An RFID tag is disclosed comprising a dielectric substrate having a first side and an opposite second side, and with an antenna arranged on the first side of the dielectric substrate. The antenna defines a gap and is configured to operate at an operation frequency. The RFID tag further comprises an RFID chip electrically coupled to the antenna across the gap. A shielding conductor is arranged on the second side of the dielectric substrate, and preferably underlaying the gap, wherein the shielding conductor is configured to limit the voltage across the gap when the antenna is exposed to a microwave frequency of a microwave oven.

Various embodiments illustrated herein disclose a radio-frequency identification (RFID) reader having a first RFID tag having a first antenna element operating at a first transmit power. The first RFID tag receives, in a first time interval, a first interrogation command from a first RFID reader through the first antenna element. The first RFID tag transmits, in the first time interval, a first response signal to the first RFID reader. The RFID reader comprises a second antenna element that operates at a second transmit power and a processor communicatively coupled to the second antenna element. The processor transmits, in the first time interval, a second interrogation command to one or more second RFID tags through the second antenna element. The first RFID tag transmits, in a second time interval, a third interrogation command to a first RFID tag of a second RFID reader through the first antenna element.

Implantable transponders comprising no ferromagnetic parts for use in medical implants are disclosed herein. Such transponders may assist in preventing interference of transponders with medical imaging technologies. Such transponders may optionally be of a small size, and may assist in collecting and transmitting data and information regarding implanted medical devices. Methods of using such transponders, readers for detecting such transponders, and methods for using such readers are also described.

There is described a rectifier circuit for providing and limiting a supply voltage to an RFID tag, the circuit including a pair of antenna input terminals configured to receive an input signal from an RFID tag antenna. A plurality of charge pump stages are coupled in cascade in such a way that an input terminal of a first charge pump stage in the cascade is connected to ground and an input terminal of each subsequent charge pump stage in the cascade is coupled to an output terminal of the preceding charge pump stage in the cascade. A control logic is configured to select the output terminal of one charge pump stage among the plurality of charge pump stages to provide the supply voltage. Furthermore, an RFID tag and a method of providing and limiting a supply voltage to an RFID tag are described.

Provided is a transparent antenna comprising a transparent base material, an antenna part, and a joint part electrically bonded to the antenna part, the antenna part and the joint part being arranged on the transparent base material, wherein the joint part has a first conductive pattern and a first opening part without the first conductive pattern formed thereon, the antenna part has a second conductive pattern and a second opening part without the second conductive pattern formed thereon, surface free energy E.sub.1 of the first conductive pattern is 60 mJ/m.sup.2 or less, and surface free energy E.sub.0 of the transparent base material at the first opening part is larger than the surface free energy E.sub.1.

The present invention relates to technological improvements, use of these improvements and data analysis to provide for improved surgical procedure efficiency, efficacy, and safety. Specifically, improved radio frequency identification (RFID) enabled technology is utilized to discover and rectify significant inefficiencies, safety concerns and risks involved with surgical procedures through improved surgical implement tracking, both temporally and spatially, and data analytics for gathering, tracking and analyzing of instrument use singly and in combination.

A smart card includes an antenna to transmit and to receive a radio frequency signal, a rectifier to rectify a signal received through the antenna to output a rectified voltage, a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage, a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation and the second operation according to a mode selection signal, a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal, a load modulator to vary a resistance of the antenna to perform a load modulation, and a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated.

The present disclosure is generally directed to an RFID tag for use with a metal fastener where the fastener operates as the antenna of the RFID tag. The RFID tag includes a microchip for storing data. The chip is electrically coupled to the metal fastener in order to receive and transmit the RF signal, the metal fastener thereby operating as the antenna for the RFID tag.

An inventory management system and method using RFID tags for the tracking and management of individual items of inventory or work-in-process. The system uses a cloud-based service device to manage inventory at a facility via a communications hub. RFID printers, RFID readers, and antennas located at the facility relay information through the communications hub. Movement of items is monitored by tracking RFID tags associated with each item. Information on the tracked items may be recorded, displayed, and used to generate reports and notifications by the cloud-based services device. Historical tracking records may also be displayed.

An antenna structure comprises an impedance matching part, a first conductive structure and a second conductive structure. The first conductive structure with a first length along a first direction is coupled to a first side of the impedance matching part and has a plurality of first polygon conductive structures, each of which is coupled to each other through a first conductive element. The second conductive structure with a second length along a first direction is coupled to a second side of the impedance matching part and has a plurality of second polygon conductive structures, each of which is coupled to each other through a second conductive element, wherein the second length is larger than the first length. The first and second polygon conductive structures are protrusion toward the second direction. In one embodiment, the antenna structure can be applied on an object having metal housing or liquid contained therein.