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.

An antenna device includes a coil including first linear conductors on a first principal surface side of a multilayer body, second linear conductors on a second principal surface side, first end-surface conductors and second end-surface conductors disposed on end surfaces. Each of the first linear conductors includes a first main portion, a first end portion, and a second end portion. Each of the second linear conductors includes a second main portion, a third end portion, and a fourth end portion. The width of each of the first end-surface conductors is smaller than the width of the first main portion and the width of the second main portion. The width of each of the second end-surface conductors is smaller than the width of the first main portion and the width of the second main portion.

According to various aspects and technical advantages, an apparatus for electronic shelf labels includes a controller circuit for communicating with communication devices using a contactless communication protocol, a set of two or more antenna coils, each antenna coil located at a known position relative to the controller circuit, and a switch for selectively coupling the controller circuit to one or more of the set of antenna coils. The controller circuit is configured to determine a physical location of a communication device based on which antenna coil from the set of antenna coils the communication device is using to communicate with the controller circuit

An antenna device or a communication terminal device including the antenna device includes ground conductor, which serves as a plate-shaped conductor and is provided in an inner layer of a circuit board. An antenna coil is mounted so that a first main surface of a magnetic core faces the circuit board. The antenna coil is arranged so that a first conductor portion of a coil conductor is at a position that is closer to the ground conductor than a second conductor portion. The antenna coil is arranged so that the first conductor portion of the coil conductor is positioned in the vicinity of a longitudinal direction end portion of a casing, and the first conductor portion of the coil conductor is bent in a direction toward the ground conductor.

An antenna device includes a resin multilayer board in which a plurality of resin sheets are stacked, and a coil conductor provided in the resin multilayer board. A plurality of line portions of the coil conductor are provided on a lower surface of the resin sheet. When a magnetic material core is preliminarily pressure-bonded to the resin sheet, the magnetic material core is fractured along the line portions and cracks occur. Thus, the resin sheet with the magnetic material core in which the cracks have been formed is fully pressure-bonded together with the other resin sheets.

A radio IC device includes an electromagnetic coupling module includes a radio IC chip arranged to process transmitted and received signals and a feed circuit board including an inductance element. The feed circuit board includes an external electrode electromagnetically coupled to the feed circuit, and the external electrode is electrically connected to a shielding case or a wiring cable. The shielding case or the wiring cable functions as a radiation plate. The radio IC chip is operated by a signal received by the shielding case or the wiring, and the answer signal from the radio IC chip is radiated from the shielding case or the wiring cable to the outside. A metal component functions as the radiation plate, and the metal component may be a ground electrode disposed on the printed wiring board.

A non-contact data receiving/transmitting body is provided which includes an IC chip, a first antenna to which the IC chip is connected, and a second antenna for use as a booster that resonates with the first antenna in a non-contact manner. The first antenna is a ring-shaped antenna having at least three straight portions. The second antenna has a central portion that is bent such that parts of the central portion extend respectively along the three straight portions of the first antenna and are at an angle equal to or greater than 90° to each other. The IC chip is provided on the three straight portions of the first antenna and is connected to the first antenna at the straight portions.

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.

An electronic communications device includes a body of semiconductor material with an integrated electronic circuit, an inductive element, and a capacitive element. The capacitive element is formed by a first electrode and a second electrode positioned between the inductive element and the integrated electronic circuit. Tuning of the device circuitry is accomplished by energizing the inductive/capacitive elements, determining resonance frequency, and using a laser trimming operation to alter the structure of one or more of the first electrode, second electrode or inductive element and change the resonance frequency.

A smart card includes a card body, a transmission unit, a fingerprint sensor, a processing unit and a cover layer. The card body is formed with a cavity. The transmission unit is disposed on the card body, and outputs electricity. The fingerprint sensor is connected to the transmission unit, is accommodated in the cavity, and generates a detection signal after receiving the electricity. The processing unit is disposed in the card body, is connected to the transmission unit and the fingerprint sensor, and performs signal processing on the detection signal after receiving the electricity. The cover layer is disposed in the cavity and covers the fingerprint sensor.