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7388464 |
Location system and communication
A location system comprises a plurality of transponders whose locations are detectable by a base system. The base system interrogates ( 51 - 55 ) the transponders one at a time in accordance with a...
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7385477 |
Radio frequency data communications device
A radio frequency identification device includes an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder....
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7382229 |
Method of managing a plurality of electronic microcircuit chip readers and equipments for implementing said method
Method and system for coordinated management of a plurality of contactless radio-frequency readers of chips incorporating electronic microcircuits. The method includes transmitting, in a first time...
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7376391 |
Wireless data transmission between base station and transponder with encoding/decoding parameter adjusted dependent on header symbol duration
Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section containing at least a reference symbol, and a...
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7372365 |
Methods, systems and computer program products for automated location and monitoring of mobile device
Systems are provided for providing location information associated with a mobile device. The systems include a location circuit and an identification circuit. The location circuit is integrated...
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7372364 |
Algorithm for RFID security
Techniques for detecting radio-frequency identification (RFID) tags are disclosed. For example, an exit control system is described that detects unauthorized removal of articles from a protected...
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7372359 |
Programmable-code electromagnetic transponder
An electromagnetic transponder including: a parallel oscillating circuit adapted to extracting a supply signal from a radiated field; in parallel with the oscillating circuit, several branches each...
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7369040 |
Transmitter modulation switching
An example receiver/transmitter for a passive start and entry system switches between amplitude shift keyed modulation and frequency shift keyed modulation to maintain clear uninterrupted and...
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7369036 |
Method and system of information exchange between an interrogator device and transponder devices that takes into account the level of ambient noise
A method and apparatus of information exchange between an interrogator device and a plurality of transponder devices are disclosed. Each of the transponder devices is equipped with a different...
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7365633 |
Vehicle remote control apparatus and vehicle remote control system using the same
A vehicle remote control apparatus has: A) a first transmitter for outputting an authentication request signal to a mobile device including a radio terminal assigned with an identification code...
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7362212 |
Communication methods, systems, apparatus, and devices involving RF tag registration
One technique of the present invention includes a number of Radio Frequency (RF) tags that each have a different identifier. Information is broadcast to the tags from an RF tag interrogator. This...
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7359696 |
Communication apparatus, portable terminal and communication control program
A communication apparatus, including: an identification information request receiver configured to conduct wireless communication a plurality of times without interruption with a portable device; a...
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7355525 |
Vehicle communication system
A vehicle communication system is provide with a host vehicle two way communication device, an omni-directional antenna, a bi-directional antenna, a vehicle positioning component, a vehicle map...
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7345576 |
Method and apparatus for resolving RFID-based object traffic transactions to a single container in the presence of a plurality of containers
A method for resolving RFID-based object traffic transactions to a single container in the presence of a plurality of containers, where the method includes the steps of: monitoring RFID object...
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7336154 |
Method for selecting one or more transponders
One or more transponders are selected by a base station out of a plurality of transponders. For this purpose an identification bit sequence (IB) that is or includes a random number bit sequence...
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7319398 |
Reconfigurable and replaceable RFID antenna network
An RFID reader system for tracking and locating RFID tags is described, along with an antenna suitable for use in this system, and an antenna configuration apparatus for use in this system. The...
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7304577 |
Variable frequency radio frequency identification (RFID) tags
Various radio frequency identification (RFID) tags are described that dynamically vary their resonant frequency to reduce or eliminate the potential effects of electromagnetic “tag-to-tag”...
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7286041 |
Maintenance of an anticollision channel in an electronic identification system
Transponders in a system execute commands issued by an interrogator. The interrogator sends out interrogation signals, and a transponder answers with a start signal. The interrogator then modifies...
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7284703 |
System and method for minimizing unwanted re-negotiation of a passive RFID tag
A system and method is provided for minimizing the unwanted re-negotiation of passive RFID tags. Each tag stores a confirmed read flag to indicate whether the tag has been previously read. During...
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7283035 |
Radio frequency data communications device with selectively removable antenna portion and method
An adjustable radio frequency data communications device has a monolithic semiconductor integrated circuit with integrated circuitry, interrogation receiving circuitry provided on the monolithic...
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7277681 |
Interrogator of moving body identification device
To reduce the size, weight and cost of an interrogator which is included in an RFID system and required to have a high output power, the interrogator for transmitting a signal shares a radio wave...
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7274292 |
Proximity management system and method using radio-frequency identification tags
A master controller for managing items tagged with radio-frequency identification (RFID) tags includes a transceiver to transmit interrogation signals to the RFID tags and to receive response...
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7274284 |
Method for RF card detection in a contactless system
A method and processor-readable storage medium for performing the method of identifying RF cards in a card reader's field. Polling requests are sent to cards in a card reader's field. Where a clear...
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7253719 |
Multi-oscillator clock signals
Methods and apparatus may operate to use multiple oscillators to generate a demodulator clock signal and a modulator clock signal within a radio-frequency identification (RFID) circuit. The...
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7253717 |
Method and system for communicating with and tracking RFID transponders
An RFID system and method for communicating between a host computer, one or more interrogators connected to the host computer, and a large body of transponders distributed within an area covered by...
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7250863 |
Transponder and a sensing system using the transponder
A measuring system enabled to simultaneously start measurement by a plurality of transponders by communication between a reader/writer and a plurality of transponders each with a built-in sensor is...
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7246751 |
RFID tags calibrating backscattering period also for non-integer divide ratios
An RFID tag that receives a calibration instruction from a reader can determine the basic backscatter period of the symbols to be backscattered. According to some embodiments, when the instruction...
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7243855 |
Contactless identification tag, data communication system and contactless identification tag control program
A data communication system includes a host device, a reader/writer device and a plurality of contactless identification tags. The contactless identification tag includes a data reception section,...
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7239228 |
Apparatus for mediating communication between controller and transponders of many moving objects and method for controlling the same
Disclosed are a communication mediation apparatus and a method for controlling the same for performing communication mediation while reducing a communication miss rate caused by collision of data....
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7221259 |
Electronic label interrogation through incidental electromagnetic radiation
A system for electromagnetically interrogating electronically coded labels is provided. The system includes at least one electromagnetically interrogatable electronic coded label, an interrogator...
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7221255 |
Embedded automotive latch communications protocol
A latch communications method and system are disclosed herein, which generally includes a communications receiver and transmitter unit associated with a latch. Additionally, an interface component...
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7215239 |
Non-contact smart card interrogator, wherein across a transmission line from an antenna to a receiver the signal modulation varies between amplitude modulation and phase modulation
In a non-contacting smart card interrogator ( 1 ) a first end (A) of an eighth-wave transmission line ( 13 ) is connected to a terminal connecting a first receiver ( 16 ) to a transmission line (...
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7196623 |
Remote reminding system
The inventive device functions to warn a user of the undesirable condition of an appliance or other equipment. An “undesirable condition” may be an automatic garage door that is left open, a...
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7193504 |
Methods and apparatuses for identification
An identification system includes a reader and one or more tags. The reader identifies tags such as radio frequency (RF) tags. The system divides a number space into n bins, wherein each bin is...
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7161469 |
Reading protocol for transponders of electronic identification system
A method of reading a plurality of transponders 14.1 to 14. n forming part of an electronic radio frequency identification system 10 comprises the steps of prompting the transponders at 38 ...
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7161464 |
Vehicle security system and method of controlling the same
Herein disclosed is a vehicle security system for protecting a vehicle against use by an unauthorized person, comprising: a base station, located away from the vehicle, for transmitting a control...
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7158561 |
Communication system, communication device, and communication method
Respective nodes N 1 to N 3 only detect a carrier, and the node N 3 sets a random time between a time after a certain period of time t 1 and a time until a certain period of time t 2 after the...
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7158010 |
Circuit arrangement and method for phase modulation in a backscattering transponder
A circuit arrangement for phase modulation in an input circuit of a backscattering transponder includes a varactor and at least one capacitor connected in series between two antenna terminals, and...
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7151436 |
Receiving/backscattering arrangement and method with two modulation modes for wireless data transmission as well as modulation arrangement therefor
For transmitting data, a receiving/backscattering arrangement receives, modulates and reflects or backscatters electromagnetic waves emitted by a base station. The modulation corresponds to the...
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7132946 |
Variable frequency radio frequency identification (RFID) tags
Various radio frequency identification (RFID) tags are described that dynamically vary their resonant frequency to reduce or eliminate the potential effects of electromagnetic “tag-to-tag”...
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7126994 |
Communication station and data carrier with improved acknowledgement measures
In a method of communication between a communication station ( 1 ) and a plurality of data carriers ( 2 ) an interrogation signal (IDB) is generated with the aid of interrogation signal generating...
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7119664 |
Deep sleep in an RFID tag
Systems and techniques to provide radio frequency identification tags including a non-responsive state, which is independent of supplied power, initiated in conjunction with a tag communications...
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7119661 |
Combined tire pressure monitoring and keyless entry receiver
A system for monitoring conditions within a tire ( 12 ) including a sensor assembly ( 14 ) including a pressure sensor ( 36 ), an accelerometer ( 34 ), a temperature sensor ( 32 ), and a...
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7109844 |
Transponder, interrogator, and communication system
A communication system 1 includes interrogators 10, 11 and transponders 20, 21, 22 . The interrogator 10 transmits a carrier wave, FC 1, to the transponders 20, 21, 22, and the...
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7106174 |
Anti-collision tag apparatus and system
This invention relates to radio frequency identification (RFID) apparatus comprising a reader/writer and transponders (tags) such that 2 or more transponders are capable of operating simultaneously...
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7102488 |
Method for selecting transponders
In a method of selecting one or more transponders, the time duration of a reference interval is transmitted by the base station to the transponders in the header section of an information packet,...
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7095311 |
Identification coding schemes for modulated reflectance systems
An identifying coding apparatus employing modulated reflectance technology involving a base station emitting a RF signal, with a tag, located remotely from the base station, and containing at least...
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7091860 |
Multi-frequency identification device
The present invention comprises a radio frequency identification device that utilizes multiple operating frequencies. In one embodiment of the present invention, one frequency (e.g., an ultra-high...
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7091827 |
Communications control in a security system
A system and method for controlling communications in a security system based upon RFID techniques. The RFID reader of the security system can be provided with multiple modulation techniques,...
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7088248 |
System and method for selectively reading RFID devices
A radio frequency identification (RFID) device detection system includes an RFID device reader configured to detect RFID devices within a predetermined designated area, and two or more jamming...
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