriate impedance matching, the dielectric spacer 106 helps to minimize reflections and maximize power transfer between the antenna 102 and free space. This is particularly important when the RFID device 100 is attached to items with high dielectric constants, such as liquids, metals, or moist materials, which can significantly alter the RFID antenna's 102 impedance characteristics. The optimized impedance matching ensures that the RFID device 100 maintains its read range and sensitivity across a wide range of applicationscenarios, from low-dielectric environments to those with high-dielectric materials in close proximity.

[0085] In some embodiments, a choice of dielectric constant within this range, which may range from 1 to 6 or 1-4, may be tailored to specific application requirements. For example, a lower dielectric constant may be preferred when the RFID device 100 is intended for use in free space or low-dielectric environments, as it may allow for a more efficient radiation pattern. Conversely, a higher dielectric constant within this range may be beneficial when the RFID device 100 is expected to be in close proximity to materials with high dielectric constants, as it may help maintain the RFID antenna's 102 performance characteristics by providing enhanced isolation.

[0086] In some embodiments, the RFID device 100 includes an electrical connection 108 between the RFID antenna 102 and the ground plane 104. This electrical connection 108 plays a crucial role in the overall performance and functionality of the RFID device 100. By establishing, a conductive pathway between the RFID antenna 102 and the ground plane 104, the electrical connection 108 allows for controlled current distribution, which is essential for optimizing the radiation characteristics of the RFID device 100. This controlled current flow helps to shape the radiation pattern of the RFID antenna 102, improve its efficiency, and enhance its overall performance across various operating conditions. In some embodiments, the electrical connection includes a resistance less than 1 ohm and a pull strength greater than 1 Newton.

[0087] In some embodiments, the RFID device 100 is specifically configured for enhanced readability performance when applied to or in proximity to metallic items. As illustrated conceptually by the RFID device 100 in FIGs. 1A-C (and also 106 of FIG. 6 and other corresponding elements of FIG.6), such a device comprises an RFID antenna 102, a ground plane104, a dielectric spacer 106 positioned between them, and an electrical connection 108. For metallic item applications, the ground plane 104 is critically configured to shield the RFID antenna 102 from electromagnetic interference caused by the metallic item, thereby mitigating signal absorption, detuning, and pattern distortion typically associated with metal proximity. Concurrently, the electrical connection 108 is strategically positioned and configured to tune the RFID antenna 102 to its operational frequency by influencing its effective loop length, ensuring stable resonant characteristics even when the antenna is operating in the near-field of the metallic surface. This synergistic action of shielding by the ground plane and precise tuning via loop length enables robust RF readability for metallic tagging applications. For example, such a device may include an RFID antenna 102 formed from aluminum, configured to operate at 915 MHz, and further comprise a strap 118 carrying an RFID chip 120. The electrical connection 108 may be a weld joint 112 positioned along a peripheral portion 110 of the dielectric spacer 106, and may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton.

[0088] In other embodiments, the RFID device 100 is specifically configured for enhanced readability performance when applied to or in proximity to a high-dielectric content item. As shown in FIGs. 1A-C (and also in FIG. 6 with other corresponding elements), this device also includes an RFID antenna 102, a ground plane 104, a dielectric spacer 106, and an electrical connection 108. For high-dielectric content item applications, the dielectric spacer 106 is critically designed with specific properties, such as at least a thickness and dielectric constant, configured to maintain a stable operational frequency of the RFID antenna 102 by counteracting the capacitive loading and detuning effects inherent to such materials. Simultaneously, the electrical connection 108 is positioned and configured to tune the RFID antenna 102 to its operationalfrequency by influencing its effective loop length, ensuring efficient power transfer and reliable communication even when the RFID device is surrounded by high-dielectric media. This dual approach of dielectric-based stability and precise loop-length tuning guarantees effective RF readability for high-dielectric tagging applications. For instance, the dielectric spacer 106 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 1-5, or 2 to 5. This device may also include an RFID antenna 102 made of copper, further comprising a strap 118 carrying an RFID chip 120. The ground plane 104 may be a continuous layer of conductive material. The electrical connection 108 may be a weld joint 112 positioned along a peripheral portion 110 of the dielectric spacer 106, said peripheral portion having an area within 2 mm of an edge 116 of the dielectric spacer. This weld joint 112 may comprise a series of spot welds 114, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton.

[0089] In yet another embodiment, the RFID device 100 in FIG.l (also in FIG 6 with other corresponding elements) is uniquely configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, such as a metal beverage can filled with a liquid. In this particularly challenging scenario, the device comprises an RFID antenna 102, a ground plane 104, a dielectric spacer 106 positioned between them, and an electrical connection 108. The ground plane 104 is configured to shield the RFID antenna 102 from electromagnetic interference caused by the metallic item, while the dielectric spacer 106 (with its specific thickness and dielectric constant) is configured to maintain a stable operational frequency of the RFID antenna 102 when inproximity to the high-dielectric content. Simultaneously, the electrical connection 108 precisely tunes the RFID antenna 102 to its operational frequency by influencing its effective loop length. This synergistic design, believed to be combining the ground plane's shielding and the dielectric spacer's detuning mitigation, along with the precise loop length tuning, allows the device to function reliably where a single-solution tag would fail due to the combined interference. In an exemplary embodiment for a beverage can, the RFID antenna 102 may comprise silver ink, further comprising a strap 118 carrying an RFID chip 120. The ground plane 104 may be a continuous layer of conductive material. The dielectric spacer 106 may have a thickness of 0.5 mm (500 micrometers) and a dielectric constant in a range of 1 to 4. The electrical connection 108 may be a weld joint 112 positioned along a peripheral portion 110 of the dielectric spacer 106, said peripheral portion having an area within 2 mm of an edge 116 of the dielectric spacer. This weld joint 112 may comprise a series of spot welds 114, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. This device may further operate in the UHF range (860 MHz to 960 MHz).

[0090] In some embodiments, the electrical connection 108 is configured to create a controlled current distribution between the RFID antenna 102 and the ground plane 104, thereby optimizing the radiation characteristics of the RFID device 100. This controlled current distribution plays a crucial role in shaping the electromagnetic field generated by the RFID device 100, influencing factors such as radiation pattern, gain, and efficiency. By carefully designing the electrical connection 108, the current flow between the RFID antenna 102 and the ground plane 104 may be manipulated to enhance the overall performance of the RFID device 100 acrossvarious operating conditions. This configuration may help in achieving a more uniform radiation pattern, reducing null zones, or enhancing the RFID device's 100 ability to operate effectively when attached to materials with high dielectric constants. Additionally, an optimized current distribution of the RFID device 100 may contribute to improved impedance matching between the RFID antenna 102 and the RFID chip 120, maximizing power transfer and extending the read range of the RFID device 100.

[0091] The configuration of the electrical connection 108 may involve strategic placement of connection points, such as the weld joint 112. This arrangement may create specific current paths that contribute to the desired radiation characteristics. For instance, the controlled current distribution may help in achieving a more uniform radiation pattern, reducing null zones, or enhancing the RFID device's 100 ability to operate effectively when attached to materials with high dielectric constants. Additionally, the optimized current distribution may contribute to improved impedance matching between the RFID antenna 102 and the RFID chip 120, maximizing power transfer and extending the read range of the RFID device 100.

[0092] In some embodiments, the electrical connection 108 includes the weld joint 112 positioned along the peripheral portion 110 of the antenna 102 and the ground plane 104. In some other embodiments, the electrical connection 108 includes the weld joint 112 positioned along the peripheral portion 110 of the dielectric spacer 106, said positioning being configured to achieve a desired loop length of the RFID antenna 102 by connecting it to the ground plane 104, thereby actively tuning the RFID antenna 102 to its predetermined frequency. This strategic placement of the weld joint 112 along the peripheral portion 110 allows for efficient electrical coupling between the RFID antenna 102 and the ground plane 104 while minimizing interferencewith the RFID antenna's 102 radiation pattern. The peripheral positioning may also contribute to the overall structural integrity of the RFID device 100, providing a robust connection that can withstand mechanical stresses during handling and use. Without being bound by any theory, it is believed that the strategic configuration of the electrical connection 108 (also 608 in FIG. 6, for example and other corresponding elements) between the RFID antenna 102 and the ground plane 104, inter alia, plays a pivotal role in achieving the desired electromagnetic performance, particularly antenna tuning and environmental robustness. While an electrical connection inherently links the RFID antenna and ground plane, the specific location of this connection is critical to the subject matter of this invention. In particular, the electrical connection 108 is precisely positioned along a peripheral portion 110 of the dielectric spacer 106. This specific placement is not arbitrary; it is engineered to strategically involve the ground plane 104 in defining the effective electrical loop length of the RFID antenna 102. The RFID antenna is designed to resonate at a predetermined frequency, which is directly dependent on its physical and electrical dimensions. By precisely connecting the RFID antenna 102 to the ground plane 104 at the dielectric spacer's 106 periphery, the ground plane effectively extends and completes the current path of the RFID antenna, thereby establishing a highly specific and desired loop length. This precise loop length inherently tunes the RFID antenna 102 to its exact operational frequency. Deviations from this precise peripheral connection position would alter the antenna's effective loop length, leading to an undesired shift in its resonant frequency and a consequent significant drop in read range and sensitivity, particularly when the RFID device is in challenging electromagnetic environments. This inventive approach allows forfine-tuning the RFID antenna's102 performance by meticulously controlling this critical loop length through the manufacturing process, rather than relying on less precise methods or external tuning components.

