An antenna system for a dual frequency RFID reader, having: a first antenna 206 arranged to operate at a first frequency, the first antenna comprising a conductive element in a substantially planar arrangement; and a second antenna 208 arranged to operate at a second frequency lower than the first frequency, the second antenna 208 comprising a substantially flat coil formed on a ferrite former 210; wherein the second antenna 208 is located substantially within the conductive element of the first antenna 206.

Provided is a smart card that can prevent malfunction in the smart card and improve stability of radio frequency communication by removing interference of an AC signal generated at the antenna terminal of the smart card. The smart card includes: a dual antenna configured of a first antenna and a second antenna for performing radio frequency communication with a card reader; an IC chip electrically connected to the first antenna to perform radio frequency communication through the first antenna; a power generation unit for generating DC power by converting a radio frequency signal received through the second antenna; a control unit for receiving the DC power generated from the power generation unit to control various modules; and a cut-off unit arranged between the first antenna and the IC chip to cut off a radio frequency signal received through the first antenna under the control of the control unit.

A device includes a first inductor and a second inductor. The first inductor has a first inductive coupling profile. A first circuit component is coupled to the first inductor. A second inductor has a second inductive coupling profile. A second circuit component coupled to the second inductor.

A wearable article, system, and methods may include a structure configured to enclose a human body part. A first antenna, positioned with respect to the structure, is tuned to communicate, while the wearable article is being worn, according to a first wireless communication modality with a first external antenna. A second antenna, positioned with respect to the structure, is tuned to communicate according to a second wireless communication modality with a second external antenna different than the first external antenna, the second communication modality being different than the first communication modality. A transceiver, coupled to at least one of the first antenna and the second antenna, is configured to communicate via one of the first and second antennas based, at least in part, on the one of the first and second antennas coming into wireless communication contact with a corresponding one of the first and second external antennas.

The manufacturing method of the antenna pattern has: a step of forming a dipole antenna on a front surface of a continuous substrate while conveying the continuous substrate; and a step of forming a sub-element on a back surface of the continuous substrate.

A method of incorporating a second conductor into a RFID strap device and the resulting device in multiple embodiments is disclosed. The second conductor adds functionality via coupling between the strap conductor and the second conductor. The functionality added can be a secondary antenna operating at a different frequency than the first antenna that is driven by the strap pads, a sensing capability, a drive for an emissive device such as an LED, or an interface to one or more semiconductor devices mounted onto the second conductor.

Described examples relate to a radio frequency identification (RFID) device configured to be detachably coupled to an object. The RFID device may include a first RFID tag comprising a first antenna, the first antenna comprising a first arcuate element and a second arcuate element, wherein the first accurate element and second arcuate element are arranged in a semicircle. The RFID device may also include a second RFID tag comprising a second antenna.

A wearable article, system, and methods may include a structure configured to enclose a human body part. A first antenna, positioned with respect to the structure, is tuned to communicate, while the wearable article is being worn, according to a first wireless communication modality with a first external antenna. A second antenna, positioned with respect to the structure, is tuned to communicate according to a second wireless communication modality with a second external antenna different than the first external antenna, the second communication modality being different than the first communication modality. A transceiver, coupled to at least one of the first antenna and the second antenna, is configured to communicate via one of the first and second antennas based, at least in part, on the one of the first and second antennas coming into wireless communication contact with a corresponding one of the first and second external antennas.

A RFID tag that includes a first RF chip, a second RF chip, a first wiring and a second wiring is provided. The first RF chip and the second RF chip are adjacent and connected to each other, and each of the first RF chip and the second RF chip has two pads. Said two pads of the first RF chip and said two pads of the second RF chip are connected to two complementary antennas. The first wiring conducts said two pads of the first RF chip to one of said two complementary antennas. The second wiring conducts said two pads of the second RF chip to the other of said two complementary antennas.

A dual frequency HF-UHF RFID integrated circuit including a power supply. The power supply includes: an HF branch including an HF rectifier and a linear voltage regulator, wherein the HF rectifier is configured to be connected to a resonance circuit formed by a HF antenna-coil and a resonance capacitor and wherein the HF rectifier is connected to the linear voltage regulator; a UHF branch including a UHF rectifier and a shunt voltage regulator, wherein the UHF rectifier has a charge pump and is configured to be connected to a UHF antenna and wherein the UHF rectifier is connected to the shunt voltage regulator; and a supply line, wherein the linear voltage regulator and the shunt voltage regulator are both connected to the supply line of the power supply.