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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

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

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  1. 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

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