[0093] In some embodiments, the peripheral portion 110 comprises an area within 2 mm of an edge 116 of the dielectric spacer 106. This specific dimensional constraint for the peripheral portion 110 is chosen to optimize the performance and manufacturability of the RFID device 100. By limiting the weld joint 112 to this narrow region near the edge 116 of the dielectric spacer 106, the design ensures that the electrical connection 108 between the RFID antenna 102 and the ground plane 104 is established, in a manner that precisely controls the antenna's effective loop length for tuning, without interfering with the critical central areas of the RFID antenna 102 where current distribution is most important for radiation efficiency. This specific and narrow peripheral region 110 may allow for sufficient area to create a robust electrical connection 108 while minimizing the impact on the overall form factor of the RFID device 100. This narrow peripheral region may also facilitate easier manufacturing processes, as welding equipment can access this area without risking damage to other components.

[0094] In some embodiments, the weld joint 112 may include a series of spot welds 114, strategically placed to ensure a robust and reliable connection between the RFID antenna 102 and the ground plane 104. This configuration provides the necessary electrical continuity and also contributes to the mechanical stability of the RFID device 100. The precise design and placement of the electrical connection 108, via the series of spot welds 114, may be tailored to achieve specific performance characteristics, such as bandwidth, resonant frequency, and radiation efficiency. Furthermore, the precise placement of these spot welds contributes to defining the effective loop length of the RFID antenna, thereby precisely tuning it to itspredetermined frequency. Additionally, the electrical connection 108 may help in mitigating the effects of environmental factors, such as proximity to high dielectric constant materials, by allowing the RFID antenna 102 and ground plane 104 to work together more effectively as an integrated system.

[0095] The weld joint 112 may be formed using various welding techniques, such as laser welding, ultrasonic welding, inductive welding, or capacitive welding, depending on the specific materials and design requirements of the RFID device 100. In some cases, the weld joint 112 may include the series of spot welds 114 distributed along the peripheral portion 110, which may provide multiple points of electrical contact while allowing for some flexibility in the structure of the RFID device 100. This configuration may help accommodate thermal expansion and contraction, as well as minor mechanical stresses, without compromising the electrical connection 108. The precise spacing and size of the spot welds 114 may be optimized to balance electrical performance with manufacturing efficiency. In some embodiments, each spot weld 114 includes a diameter in a range of 0.1 mm to 2 mm. Additionally, the weld joint 112 may be designed to have a low profile, ensuring that it does not significantly alter the overall thickness of the RFID device 100 or interfere with the RFID antenna's 102 radiation pattern.

[0096] In some embodiments, the RFID device 100 includes an adhesive layer between the RFID antenna 102, the dielectric spacer 106, and the ground plane 104. This adhesive layer serves multiple purposes within the RFID device 100. Firstly, the adhesive layer securely bonds the various components together, ensuring the structural integrity of the RFID device 100 during handling and use. Secondly, the adhesive layer may contribute to the overall dielectric properties of the dielectric spacer 106 region, potentially enhancing the performanceof the RFID antenna 102 by fine-tuning the electromagnetic characteristics of the RFID device 100. The adhesive layer may be effectively selected to have dielectric properties that complement those of the dielectric spacer 106, which has a dielectric constant in a range of 1 to 6, or preferably 1-5 or more preferably 1-4.

[0097] In some embodiments, the thickness of the adhesive layer may be in a range of 10 micrometers to 100 micrometers. This specific thickness range allows for effective bonding while minimizing the overall thickness of the RFID device 100. Additionally, the RFID device 100 may include a release liner over the ground plane 104. This release liner serves as a protective covering for the adhesive layer, preventing premature adhesion and contamination before the RFID device 100 is deployed.

[0098] In some embodiments, the RFID device 100 also includes a release liner over the ground plane 104. This release liner serves as a protective covering for the adhesive layer, shielding it from contamination and preventing premature adhesion before the RFID device 100 is deployed. The release liner may be composed of materials such as silicone-coated paper or plastic film, which are specifically designed to separate easily from the adhesive when the RFID device 100 is ready for application. This feature allows for convenient storage and handling of the RFID device 100 prior to its final installation, while also preserving the adhesive properties for optimal bonding when needed.

[0099] In some embodiments, the release liner may include a release force in a range of 10 grams per inch to 200 grams per inch, or more preferably in the range of 10 grams per inch to 100 grams per inch. This specific range of release force is carefully selected to balance ease of removal with secure protection during storage and transport. A release force within this rangeensures that the liner can be peeled away smoothly without damaging the underlying adhesive or the delicate components of the RFID device 100, such as the RFID antenna 102 or the ground plane 104. The lower end of the range (10 grams per inch) may be suitable for applications requiring effortless removal, while the higher end (200 grams per inch) may be preferred for more demanding environments where accidental separation needs to be prevented. This range of release force also complements the dielectric properties of the dielectric spacer 106, which has a dielectric constant in a range of 1 to 4.(00100] In accordance with the present subject matter, the RFID device 100 described presents a unique and efficient design for radio frequency identification tags that can operate effectively in challenging environments, particularly when applied to items containing high dielectric constant materials or metallic surfaces. This unique structural arrangement and efficient design prevent substantial frequency shifts and / or sensitivity drops or other or other adverse impacts when the RFID device 100 is applied to items containing high dielectric constant materials and / or is applied to a metal container or surface. The strategic spatial arrangement of its RFID antenna 102, dielectric spacer 106, and ground plane 104, including the precise electrical connection between the RFID antenna 102 and the ground plane 104, selectively positioned to achieve a desired loop length of the RFID antenna 102, thereby accurately tuning it to its predetermined frequency to achieve stable operational frequency. This targeted tuning is believed to be one of the major drivers for the device's robust performance. For high dielectric constant materials, this tuning prevents substantial frequency shifts and sensitivity drops by mitigating the capacitive loading effect. For metallic surfaces, the ground plane 104, by effectively becoming part of the RFID antenna's 102 resonant structure through the preciselytuned loop length, simultaneously shields the RFID antenna 102 from signal absorption and distortion caused by the metal, ensuring reliable communication by maintaining the antenna's intended radiation characteristics. The dielectric spacer 106 is believed to be crucial in enabling both the precise loop length definition and the effective shielding function of the ground plane. This synergistic action of precise tuning and effective shielding ensures robust operation even when the RFID device is applied to items presenting a combined challenge, such as metallic containers filled with high-dielectric liquids. The unique design of the RFID device 100, characterized by the precise spatial arrangement of its RFID antenna 102, dielectric spacer 108, ground plane 104, and electrical connection 112, enables what is termed as "Enhanced Readability Performance" in challenging environments. This enhancement is particularly critical when the RFID device is applied to metallic items, placed near other electromagnetically reflective surfaces, or utilized with items comprising high dielectric constant materials (such as liquids or protein-rich products). In such scenarios, conventional RFID tags typically experience significant detuning, frequency shifts, signal attenuation, or complete loss of readability. The present invention's strategic design, leveraging the precise control over the RFID antenna's 102 effective loop length and the ground plane's 104 shielding, ensures that the RFID antenna's 102 electrical properties are maintained or optimized, providing a level of performance (e.g., read range, frequency stability, sensitivity) that represents a substantial improvement over the expected degradation in these adverse conditions or an advancement beyond prior art solutions. This comprehensive approach ensures the device operates reliably across a spectrum of difficult electromagnetic interferences. In some embodiments, the RFID device 100 is specifically configured for enhanced readability performance when applied to or in proximity to metallicitems. As illustrated conceptually by the RFID device 100 in FIGs. 1A-C (and corresponding device and elements in FIG. 6), such a device comprises an RFID antenna 102 a ground plane 104, a dielectric spacer 106 positioned between them, and an electrical connection 108. For metallic item applications, the ground plane 104 is critically configured to shield the RFID antenna 102 from electromagnetic interference caused by the metallic item, thereby mitigating signal absorption, detuning, and pattern distortion typically associated with metal proximity. Concurrently, the electrical connection 108 is strategically positioned and configured to tune the RFID antenna 102 to its operational frequency by influencing its effective loop length, ensuring stable resonant characteristics even when the antenna is operating in the near-field of the metallic surface. This synergistic action of shielding by the ground plane and precise tuning via loop length enables robust RF readability for metallic tagging applications.

[0101] In other embodiments, the RFID device 100 is specifically configured for enhanced readability performance when applied to or in proximity to a high-dielectric content item. As shown in FIGs. 1A-C and FIG. 6, this device also includes an RFID antenna 102, a ground plane 104, a dielectric spacer 106, and an electrical connection 108. For high-dielectric content item applications, the dielectric spacer 106 is critically designed with a specific thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna 102 by counteracting the capacitive loading and detuning effects inherent to such materials. Simultaneously, the electrical connection 108 is positioned and configured to tune the RFID antenna 102 to its operational frequency by influencing its effective loop length, ensuring efficient power transfer and reliable communication even when the RFID device is surroundedby high-dielectric media. This dual approach of dielectric-based stability and precise loop-length tuning guarantees effective RF readability for high-dielectric tagging applications.

