Geissler Companies, LLC

Digital Angel Corporation

Destron Fearing Corporation

Yuri Smirnov

Ezequiel Mejia

Daniel L Johnson

Radio-frequency transmission and reception circuitry is adapted for use with a high-quality-factor antenna. On the transmission side, control circuitry is provided to maintain resonance at the transmission frequency. On the reception side, multiple receive paths are independently controllable for temporal alignment.

Communications circuitry supporting high-Q antenna

Radio-frequency transmission and reception circuitry is adapted for use with a high-quality-factor antenna. On the transmission side, control circuitry is provided to maintain resonance at the transmission frequency. On the reception side, multiple receive paths are independently controllable for temporal and amplitude alignment.

Tag reader transmitter with high-Q antenna

A biomedical implant includes a wall enclosing at least a portion of the implant. The wall includes a first stratum and a second stratum conformal with the first stratum. An interlayer is provided between the first and the second strata, and includes a structure that produces capillary pressure in an infiltrating fluid in response to rupture of the first stratum or the second stratum resulting in entry of the infiltrating fluid into the interlayer. A detector is exposed to the interlayer and configured to detect a presence, if any, of the infiltrating fluid and output a detection state indicator. A communication circuit is communicatively coupled to the detector and configured to communicate the detection state indicator to a reader external to the patient.

Passive sensors and related structures for implantable biomedical devices

Tag reader receiver with high-Q antenna

A system and method of automatically tuning a reading device that remotely monitors RFID tags or transponders. The reading device utilizes the phase signal of an antenna signal wherein the harmonic of the antenna signal is filtered through a signal coupling transformer and utilizes the antenna current reading to determine the optimal capacitance setting for the reader by adjusting capacitors and storing the relative phase signal and level of current in a processor. In one embodiment, the method comprises supplying power to the reading device, monitoring the power supply, storing data related to the monitored power supply, emitting a signal from an antenna, filtering the harmonic of such signal, outputting the phase signal to a processor and adjusting capacitors based on the phase signal and monitored current.

Automatic tuning reader

A method and apparatus are provided to identify objects, including livestock. In one embodiment, a device is presented that includes a reflector shield mounted proximate the interrogator that is mounted on or near a livestock chute gate. The reflector shield decreases the amount of the inductive field absorbed by the livestock chute gate, thereby allowing transponders attached to livestock to be read. In a separate embodiment, multiple windings are used to form an interrogator with greater excitation and receiver capability due to the orientation of the wire windings. The multiple-winding interrogators may be used with or without the reflector shield. In yet a separate embodiment, a method is presented to utilize the device of the present invention to identify livestock moving through a livestock chute.

Livestock chute scanner

An omni-directional RFID antenna is provided for use with a remote interrogator/reader system used for identifying tagged animals. A pair of antenna coils are arranged in a crossing pattern that results in the creation of an omni or multi-directional electromagnetic field. Additionally, the crossing pattern creates out of phase null zones at quadrants within the crossing pattern of the antennae that reduces interference caused by RF noise generated from the environment. The omni-directional electromagnetic field effectively surrounds each of the null zones thereby allowing an RFID transponder to be successfully interrogated despite the orientation of the transponder as it passes through the electromagnetic field.

Omnidirectional RFID antenna

A flexible interrogator antenna design having a single antenna with an inner and an outer antenna coil positioned in a flat, flexible, rectangular housing or mat which can be positioned in a configuration having two sides and a top across an easily erected temporary frame to form a walkthrough corridor or chute through which livestock having an attached transponder can be driven. The antenna is driven to generate multi-directional electromagnetic fields in each of an 'X', 'Y' and &lsquo;Z&rsquo; axis associated with the walkthrough to detect transponders coming into the fields, regardless of transponder orientation.

Growing community of inventors

Eagan, MN, United States of America

Yuri Smirnov