RFID tag and antenna
First Claim
1. An RFID tag comprising:
- a) an RFID chip for storing data;
b) an antenna which is connected to the RFID chip and has an operating frequency; and
c) an electromagnetic band gap substrate positioned proximate the antenna, said electromagnetic band gap substrate having a reflection phase which is different from 180°
at said operation frequency of the antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to an RFID Tag and Antenna for use with an RFID tag and a method of radio frequency identification (RFID). The RFID Tag comprises a RFID chip 5 for storing data, an antenna 6 and an electromagnetic band gap substrate 12. The RFID chip 5 and the antenna 6 are mounted above the electromagnetic band gap substrate 12. The electromagnetic band gap substrate has a reflection phase which is different from 180° at the operation frequency of the antenna. The electromagnetic band gap substrate enables the RFID to operate even if it is mounted on a conductive object, as the reflection phase is not 180° so it does not destructively interfere with the radiation from the antenna at the operating frequency. Preferably the reflection phase is between 340° and 115° or −95° and 145°. The preferred embodiment uses a band gap substrate having two mushroom-like conductive layers 3, 7 with a dielectric in between.
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Citations
20 Claims
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1. An RFID tag comprising:
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a) an RFID chip for storing data; b) an antenna which is connected to the RFID chip and has an operating frequency; and c) an electromagnetic band gap substrate positioned proximate the antenna, said electromagnetic band gap substrate having a reflection phase which is different from 180°
at said operation frequency of the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An antenna system for use with an RFID tag, the system comprising an electromagnetic band gap substrate comprising a first conductive layer, a second conductive layer, a common conductive ground plate electrically connected to said first and second conductive layers and a dielectric between said first and second conductive layers and said second conductive layer and said ground plate;
- and an antenna mounted proximate the first conductive layer.
- View Dependent Claims (20)
Specification