[0102] FIG. 2 is an illustration of a system 200 for manufacturing of the RFID device 100, in accordance with an embodiment. In some embodiments, the system 200 may include a first supply mechanism 202, a second supply mechanism 204, and a third supply mechanism 206. In some embodiments, the system 200 may also include a connection mechanism 208. In some embodiments, the connection mechanism 208 may include a welding device 210.

[0103] In some embodiments, the first supply mechanism 202 is configured to provide the RFID antenna 102 configured to operate at a predetermined frequency. The first supply mechanism 202 may comprise a reel or roll containing a continuous web of RFID antenna 102, including the strap 118 and the RFID chip 120, allowing for efficient and automated feeding of antennas into the manufacturing process. The RFID antenna 102 provided by the first supply mechanism 202 is specifically designed and tuned to operate at a predetermined frequency, which may be within the ultra-high frequency (UHF) range typically used for RFID applications, such as between 860 MHz and 960 MHz.

[0104] In some embodiments, the second supply mechanism 204 is configured to provide the dielectric spacer 106 over the RFID antenna 102. The second supply mechanism 204 may be designed to accurately dispense and position the dielectric spacer 106 onto the RFID antenna 102 as part of the continuous manufacturing process. The dielectric spacer 106 plays a crucial role in maintaining the predetermined frequency and sensitivity of the RFID antenna 102 when the RFID device 100 is in proximity to items containing high dielectric constant materials.

[0105] The second supply mechanism may utilize various methods to provide the dielectric spacer 106, such as roll-to-roll dispensing, sheet feeding, or even in-situ formation techniques. The mechanism may be equipped with precision control systems to ensure accurate placement and consistent thickness of the dielectric spacer 106 across the RFID antenna 102. This precision is believed to be essential as the thickness of the dielectric spacer 106, directly impacts the performance of the RFID device 100. In various embodiments, the thickness of the dielectric spacer may range from approximately 0.2 mm to 1.5 mm to accommodate different application requirements and substrate characteristics. In certain preferred embodiments, a more specific thickness range of approximately 0.01 mm to 0.2 mm is employed to achieve optimal electromagnetic performance while maintaining minimal form factor. The supply mechanism may also incorporate features to handle different dielectric materials with varying dielectric constants, typically in the range of 1 to 6, or preferably in the range of 1- 5 or more preferably in the range of 2 to 5, allowing for flexibility in manufacturing RFID devices tailored for specific applications or environments.

[0106] In some embodiments, the third supply mechanism is configured to provide a ground plane 104 over the dielectric spacer 106. This supply mechanism may be designed to accurately dispense and position the ground plane 104 as the final conductive layer in the RFID device 100 assembly process. The ground plane 104 serves a critical function in shielding the RFID antenna 102 from electromagnetically reflective surfaces, thereby ensuring enhanced performance by preventing unwanted reflections.

[0107] The third supply mechanism may employ various methods to provide the ground plane 104, such as roll-to-roll feeding of a conductive foil or film, vapor deposition, orprinting of conductive materials. The mechanism may incorporate precision control systems to ensure accurate placement and uniform coverage of the ground plane 104 over the dielectric spacer 106. This precision is crucial as the positioning and continuity of the ground plane 104 directly impact the shielding effectiveness and overall performance of the RFID device 100.

[0108] In some embodiments, the system 200 may include a web transport mechanism 212 configured to continuously move at least one of the RFID antennas 102, the dielectric spacer 106, or the ground plane 104 during the manufacturing process. This web transport mechanism 212 plays a crucial role in enabling continuous, high-volume production of RFID devices 100 by facilitating the seamless flow of materials through various stages of the manufacturing process.

[0109] In some embodiments, the web transport mechanism 212 may consist of a series of rollers, belts, or conveyor systems designed to handle delicate electronic components with precision. The web transport mechanism 212 may be equipped with advanced tension control systems to maintain consistent tension across the web, preventing wrinkles, stretching, or misalignment of the materials as they move through the production line. In some embodiments, the web transport mechanism 212 may also incorporate registration systems using optical sensors or mechanical guides to ensure proper alignment of the antenna 102, dielectric spacer 106, and ground plane 104 layers as brought together. Additionally, the web transport mechanism 212 may be equipped with advanced monitoring systems that track web tension, speed, and alignment in real-time, allowing for immediate adjustments to maintain optimal production conditions.

[0110] In some embodiments, the system 200 is configured to produce an arrangement of the RFID antenna 102, the dielectric spacer 106, and the ground plane 104 that enables stable operational frequency and enhanced performance when the RFID device 100 is in proximity to items containing high dielectric constant materials or metallic surfaces. . This configuration is achieved such that at least the thickness of the dielectric spacer 106 and dielectric constant maintain the predetermined frequency and sensitivity of the RFID antenna 102 when the RFID device 100 is in proximity to items containing high dielectric constant materials, and the ground plane 104 shields the RFID antenna 102 from electromagnetically reflective surfaces to ensure enhanced performance by preventing unwanted reflections. Crucially, the connection mechanism 208 is configured to form the electrical connection 108 at a precise location to achieve a desired loop length for the RFID antenna 102, thereby tuning it to its predetermined frequency for desired readability performance. This overall configuration may be achieved through precise control and coordination of the first, second, and third supply mechanisms (202, 204, 206) along with the connection mechanism 208.

[0111] Similarly, a system for manufacturing such RFID devices (e.g., system 200 in FIG. 2) is configured to produce these specific environmental adaptations. For devices intended for metallic items, the system's third supply mechanism (for the ground plane) is configured to provide a ground plane 104 that actively shields the RFID antenna 102 from metallic interference. For devices intended for high-dielectric content items, the system's second supply mechanism for the dielectric spacer is configured to provide a dielectric spacer 106 with properties (thickness and dielectric constant) that maintain the RFID antenna's 102 stable operational frequency in high-dielectric environments. In both cases, the system's connection mechanism 208 is preciselyconfigured to form the electrical connection 108 in a manner that tunes the RFID antenna 102 to its operational frequency by influencing its effective loop length, thereby ensuring the manufactured devices achieve the desired environmental readability.

[0112] In some embodiments, the system 200 may include a tension control system configured to maintain consistent tension across the RFID antenna 102, the dielectric spacer 106, and the ground plane 104 during the manufacturing process. This tension control system may play a crucial role in ensuring the quality and consistency of the RFID devices 100 produced. The tension control system may incorporate a series of rollers, sensors, and actuators distributed along the manufacturing line. These components work in concert to monitor and adjust the tension of the materials as they move through various stages of production. Tension sensors may continuously measure the force applied to the RFID antenna 102, dielectric spacer 106, and ground plane 104 materials, providing real-time data to a central control unit. Based on this feedback, the control unit may dynamically adjust the speed and torque of feed and take-up rollers to maintain optimal tension levels. This precise control may help prevent issues such as wrinkling, stretching, or misalignment of the materials, which could otherwise compromise the performance or reliability of the finished RFID devices 100.

[0113] The system 200 may incorporate advanced sensing and feedback mechanisms to monitor and adjust the thickness of the dielectric spacer 106 in real-time during the manufacturing process. This may involve the use of laser measurement systems, capacitive sensors, or other non-contact measurement techniques to ensure that the dielectric spacer 106 maintains a consistent thickness within the specified range (e.g., 0.2 mm to 1.5 mm). In some embodiments, the system may also include mechanisms to verify and control the dielectricconstant of the spacer material, which may involve in-line testing or quality control measures.The arrangement of the RFID antenna 102, dielectric spacer 106, and ground plane 104 may be optimized through computer-controlled positioning systems that ensure precise alignment and spacing between these components.

[0114] In some embodiments, the connection mechanism 208 is configured to form an electrical connection between the antenna 102 and the ground plane 104. This connection mechanism 208 may utilize various techniques to create a robust and reliable electrical connection, ensuring optimal performance of the RFID device 100. The connection mechanism 208 may employ welding techniques, such as resistance welding, ultrasonic welding, or laser welding, to form precise and durable connections at specific points between the antenna 102 and the ground plane 104. These welding processes may be carefully controlled to prevent damage to the delicate antenna structures or the dielectric spacer 106 while still creating a strong electrical bond. In some configurations, the connection mechanism 208 may use conductive adhesives or solder pastes applied at predetermined locations to establish the electrical connection. The connection mechanism 208 may incorporate precision dispensing systems to apply these conductive materials in controlled amounts and patterns. Additionally, the connection mechanism 208 may include heating elements or curing systems to precisely, efficiently and accurately set the electrical connection 108 between the RFID antenna 102 and the ground plane 104.

[0115] In some embodiments, the connection mechanism 208 is configured to create a conductive pathway through non-conductive portions of the dielectric spacer 106 to form the electrical connection. This configuration allows for the establishment of an electrical connectionbetween the RFID antenna 102 and the ground plane 104 while maintaining the integrity and spacing provided by the dielectric spacer 106. The connection mechanism 208 may employ various techniques to achieve this, such as laser drilling, mechanical punching, or chemical etching to create precise openings or channels in the dielectric spacer 106 at predetermined locations.

[0116] Once these openings or channels are created, the connection mechanism 208 may utilize methods such as conductive ink printing, metal deposition, or insertion of conductive elements to establish the conductive pathway through the dielectric spacer 106. The system 200 may incorporate precision alignment and dispensing equipment to ensure accurate placement and formation of these conductive pathways. Additionally, the connection mechanism 208 may include features to verify the continuity and quality of the electrical connection formed through the dielectric spacer 106, such as in-line resistance.

[0117] In some embodiments, the connection mechanism 208 includes a welding device 210 configured to create localized heating at specific points of contact between the RFID antenna 102 and the ground plane 104. This welding device 210 may utilize various techniques to generate precise and controlled heating, enabling the formation of strong electrical and mechanical connections without damaging surrounding components.

[0118] In some embodiments, a system for manufacturing such RFID devices (e.g., system 200 in FIG. 2) is configured to produce these specific environmental adaptations. For devices intended for metallic items, the system's third supply mechanism (for the ground plane) is configured to provide a ground plane 104 that actively shields the RFID antenna 102 from metallic interference. For devices intended for high-dielectric content items, the system's secondsupply mechanism for the dielectric spacer is configured to provide a dielectric spacer 106 with properties (thickness and dielectric constant) that maintain the RFID antenna's 102 stable operational frequency in high-dielectric environments. In both cases, the system's connection mechanism 208 is precisely configured to form the electrical connection 108 in a manner that tunes the RFID antenna 102 to its operational frequency by influencing its effective loop length, thereby ensuring the manufactured devices achieve the desired environmental readability. Such a system may, for example, employ a first supply mechanism providing an RFID antenna 102 made of aluminum, further comprising a strap 118 carrying an RFID chip 120. The third supply mechanism may provide a ground plane 104 of continuous conductive material. The dielectric spacer 106 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 2 to 5. The connection mechanism 208 may utilize a welding device 210 configured to form a weld joint 112 along a peripheral portion 110 of the dielectric spacer 106, said peripheral portion having an area within 2 mm of an edge 116 of the dielectric spacer. This weld joint 112 may comprise a series of spot welds 114, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The system may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0119] An exemplary system for high-dielectric applications may feature a second supply mechanism providing a dielectric spacer 106 with a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 2 to 5. The connection mechanism 208 may utilize capacitive discharge welding with a capacitor bank 400 in the range of 100 pF to 10,000 pF, configured to form a weld joint 112 along a peripheral portion 110 of thedielectric spacer 106. Such a system may, for example, employ a first supply mechanism providing an RFID antenna 102 made of copper, further comprising a strap 118 carrying an RFID chip 120. The third supply mechanism may provide a ground plane 104 of continuous conductive material. The dielectric spacer 106 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 2 to 5. The electrical connection 108 may be a weld joint 112 positioned along a peripheral portion 110 of the dielectric spacer 106, said peripheral portion having an area within 2 mm of an edge 116 of the dielectric spacer. This weld joint 112 may comprise a series of spot welds 114, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The system may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0120] For manufacturing devices for combined challenges, the system may provide RFID antennas 102 made of silver ink, dielectric spacers 106 with a thickness of 0.5 mm (500 micrometers) and a dielectric constant of 3, and ground planes 104 of continuous conductive material. The connection mechanism 208 may include a welding device 210 configured to create spot welds 114 for a weld joint 112 along a peripheral portion 110 of the dielectric spacer 106, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm, ensuring the electrical connection 108 has a pull strength greater than 1 Newton. Such a system may, for example, employ a first supply mechanism providing an RFID antenna 102 made of silver ink, further comprising a strap 118 carrying an RFID chip 120. The third supply mechanism may provide a ground plane 104 of continuous conductive material. The dielectric spacer 106 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in therange of 2 to 5. The electrical connection 108 may be a weld joint 112 positioned along a peripheral portion 110 of the dielectric spacer 106, said peripheral portion having an area within 2 mm of an edge 116 of the dielectric spacer. This weld joint 112 may comprise a series of spot welds 114, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The system may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0121] The welding device 210 may employ methods such as resistance welding, where electrical current is passed through the contact points to generate heat, or laser welding, which uses focused laser energy to create localized melting. In some configurations, the welding device 210 may utilize ultrasonic energy to create friction and heat at the contact points. The welding device 210 may be equipped with precision control systems to regulate the amount of energy applied, the duration of the welding process, and the exact locations of the weld points. This level of control helps ensure consistent weld quality and prevents overheating that could potentially damage the RFID antenna 102, ground plane 104, or dielectric spacer 106. The welding device 210 may also incorporate advanced positioning systems to accurately align the antenna 102 and ground plane 104 at the intended connection points. The welding device 210 may feature multiple welding heads or a movable welding head to create connections at various locations across the RFID device 100.

[0122] In some embodiments, the welding device 210 is configured to create localized heating through the dielectric spacer 106. This configuration allows for the formation of electrical connections between the antenna 102 and the ground plane 104 without compromising the structural integrity of the dielectric spacer 106. The welding device 210 may utilize advancedtechniques to focus energy precisely at the desired connection points, generating heat that can penetrate through the dielectric material to create a conductive pathway. The welding device 210 may be at least one of an inductive heating subsystem, a capacitive discharge heating subsystem, or a laser heating subsystem. Each of these subsystems offers unique advantages for creating localized heating through the dielectric spacer 106.

[0123] In some embodiments, the RFID inlay (e.g., inlay 500 in FIG. 5) is designed to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item. For example, such an inlay may include an RFID antenna 502 made of aluminum, a ground plane 504 comprising a continuous conductive material, and an electrical connection 508 that is a weld joint 512 located along a peripheral portion 510 of the dielectric spacer 506, with a resistance less than 1 ohm. The inlay may operate at a frequency of 915 MHz. Such an inlay may, for example, include an RFID antenna 502 made of aluminum, further comprising a strap 518 carrying an RFID chip 520. The ground plane 504 may be a continuous layer of conductive material. The dielectric spacer 506 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 2 to 5. The electrical connection 508 may be a weld joint 512 positioned along a peripheral portion 510 of the dielectric spacer 506, said peripheral portion having an area within 2 mm of an edge 516 of the dielectric spacer. This weld joint 512 may comprise a series of spot welds 514, each spot weld 514 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The inlay may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0124] An exemplary high-dielectric inlay may feature a dielectric spacer 506 with a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 1 to 5, or preferably 2 to 5. The RFID antenna 502 may be coupled to an RFID chip 520 via a strap 518, and the electrical connection 508 may be a weld joint 512 located along a peripheral portion 510 of the dielectric spacer 506, with a pull strength greater than 1 Newton. Such an inlay may, for example, include an RFID antenna 502 made of copper, further comprising a strap 518 carrying an RFID chip 520. The ground plane 504 may be a continuous layer of conductive material. The dielectric spacer 506 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 1 to 5, more preferably 2 to 5. The electrical connection 508 may be a weld joint 512 positioned along a peripheral portion 510 of the dielectric spacer 506, said peripheral portion having an area within 2 mm of an edge 516 of the dielectric spacer. This weld joint 512 may comprise a series of spot welds 514, each spot weld 514 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The inlay may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0125] Inlays designed for combined challenges, such as for beverage cans, may comprise an RFID antenna 502 made of conductive materials such as silver ink, a dielectric spacer 506 with a thickness of 0.5 mm (500 micrometers) and a dielectric constant of 3, and a ground plane 504 of continuous conductive material. The electrical connection 508 may be a weld joint 512 comprising a series of spot welds 514, each with a diameter in the range of 0.1 mm to 2 mm, located along a peripheral portion 510 of the dielectric spacer 506, ensuring a resistance less than 1 ohm. Such an inlay may, for example, include an RFID antenna 502 made of silver ink, furthercomprising a strap 518 carrying an RFID chip 520. The ground plane 504 may be a continuous layer of conductive material. The dielectric spacer 506 may have a thickness in the range of 200 micrometers to 1500 micrometers and a dielectric constant in the range of 2 to 5. The electrical connection 508 may be a weld joint 512 positioned along a peripheral portion 510 of the dielectric spacer 506, said peripheral portion having an area within 2 mm of an edge 516 of the dielectric spacer. This weld joint 512 may comprise a series of spot welds 514, each spot weld 514 having a diameter in the range of 0.1 mm to 2 mm. This connection may exhibit a resistance less than 1 ohm and a pull strength greater than 1 Newton. The inlay may be configured to operate at a frequency in the range of 860 MHz to 960 MHz.

[0126] In some embodiments, the welding device 210 includes a welding head with a width in a range of 2.5 inches to 5 inches (or approximately 63.5 mm to 127 mm) to accommodate various application scenarios. However, in a preferred configuration where precision and finer weld lines are desired, the welding head width may be more narrowly selected within a range of approximately 0.5 mm to 5 mm. This specific range of welding head widths may provide several advantages in the manufacturing process of RFID devices 100. A welding head within this width range may allow for efficient coverage of the RFID device 100 components during the welding process. It may enable the creation of multiple connection points between the RFID antenna 102 and ground plane 104 in a single pass, potentially increasing production speed. The width may be suitable for accommodating various sizes and configurations of RFID devices 100, providing flexibility in the manufacturing process. In some configurations, the welding device 210 includes a capacitor bank with a capacitance in a range of 100 pF to 10,000 pF. The welding device 210 also includes a control system for adjusting weld parameters based on feedback from previouswelds. This adaptive control system may enhance the precision and consistency of the welding process, potentially improving the overall quality and reliability of the RFID devices 100 produced.

[0127] In some embodiments, the system 200 may include an adhesive applicator 212 configured to apply an adhesive between at least two of the RFID antennas 102, the dielectric spacer 106, and the ground plane 104. This adhesive applicator 212 may play a crucial role in ensuring proper bonding and alignment of the various layers within the RFID device 100.

