Antenna structures and methods for omni directional radiation patterns
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United States of America Patent
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Apr 26, 2016
Grant Date -
Mar 6, 2014
app pub date -
Aug 30, 2012
filing date -
Aug 30, 2012
priority date (Note) -
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Abstract
A device is provided for use with a radio frequency identification (RFID) chip that receives and modulates a radio frequency (RF) signal. A substrate of the device includes a first short dipole antenna structure that backscatters a received RF signal to produce a first radiation pattern having nulls. A set of connection pads couple the RF signal from the antenna to a frontend transmitter circuit of the RFID chip. A second antenna structure backscatters the received RF signal by electromagnetic coupling to the first antenna structure and produces a second radiation pattern that complements the nulls in the first radiation pattern.
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