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ib technology
A useful formula is given below for calculating the approximate number of turns
required to achieve a particular inductance.
1.9
N = (approx)
L
1.9
or L = 2 . A . ln(A / D). N
2 . A . ln(A / D)
-9
L = Required Inductance (nH) i.e H x 10
A = Antenna Circumference (cm) ie. π x diameter (cm)
D = Wire Diameter (cm) e.g 0.0236 cm
N = Approx number of windings
Example Antennas
A)
0.236mm diameter (34 swg) Enamelled Cu wire.
Antenna 14.5cm internal diameter, 45 turns.
Approx 750uH
Maximum range: approx 20cm with HT2 card transponders
B)
0.236mm diameter (34 swg) Enamelled Cu wire.
Antenna 10cm internal diameter, 55 turns.
Approx 750uH
Maximum range: approx 15cm with HT2 card transponders
C)
0.236mm diameter (34 swg) Enamelled Cu wire.
Antenna 7cm internal diameter, 67 turns.
Approx 750uH
Maximum range: approx 10-15cm with HT2 card transponders
Examples of antenna (C) and a very small antenna for applications with limited space
More information on the Micro RWD and other products can be found at the Internet web site:
http://www.ibtechnology.co.uk
Or alternatively contact IB Technology by email at:
sales@ibtechnology.co.uk
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