[0128] The adhesive applicator 212 may utilize precision dispensing technology to apply controlled amounts of adhesive at specific locations. The adhesive applicator 212 may be capable of dispensing various types of adhesives, such as pressure-sensitive adhesives, thermally activated adhesives, or UV-curable adhesives, depending on the requirements of the particular RFID device 100 design. The applicator may feature multiple dispensing nozzles or a programmable single nozzle system that can move across the substrate to apply adhesive in predetermined patterns. In some embodiments, the adhesive applicator is capable of dispensing adhesive at a rate in a range of 0.1 mL / min to 10 mL / min.

[0129] In some embodiments, the system 200 may include a release liner applicator 214 configured to apply a release liner over the ground plane 104. This release liner applicator 214 may serve an important function in protecting the RFID device 100 during manufacturing, storage, and transportation, as well as facilitating easy application of the device to its intended surface. The release liner applicator 214 may be designed to precisely align and apply a thin, removable protective layer over the ground plane 104. This release liner applicator 214 may utilize a combination of rollers, guides, and tension control mechanisms to ensure smooth and wrinkle-free application of the release liner. The system 200 may be capable of handling varioustypes of release liners, such as silicone-coated papers or films, depending on the specific requirements of the RFID device 100 and its intended application. The release liner applicator 214 may be configured to apply the release liner at a speed in a range of 1 m / min to 100 m / min.

[0130] In some embodiments, the system 200 may include a cutting mechanism 216 configured to separate individual RFID devices 100 after formation of the electrical connection. This cutting mechanism 216 may play a crucial role in the final stages of the manufacturing process, enabling the production of discrete RFID devices 100 from a continuous web or sheet of materials.

[0131] The cutting mechanism 216 may employ various technologies depending on the specific requirements of the RFID device 100 design and production volume. It may utilize methods such as die-cutting, laser cutting, or ultrasonic cutting to achieve precise and clean separation of individual devices. The mechanism may be designed to handle the multi-layer structure of the RFID devices 100, including the RFID antenna 102, dielectric spacer 106, and ground plane 104, without damaging the delicate components or compromising the electrical connections.

[0132] FIG. 3 is an illustration of an inductive heating subsystem 300 for inductive welding of the RFID device 100, in accordance with an embodiment. In some embodiments, the inductive heating subsystem 300 is configured to induce eddy currents at an interface between the antenna and the ground plane to form the electrical connection.

[0133] The welding may involve inductive heating, as illustrated in Fig. 3, where current is passed through an electrically conductive member such as a copper coil 410. In some embodiments, a copper coil 310 is placed in the vicinity of the web of substrate carrying the RFIDantenna 102, the dielectric member 106 and the ground plane 104. Nip rollers 320 may be used to ensure proper lamination of the antenna 102 and the dielectric member 106 with the second ground plane 104. The passage of current through the copper coil 310 induces eddy currents in the contacting portions of the RFID antenna 102 and the ground plane 104 of the RFID device 100. In some embodiments, as shown in Fig. 3, the passage of current through the copper coil 310 is controlled by an inductive heater control unit (not shown) based on inputs received from an inductive proximity sensor (not shown). The inductive proximity sensor is configured to detect the presence of contacting portions of the RFID antenna 102 and contacting portions of the ground plane 104. In some embodiments, an inductive proximity sensor is positioned in a stage that occurs after the attachment of the ground plane 104 to the dielectric member 106. In an exemplary embodiment, the movement of web 301 carrying the RFID antenna 102 and the ground plane 104 is not halted to complete the required heating. The passage of current through the copper coil 310 facilitates the formation of mechanical or direct physical and electrically conductive connection between the RFID antenna 102 and the ground plane 104 of the RFID device 100. This connection can also be described as a galvanic connection. Once the welding is complete, the web of substrate carrying the RFID antenna 102 and the ground plane 104, with the dielectric member 106 sandwiched between the RFID antenna 102 and the ground plane 104, moves to the next stage of production.

[0134] FIG. 4 is an illustration of a capacitive heating subsystem 400 for capacitive welding of the RFID device 100, in accordance with an embodiment. In some embodiments, the capacitive discharge heating subsystem 400 includes a bank of capacitors configured to store electrical energy. In some examples, the capacitive discharge heating subsystem 400 includes acapacitor bank with a capacitance in a range of 100 pF to 10,000 100 pF, more preferably in the range of 600 pF to 1500 pF.

[0135] In some embodiments, welding may also be performed as illustrated in Fig. 4. The welding is performed by passing a high current through the extension portion of the RFID antenna 102 and corresponding contact portions of the ground plane 104 of the RFID device 100 with the aid of a device 401 such as a capacitive discharge welder including a welding wheel. The exemplary device 401 is configured to create a spot weld to mechanically and electrically connect contact portions of the RFID antenna 102 with the contact portions of the ground plane 104 of the RFID device 100. In some embodiments, the capacitive discharge heating subsystem 400 includes a control unit configured to release the stored electrical energy in a series of timed pulses to form the electrical connection.

[0136] In some embodiments, a release liner 323 from a reel 312 is unwound and secured to the top surface of the ground plane 104 using an adhesive applicator once the welding is completed to finished roll 325. It should be understood that the post-welding processing steps described above are merely exemplary and that other and / or additional processing steps may be employed without departing from the scope of the present disclosure.

[0137] FIG. 5 is an illustration of an RFID inlay 500, in accordance with an embodiment. It may be appreciated that the RFID inlay 500 is similar to the RFID device 100, and the components are also similar in construction and function. In some embodiments, the RFID inlay 500 includes a substrate 501 including an RFID antenna 502. In some embodiments, the RFID inlay 500 includes a ground plane 504 and a dielectric spacer 506 attached to the RFID antenna 502, and positioned between the RFID antenna 502 and a ground plane 504.Furthermore, the ground plane 504 is attached to the dielectric spacer 506 and positioned adjacent to a surface of the dielectric spacer 506 remote from the RFID antenna 502. The RFID antenna 502 is coupled to an RFID chip 520. The dielectric spacer 506 includes at least a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the RFID antenna 502 when the RFID inlay 500 is applied to items containing high dielectric constant materials, and the ground plane 504 is configured to shield the RFID antenna 502 from electromagnetically reflective surfaces to ensure enhanced performance by preventing unwanted reflections. In some exemplary embodiment, an electrical connection between the RFID antenna 502 and the ground plane 504 is positioned and configured to achieve a desired loop length of the RFID antenna 502, thereby tuning the RFID antenna 502 to its operational frequency in a manner that mitigates frequency shifts caused by high dielectric constant materials and optimizes antenna impedance and radiation characteristics on metallic or electromagnetically reflective surfaces, enabling its robust performance. It is believed that the ground plane 504 contributes to the resonant behavior of the RFID antenna 502 by effectively becoming part of its resonant structure through the precisely defined loop length. This combined configuration of the dielectric spacer and ground plane specifically enables the RFID inlay 500 to perform robustly even when applied to items presenting a combined challenge, such as metallic containers filled with high-dielectric liquids.

[0138] In some embodiments, the ground plane 504 is physically and electrically 508 connected to the antenna 502 through a weld joint 512. In various embodiments, the weld joint 512 is positioned and configured to achieve a desired loop length of the RFID antenna 502, thereby tuning the RFID antenna 502 to its operational frequency and enabling enhancedperformance. In some embodiments, the weld joint 512 is located along a peripheral portion 510 of the antenna 502 and the ground plane 504. In some embodiments, the weld joint 512 includes a series of spot welds 514. In some embodiments, the RFID antenna 502 includes a strap 518 carrying the RFID chip 520.

[0139] Furthermore, the specific design principles are embodied in the RFID inlay (e.g., RFID inlay 500 in FIG. 5). For inlays configured for metallic item applications, the ground plane 504 is specifically attached and configured to shield the RFID antenna 502 from electromagnetic interference caused by the metallic item. For inlays configured for high- dielectric content item applications, the dielectric spacer 506 (with its specific thickness and dielectric constant) is designed to maintain the RFID antenna's 502 stable operational frequency in proximity to such materials. In all these inlay embodiments, the electrical connection 508 between the RFID antenna 502 and the ground plane 504 is precisely positioned and configured to tune the RFID antenna 502 to its operational frequency by influencing its effective loop length, ensuring optimal readability across various challenging surfaces.

[0140] FIG. 6 is an illustration of an RFID device 600, in accordance with an embodiment. It may be appreciated that the RFID device 600 is similar to the RFID device 100, and the components are also similar in construction and function.

[0141] In some embodiments, the RFID device 600 may be configured to maintain stable resonant frequency and effective performance when positioned adjacent to materials or items 601 including a high dielectric constant or electromagnetically reflective surfaces. In some embodiments, the RFID device 600 may be configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item or a high-dielectric content item601. Furthermore, the effective RF readability includes maintaining a read range of at least 10 to20 meters or higher when applied to the metallic item or the high-dielectric content item 601. Additionally, the high-dielectric content item 601 includes liquids, food products, or biological materials.

[0142] In some embodiments, the RFID device 600 includes an RFID antenna 602 may be configured to operate at a predetermined frequency. In some embodiments, the RFID device 600 includes a ground plane 604. In some embodiments, the ground plane 604 is configured to divert unwanted eddy currents or electromagnetic standing waves originating from nearby reflective surfaces. In some examples, the ground plane 604 is also configured to shield the RFID antenna 602 from electromagnetic interference caused by metallic items or other electromagnetically reflective surfaces 601.

