UHF RFID Reader with Improved Antenna System
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United States of America Patent
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Issued Date -
Sep 24, 2015
app pub date -
Oct 11, 2013
filing date -
Oct 11, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a RFID reader with an antenna system for emitting and receiving RFID signals. The antenna system includes at least a first inverted F antenna and a second inverted F antenna each having a feed element, a radiating element with a first end coupled to the feed element and a second end free, and a tuning element having a first end coupled to the ground plane and a second end coupled to the first end of the radiating element. The radiating elements of the two inverted F antenna extend in a first direction and a second direction respectively, said first and second directions being offset by a non-zero sequential rotation. In addition, the two inverted F antennas are isolated from each other by a quarter wavelength slot etched in the ground plane between the two antennas.
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