Patent
Antenna matching circuit
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TLDR
In this paper, a matching circuit for radio frequency identification tag antennas configured for modulated backscatter was proposed, including a stub circuit coupled to a detector diode and an antenna and sized and shaped to match a predetermined frequency.Abstract:
A matching circuit for use with radio frequency identification tag antennas configured for modulated backscatter, the circuit including a stub circuit coupled to a detector diode and an antenna and sized and shaped to match a predetermined frequency. The stub circuit is also designed to couple to the antenna such that a resulting phase is seen at the output, preferably 180° from that seen at the input. In addition, the stub circuit is structured to perform as an antenna, thus increasing the sensitivity of the overall circuit and maximizing efficiency and performance.read more
Citations
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Patent
Semi-passive radio frequency identification (RFID) tag with active beacon
TL;DR: A radio frequency beacon device for use with a backscatter interrogator includes a processor, a receiver coupled to the processor, and an active transmitter coupled to a processor as discussed by the authors, the active transmitter being configured to transmit an RF signal, in response to a trigger signal.
Patent
Method of simultaneously reading multiple radio frequency tags, RF tags, and RF reader
TL;DR: In this article, an RF tag system, comprising an RF reader configured to issue a plurality of different RF commands and to provide a continuous RF illumination field, including a permanent identification, is presented.
Patent
Rfid receiver apparatus and method
TL;DR: An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator including a single grounded-coplanar wave-guide circuit board and at least one surface mount integrated circuit supported by the circuit board.
Patent
Remote communication devices, radio frequency identification devices, wireless communication systems, wireless communication methods, radio frequency identification device communication methods, and methods of forming a remote communication device
Freddie W. Smith,Dirgha Khatri +1 more
TL;DR: In this paper, the authors present a method of forming a remote intelligent communication device (RIC) consisting of an antenna coupled with communication circuitry and substantially tuned to a plurality of frequencies, the antenna being configured to communicate wireless signals corresponding to the communication signals including at least one of receiving wireless signals and outputting wireless signals.
Patent
Radio frequency security system, method for a building facility or the like, and apparatus and methods for remotely monitoring the status of fire extinguishers
TL;DR: A system for remotely monitoring the status of one or more fire extinguishers includes means for sensing at least one parameter of each fire extinguisher, means for selectively transmitting the sensed parameters along with information identifying the fire extinguiers from which the parameters were sensed as discussed by the authors.
References
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Patent
High-performance mobile power antennas
TL;DR: In this paper, the authors show that an RFID tag's mobility can be increased and cost can be decreased by using high-performance mobile power antennas instead of battery powered tags.
Patent
Energy transfer in an electronic identification system
TL;DR: In this paper, the inductor and capacitance values of the matching circuit are calculated to match the antenna impedance to the equivalent load of the transponder circuit as seen via the power rectification circuits of the Transponder.
Patent
Rectifying antenna circuit
TL;DR: A rectifying antenna circuit for a passive RF transponder comprising a series resonant circuit of an antenna, a voltage rectifier circuit including a diode and a capacitance shunting the diode, the capacitance providing a primary voltage amplification role and the diodes providing a rectification and a voltage amplifier role is described in this article.
Patent
Interrogator circuit arrangement
TL;DR: In this article, an interrogator circuit for use with a semi-passive transponder of a type which reflectively modulates an incoming signal (28) is described, which comprises an antenna (4), a transistor (8), a matching network (6) connecting to the antenna and an input of the transistor and means (12, 14) for operating the transistor such that it self-oscillates and radiates power from the antenna, and simultaneously acts as a selfoscillating mixer to produce an output (40).