planar microstrip antenna for uhf rfid daniel d deavours pi madhuri eunni madhuri@ittc ku edu n.
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Planar Microstrip Antenna for UHF RFID Daniel D. Deavours (PI), Madhuri Eunni - madhuri@ittc.ku.edu PowerPoint Presentation
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Problem - Materials changes critical antenna properties Air – Plastic – Glass – Water – Metal Max Min Air Near Metal

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planar microstrip antenna for uhf rfid daniel d deavours pi madhuri eunni madhuri@ittc ku edu
Problem - Materials changes critical antenna properties

Air – Plastic – Glass – Water – Metal

Max Min

Air Near Metal

Alien Squiggle in air readable at 12 ft. On glass, 8 ft. Directly on metal, 0 ft

Solution – Metal Mount Tag, microstrip antenna

Antenna 2

Antenna 1

Planar Microstrip Antenna for UHF RFID Daniel D. Deavours (PI), Madhuri Eunni - madhuri@ittc.ku.edu

Tag Performance

Metal Mount Tag

  • Balanced feed Planar microstrip antenna
  • Single Stub matching network– via free completely planar design
  • Thin (60 mil, εr = 2.2) substrate, ground plane, antenna layer and optional superstrate

Odd mode analysis Planar microstrip antenna – top view

Design

Highlights

  • Tag is designed to operate between 865 to 870MHz
  • Trade off is between reflection coefficient and Gain to optimize read distance
  • KU internally funded Commercialization grant
  • High Performance, Low – Profile Passive RFID tag with form factor 4”x6”
  • Easy Manufacturability; low cost
  • Read Distance upto 22 ft on any material
  • Anticipating 5 patents on the design
  • Ongoing research
    • Smaller matching networks and meandered antenna geometries for smaller form factor
    • Multi-resonant arrays for increased bandwidth

Gain vs frequency

3D radiation plot

Reflection coefficient

vs frequency

Surface currents