CA2214536A1 - Eas system with alternating on/off transmitter operation and loop antenna - Google Patents
Eas system with alternating on/off transmitter operation and loop antennaInfo
- Publication number
- CA2214536A1 CA2214536A1 CA002214536A CA2214536A CA2214536A1 CA 2214536 A1 CA2214536 A1 CA 2214536A1 CA 002214536 A CA002214536 A CA 002214536A CA 2214536 A CA2214536 A CA 2214536A CA 2214536 A1 CA2214536 A1 CA 2214536A1
- Authority
- CA
- Canada
- Prior art keywords
- loops
- eas system
- alternating
- loop antenna
- antennas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Near-Field Transmission Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
An EAS system in which a transmitter alternately drives first and second antennas with the same coded message signal in its entirety. The antennas, in turn, transmit first and second signals each containing the coded message signal into respective first and second partially overlapping parts of an interrogation zone. Also disclosed is an antenna structure comprised of a plurality of loops extending one after the other and successive ones of which are of opposite phase. One of the loops circumscribes an area which is smaller than each of the other loops to realize reduced coupling to adjacent structures.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/967,846 US5404147A (en) | 1992-10-28 | 1992-10-28 | EAS system loop antenna having three loops of different area |
US07/967,846 | 1992-10-28 | ||
CA002098898A CA2098898C (en) | 1992-10-28 | 1993-06-21 | Eas system with alternating on/off transmitter operation and loop antenna |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002098898A Division CA2098898C (en) | 1992-10-28 | 1993-06-21 | Eas system with alternating on/off transmitter operation and loop antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2214536A1 true CA2214536A1 (en) | 1994-04-29 |
CA2214536C CA2214536C (en) | 2001-04-03 |
Family
ID=25676304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002214536A Expired - Fee Related CA2214536C (en) | 1992-10-28 | 1993-06-21 | Eas system with alternating on/off transmitter operation and loop antenna |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2214536C (en) |
-
1993
- 1993-06-21 CA CA002214536A patent/CA2214536C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2214536C (en) | 2001-04-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |