OBID
®
Antenna Manual
ID RW24
FEIG ELECTRONIC GmbH
Seite 3 von 15
h80391-1e-ID.doc
Contents
:
1. General ............................................................................................................................... 4
1.1. Functional description of the OBID
®
-system........................................................................ 4
2. Basic factors...................................................................................................................... 5
2.1. Equivalent circuit diagram..................................................................................................... 5
2.2. Admissible antenna parameters for reader model ID RW24 ............................................... 5
2.3. Methods of manufacture........................................................................................................ 6
2.3.1. Coiled wire antenna ......................................................................................................... 6
2.3.2. Flat strip cable antenna.................................................................................................... 6
2.3.3. Transmission antenna ...................................................................................................... 6
2.3.4. Comparison...................................................................................................................... 7
3. Elementary antennas ........................................................................................................ 8
3.1. Simple frame antenna............................................................................................................ 8
3.2. 8-loop used as frame antenna............................................................................................. 10
4. Gate antennas.................................................................................................................. 11
4.1. Gate antenna in Helmholtz arrangement............................................................................ 11
4.2. Gate antenna in Anti-Helmholtz arrangement .................................................................... 12
4.3. Gate antenna in mixed arrangement .................................................................................. 13
5. Influences on the ID RW24-systems .............................................................................. 14
5.1. Mutual influence of two ID RW24-systems ......................................................................... 14
5.1.1. Mutual influence by carrier frequencies.......................................................................... 14
5.1.2. Mutual influence by transmission logs............................................................................ 14