[0143] In some embodiments, the RFID device 600 includes a dielectric spacer 606 disposed between the RFID antenna 602 and the ground plane 604. Furthermore, the dielectric spacer 606 includes at least a thickness and dielectric constant configured to reduce frequency shift and maintain sensitivity of the RFID antenna 602 when the RFID device 600 is in proximity to high dielectric constant materials or items 601. Moreover, the dielectric spacer's 606 thickness is specifically tuned to minimize capacitive loading on the RFID antenna 602 when adjacent to high dielectric constant materials or items 601. In some embodiments, the dielectric spacer 606 has a thickness and dielectric constant configured to maintain a stable operational frequency of the antenna when the RFID device is in proximity to the high-dielectric content item.

[0144] In some embodiments, the RFID device 600 includes an electrical connection 608 between the RFID antenna 602 and the ground plane 604. In some embodiments, theelectrical connection 608 is configured to tune the antenna 602 to its operational frequency. In some embodiments, the electrical connection 608 is being positioned and configured to achieve a desired loop length of the RFID antenna 602, thereby tuning the antenna 602 to the predetermined frequency and enhancing its electrical properties for a desired readability performance. In some embodiments, the electrical connection 608 provides a controlled impedance path between the RFID antenna 602 and the ground plane 604. In some embodiments, the electrical connection 608 is configured to tune the antenna 602 to its operational frequency by influencing its effective loop length. In some embodiments, the electrical connection 608, the dielectric spacer 606, and the ground plane 604 are arranged to optimize impedance matching for the RFID antenna 602 in the presence of the metallic item or the high-dielectric content item 601.

[0145] In some embodiments, the electrical connection 608 includes a weld 612 located along a peripheral portion 610 of the RFID antenna 602 and the ground plane 604, being configured to establish a desired loop length for tuning the antenna. In some embodiments, electrical connection 608 includes the weld 612 positioned along a peripheral edge of the dielectric spacer 606. Furthermore, the positioning of the weld 612 being configured to co-act with the ground plane to complete and tune the effective loop length of the antenna to the predetermined frequency and impedance matching.

[0146] In some embodiments, the weld 612 includes one or more individual connection points 614 distributed along the peripheral portion 610. In some embodiments, each individual connection point 614 has a bonding dimension in a range of 0.1 mm to 2 mm. In some embodiments, the antenna 602 includes a strap 618 carrying the RFID chip 620.

[0147] FIG. 7 is an illustration of a flow chart of a method 700 of manufacturing a radio frequency identification (RFID) device, in accordance with an embodiment.

[0148] At step 702, an RFID antenna 102 configured to operate at a predetermined frequency is provided. In some embodiments, the RFID antenna 102 may be designed to efficiently transmit and receive radio frequency signals within a specific frequency range, optimized for the intended application of the RFID device 100. The RFID antenna 102 may be fabricated using various conductive materials such as copper, aluminum, or silver, selected based on factors including conductivity, cost, and ease of manufacturing. It may be formed through processes such as etching, printing, or stamping, allowing for precise control over its shape and dimensions. The specific geometry of the RFID antenna 102 may be carefully engineered to resonate at the predetermined frequency, considering factors such as the dielectric properties of surrounding materials and the intended operating environment. In some configurations, the RFID antenna 102 may incorporate multiple elements or a fractal design to achieve multi-band operation or to miniaturize its overall size while maintaining performance at the predetermined frequency.

[0149] At step 704, a dielectric spacer under the RFID antenna 102 is positioned. The dielectric spacer 106 may serve several functions in the RFID device 100 design and performance. The dielectric spacer 106 may be composed of materials with specific dielectric properties, such as polyethylene, polytetrafluoroethylene (PTFE), or ceramic-filled composites. The choice of material may be based on factors including the desired frequency response, environmental resistance, and manufacturing considerations. The thickness and dielectric constant of the spacer 108 may be carefully selected to optimize the RFID antenna 102 performance and achieve thedesired operating frequency. Positioning the dielectric spacer 106 under the RFID antenna 102 may help to isolate the antenna from the ground plane 104 or other conductive surfaces, potentially improving the radiation efficiency and read range of the RFID device 100. The spacer 108 may also contribute to impedance matching between the RFID antenna 102 and the RFID chip 120, enhancing power transfer and overall system performance.

[0150] At step 706, a ground plane 104 over the dielectric spacer 106 is provided. The ground plane 104 may be composed of a conductive material, such as copper, aluminum, or a metalized polymer film. It may be applied through various methods, including lamination, vapor deposition, or printing, depending on the specific requirements of the manufacturing process and desired performance characteristics. The ground plane 104 may also contribute to the mechanical stability and environmental protection of the RFID device 100.

[0151] At step 708, an electrical connection 108 between the RFID antenna 102 and the ground plane 104 is formed. The electrical connection 108 may be created using various techniques, such as welding, soldering, conductive adhesives, or mechanical fastening. The method chosen may depend on factors including the materials used for the RFID antenna 102 and ground plane 104, the desired electrical characteristics, and manufacturing considerations.

[0152] The electrical connection 108 may also serve to mechanically anchor the RFID antenna 102 to the ground plane 104, potentially improving the durability and reliability of the RFID device 100. In some cases, the electrical connection 108 may be designed to be flexible or stress-relieving to accommodate thermal expansion or mechanical flexing of the device.

[0153] The steps 702 to 708 are only illustrative and other alternatives can also be provided where one or more steps are added, one or more steps are removed, or one or more steps are provided in a different sequence without departing from the scope of the claims herein.

[0154] In some embodiments, the method 700 also is configured to form an arrangement of the RFID antenna 102, the dielectric spacer 106, and the ground plane 104 such that a thickness of the dielectric spacer 106 and dielectric constant maintain the predetermined frequency and sensitivity of the RFID antenna 102. In some embodiments, when the RFID device 100 is in proximity to items containing high dielectric constant materials, and the ground plane 104 shields the RFID antenna 102 from electromagnetically reflective surfaces and high radiation absorbing surfaces to ensure enhanced performance by preventing unwanted reflections.

[0155] In some embodiments, the method 700 also includes forming the electrical connection 108 includes welding the RFID antenna 102 to the ground plane 104. In some embodiments, the welding is performed along a peripheral portion 110 of the RFID antenna 102 to the ground plane 104. In some embodiments, the peripheral portion includes an area within 2 mm of an edge of the dielectric spacer. In some embodiments, the welding includes capacitive discharge welding. In some embodiments, the capacitive discharge welding typically uses a welding device operating at a voltage in a range of 0 to 12V i.e. up to 12V or equivalent depending on the application needs. In some embodiments, the capacitive discharge welding uses a welding device operating at a discharge time in a range of 20 microseconds to 10 milliseconds. In some embodiments, the welding comprises creating spot welds between the RFID antenna 102 and the ground plane 104.

[0156] In some embodiments, the method 700 also includes applying an adhesive between at least of the RFID antenna 102, the dielectric spacer 106, and the ground plane 104. In some embodiments, the adhesive includes a thickness in a range of 5 micrometers to 100 micrometers, or more preferably in the range of 10 micrometer to 100 micrometer. In some embodiments, the method 700 also includes applying a release liner over the ground plane. Said weld joint 512 is positioned and configured to achieve a desired loop length of the RFID antenna 502, thereby tuning the RFID antenna 502 to its operational frequency and enabling enhanced performance. In some embodiments, forming the electrical connection 108 comprises using a non-contact welding technique. Furthermore, the non-contact welding technique is configured to minimize mechanical stress on the dielectric spacer 106.

[0157] FIG. 8 is an illustration of a flow chart of a method 800 for manufacturing a radio frequency identification (RFID) device configured for stable resonant frequency and enhanced performance in high dielectric or reflective environments, in accordance with an embodiment.

[0158] In some embodiments, the method of manufacturing (e.g., methods 700, 800, 900 in FIG. 7-9) also encompasses steps specifically tailored for these environmental adaptations. For devices intended for metallic items, the method may include providing an RFID antenna 102 formed from aluminum, positioning a dielectric spacer 106 with a thickness of 0.5 mm (500 micrometers) between the RFID antenna 102 and the ground plane 104, and forming the electrical connection 108 via a weld joint 112 using non-contact welding along a peripheral portion 110 of the dielectric spacer 106. For devices intended for high-dielectric content items, the method may involve providing an RFID antenna 102 made of copper, positioning a dielectricspacer 106 with a dielectric constant in the range of 2 to 5 between the RFID antenna 102 and the ground plane 104, and forming the electrical connection 108 via a weld joint 112 using capacitive discharge welding with a voltage in the range of 100V to 5000V along a peripheral portion 110 of the dielectric spacer 106. For manufacturing devices for combined challenges, the method may include providing an RFID antenna 102 made of silver ink, positioning a dielectric spacer 106 with a thickness of 0.5 mm (500 micrometers) and a dielectric constant of 1-6 or 2-5 between the RFID antenna 102 and the ground plane 104, and forming the electrical connection 108 through spot welds 114 for a weld joint 112 along a peripheral portion 110 of the dielectric spacer 106, each spot weld 114 having a diameter in the range of 0.1 mm to 2 mm, ensuring a pull strength greater than 1 Newton. This method may further include processing materials on a continuously moving web, and applying an adhesive 212 with a thickness in the range of 10 micrometers to 100 micrometers, and applying a release liner 214 with a release force in the range of 10 grams per inch to 200 grams per inch or in some embodiment it is 10 grams per inch to 100 grams per inch.

