Radio frequency identification system and antenna system
OwnerRobert G. Yeweninventor
Life of this patent
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Abstract
A radio frequency identification (RFID) system is disclosed. The RFID system may include a plurality of antenna systems. Each pair of antenna systems may form an interrogation zone or write zone. A power splitter, switch, multiplexer or the like may alternately drive each antenna system of each pair of antenna systems to expand the interrogation zone or write zone for a selected or given power or to reduce a signal strength or power to transmit over a predetermined range of the interrogation or write zone.
Claims89
An antenna system, comprising:
- a first antenna element;
- a second antenna element connected in parallel with the first antenna element;
- and
- a balun tuning circuit to balance an inductance between the first and second antenna elements.
An antenna system, comprising:
- a first antenna element;
- a second antenna element connected in parallel with the first antenna element;
- and
- a balun tuning circuit connected in parallel with the first and second antenna elements with one terminal being slidably coupled to a common side of the first and second antenna elements to balance an inductance between the first and second antenna elements.
A balun device, comprising:
- a tuning circuit;
- and
- a bracket to couple the tuning circuit to first and second antenna elements,
- wherein the bracket is movable relative to the first and second antenna elements to balance an inductance between the first and second elements.
A radio frequency identification (RFID) system, comprising:
- a plurality of antenna systems, each pair of antenna systems forming an interrogation zone or write zone;
- and
- a power splitter to alternately drive each antenna system of each pair of antenna systems to expand the interrogation zone or write zone for a selected power or to reduce power or signal strength to operate over a predetermined range of the interrogation or write zone.
A radio frequency identification (RFID) system, comprising:
- a plurality of antenna systems, each pair of antenna systems forming an interrogation zone or write zone and wherein each antenna system of each pair includes:
- a first antenna element,
- a second antenna element connected in parallel with the first antenna element, and
- a balun tuning circuit slidably coupled to a common side of the first and second antenna elements to balance an inductance between the first and second antenna elements;
- and
- a power splitter to alternately drive each antenna system of each pair of antenna systems to expand the interrogation zone or write zone for a selected power or to reduce a signal strength or power to operate over a predetermined range of the interrogation or write zone.
A method of communicating with a transponder, comprising:
- alternately driving each antenna system of at least one pair of antenna systems forming an interrogation zone or write zone;
- transmitting a signal to any transponder in the interrogation zone or write zone;
- and
- controlling movement of an object or person associated with the transponder in the interrogation zone or write zone in response to a signal from the transponder.
A method of communicating with a transponder, comprising:
- one of expanding an interrogation zone or write zone for a selected power or reducing a signal strength or power for a predetermined range of the interrogation zone or write zone by alternately driving each antenna system of a pair of antenna systems forming the interrogation zone or write zone;
- and
- one of interrogating or writing into a memory of any transponder in the interrogation zone or write zone.
A method of making an antenna system, comprising:
- forming a first antenna element;
- forming a second antenna element connected in parallel with the first antenna element;
- and
- forming a balun tuning circuit connected in parallel with the first and second antenna elements with one terminal being slidably coupled to a common side of the first and second antenna elements to balance an inductance between the first and second antenna elements.
A method of making a balun device, comprising:
- forming a tuning circuit;
- and
- forming a bracket to connect the tuning circuit to first and second antenna elements, wherein the bracket is movable relative to the first and second antenna elements to balance an inductance between the first and second elements.
A method of making a radio frequency identification (RFID) system, comprising:
- forming a plurality of antenna systems, each pair of antenna systems
- forming an interrogation zone or write zone;
- and
- forming a power splitter to alternately drive each antenna system of each pair of antenna systems to expand the interrogation zone or write zone for a selected power or to reduce a signal strength or power for a predetermined detection or operating range of the interrogation or write zone.
Dependencies are inferred from the claim text.