Lossy substrate to emulate resistor-loaded microstrip antenna for passive UHF RFID tags

University of Kansas
posted on 01/12/2006

Use of a resistor chip-loaded microstrip has been established as a way to make a microstrip antenna have larger bandwidth. It is known that selective use of a lossy substrate can have similar effect. This invention is to use a lossy substrate along the radiating edge(s) of the microstrip antenna to achieve the same affect as a resistor.

Suggested Uses

The invention is intended for use of UHF RFID tags, where high efficiency and thin form factors are a premium. It could potentially be applicable to any of the numerous applications where microstrip antennas are currently used in UHF frequency ranges (e.g., cell phones, GPS, some satellite communications). However, those fields seem to be more advanced than the RFID field.

Detailed Description

Use of a resistor chip-loaded microstrip has been established as a way to make a microstrip antenna have larger bandwidth. It is known that selective use of a lossy substrate can have similar effect. This invention is to use a lossy substrate along the radiating edge(s) of the microstrip antenna to achieve the same affect as a resistor.

File Number: KUCR # 2006 FY 01 IT

Other Information: *State of Development* Available for license