[0159] At step 802, providing an RFID antenna configured to operate at a predetermined frequency.

[0160] At step 804, a dielectric member over the antenna is positioned. This positioning of the dielectric member is a critical step in establishing the precise spatial arrangement of the RFID device, an arrangement fundamental to enabling the targeted loop length tuning of the RFID antenna for robust performance in various challenging electromagnetic environments, including those affected by high dielectric constant materials and metallicsurfaces. The dielectric spacer's properties are particularly selected to mitigate frequency detuning when the RFID device is in proximity to high dielectric constant materials.

[0161] At step 806, a ground plane over the dielectric member is provided. The ground plane is configured to attenuate interference from electromagnetically reflective surfaces; and

[0162] At step 808, forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to achieve a desired loop length of the antenna by connecting it to the ground plane, thereby tuning the antenna to the predetermined frequency and enabling its desired readability.

[0163] The steps 802 to 808 are only illustrative, and other alternatives can also be provided where one or more steps are added, one or more steps are removed, or one or more steps are provided in a different sequence without departing from the scope of the claims herein.

[0164] FIG. 9 is an illustration of a flow chart of a method 900 for manufacturing a radio frequency identification (RFID) device, in accordance with an embodiment.

[0165] At step 902, a dielectric member over an RFID antenna is positioned. The dielectric spacer includes a set of selected properties such as thickness and dielectric constant to establish a desired separation from high dielectric constant materials.

[0166] At step 904, a ground plane over the dielectric spacer is provided. The ground plane being configured to create a reflective shield for the antenna.

[0167] At step 906, the antenna is electrically connected to the ground plane at a precise location to achieve a desired loop length for the RFID antenna, thereby tuning it to itsoperational frequency and enabling stable operational frequency and enhanced performance when exposed to high dielectric constant materials or electromagnetically reflective surfaces.

[0168] The method of manufacturing (e.g., methods 700, 800, 900 in FIG. 7-9) also encompasses steps specifically tailored for these environmental adaptations. For devices intended for metallic items, the method includes steps for providing a ground plane 104 configured to shield the RFID antenna 102 from metallic interference. For devices intended for high-dielectric content items, the method includes steps for positioning a dielectric spacer 106 with properties (thickness and dielectric constant) configured to maintain the RFID antenna's 102 stable operational frequency in high-dielectric environments. In both scenarios, the method includes the critical step of forming the electrical connection 108 between the RFID antenna 102 and the ground plane 104, which is performed to tune the RFID antenna 102 to its operational frequency by influencing its effective loop length, thereby guaranteeing robust performance in the target environment.

[0169] The steps 902 to 906 are only illustrative and other alternatives can also be provided where one or more steps are added, one or more steps are removed, or one or more steps are provided in a different sequence without departing from the scope of the claims herein.

[0170] In some embodiments, the method also includes forming the electrical connection comprises welding the RFID antenna to the ground plane, the welding being configured to achieve the desired loop length of the antenna for tuning to the predetermined frequency.

[0171] In some embodiments, the welding is performed along a peripheral portion of the dielectric member to co-act with the ground plane in establishing the desired loop length fortuning the RFID antenna. In some embodiments, the welding includes capacitive discharge welding. In some embodiments, the capacitive discharge welding uses a welding device operating at a voltage in a range of 100V to 5000V.

[0172] In some embodiments, the capacitive discharge welding uses a welding device operating at a discharge time in a range of 1 microsecond to 1 millisecond. In some embodiments, the welding includes creating spot welds between the antenna and the ground plane. In some embodiments, each spot weld has a diameter in a range of 0.1 mm to 2 mm.

[0173] In some embodiments, the method also includes applying an adhesive between at least two of the RFID antennas, the dielectric member, and the ground plane. In some embodiments, the adhesive has a thickness in a range of 10 micrometers to 100 micrometers. In some embodiments, forming the electrical connection includes using a non-contact welding technique. In some embodiments, the non-contact welding technique is configured to minimize mechanical stress on the dielectric member. In some embodiments, the method also includes processing at least one of the antenna, the dielectric member, or the ground plane on a continuously moving web.

[0174] What has been described above includes examples of the claimed subject matter. It may be, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the claimed subject matter, but one of ordinary skill in the art may recognize that many further combinations and permutations of the claimed subject matter are possible. Accordingly, the claimed subject matter may be intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either thedetailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim.

Claims

CLAIMSWhat is claimed is:

1. A radio frequency identification (RFID) device, comprising: an RFID antenna configured to operate at a predetermined frequency; a ground plane; a dielectric spacer positioned between the RFID antenna and the ground plane, the dielectric spacer including at least a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the RFID antenna when the RFID device is in proximity to items containing high dielectric constant; and an electrical connection between the RFID antenna and the ground plane, said electrical connection being positioned and configured to achieve a desired loop length of the RFID antenna, thereby tuning the RFID antenna to the predetermined frequency and enhancing its electrical properties for desired readability performance.

2. The RFID device of claim 1, wherein the electrical connection includes a weld joint positioned along a peripheral portion of the dielectric spacer, said positioning being configured to co-act with the ground plane to complete and tune the effective loop length of the RFID antenna around the predetermined frequency.

3. The RFID device of claim 2, wherein the peripheral portion comprises an area within 2 mm of an edge of the dielectric spacer.

4. The RFID device of claim 2, wherein the weld joint comprises a series of spot welds.

5. The RFID device of claim 4, wherein each spot weld includes a diameter in a range of 0.1 mm to 2 mm.

6. The RFID device of claim 1, wherein the antenna comprises a strap carrying an RFID chip.

7. The RFID device of claim 1, wherein the device is configured to operate at a frequency in a range of 860 MHz to 960 MHz.

8. The RFID device of claim 1, wherein the antenna comprises a conductive material selected from aluminum, copper, silver, or conductive ink.

9. The RFID device of claim 1, wherein the ground plane comprises a continuous layer of conductive material.

10. The RFID device of claim 1, further comprising an adhesive layer between the RFID antenna, the dielectric spacer, and the ground plane.

11. The RFID device of claim 9, wherein the adhesive layer includes a thickness in a range of 10 micrometers to 100 micrometers.

12. The RFID device of claim 1, further comprising a release liner over the ground plane.

13. The RFID device of claim 11, wherein the release liner includes a release force in a range of 10 grams per inch to 200 grams per inch.

14. The RFID device of claim 1, wherein the dielectric spacer includes a thickness in a range of 0.2 mm to 1.5 mm.

15. The RFID device of claim 1, wherein the dielectric spacer includes a dielectric constant in a range of 1 to 4.

16. The RFID device of claim 1, wherein the electrical connection includes a resistance less than 1 ohm.

17. The RFID device of claim 1, wherein the electrical connection includes a pull strength greater than 1 Newton.

18. The RFID device of claim 1, wherein the thickness of the dielectric spacer is configured to maintain a predetermined separation between the RFID antenna and the groundplane, thereby preventing a substantial frequency shift and sensitivity drop of the antenna when the RFID device is applied to items containing high dielectric constant materials.

19. The RFID device of claim 1, wherein the dielectric spacer includes a dielectric constant and thickness selected to provide impedance matching between the RFID antenna and free space when the RFID device is applied to items containing high dielectric constant materials.

20. The RFID device of claim 1, wherein the RFID antenna and the ground plane are correlatively shaped and sized to create a predetermined radiation pattern that maintains the performance of the RFID device when applied to various surfaces.

21. The RFID device of claim 1, wherein the electrical connection is configured to create a controlled current distribution between the antenna and the ground plane, thereby optimizing a radiation characteristic of the RFID device.

22. A system for manufacturing a radio frequency identification (RFID) device, comprising: a first supply mechanism configured to provide an RFID antenna configured to operate at a predetermined frequency; a second supply mechanism configured to provide a dielectric spacer over the RFID antenna; a third supply mechanism configured to provide a ground plane over the dielectric spacer; and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane; wherein the system is configured to produce an arrangement of the RFID antenna, the dielectric spacer, and the ground plane such that at least the thickness of the dielectric spacerand dielectric constant maintain the predetermined frequency and sensitivity of the antenna when the RFID device is in proximity to items containing high dielectric constant materials, and the connection mechanism is configured to form the electrical connection at a precise location to achieve a desired loop length for the RFID antenna, thereby tuning it to its predetermined frequency for desired readability performance..

23. The system of claim 22, wherein the connection mechanism comprises a welding device configured to create localized heating at specific points of contact between the RFID antenna and the ground plane.

24. The system of claim 23, wherein the welding device is configured to create localized heating through the dielectric spacer.

25. The system of claim 22, wherein the welding device is at least one of an inductive heating subsystem, a capacitive discharge heating subsystem, or a laser heating subsystem.

26. The system of claim 25, wherein the inductive heating subsystem is configured to induce eddy currents at an interface between the RFID antenna and the ground plane to form the electrical connection.

27. The system of claim 25, wherein the capacitive discharge heating subsystem comprises a bank of capacitors configured to store electrical energy.

28. The system of claim 27, further comprising a control unit configured to release the stored electrical energy in a series of timed pulses to form the electrical connection.

29. The system of claim 22, further comprising a web transport mechanism configured to continuously move at least one of the RFID antennas, the dielectric spacer, or the ground plane during the manufacturing process.

30. The system of claim 22, further comprising a cutting mechanism configured to separate individual RFID devices after formation of the electrical connection.

31. The system of claim 22, wherein the connection mechanism is configured to create a conductive pathway through non-conductive portions of the dielectric spacer to form the electrical connection.

32. The system of claim 22, wherein at least one of the supply mechanisms is configured to provide its respective component in a roll-to-roll format.

33. The system of claim 22, wherein the welding device comprises a welding head with a width in a range of 2.5 inches to 5 inches.

34. The system of claim 23, wherein the welding device includes a capacitor bank with a capacitance in a range of 600 pF to 1500 pF.

35. The system of claim 23, wherein the welding device includes a control system for adjusting weld parameters based on feedback from previous welds.

36. The system of claim 22, further comprising an adhesive applicator configured to apply an adhesive between at least two of the RFID antennas, the dielectric spacer, and the ground plane.

37. The system of claim 36, wherein the adhesive applicator is capable of dispensing adhesive at a rate in a range of 0.1 mL / min to 10 mL / min.

38. The system of claim 22, further comprising a release liner applicator configured to apply a release liner over the ground plane.

39. The system of claim 37, wherein the release liner applicator is configured to apply the release liner at a speed in a range of 1 m / min to 100 m / min.

40. The system of claim 21, further comprising a tension control system configured to maintain consistent tension across the RFID antenna, the dielectric spacer, and the ground plane during the manufacturing process.

41. A radio frequency identification (RFID) inlay, comprising:a substrate including an RFID antenna disposed thereon; a dielectric spacer attached to the RFID antenna and positioned between the antenna and a ground plane; and the ground plane is attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna; wherein the antenna is coupled to an RFID chip, and wherein the dielectric spacer includes at least a thickness and dielectric constant configured to maintain the predetermined frequency and sensitivity of the RFID antenna when the RFID inlay is applied to items containing high dielectric constant materials, and wherein the ground plane is configured to shield the RFID antenna from electromagnetically reflective surfaces to ensure enhanced performance by preventing unwanted reflections.

42. The RFID inlay of claim 41, wherein the ground plane is physically and electrically connected to a portion of the RFID antenna through a weld joint.

43. The RFID inlay of claim 42, wherein the weld joint is located along a peripheral portion of the dielectric spacer, said location being configured to establish a desired loop length for tuning the RFID antenna.

44. The RFID inlay of claim 42, wherein the weld joint comprises a series of spot welds.

45. The RFID inlay of claim 41, wherein the RFID antenna comprises a strap carrying an RFID chip.

46. The RFID inlay of claim 41, wherein the ground plane comprises a continuous conductive material and is configured to operate as a ground plane.

47. The RFID inlay of claim 41, wherein the dielectric spacer includes a thickness in a range of 0.2 mm micrometers to 1.5 mm.

48. The RFID inlay of claim 42, wherein the weld joint includes a resistance less than 1 ohm.

49. A method of manufacturing a radio frequency identification (RFID) device, comprising: providing an RFID antenna configured to operate at a predetermined frequency; positioning a dielectric spacer between the RFID antenna and a ground plane; providing the ground plane over the dielectric spacer; and forming an electrical connection between the antenna and the ground plane; wherein the method is configured to form an arrangement of the RFID antenna, the dielectric spacer, and the ground plane such that a thickness of the dielectric spacer and dielectric constant maintain the predetermined frequency and sensitivity of the RFID antenna when the RFID device is in proximity to items containing high dielectric constant materials, and the ground plane shields the RFID antenna from electromagnetically reflective surfaces and high radiation absorbing surfaces to ensure enhanced performance by preventing unwanted reflections and wherein the forming of the electrical connection is performed to achieve a desired loop length of the RFID antenna by connecting it to the ground plane, thereby tuning the RFID antenna to the predetermined frequency and enabling its desired readability.

50. The method of claim 49, wherein forming the electrical connection comprises welding the RFID antenna to the ground plane.

51. The method of claim 50, wherein welding is performed along a peripheral portion of the RFID antenna to the ground plane.

52. The method of claim 51, wherein the peripheral portion comprises an area within 2 mm of an edge of the dielectric spacer.

53. The method of claim 50, wherein welding comprises capacitive discharge welding.

54. The method of claim 53, wherein the capacitive discharge welding uses a welding device operating at a voltage in a range of 0 to 12V.

55. The method of claim 53, wherein the capacitive discharge welding uses a welding device operating at a discharge time in a range of 20 microseconds to 10 milliseconds.

56. The method of claim 50, wherein welding comprises creating spot welds between the RFID antenna and the ground plane.

57. The method of claim 49, further comprising applying an adhesive between at least of the RFID antenna, the dielectric spacer, and the ground plane.

58. The method of claim 57, wherein the adhesive includes a thickness in a range of 5 micrometers to 100 micrometers.

59. The method of claim 49, further comprising applying a release liner over the ground plane.

60. The method of claim 59, wherein the release liner includes a release force in a range of 10 grams per inch to 200 grams per inch.

61. The method of claim 49, wherein forming the electrical connection comprises using a non-contact welding technique.

62. The method of claim 61, wherein the non-contact welding technique is configured to minimize mechanical stress on the dielectric spacer.

63. The method of claim 49, wherein the RFID antenna is formed from a material selected from the group consisting of aluminum, copper, silver, and conductive inks.

64. The method of claim 49, wherein the RFID antenna is coupled with an RFID chip.

65. The method of claim 49, wherein the RFID antenna comprises a strap carrying the RFID chip.

66. The method of claim 49, wherein the ground plane comprises a continuous layer of conductive material.

67. The method of claim 49, wherein the dielectric spacer includes a thickness in a range of0.2 mm micrometers to 1.5 mm.

68. The method of claim 49, wherein the dielectric spacer includes a dielectric constant in a range of 1 to 4.

69. A radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the device comprising: an RFID antenna; a ground plane; a dielectric spacer positioned between the RFID antenna and the ground plane; and an electrical connection between the RFID antenna and the ground plane, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item and said electrical connection being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

70. A radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the device comprising: an RFID antenna; a ground plane; a dielectric spacer positioned between the RFID antenna and the ground plane; and an electrical connection between the RFID antenna and the ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item, and said electrical connection being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

71. A system for manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the system comprising: a first supply mechanism configured to provide an RFID antenna; a second supply mechanism configured to provide a dielectric spacer over the RFID antenna; a third supply mechanism configured to provide a ground plane over the dielectric spacer, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item; and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane, said connection mechanism being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

72. A system for manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the system comprising: a first supply mechanism configured to provide an RFID antenna; a second supply mechanism configured to provide a dielectric spacer over the RFID antenna, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item; a third supply mechanism configured to provide a ground plane over the dielectric spacer; and a connection mechanism configured to form an electrical connection between the RFID antenna and the ground plane, said connection mechanism being configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

73. A radio frequency identification (RFID) inlay configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the inlay comprising: a substrate including an RFID antenna disposed thereon;a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane; and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item; wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

74. A radio frequency identification (RFID) inlay configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the inlay comprising: a substrate including an RFID antenna disposed thereon; a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID inlay is in proximity to the high-dielectric content item; and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna; wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

75. A method of manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the method comprising: providing an RFID antenna; positioning a dielectric spacer between the RFID antenna and a ground plane;providing a ground plane configured to shield the RFID antenna from electromagnetic interference caused by the metallic item; and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length.

76. A method of manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the method comprising: providing an RFID antenna; positioning a dielectric spacer between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item; and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length.

77. A radio frequency identification (RFID) inlay configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, the inlay comprising: an RFID antenna; a dielectric spacer attached to the RFID antenna and positioned between the RFID antenna and a ground plane, said dielectric spacer having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID inlay is in proximity to the high-dielectric constant materials; and a ground plane attached to the dielectric spacer and positioned adjacent to a surface of the dielectric spacer remote from the RFID antenna, said ground plane being configured to shield the RFID antenna from electromagnetic interference caused by the metallic item;wherein the RFID antenna is coupled to an RFID chip, and an electrical connection between the RFID antenna and the ground plane is positioned and configured to tune the RFID antenna to its operational frequency by influencing its effective loop length.

78. A method of manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item, the method comprising: providing an RFID antenna; positioning a dielectric spacer between the RFID antenna and a ground plane; providing a ground plane configured to shield the RFID antenna from electromagnetic interference caused by the metallic item; and forming an electrical connection between the RFID antenna and the ground plane.

79. A method of manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a high-dielectric content item, the method comprising: providing an RFID antenna; positioning a dielectric spacer between the RFID antenna and a ground plane, said dielectric spacer at least having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric content item; and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length.

80. A method of manufacturing a radio frequency identification (RFID) device configured to provide effective radio frequency (RF) readability when applied to or in proximity to a metallic item and items comprising high dielectric constant materials, the method comprising:providing an RFID antenna; positioning a dielectric spacer between the RFID antenna and a ground plane, said dielectric spacer at least having a thickness and dielectric constant configured to maintain a stable operational frequency of the RFID antenna when the RFID device is in proximity to the high-dielectric constant materials; providing a ground plane configured to shield the RFID antenna from electromagnetic interference caused by the metallic item; and forming an electrical connection between the RFID antenna and the ground plane, said forming step being performed to tune the RFID antenna to its operational frequency by influencing its effective loop length.

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