DUAL MICROSTRIP ANTENNA FOR RFID DEVICE
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Jun 4, 2015
app pub date -
Feb 4, 2015
filing date -
Dec 14, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Microstrip patch antenna (46), feed structure (48), and matching circuit (50) designs for an RFID tag (10) are disclosed. A balanced feed design using balanced feeds coupled by a shorting stub (56) creates a virtual short between the two feeds so as to eliminate the need for physically connecting the substrate to the ground plane. A dual feed structure design uses a four-terminal IC connected to two antennas (46a,46b) resonating at different frequencies to provide directional and polarization diversity. A combined near-field/far-field design using a microstrip antenna provides electromagnetic coupling for far-field operation, and a looping matching circuit provides inductive coupling for near-field operation. A dual-antenna design uses first and second microstrip antennas providing directional diversity when affixed to a cylindrical or conical object, and a protective superstrate (66) is applied. An annular antenna (46c) design for application to the top of a metal cylinder around a stem is disclosed.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully